Patent Application
20220403020
The Sequence Listing associated with this application is provided in text format in lieu of a paper copy, and is hereby incorporated by reference into the specification. The name of the text file containing the Sequence Listing is HOPA-025_06_US_SeqList_ST25.txt. The text file is 3,961 bytes, was created on Jun. 1, 2022, and is being submitted electronically via EFS-Web.
The present disclosure is related to methods of treating autoimmune disorders in a subject comprising administering immunoglobulin-like transcript 7 (ILT7) binding proteins to a subject having elevated type I interferon gene signature (IFNGS). The present disclosure is also relates to methods of reducing pDCs in tissues comprising administering an ILT7-binding protein to a subject in need thereof.
The type I interferon (IFN) axis is one of the most significant pathways in human disease, and its dysregulation is central to the pathogenesis of many chronic autoimmune diseases, such as systemic lupus erythematosus (SLE). Although the precise etiology of SLE and other autoimmune diseases is not fully resolved, it is believed that a combination of environmental and genetic factors, together with an accumulation of cellular debris, leads to a breakdown in peripheral immune tolerance, characterized by high levels of circulating autoreactive antibodies. Currently available methods are directed towards treating autoimmune diseases and not towards preventing such diseases. Further, conventional treatment options for autoimmune diseases include immunosuppressant drugs that are associated with a wide range of side effects. Thus, there is a need for prophylactic and better therapeutic alternatives for treating and preventing autoimmune diseases. The present disclosure addresses these needs.
In certain embodiments, the methods of the present disclosure can be used for reducing a type I interferon gene signature (IFNGS) in a subject in need thereof. The methods comprise administering to the subject a pharmaceutically effective amount of an immunoglobulin-like transcript 7 (ILT7)-binding protein. The ILT7 binding protein is administered to the subject when the type I IFNGS is elevated in the subject relative to the type I IFNGS in a normal subject. In a specific embodiment, the ILT7 binding protein may be administered to subjects with elevated baseline type I IFNGS relative to the type I IFNGS in a normal subject, these subjects are monitored for reduction of the type I IFNGS after treatment. The ILT7-binding protein binds to the same ILT7 epitope as an antibody comprising a heavy chain variable region (VH) of SEQ ID NO:1 and a light chain variable region (VL) of SEQ ID NO:2. In certain aspects, the subject is monitored for reduction of the type I IFNGS after treatment.
In certain aspects, the type I IFNGS is measured in a test biological sample taken from the subject. The test sample includes, but is not limited to, blood, sputum, saliva, skin cells, skin biopsy samples, kidney cells, lung cells, liver cells, heart cells, brain cells, nervous tissue, thyroid cells, eye cells, skeletal muscle cells, cartilage, bone tissue, and cultured cells.
In some aspects, the type I IFNGS is elevated by at least about 4-fold in the test biological sample relative to the normal biological sample. In certain aspects, the type I IFNGS comprises the collective expression levels of two or more type I interferon (IFN)-inducible genes. In some aspects, the two or more type I interferon (IFN)-inducible genes are selected from the group consisting of SPATS2L, EPSTI1, HERC5, IFI27, IFI44, IFI44L, IFI6, IFIT1, IFIT3, ISG15, LAMP3, LY6E, MX1, OAS1, OAS2, OAS3, PLSCR1, RSAD2, RTP4, SIGLEC1, and USP18. In certain aspects, the type I IFNGS comprises the collective expression levels of all of SPATS2L, EPSTI1, HERC5, IFI27, IFI44, IFI44L, IFI6, IFIT1, IFIT3, ISG15, LAMP3, LY6E, MX1, OAS1, OAS2, OAS3, PLSCR1, RSAD2, RTP4, SIGLEC1, and USP18.
In some aspects, the type I IFNGS is determined by assaying the mRNA levels of the two or more type I interferon (IFN)-inducible genes in the test biological sample. In particular aspects, the type I IFNGS is determined by assaying the mRNA levels of the 21 type I interferon (IFN)-inducible genes in the test biological sample.
In some aspects, administering the ILT7-binding protein causes a reduction in plasmacytoid dendritic cells (pDCs) in the subject. In certain aspects, the pDCs are circulating pDCs. In particular aspects, the reduction in the pDCs is reversible.
In some aspects, reducing the type I IFNGS treats an autoimmune disease in the subject. In certain aspects, the autoimmune disease is selected from the group consisting of systemic lupus erythematosus (SLE), lupus nephritis, cutaneous lupus erythematosus (CLE), Sjögren's syndrome, inflammatory myositis, such as dermatomyositis, inclusion body myositis, juvenile myositis and polymyositis, systemic sclerosis, diabetes, Hashimoto's disease, autoimmune adrenal insufficiency, pure red cell anemia, multiple sclerosis, rheumatic carditis, psoriasis, psoriatic arthritis, rheumatoid arthritis, chronic inflammation, chronic rheumatism, vitiligo, alopecia areata, hidradenitis suppurativa, celiac disease, acute and chronic graft versus host disease (GVHD), vascular inflammation, myocardial infarction, and Type-1 interferonopathies. In some aspects, the autoimmune disease is SLE or CLE. In other aspects, the autoimmune disease is Sjögren's syndrome. In yet other aspects, the autoimmune disease is dermatomyositis. In other aspects, the autoimmune disease is polymyositis. In yet other aspects, the autoimmune disease is systemic sclerosis. In still other aspects, the autoimmune disease is hidradenitis suppurativa. In other aspects, the autoimmune disease is vitiligo.
In some aspects, the ILT7-binding protein is an antibody comprising heavy chain Complementarity-Determining Regions (HCDRs) HCDR1, HDR2, HCDR3, and light chain Complementarity Determining Regions (LCDRs) LCDR1, LCDR2, and LCDR3 comprising the amino acid sequences of SEQ ID NOs: 3, 4, 5, 6, 7, and 8, respectively. In particular aspects, the ILT7 binding protein is an antibody comprising a variable heavy chain (VH) that is at least 85%, 90%, 95%, 96%, 97%, 98% or 99% identical to SEQ ID NO:1 and/or a variable light chain (VL) that is at least 85%, 90%, 95%, 96%, 97%, 98% or 99% identical to SEQ ID NO:2. In certain aspects, the ILT7-binding protein is an antibody comprising a heavy chain variable region (VH) of SEQ ID NO:1 and a light chain variable region (VL) of SEQ ID NO:2. In some aspects, the antibody is afucosylated.
In some aspects, the pharmaceutically effective amount of the ILT7-binding protein ranges from about 0.1 mg to about 1000 mg. In certain aspects, the pharmaceutically effective amount of the ILT7-binding protein is about 1 mg, about 5 mg, about 15 mg, about 50 mg, about 100 mg, or about 150 mg. In some aspects, the ILT7-binding protein is administered by subcutaneous injection.
In some aspects, administration of the ILT7-binding protein leads to at least about 50% reduction in the type I IFNGS in the subject, compared to the type I IFNGS prior to administration of the ILT7-binding protein. In certain aspects, the ILT7-binding protein induces antibody-dependent cell-mediated cytotoxicity (ADCC) activity against pDCs. In some aspects, the ILT7-binding protein suppresses release of type I interferon (IFN) from pDCs. In certain aspects, the type I IFN is IFNα. In some aspects, the ILT7-binding protein specifically binds to ILT7. In some aspects, the ILT7 is located on pDCs.
In other embodiments, the methods of the present disclosure can be used to monitor the effectiveness of treatment of conditions marked by activated pDCs. The methods comprise the steps of: (a) measuring a type I interferon gene signature (IFNGS) in a biological sample taken from the subject to obtain a baseline value of the type I IFNGS; and (b) measuring the type I IFNGS in a biological sample taken from the subject after administering a treatment, wherein the treatment comprises an immunoglobulin-like transcript 7 (ILT7)-binding protein. In some aspects a decrease in the type I IFNGS in step (b) compared to the baseline value indicates that the treatment is effective. The ILT7-binding protein binds to the same ILT7 epitope as an antibody comprising a heavy chain variable region (VH) of SEQ ID NO:1 and a light chain variable region (VL) of SEQ ID NO:2.
In additional embodiments, the methods of the present disclosure can be used for reducing plasmacytoid dendritic cells (pDCs) in a tissue of a subject in need thereof. The methods comprise administering to the subject a pharmaceutically effective amount of an immunoglobulin-like transcript 7 (ILT7)-binding protein. In certain aspects, the ILT7-binding protein is an antibody comprising heavy chain Complementarity-Determining Regions (HCDRs) HCDR1, HDR2, HCDR3, and light chain Complementarity Determining Regions (LCDRs) LCDR1, LCDR2, and LCDR3 comprising the amino acid sequences of SEQ ID NOs: 3, 4, 5, 6, 7, and 8, respectively.
In some aspects, the tissue is selected from the group consisting of skin cells, skin biopsy samples, kidney cells, lung cells, liver cells, heart cells, brain cells, nervous tissue, thyroid cells, eye cells, skeletal muscle cells, cartilage, bone tissue, and cells from airway passages. In certain aspects, the tissue is a skin cell. In some aspects, the tissue is a skin biopsy sample.
In some aspects, the method results in a decrease in pDCs in the tissue compared to a baseline value. In certain aspects, the decrease in pDCs in the tissue compared to the baseline value ranges from about 1% to about 99%. In some aspects, the decrease in pDCs in the tissue compared to the baseline value is at least about 50%.
In some aspects, the ILT7-binding protein is an antibody comprising heavy chain Complementarity-Determining Regions (HCDRs) HCDR1, HDR2, HCDR3, and light chain Complementarity Determining Regions (LCDRs) LCDR1, LCDR2, and LCDR3 comprising the amino acid sequences of SEQ ID NOs: 3, 4, 5, 6, 7, and 8, respectively.
In further embodiments, the methods of the present disclosure can be used for treating an autoimmune disorder in a subject in need thereof. The methods comprise administering to the subject a pharmaceutically effective amount of an immunoglobulin-like transcript 7 (ILT7)-binding protein. In some aspects, the pharmaceutically effective amount of the ILT7-binding protein is about 1 mg, about 5 mg, about 15 mg, about 50 mg, about 100 mg, or about 150 mg. In some aspects, the pharmaceutically effective amount of the ILT7-binding protein is about 50 mg. In certain aspects, the pharmaceutically effective amount of the ILT7-binding protein is about 150 mg.
In certain embodiments, the methods of the present disclosure can be used for treating an autoimmune disorder in a subject in need thereof, the methods comprising administering to the subject a pharmaceutically effective amount of an immunoglobulin-like transcript 7 (ILT7)-binding protein, wherein the pharmaceutically effective amount of the ILT7-binding protein is about 50 mg.
In other embodiments, the methods of the present disclosure can be used for treating an autoimmune disorder in a subject in need thereof, the methods comprising administering to the subject a pharmaceutically effective amount of an immunoglobulin-like transcript 7 (ILT7)-binding protein, wherein the pharmaceutically effective amount of the ILT7-binding protein is about 150 mg.
In additional embodiments, the methods of the present disclosure can be used for reducing plasmacytoid dendritic cells (pDCs) in a tissue of a subject in need thereof, the method comprising administering to the subject a pharmaceutically effective amount of an immunoglobulin-like transcript 7 (ILT7)-binding protein. The pharmaceutically effective amount of the ILT7-binding protein is about 50 mg.
In further embodiments, the methods of the present disclosure can be used for reducing plasmacytoid dendritic cells (pDCs) in a tissue of a subject in need thereof, the method comprising administering to the subject a pharmaceutically effective amount of an immunoglobulin-like transcript 7 (ILT7)-binding protein. The pharmaceutically effective amount of the ILT7-binding protein is about 150 mg.
In some aspects, the decrease in pDCs in the tissue compared to the baseline value ranges from about 1% to about 99%. In certain aspects, the decrease in pDCs in the tissue compared to the baseline value is at least about 50%.
In some aspects, the subject has a high blood type I IFNGS level prior to administration of the ILT7-binding protein. In particular aspects, subject has a high pDC level in a tissue biopsy prior to administration of the ILT7-binding protein.
In some aspects, the autoimmune disease is systemic lupus erythematosus (SLE), lupus nephritis, cutaneous lupus erythematosus (CLE), Sjögren's syndrome, inflammatory myositis, such as dermatomyositis, inclusion body myositis, juvenile myositis and polymyositis, systemic sclerosis, diabetes, Hashimoto's disease, autoimmune adrenal insufficiency, pure red cell anemia, multiple sclerosis, rheumatic carditis, psoriasis, psoriatic arthritis, rheumatoid arthritis, chronic inflammation, chronic rheumatism, vitiligo, alopecia areata, hidradenitis suppurativa, celiac disease, acute and chronic graft versus host disease (GVHD), vascular inflammation, myocardial infarction, and Type-1 interferonopathies. In some aspects, the autoimmune disease is SLE. In other aspects, the autoimmune disease is CLE. In some aspects, the autoimmune disease is lupus. In certain aspects, the subject does not have discoid lupus erythematosus (DLE).
In some embodiments, the methods of the present disclosure can be used for selecting a patient for treatment with an ILT7-binding protein, the method comprising: (i) determining the baseline blood type I IFNGS level of the patient, and (ii) selecting those patients with high baseline blood type I IFNGS levels for treatment with the ILT7-binding protein.
In certain embodiments, the methods of the present disclosure are directed to treating an autoimmune disorder in a subject in need thereof, the method comprising administering to the subject a pharmaceutically effective amount of an immunoglobulin-like transcript 7 (ILT7)-binding protein, wherein the subject is determined to have a high blood type I IFNGS level prior to administration of the ILT7-binding protein. In some aspects, the ILT7-binding protein is an antibody comprising heavy chain Complementarity-Determining Regions (HCDRs) HCDR1, HDR2, HCDR3, and light chain Complementarity Determining Regions (LCDRs) LCDR1, LCDR2, and LCDR3 comprising the amino acid sequences of SEQ ID NOs: 3, 4, 5, 6, 7, and 8, respectively. In some aspects, the ILT7 binding protein is an antibody comprising a variable heavy chain (VH) that is at least 85%, 90%, 95%, 96%, 97%, 98% or 99% identical to SEQ ID NO:1 and/or a variable light chain (VL) that is at least 85%, 90%, 95%, 96%, 97%, 98% or 99% identical to SEQ ID NO:2. In certain aspects, the ILT7-binding protein is an antibody comprising a heavy chain variable region (VH) of SEQ ID NO:1 and a light chain variable region (VL) of SEQ ID NO:2. In some aspects, the antibody is afucosylated.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the subject matter pertains. All publications, patent applications, patents, and other references mentioned herein are expressly incorporated by reference in their entirety. In cases of conflict, the present specification, including definitions, will control. In addition, the materials, methods, and examples described herein are illustrative only and are not intended to be limiting.
As used in this specification and the appended claims, the singular forms “a,” “an” and “the” include plural referents unless the context clearly dictates otherwise.
Ranges can be expressed herein as from “about” one particular value, and/or to “about” another particular value. When such a range is expressed, another embodiment includes from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent “about,” it will be understood that the particular value forms another embodiment. It will be further understood that the endpoints of each of the ranges are significant both in relation to the other endpoint, and independently of the other endpoint. The term “about” as used herein refers to a range that is 15% plus or minus from a stated numerical value within the context of the particular usage. For example, about 10 would include a range from 8.5 to 11.5. The term “about” also accounts for typical error or imprecision in measurement of values.
The disclosure provides methods for of treating an autoimmune disorder in a subject with an ILT7-binding protein. In certain aspects, the methods provide treating an autoimmune disorder in a subject in need thereof, wherein the subject is determined to have a high blood type I interferon gene signature (IFNGS) level. The disclosure also provides methods for reducing the IFNGS in a subject in need thereof. In some aspects, the methods comprise administering to the subject a pharmaceutically effective amount of an immunoglobulin-like transcript 7 (ILT7)-binding protein. In some aspects, the ILT7 binding protein is administered to the subject when the type I IFNGS is elevated in the subject relative to the type I IFNGS in a normal subject. In specific embodiments, for example, the ILT7 binding protein is administered to subjects with elevated baseline type I IFNGS relative to the type I IFNGS in a normal subject. In certain aspects, the methods provide selecting a patient for treatment with an ILT7-binding protein, the method comprising: (i) determining the baseline blood type I IFNGS level of the patient, and (ii) selecting those patients with high baseline blood type I IFNGS levels for treatment with the ILT7-binding protein. In particular aspects, the ILT7-binding protein is an antibody. In certain aspects, the antibody is VIB7734.
In certain embodiments, the type I IFNGS is a 21-gene signature. In some embodiments, the type I IFNGS in the subject is at elevated by at least 1.5-fold relative to a normal score prior to treatment. In some embodiments, the type I IFNGS in the subject is at elevated by at least 2-fold relative to a normal score prior to treatment. In certain embodiments, subjects with elevated type I IFNGS prior to treatment are more responsive to the treatment. In some embodiments, type I IFNGS is at least about 4-fold, at least about 5-fold, at least about 6-fold, at least about 7-fold, at least about 8-fold, at least about 9-fold, at least about 10-fold, at least about 11-fold, at least about 12-fold or higher relative to a normal score prior to treatment with an ILT7-binding protein used in the methods described herein. In particular embodiments, the tissue type I IFNGS is determined from a skin biopsy. In other embodiments, the tissue type I IFNGS is determined using the IFN-inducible Myxovirus protein A (MxA) immunohistochemistry (IHC) test. In further embodiments, the IFN-inducible gene expression in the epidermis is determined using skin tape stripping, RNA isolation and gene expression profiling (https://dermtech.com/wp-content/uploads/Lupus-Reference.pdf).
As used herein, the term “high” or “elevated” when used in conjunction with IFGNS means that the type I IFNGS is a fold change of at least about 1.1 to about 1000 compared to normal type I IFNGS. By “normal type I IFNGS” is intended a type I IFNGS obtained from a normal subject. The terms “high” or “elevated” when used in conjunction with type I IFNGS are used interchangeably. In some embodiments, the type I IFNGS is “high” or “elevated” when the type I IFNGS used in the methods described herein is at least about 1.1, 1.2, 1.3, 1.4, 1.5, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 30, 40, 50, 60, 70, 80, 90, or 100-fold relative to the type I IFNGS in a normal subject. In specific embodiments, the methods of treatment described herein are applied when type I IFNGS is elevated by at least about 4-fold relative to normal type I IFNGS.
In certain diseases (e.g., autoimmune diseases), activated pDCs secrete significant amounts of type I and type III interferons (IFNs). Type I IFNs are a large group of IFN proteins that help regulate the immune system. The mammalian IFNs are designated IFNα, IFNβ, IFNω, IFNε, IFNκ, IFNτ, IFNδ, IFNζ, and IFNν. In specific embodiments, the type I IFN that generates the type I IFNGS is IFNα. Type I IFN protein levels cannot be directly measured in a reliable way; however, measurement of IFN-inducible genes serves as a robust surrogate to Type 1 IFN protein levels. The expression levels of these type I IFN-inducible genes can be measured in biological samples (e.g., blood, skin, skeletal muscles, etc.) and analyzed as a composite outcome referred to as the “type I interferon gene signature” or “type I IFNGS” or “IFNGS.”
In certain embodiments, the type I IFNGS comprises expression levels of all type I IFN-inducible genes in a biological sample. In other embodiments, the type I IFNGS comprises expression levels of a subset of type I IFN-inducible genes in a biological sample.
In certain embodiments, the type I IFNGS is determined by assaying the expression levels of at least 2, at least 5, at least 10, at least 15, at least 20, at least 25, at least 30, at least 40, at least 50, at least 60, at least 70, at least 80, at least 90, at least 100, at least 200, at least 300, at least 400, or at least 500 type I IFN-inducible genes in a biological sample. In some embodiments, the type I IFNGS comprises the collective expression levels of two or more type I IFN-inducible genes. In certain embodiments, the two or more type I interferon (IFN)-inducible genes include, but are not limited to, two or more genes chosen from SPATS2L, EPSTI1, HERC5, IFI27, IFI44, IFI44L, IFI6, IFIT1, IFIT3, ISG15, LAMP3, LY6E, MX1, OAS1, OAS2, OAS3, PLSCR1, RSAD2, RTP4, SIGLEC1, or USP18. In certain cases, the type I IFNGS is determined by assaying the collective expression levels of SPATS2L, EPSTI1, HERC5, IFI27, IFI44, IFI44L, IFI6, IFIT1, IFIT3, ISG15, LAMP3, LY6E, MX1, OAS1, OAS2, OAS3, PLSCR1, RSAD2, RTP4, SIGLEC1, and USP18. These gene symbols are well-known in the art and refer to human and non-human orthologs of the listed genes.
In certain embodiments, the expression levels of the type I interferon (IFN)-inducible genes are determined by measuring the DNA levels (e.g., complementary DNA or cDNA levels) of the type I interferon (IFN)-inducible genes in a biological sample. In certain embodiments, the expression levels of the type I interferon (IFN)-inducible genes are determined by measuring the messenger RNA (mRNA) levels of the type I interferon (IFN)-inducible genes in a biological sample. In certain aspects, the type I IFNGS comprises mRNA levels of all type I IFN-inducible genes in the biological sample. In other aspects, the type I IFNGS comprises mRNA levels of a subset of type I IFN-inducible genes in the biological sample taken from a subject affected, likely to be affected, or suspected to be affected with a disease, e.g., an autoimmune disease. In certain aspects, the type I IFNGS is determined by assaying the mRNA levels of the two or more type I interferon (IFN)-inducible genes in a biological sample. In specific aspects, the type I IFNGS is determined by assaying the mRNA levels of the 21 type I interferon (IFN)-inducible genes in a biological sample. In certain embodiments, the biological sample is a test biological sample. In other embodiments, the biological sample is a normal biological sample.
In certain aspects, the type I IFNGS is measured in test biological samples taken from the subject. In other aspects, the pDCs are measured in test biological samples taken from the subject. The biological sample includes, but is not limited to, blood, sputum, saliva, skin cells, skin biopsy samples, kidney cells, lung cells, liver cells, heart cells, brain cells, nervous tissue, thyroid cells, eye cells, skeletal muscle cells, cartilage, bone tissue, cells from airway passages, and cultured cells. In certain embodiments, the biological sample is blood. In other embodiments, the biological sample is tissue. In more specific embodiments, the sample is a tissue comprising skin cells. In other aspects, the sample is a skin biopsy sample.
By “test biological sample” is intended any biological sample obtained from an individual affected, likely to be affected, or suspected to be affected with a disease or condition such as an autoimmune disorder and/or from an individual exhibiting one or more symptoms thereof, such as but not limited to elevated type I IFNGS.
By “normal biological sample” is intended any biological sample obtained from a normal subject.
As used herein, the term “subject” refers to any individual, e.g., a human or a non-human mammal, for whom diagnosis, prognosis, or therapy is desired. The term “subject” may mean a human or non-human mammal affected, likely to be affected, or suspected to be affected with a disease, e.g., an autoimmune disease or condition. The terms “subject” and “patient” are used interchangeably herein. Although the ILT7-binding protein compositions provided herein are principally directed to compositions which are suitable for administration to humans, the skilled artisan will understand that such compositions are generally suitable for administration to subjects of all sorts. In certain aspects, the subject is a mammal. A mammal includes primates, such as humans, monkeys, chimpanzee, and apes, and non-primates such as domestic animals, including laboratory animals (such as rabbits and rodents, e.g., guinea pig, rat, or mouse) and household pets and farm animals (e.g., cats, dogs, swine, cattle, sheep, goats, horses, rabbits), and non-domestic animals, such as wildlife, birds, reptile; fish, or the like.
As used herein, the term “a subject in need thereof” includes subjects that could or would benefit from the methods described herein. Subjects in need of treatment include, without limitation, those already with the condition or disorder, those prone to having the condition or disorder, those in which the condition or disorder is suspected, as well as those in which the condition or disorder is to be prevented, ameliorated, or reversed.
As used herein, the term “normal subject” refers to any healthy individual, e.g., a human or a non-human mammal, not affected with any disease or suspected of being affected with a disease or condition. The term “normal subject” also refers to an individual e.g., a human or a non-human mammal, prior to exhibiting any symptoms associated with an autoimmune disorder, such as elevated type I IFNGS. The normal subject can be the same subject as the subject in need of treatment, prior to the subject exhibiting any symptoms of an autoimmune disorder, such as but not limited to elevated type I IFNGS. In other embodiments, the normal subject and the subject in need of treatment are two different individuals.
The disclosure provides methods of treating a subject with elevated type I IFNGS comprising administering the ILT7 binding proteins described herein. Patients may exhibit an elevated type I IFNGS when suffering from an autoimmune disorder. Accordingly, the present disclosure provides methods of treating an autoimmune disorder when the subject is exhibiting an elevated type I IFNGS. In some embodiments, the autoimmune disorder is otherwise asymptomatic. In certain aspects, the methods provide selecting a patient for treatment with an ILT7-binding protein, the method comprising: (i) determining the baseline blood type I IFNGS level of the patient, and (ii) selecting those patients with high baseline blood type I IFNGS levels for treatment with the ILT7-binding protein.
As used herein, “treating” or “treat” describes the management and care of a subject for the purpose of combating a disease, condition, or disorder and includes the administration of an ILT7-binding protein used in the methods described herein to alleviate the symptoms or complications of a disease, condition or disorder, or to eliminate the disease, condition or disorder. Thus, the term “treat” or “treating” refers to both therapeutic measures and prophylactic or preventative measures, wherein the objective is to prevent, slow down (lessen), or ameliorate the progression of a disease (e.g., an autoimmune disease). Beneficial or desired clinical results include, but are not limited to, alleviation of symptoms, diminishing the extent of the disease, stabilized (i.e., not worsening) state of the disease, delaying or slowing of disease progression, amelioration or palliation of the disease state, and reversing the disease (whether partial or total). The term “treat” can also include treatment of a cell in vitro or an animal model.
In some embodiments, treatment includes the application or administration of the ILT7-binding protein used in the methods described herein to a subject in need thereof or to a subject that is suspected of needing treatment thereof, or application or administration of the ILT7-binding protein used in the methods described herein to an isolated tissue or cell line from a subject, where the subject has a disease, a symptom of a disease, or a predisposition toward a disease (e.g., an autoimmune disease). A subject may be suspected of needing the treatments described herein when the subject is exhibiting symptoms of a condition or disease by excess pDC numbers or activity, even though a formal diagnosis, e.g., the subject has SLE or CLE, has not been ascertained. In certain aspects, the subject suspected of needing treating has a high baseline blood type I IFNGS level. In other embodiments, treatment is also intended to include the application or administration of a pharmaceutical composition comprising a ILT7-binding protein used in the methods described herein to a subject in need thereof or to a subject that is suspected of needing treatment thereof, or application, or administration of a pharmaceutical composition comprising a ILT7-binding protein used in the methods described herein to an isolated tissue or cell line from a subject who has a disease, a symptom of a disease, or a predisposition toward a disease (e.g., an autoimmune disease).
Examples of autoimmune disorders that may be treated when the subject is exhibiting elevated type I IFNGS include but are not limited to systemic lupus erythematosus (SLE), lupus nephritis, cutaneous lupus erythematosus (CLE), Sjögren's syndrome, inflammatory myositis, such as dermatomyositis, inclusion body myositis, juvenile myositis and polymyositis, systemic sclerosis, diabetes, Hashimoto's disease, autoimmune adrenal insufficiency, pure red cell anemia, multiple sclerosis, rheumatic carditis, psoriasis, psoriatic arthritis, rheumatoid arthritis, chronic inflammation, chronic rheumatism, vitiligo, alopecia areata, hidradenitis suppurativa, celiac disease, acute and chronic graft versus host disease (GVHD), vascular inflammation, myocardial infarction, and Type-1 interferonopathies. In certain aspects, the autoimmune disease is SLE. In further aspects, the autoimmune disease is CLE. In certain aspects, the autoimmune disease is lupus, but is not discoid lupus erythematosus (DLE). In other aspects, the autoimmune disease is Sjögren's syndrome. In additional aspects, the autoimmune disease is dermatomyositis. In yet other aspects, the autoimmune disease is polymyositis. In still other aspects, the autoimmune disease is systemic sclerosis. In further other aspects, the autoimmune disease is hidradenitis suppurativa. In still further other aspects, the autoimmune disease is vitiligo.
In still more embodiments, the methods of the present disclosure can be used to monitor the effectiveness of treatment of conditions or disorders by monitoring levels of type I IFNGS and/or activated pDCs. As noted above, autoimmune conditions are often marked by elevated type I IFNGS and/or elevated pDCs, thus monitoring the effectiveness of treatments can include monitoring type I IFNGS and/or pDC levels.
Thus, in certain embodiments, the disclosure provides a method of monitoring effectiveness of treatment of an autoimmune disorder or condition, comprising the steps of: (a) measuring a type I interferon gene signature (IFNGS) in a biological sample taken from the subject to obtain a baseline value of the type I IFNGS; and (b) measuring the type I IFNGS in a biological sample taken from the subject after administering a treatment, wherein the treatment comprises administering an ILT7-binding protein, and wherein a decrease in the type I IFNGS in step (b) compared to the baseline value indicates that the treatment is effective in the subject.
In certain embodiments, the treatment results in a decrease in the type I IFNGS compared to the baseline value. In certain embodiments, the decrease in the type I IFNGS compared to the baseline value ranges from about 1% to about 99%. In certain aspects, the decrease in the type I IFNGS compared to the baseline value is at least about 5%, at least about 10%, at least about 20%, at least about 30%, at least about 40%, at least about 50%, at least about 60%, at least about 70%, at least about 80%, at least about 90%, at least about 95%, or at least about 99%. In some aspects, the decrease in the type I IFNGS compared to the baseline value is at least about 30%. In specific aspects, the decrease in the type I IFNGS compared to the baseline value is at least about 50%.
In certain embodiments, the elevation in type I IFNGS in a test biological sample relative to a normal biological sample, or in a subject in need of treatment with an ILT7 binding protein relative to a normal subject is at least a fold change of about 1.1 to about 1000. Thus, in some embodiments, the type I IFNGS is elevated by at least about 1.1, 1.2, 1.3, 1.4, 1.5, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 30, 40, 50, 60, 70, 80, 90, or 100-fold in a test biological sample relative to a normal biological sample, or in a subject in need of treatment with an ILT7 binding protein relative to a normal subject. In specific embodiments, the type I IFNGS is elevated by at least about 4-fold in the test biological sample relative to the normal biological sample, or in a subject in need of treatment with an ILT7 binding protein relative to a normal subject.
Generally, the terms “ILT7-binding protein,” “ILT7-binding molecule,” and “ILT7-binding protein used in the methods described herein” are used interchangeably to refer to a protein or molecule that specifically binds to immunoglobulin-like transcript 7 (ILT7). The terms protein and peptide can be used interchangeably herein. In some embodiments, the ILT7-binding proteins used in the methods described herein bind to full-length ILT7. In other embodiments, the ILT7-binding proteins used in the methods described herein bind to a fragment of ILT7. In certain aspects, the fragment of ILT7 to which the ILT7 binding proteins bind comprises the extracellular domain of ILT7.
In certain embodiments, the ILT7-binding proteins used in the methods disclosed herein bind to any mammalian ILT7. In specific aspects, the ILT7-binding proteins used in the methods disclosed herein bind to human ILT7 or a fragment thereof, for example the extracellular portion of human ILT7. In other aspects, the ILT7-binding proteins used in the methods disclosed herein bind to cynomolgus ILT7 or a fragment thereof, for example the extracellular portion of cynomolgus ILT7.
Examples of ILT7-binding proteins are disclosed and described in PCT Publication No. WO 2017/156298, which is incorporated by reference herein in its entirety. In certain aspects, the ILT7 to which the IL7T binding protein binds is located on pDCs. In specific embodiments, the ILT7-binding protein is VIB7734 antibody or a fragment thereof. VIB7734 is described in PCT Publication No. WO 2017/156298, which is incorporated by reference in its entirety. Specifically, VIB7734 is identified as clone ILT70137 in PCT Publication No. WO 2017/156298. In another embodiment, VIB7734 is also an antibody comprising a heavy chain variable region (VH) of SEQ ID NO:1 and a light chain variable region (VL) of SEQ ID NO:2.
In certain embodiments, the ILT7-binding proteins used in the methods described herein comprise a heavy chain variable region (VH) of SEQ ID NO:1. In other embodiments, the ILT7-binding proteins used in the methods described herein comprise a light chain variable region (VL) of SEQ ID NO:2. In certain aspects, the ILT7-binding proteins used in the methods described herein comprise a heavy chain variable region (VH) of SEQ ID NO:1 and a light chain variable region (VL) of SEQ ID NO:2. In other aspects, the ILT7-binding proteins used in the methods described herein comprise a VH that is at least 85%, 90%, 95%, 96%, 97%, 98% or 99% identical to SEQ ID NO:1 and/or a VL that is at least 85%, 90%, 95%, 96%, 97%, 98% or 99% identical to SEQ ID NO:2.
In more specific embodiments, the ILT7-binding proteins used in the methods described herein comprise heavy chain Complementarity-Determining Regions (HCDRs), HCDR1, HDR2, HCDR3, and light chain Complementarity Determining Regions (LCDRs), LCDR1, LCDR2, and LCDR3 having the amino acid sequences of SEQ ID NOs: 3, 4, 5, 6, 7, and 8, respectively. In other aspects, the ILT7-binding proteins used in the methods described herein comprise heavy chain Complementarity-Determining Regions (HCDRs), HCDR1, HDR2, HCDR3, and light chain Complementarity Determining Regions (LCDRs), LCDR1, LCDR2, and LCDR3, that are at least 85%, 90%, 95%, 96%, 97%, 98% or 99% identical to SEQ ID NOs: 3, 4, 5, 6, 7, and 8, respectively.
In certain embodiments, the ILT7-binding proteins used in the methods described herein may contain fucose moieties or they may be afucosylated.
Without having to be bound by theory, the ILT7-binding proteins used in the methods described herein induce antibody-dependent cell-mediated cytotoxicity (ADCC) activity against plasmacytoid dendritic cells (pDCs), thereby depleting pDCs. In certain aspects, ILT7-binding protein-mediated ADCC causes a reduction in circulating pDCs. In certain aspects, ILT7-binding protein-mediated ADCC causes a reduction in local or tissue pDCs. In certain embodiments, the tissue in which the pDCS are reduced includes, but is not limited to, skin cells, skin biopsy samples, kidney cells, lung cells, liver cells, heart cells, brain cells, nervous tissue, thyroid cells, eye cells, skeletal muscle cells, cartilage, bone tissue, and cells from airway passages. In some aspects, the tissue is a skin biopsy sample. In more specific aspects, administering the ILT7-binding proteins will cause a reduction in skin pDCs.
Normally, pDCs are not present in skin tissue, and immature pDCs are typically only found in blood, thymus lymphoid tissue, tonsils and lung tissue. Thus the presence of pDCs in skin biopsy samples is indicative of an abnormal condition in which pDCs are recruited to the skin. Accordingly, the methods of the present disclosure include administering an ILT7-binding protein to a subject in need of treatment of a condition marked by the presence of pDCs in the subject's skin. The methods of the present disclosure include reducing the levels of pDCs in a subject's skin by administering an ILT7-binding protein to the subject in need of treatment thereof.
In some embodiments, subjects have an elevated or high level of pDCs in skin tissue prior to treatment. In certain embodiments, subjects with a high pDC level in skin tissue prior to treatment are more responsive to the treatment. In certain aspects, the subjects with a high pDC level in skin tissue have a pDC level of at least about 50 pDC/mm2 of skin tissue, at least about 60 pDC/mm2 of skin tissue, at least about 70 pDC/mm2 of skin tissue, at least about 80 pDC/mm2 of skin tissue, at least about 90 pDC/mm2 of skin tissue, at least about 100 pDC/mm2 of skin tissue, at least about 110 pDC/mm2 of skin tissue, at least about 120 pDC/mm2 of skin tissue, at least about 125 pDC/mm2 of skin tissue, at least about 150 pDC/mm2 of skin tissue, at least about 175 pDC/mm2 of skin tissue, at least about 200 pDC/mm2 of skin tissue, or higher. In certain embodiments, a low pDC level in skin tissue is considered less than about 10 pDC/mm2 of skin tissue. In specific embodiments a high pDC level in skin tissue is considered at least about 100 pDC/mm2 of skin tissue.
In other embodiments, the methods of the present disclosure comprise administering an ILT7-binding proteins used in the methods described herein to suppress release of type I IFN from pDCs, regardless of the location of the pDCs. In other embodiments, the methods of the present disclosure comprise administering an ILT7-binding protein to suppress release of type I IFN from pDCs in the blood or circulation. In other embodiments, the methods of the present disclosure comprise administering an ILT7-binding protein to suppress release of type I IFN from local pDCs. In other embodiments, the methods of the present disclosure comprise administering an ILT7-binding protein to suppress release of type I IFN from pDCs in the skin of the subject. In certain embodiments, the type I IFN that suppressed in its release is IFNα. In certain aspects, ILT7-binding protein-mediated suppression of release of type I IFN from pDCs causes a reduction in type I IFNGS.
The term “reduce,” “reducing,” or “reduction” means to diminish in extent, level, amount, activity, or degree compared to an initial value. The reduction need not be statistically significant from one value over the next.
The terms “administer,” “administration,” “administering” and the like, as they apply to, for example, a subject, cell, tissue, organ, or biological sample, refer to contact of a compound or reagent to the subject, cell, tissue, organ, or biological sample. In the context of a cell, administration includes contact (e.g., in vitro or ex vivo) of a reagent to the cell, as well as contact of a reagent to a fluid, where the fluid is in contact with the cell. The ILT7-binding proteins used in the method described herein may be administered to a subject via a variety of routes known in the art. Exemplary routes of administering of the ILT7-binding proteins used in the methods described herein include, but are not limited to, parenteral, oral, mucosal, topical, transdermal, inhalation, sublingual, buccal, rectal, vaginal, and intranasal. The term parenteral, as used herein, includes subcutaneous injections, intravenous, intramuscular, intrasternal injection or infusion techniques. In certain aspects, the ILT7-binding proteins used in the methods described herein are administered intravenously. In specific aspects, the ILT7-binding proteins used in the methods described herein are administered by subcutaneous injection. The term “administer,” “administration,” or “administering” may involve a single administration or multiple administrations of an ILT7-binding protein used in the methods described herein. For example, multiple administration involves at least two (i.e., 2, 3, 4, 5, 6, 7, 8, 9, 10, or more) administrations to a subject of an ILT7-binding protein used in the methods described herein.
A “therapeutically effective amount,” or “pharmaceutically effective amount,” or “effective amount” of a compound (e.g., an ILT7-binding protein used in the methods described herein) refers to an amount that is sufficient to produce a desired prophylactic, therapeutic or ameliorative response in a subject, or an amount that is sufficient to result in prevention or amelioration of one or more symptoms of a disease or condition in a statistically significant manner. When referring to an individual active ingredient administered alone, a therapeutically effective dose refers to that ingredient alone. When referring to a combination, a therapeutically effective dose refers to combined amounts of the active ingredients that result in the therapeutic effect, whether administered serially or simultaneously. As used herein, the term “therapeutically effective amount” means that the ILT7-binding proteins used in the methods described herein are able to exert a medically beneficial effect (e.g., cause a reduction in an elevated type I IFNGS and/or reduction in pDCs in a subject in need thereof) when used as prescribed or directed, as compared to a placebo. The therapeutically effective amount will vary depending upon the species and weight of the subject to be administered, but may be ascertained using standard techniques. In certain embodiments, a therapeutically effective amount of an ILT7-binding protein used in the methods described herein ranges from about 0.1 mg to about 1000 mg. In other embodiments, a therapeutically effective amount of an ILT7-binding protein used in the methods described herein ranges from about 50 mg to about 150 mg. In certain aspects, a therapeutically effective amount of an ILT7-binding protein used in the methods described herein includes, but is not limited to, about 1 mg, about 5 mg, about 15 mg, about 50 mg, about 100 mg, about 150 mg, about 300 mg, about 500 mg, or about 1000 mg. In certain embodiments, a therapeutically effective amount of an ILT7-binding protein used in the methods described herein is about 5 mg in a single dose. In other embodiments, a therapeutically effective amount of an ILT7-binding protein used in the methods described herein is about 50 mg in a single dose. In yet other embodiments, a therapeutically effective amount of an ILT7-binding protein used in the methods described herein is about 150 mg in a single dose. A therapeutically effective amount of an ILT7-binding protein used in the methods described herein may be administered to a subject in need thereof in a single dose or in multiple doses.
In certain embodiments, administration of a therapeutically effective amount of an ILT7-binding protein used in the methods described herein to a subject in need thereof leads to about 1% to about 100% reduction in type I IFNGS in the subject compared to the type I IFNGS prior to administration of the ILT7-binding protein used in the methods described herein. In certain aspects, administration of a therapeutically effective amount of an ILT7-binding protein used in the methods described herein to a subject in need thereof leads to at least about 1%, at least about 2%, at least about 5%, at least about 10%, at least about 20%, at least about 30%, at least about 30%, at least about 40%, at least about 50%, at least about 60%, at least about 70%, at least about 80%, at least about 90%, at least about 95%, at least about 96%, at least about 97%, at least about 98%, at least about 99%, or about 100% reduction in type I IFNGS in the subject, compared to the type I IFNGS prior to administration of the ILT7-binding protein used in the methods described herein. In specific embodiments, administration of a therapeutically effective amount of the ILT7-binding protein leads to at least about 50% reduction in the type I IFNGS in the subject.
In certain embodiments, administration of the ILT7-binding protein used in the methods described herein to a subject in need thereof leads to at least about 50% reduction in the type I IFNGS in the subject, compared to the type I IFNGS prior to administration of the ILT7-binding protein used in the methods described herein. In certain aspects, administration of a therapeutically effective amount of an ILT7-binding protein used in the methods described herein to a subject in need thereof leads to the at least about 50% reduction in type I IFNGS in the subject at about 8 hours, about 12 hours, about 24 hours, or about 48 hours following administration of the ILT7-binding protein.
In specific embodiments, a subject who has been administered a therapeutically effective amount of an ILT7-binding protein used in the methods described herein shows a reduction in type I IFNGS of at least about 50% at about 24 hours following administration of the ILT7-binding protein, compared to the type I IFNGS in the subject prior to administration of the ILT7-binding protein.
In certain embodiments, the reduction in type I IFNGS persists for at least about 1 day, at least about 2 days, at least about 3 days, at least about 4 days, at least about 5 days, at least about 6 days, at least about 7 days, at least about 14 days, at least about 21 days, at least about 28 days, at least about 30 days, at least about 45 days, at least about 60 days, at least about 90 days, or at least about 180 days or longer following administration of a therapeutically effective amount of an ILT7-binding protein used in the methods described herein to a subject in need thereof. In some aspects, the reduction in type I IFNGS persists for up to about 30 days following administration of a therapeutically effective amount of an ILT7-binding protein used in the methods described herein to a subject in need thereof. In additional aspects, the reduction in type I IFNGS persists for up to about 60 days following administration of a therapeutically effective amount of an ILT7-binding protein used in the methods described herein to a subject in need thereof. Therefore, in some embodiments, a therapeutically effective amount of an ILT7-binding protein used in the methods described herein is administered to a subject in need thereof at least once every month. In other embodiments, a therapeutically effective amount of an ILT7-binding protein used in the methods described herein is administered to the subject at least once about every 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32,33, 34,3 5, 36, 37, 38 39, 40, 41, 42,43, 44, 45, 46, 47, 48, 49, 50, 51, or 52 weeks. In some embodiments, a therapeutically effective amount of an ILT7-binding protein used in the methods described herein is administered to the subject at least once every 4 weeks. In additional embodiments, a therapeutically effective amount of an ILT7-binding protein used in the methods described herein is administered to the subject at least once every 8 weeks or at least once every 12 weeks. In further embodiments, a therapeutically effective amount of an ILT7-binding protein used in the methods described herein is administered to the subject at least once every two or three months. In still further embodiments, a therapeutically effective amount of an ILT7-binding protein used in the methods described herein is administered to the subject at least once every year or at least once every 2 years.
As used herein, the term “reduction in pDCs” or “reducing pDCs” refers to diminished levels of activated pDCs in a subject or in a biological sample (e.g., blood and/or other tissues such as skin cells, skin biopsy samples, etc.) taken from the subject, diminished levels of the total number of pDCs in a subject or in a biological sample taken from the subject, or both. In some embodiments, the reduction in pDCs in the subject is about 1% to about 100% compared to the pDCs in the subject prior to administration of an ILT7-binding protein used in the methods described herein. In certain aspects, the a reduction in pDCs in the subject is at least about 1%, at least about 2%, at least about 5%, at least about 10%, at least about 20%, at least about 30%, at least about 30%, at least about 40%, at least about 50%, at least about 60%, at least about 70%, at least about 80%, at least about 90%, at least about 95%, at least about 96%, at least about 97%, at least about 98%, at least about 99%, or about 100% compared to pDCs in the subject prior to administration of an ILT7-binding protein used in the methods described herein. In specific embodiments, the reduction in pDCs in the subject is at least about 50% compared to pDCs in the subject prior to administration of an ILT7-binding protein used in the methods described herein. Thus, in certain embodiments, administration of a therapeutically effective amount of the ILT7-binding protein leads to at least about 10% reduction in total number of pDCs in the subject. In additional embodiments, administration of a therapeutically effective amount of the ILT7-binding protein leads to at least about 10% reduction in activated pDCs in the subject. In certain aspects, the pDCs are measured in a test biological sample taken from the subject. Therefore, in certain embodiments, administering a therapeutically effective amount of an ILT7-binding protein used in the methods described herein to a subject in need thereof leads to a reduction in pDCs in a test biological sample taken from the subject. In specific embodiments, the reduction in pDCs in a test biological sample taken from the subject is at least about 10% compared to pDCs in the test biological sample prior to administration of an ILT7-binding protein used in the methods described herein. In certain aspects, the test biological sample is blood. In specific aspects, the test biological sample is tissue, including, but not limited to, skin cells and skin biopsy specimens. In certain aspects, the pDCs are circulating pDCs. In other aspects, the pDCs are pDCs in the skin. In additional aspects, the reduction in pDCs is reversible.
In certain embodiments, administration of a therapeutically effective amount of an ILT7-binding protein used in the methods described herein to a subject in need thereof causes at least about 10% reduction in pDCs in the subject at about 5 minutes, at about 10 minutes, about 15 minutes, about 30 minutes, about 1 hour, about 2 hours, about 3 hours, about 6 hours, about 12 hours, about 24 hours, or about 48 hours following administration of the ILT7-binding protein. In other embodiments, administration of a therapeutically effective amount of an ILT7-binding protein used in the methods described herein to a subject in need thereof causes at least about 10% reduction in pDCs in a test biological sample taken from the subject at about 5 minutes, at about 10 minutes, about 15 minutes, about 30 minutes, about 1 hour, about 2 hours, about 3 hours, about 6 hours, about 12 hours, about 24 hours, or about 48 hours following administration of the ILT7-binding protein.
In certain embodiments, the reduction in pDCs persists for at least about 1 day, at least about 2 days, at least about 3 days, at least about 4 days, at least about 5 days, at least about 6 days, at least about 7 days, at least about 14 days, at least about 21 days, at least about 28 days, at least about 30 days, at least about 45 days, at least about 60 days, at least about 90 days, or at least about 180 days or longer following administration of a therapeutically effective amount of an ILT7-binding protein used in the methods described herein to a subject in need thereof. In some aspects, the reduction in pDCs persists for at least about 30 days following administration of a therapeutically effective amount of an ILT7-binding protein used in the methods described herein to a subject in need thereof. In additional aspects, the reduction in pDCs persists for at least about 60 days following administration of a therapeutically effective amount of an ILT7-binding protein used in the methods described herein to a subject in need thereof.
In other embodiments, the methods of the present disclosure can be used for reducing Cutaneous Lupus Erythematosus Disease Activity and Severity Index (CLASI) in a tissue of a subject in need thereof. The methods comprise administering to the subject a pharmaceutically effective amount of an ILT7-binding protein.
As used herein, the term “CLASI” refers to Cutaneous Lupus Erythematosus Disease Activity and Severity Index. The CLASI is a validated instrument for measuring skin manifestations of CLE. The CLASI consists of two scores: the first summarizes the inflammatory activity of the disease; the second is a measure of the damage done by the disease. The activity score includes erythema (0-3), scale/hypertrophy (0-2), mucous membrane lesions (0-1), recent hair loss (0-1) and non-scarring alopecia (0-3). The damage score represents dyspigmentation (0-1), scarring/atrophy/panniculitis (0-2), and scarring of the scalp (0-6). Patients are asked if their dyspigmentation lasts 12 months or longer, in which case, the dyspigmentation score is doubled. Each of the above parameters is measured in 13 different anatomical locations, included specifically because they are most often involved in CLE. The most severe lesion in each area is measured.
As used herein, the term “reduction CLASI” refers diminished levels of CLASI-Activity (CLASI-A) score in a subject or in a biological sample (e.g., issues such as skin cells, skin biopsy samples, etc.) taken from the subject, or diminished levels of CLASI-Damage (CLASI-D) score in a subject or in a biological sample taken from the subject, or both.
Thus, in certain aspects, the methods of the disclosure result in a reduced CLASI-A score in the subject. In certain aspects, a reduction in the CLASI-A score of a subject involves a reduction of the CLASI-A score by at least 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 points from a baseline value. In some embodiments, a reduction in the CLASI-A score of a subject involves a reduction of the CLASI-A score by at least 4 points from a baseline value. In specific embodiments, a reduction in the CLASI-A score of a subject involves a reduction of the CLASI-A score by at least 7 points from a baseline value. In other embodiments, a reduction in the CLASI-A score of a subject involves a reduction of the CLASI-A score by at least 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 99% from a baseline value. In specific embodiments, a reduction in the CLASI-A score of a subject involves a reduction of the CLASI-A score by at least 50% from a baseline value. In certain aspects, the baseline value is the value of the CLASI-A score in the subject prior to treatment with an ILT7-binding protein used in the methods described herein. In other aspects, the methods of the present disclosure result in a reduced CLASI-D score in the subject. In additional aspects, the methods of the present disclosure result in a reduced CLASI-A score and a reduced CLASI-D score in the subject.
The present disclosure is also directed to pharmaceutical compositions comprising the ILT7-binding proteins used in the methods described herein. In certain embodiments, the present disclosure provides for the use of an ILT7-binding protein used in the methods described herein in the manufacture of a medicament for treating a subject.
In some embodiments, a pharmaceutical composition of the disclosure comprises an ILT7-binding protein disclosed herein and one or more pharmaceutically acceptable carriers, diluents, or excipients. In this regard, “pharmaceutically acceptable carriers, diluents, or excipients” include but are not limited to any adjuvant, carrier, excipient, glidant, sweetening agent, diluent, preservative, dye/colorant, flavor enhancer, surfactant, wetting agent, dispersing agent, suspending agent, stabilizer, isotonic agent, solvent, or emulsifier that may or may not have been approved by the United States Food and Drug Administration as being acceptable for use in humans or domestic animals. For example, appropriate carriers are known to those skilled in the art and include stabilizers, diluents, and buffers. Suitable stabilizers include carbohydrates, such as sorbitol, lactose, mannitol, starch, sucrose, dextran, and glucose, and proteins, such as albumin or casein. Suitable diluents include saline, Hanks Balanced Salts, and Ringers solution. Suitable buffers include an alkali metal phosphate, an alkali metal carbonate, or an alkaline earth metal carbonate.
In certain aspects, the pharmaceutical compositions of the disclosure may further contain one or more auxiliary substance, such one or more lipids, phospholipids, carbohydrates, and lipopolysaccharides. In some embodiments, pharmaceutical compositions of the disclosure optionally comprise one or more additional active substances.
In certain cases, the pharmaceutical compositions of the disclosure can be prepared by techniques known to those skilled in the art. General considerations in the formulation and/or manufacture of pharmaceutical compositions may be found, for example, in Remington: The Science and Practice of Pharmacy 21st ed., Lippincott Williams & Wilkins, 2005 (incorporated herein by reference in its entirety). Generally, an ILT7-binding protein used in the methods described herein or fragments thereof is mixed with a carrier to form a solution, suspension, or emulsion. One or more of the additives discussed herein may be added in the carrier or may be added subsequently. The pharmaceutical compositions of the disclosure may be an aqueous solution, emulsion or suspension or may be a dried preparation. In certain aspects, the pharmaceutical compositions of the disclosure may be desiccated or lyophilized, for example, by freeze drying or spray drying for storage or formulations purposes. They may be subsequently reconstituted into liquid compositions by the addition of an appropriate liquid carrier or administered in dry formulation using methods known to those skilled in the art. In certain embodiments, the ILT7-binding proteins used in the methods described herein are stored as lyophilized powder and subsequently reconstituted into liquid compositions prior to administration into a subject in need thereof.
The choice of administration of the pharmaceutical composition will depend on the formulation that is selected. The pharmaceutical compositions of the disclosure are administered in a manner compatible with the dosage formulation, and in such amount as will be therapeutically effective. In certain aspects, a pharmaceutical composition of the disclosure is formulated into preparations in solid, semi-solid, liquid or gaseous forms, including, but not limited to, tablets, capsules, powders, granules, ointments, solutions, suppositories, injections, inhalants, gels, microspheres, and aerosols.
In certain instances, a pharmaceutical composition comprising an ILT7-binding protein used in the methods described herein may be in the form of a solid or liquid. In some aspects, the carrier(s) are particulate so that the compositions are, for example, in tablet or powder form. In other aspects, the carrier(s) are liquid, with a composition being, for example, an oral syrup, injectable liquid or an aerosol, which is useful in, for example, inhalatory administration. When intended for oral administration, a pharmaceutical composition comprising an ILT7-binding protein used in the methods described herein is in either solid or liquid form, where semi-solid, semi-liquid, suspension and gel forms are included within the forms considered herein as either solid or liquid.
In certain aspects, as a solid composition for oral administration, a pharmaceutical composition comprising an ILT7-binding protein used in the methods described herein may be formulated into a powder, granule, compressed tablet, pill, capsule, chewing gum, wafer or the like form. In some instances, such a solid composition will typically contain one or more inert diluents or edible carriers. In certain embodiments, one or more of the following may be additionally present: binders such as carboxymethylcellulose, ethyl cellulose, microcrystalline cellulose, gum tragacanth or gelatin; excipients such as starch, lactose or dextrins, disintegrating agents such as alginic acid, sodium alginate, Primogel, corn starch and the like; lubricants such as magnesium stearate or Sterotex; glidants such as colloidal silicon dioxide; sweetening agents such as sucrose or saccharin; a flavoring agent such as peppermint, methyl salicylate or orange flavoring; and a coloring agent.
In some aspects, when a pharmaceutical composition of the disclosure is in the form of a capsule, for example, a gelatin capsule, it may contain, in addition to materials disclosed herein, a liquid carrier such as polyethylene glycol or oil. Oral formulations may also include normally employed incipients such as, for example, pharmaceutical grades of saccharine, cellulose and magnesium carbonate.
In other aspects, a pharmaceutical composition of the disclosure is in the form of a liquid, for example, an elixir, syrup, solution, emulsion or suspension. In certain embodiments, the liquid may be for oral administration or for delivery by injection. In certain embodiments, when intended for oral administration, the pharmaceutical compositions of the disclosure contain, in addition to an ILT7-binding protein used in the methods described herein, one or more of a sweetening agent, preservatives, dye/colorant and flavor enhancer. In certain aspects, in a pharmaceutical composition intended to be administered by injection, one or more of a surfactant, preservative, wetting agent, dispersing agent, suspending agent, buffer, stabilizer and isotonic agent may be included. In certain aspects, a pharmaceutical composition of the disclosure is administered to a subject in need thereof intravenously. In specific aspects, a pharmaceutical composition of the disclosure is administered to a subject in need thereof by subcutaneous injection.
In certain cases, liquid pharmaceutical compositions comprising an ILT7-binding protein used in the methods described herein, whether they be solutions, suspensions or other like form, may include one or more of the following components: sterile diluents such as water for injection, saline solution, e.g., physiological saline, Ringer's solution, isotonic sodium chloride, fixed oils such as synthetic mono or diglycerides which may serve as the solvent or suspending medium, polyethylene glycols, glycerin, propylene glycol or other solvents; antibacterial agents such as benzyl alcohol or methyl paraben; antioxidants such as ascorbic acid or sodium bisulfite; chelating agents such as ethylenediaminetetraacetic acid; buffers such as acetates, citrates or phosphates and agents for the adjustment of tonicity such as sodium chloride or dextrose. In some cases, the preparation can be enclosed in ampoules, disposable syringes or multiple dose vials made of glass or plastic. In some embodiments, an injectable pharmaceutical composition is preferably sterile.
In other embodiments, a pharmaceutical composition comprising an ILT7-binding protein used in the methods described herein may be intended for topical administration, in which case the carrier may suitably comprise a solution, emulsion, ointment or gel base. In certain aspects, the base, for example, may comprise one or more of the following: petrolatum, lanolin, polyethylene glycols, bee wax, mineral oil, diluents such as water and alcohol, and emulsifiers and stabilizers. In other aspects, thickening agents may be present in a pharmaceutical composition for topical administration. In certain embodiments, if intended for transdermal administration, a pharmaceutical composition of an ILT7-binding protein used in the methods described herein may be included with a transdermal patch or iontophoresis device.
In yet other embodiments, the pharmaceutical composition comprising an ILT7-binding protein used in the methods described herein is intended for rectal administration, in the form, for example, of a suppository. For suppositories, binders and carriers may include, for example, polyalkalene glycols or triglycerides. In certain instances, a composition for rectal administration contains an oleaginous base as a suitable nonirritating excipient. Such bases include, without limitation, lanolin, cocoa butter or polyethylene glycol.
In other aspects, a pharmaceutical composition comprising an ILT7-binding protein used in the methods described herein comprises dosage units that can be administered as an aerosol. The term aerosol is used to denote a variety of systems ranging from those of colloidal nature to systems consisting of pressurized packages. In certain embodiments, delivery is accomplished by a liquefied or compressed gas or by a suitable pump system that dispenses the active ingredients. In some embodiments, aerosols of an ILT7-binding protein used in the methods described herein may be delivered in single phase, bi-phasic, or tri-phasic systems in order to deliver the active ingredient(s). In other embodiments, delivery of the aerosol includes the necessary container, activators, valves, subcontainers, and the like, which together may form a kit. One skilled in the art can readily determine specific aerosol formulations and delivery modes.
Pharmaceutical compositions of the disclosure may be administered in a suitable, nontoxic pharmaceutical carrier, may be comprised in microcapsules, microbeads, and/or may be comprised in a sustained release implant.
In some aspects, pharmaceutical compositions of the disclosure include materials that form a coating shell around the active ingredients. In some instances, the materials that form the coating shell are typically inert, and may be selected from, for example, sugar, shellac, and other enteric coating agents.
In yet other aspects, the pharmaceutical compositions of the disclosure in solid or liquid form include an agent that binds to an ILT7-binding protein used in the methods described herein and thereby assist in the delivery of the ILT7-binding protein used in the methods described herein. In certain cases, suitable agents that act in this capacity include a protein or a liposome.
In certain aspects, pharmaceutical compositions that will be administered to a subject take the form of one or more dosage units, where, for example, a tablet may be a single dosage unit, and a container of an ILT7-binding protein used in the methods described herein in aerosol form may hold a plurality of dosage units. Actual methods of preparing such dosage forms are known, or will be apparent to those skilled in this art; for example, see Remington: The Science and Practice of Pharmacy, 20th Edition (Philadelphia College of Pharmacy and Science, 2000). A composition to be administered will, in any event, contain a therapeutically effective amount of an ILT7-binding protein used in the methods described herein, or a pharmaceutically acceptable salt thereof, to aid in treatment of a disease or condition of interest in accordance with the teachings herein.
In certain embodiments, the pharmaceutical compositions of the disclosure comprise one or more additional therapeutically active substances. In other embodiments, a therapeutically effective dose of the pharmaceutical compositions of the disclosure is administered to a subject in need thereof in combination with one or more additional therapeutically active substances. As used herein, a “combination” refers to a combination comprising an ILT7-binding protein used in the methods described herein and one or more additional therapeutically active substances, each of which may be administered serially (sequentially), concurrently or simultaneously.
Pharmaceutical compositions of the disclosure may desirably be administered at several intervals in order to sustain therapeutic levels. Pharmaceutical compositions of the disclosure may be used in conjunction with other bacteriocidal or bacteriostatic methods.
Although the descriptions of pharmaceutical compositions provided herein are principally directed to pharmaceutical compositions which are suitable for administration to humans, it will be understood by the skilled artisan that such compositions are generally suitable for administration to subjects of all sorts. In certain aspects, the subject is a mammal. In certain aspects, a mammal includes primates, such as humans, monkeys and apes, and non-primates such as domestic animals, including laboratory animals and household pets and farm animals (e.g., cats, dogs, swine, cattle, sheep, goats, horses, rabbits), and non-domestic animals, such as wildlife, birds, or the like.
In autoimmune diseases, upon activation by immune complexes to self-nucleic acids, plasmacytoid dendritic cells (pDCs) secrete significant amounts of type I and type III interferons (IFNs). pDCs constitute about 0.4% of circulating white blood cells and can recognize viral nucleic acids, which are often bound to other proteins or to immunoglobulins. Although this response is believed to contribute to antiviral defense, evidence has accumulated that pDCs and type I IFNs also contribute to the pathogenesis of numerous autoimmune diseases. Type I IFN levels cannot be directly measured in a reliable way; however, binding of type I IFN to its receptor leads to local and systemic upregulation of type I IFN-inducible genes. The messenger ribonucleic acid (mRNA) levels of these type I IFN-inducible genes can be measured in blood and analyzed as a composite outcome referred to as the “type I interferon gene signature” (IFNGS). A test for the type I IFNGS was developed and cut-off values were established to score these signatures as “IFN test-high” and “IFN test-low”. Studies using this specific gene signature found that a subset of patients with an elevated type I IFN signature was identifiable in systemic lupus erythromatosus, dermatomyositis, polymyositis, systemic sclerosis, and Sjögren's syndrome.
A Phase 1a, randomized, site-blinded/sponsor-unblinded, placebo-controlled trial of a single escalating subcutaneous dose of the ILT7-binding protein used in the methods described herein was carried out in 5 successive cohorts of patients with systemic lupus erythematosus (SLE), Sjögren's syndrome (SS), dermatomyositis (DM), polymyositis (PM), or systemic sclerosis (SSc). The trial evaluated the safety, drug levels, pDC levels, anti-drug antibodies (ADA), and impact on a 21-gene type I IFNGS of the ILT7-binding protein used in the methods described herein (VIB7734).
All data were presented in the form of listings sorted by cohort, treatment, and subject number. Tabular summaries of the data collected were presented by treatment group. Categorical data was summarized by the frequency counts and percentage of subjects in each category. Percentages were calculated based on non-missing observations where applicable. Continuous variables were summarized by descriptive statistics including number of observations, mean, standard deviation, median, minimum, and maximum. In general, unless stated otherwise, “baseline” was defined as the last value prior to first dose of VIB7734.
A total of 36 subjects were enrolled in the study. The enrolled subjects had the following diagnoses: SLE 19 (53%), SS 16 (44%), SSc 3 (8%), PM 2 (6%), and DM 2 (6%). Baseline demographic characteristics were well-balanced and generally similar between the total VIB7734 group and the placebo group. The majority of the subjects were White and were females (32 [88.9%]). The enrolled subjects were randomized in a 3:1 ratio within 5 cohorts to receive a single subcutaneous dose of VIB7734 or matching placebo as follows:
A diagrammatic presentation of the study is provided in
Subjects received only one dose of VIB7734 during the study. As shown in
In each cohort, there was at least a 48 hour interval between the dosing of first and second subjects and between the second and the third subject. Starting with the third subject in each cohort, there was at least a 24 hour interval between the dosing of subsequent subjects. Dosing for Cohorts 2, 3, 4, and 5 commenced once all subjects in the previous cohort had been randomized and administered with VIB7734, all evaluable subjects had completed at least the Day 15 visit (Visit 6), and the cumulative safety data of all exposed subjects was reviewed by the DEC, who agreed the safety profile to be acceptable.
Serious adverse events occurred in 1 subject in the VIB7734 15 mg group (colitis) and 1 subject in the placebo group (death due to cerebral hemorrhage). At least one adverse event (AE) was reported in 69% of VIB7734-treated, and 80% of placebo-treated subjects. The most commonly reported AEs in VIB7734-treated subjects were diarrhea (12%) and upper respiratory tract infection (12%). No injection site reactions or hypersensitivity reactions occurred.
Blood samples were collected on Days 1, 2, 4, 8, 15, 29, 57, and 85 to evaluate anti-drug antibody (ADA) response to VIB7734 in human serum. These evaluations were performed utilizing a validated electrochemiluminescence immunoassay method for the detection, and confirmation and titration of anti-drug antibodies to VIB7734 in human serum. Samples found to be negative in the screening tier were reported to have a titer of <30.
Baseline and post-baseline ADA results were recorded for all 26 subjects in total ILT7-binding protein group and 9 subjects in placebo group. No positive results were observed in either treatment groups. No incidence of ADA persistent positive or transient positive was observed in either treatment groups. Thus, overall, for subcutaneous injection of VIB7734 in doses ranging from 1 to 150 mg, no safety, tolerability, or immunogenicity issues were identified.
Blood samples were collected on Days 1, 2, 4, 8, 15, 29, 57, and 85 to evaluate PK of VIB7734 in serum. Concentrations of VIB7734 were measured in human serum samples by utilizing a validated enzyme-linked immunosorbent assay (ELISA) immunoassay method. The validated measurement range of the assay was 0.025 μg/mL to 25.60 μg/mL. Results below the lower limit of quantitation (LLOQ) were reported as <0.10 μg/mL.
The PK analysis was performed on time data of concentration of VIB7734 from all 26 subjects who received any dose of VIB7734. Mean serum concentration-time profiles of VIB7734 following a single subcutaneous dose of 1, 5, 15, 50, or 150 mg are shown in
Whole blood samples for pDC levels were collected on Days 1, 2, 4, 8, 15, 29, 57, and 85. The baseline pDC level was defined as the mean of the levels measured at Visits 1 and 2. If the screening (Visit 1) sample was not drawn or failed for technical reasons, it was to be repeated and results had to be available before the subject could be randomized since the result was needed to determine that the subject met all inclusion/exclusion criteria. If the Day 1 (Visit 2) sample was not drawn or failed for technical reasons, the value from the Visit 1 sample was to be considered the baseline. The study site was blinded to post-baseline pDC levels.
The pDC levels were quantified in two ways during the study: 1) as a percentage of the CD45+ peripheral blood mononuclear cells (PBMCs, primary method), and 2) as a concentration of pDCs per μL (secondary method). The primary pDC measure is the pDCs as a % of CD45+ PBMCs since that is what is directly measured by the flow cytometry assay used in this study.
At baseline the mean pDC level in the blood was 0.13% (SD: 0.056%) of PBMCs in the VIB7734-treated subjects. The mean concentration of pDCs at baseline in the VIB7734-treated subjects was 2.53 cells/μL (SD: 1.24%). The levels and change from baseline in pDC (% of CD45+ cells) over time is presented in
There was decrease in the blood level of pDCs after SC administration of all tested doses of VIB7734. Median reductions of at least 50% in the pDC level of VIB7734-treated subjects were evident at 24 hours after dosing (the first blood draw done after dosing) in all VIB7734 dose groups, with a maximal reduction of 90%. Increasing doses were associated with a non-linear increase in pDC reduction. At Day 15, median pDC levels changed as follows for the VIB7734-treated cohorts: 1 mg: −57%, 5 mg: −66%, 15 mg: −70%, 50 mg: −82%, and 150 mg: −90%, versus +7.5% for the placebo-treated group.
Increasing doses were generally associated with a longer duration of pDC reduction. The effect was reversible in all cases. As shown in
The maximal degree of reduction from baseline of the median pDC level was −90%. The increase in the maximal depletion appears to nearly plateau at doses of 15 to 150 mg, suggesting that doses higher than 150 mg are unlikely to cause a greater degree of maximal depletion.
Whole blood was collected on screening and Days 1, 2, 4, 8, 15, 29, 57, and 85 to measure the expression of mRNA for certain types of type I IFN-inducible genes using a 21-gene assay. The type I IFNGS was determined by assaying the mRNA levels of 21 type I IFN-inducible genes in a biological sample taken from the subjects, determining an average value (mean or median) of the mRNA levels of 21 type I IFN-inducible gene, normalizing the average value against an average of mRNA levels of 3 housekeeping genes (18S rRNA, β actin, and GAPDH), and obtaining a composite outcome. The type I IFNGS was reported by two methods, “median fold change” and “median target neutralization.” The first method, called “median fold change” is the fold difference in levels of the gene products when compared to healthy controls, which are normalized to 1. Thus, for a subject, a median fold change of 4 indicates that the type I IFN-inducible gene products are 4 times higher than for healthy controls. The median fold change for each cohort at each visit are presented in Table 2.
The second metric, “median target neutralization,” is a measure of the percentage of the level of the gene products compared to the baseline result, which is normalized to 100%. This is useful for comparing change over time. For example, a median target neutralization ratio at a visit of 30% means that the type I IFN-inducible gene products are 30% of the level of what they were at baseline.
Table 3 shows the median target neutralization ratio by cohort and visit for the subgroup of subjects who had an elevated baseline type I IFN signature. The median neutralization ratio for the IFN-high subgroup was less than 100% for all VIB7734-treated groups at Day 4 (first timepoint measured after dosing), compared to 100% for the placebo group. Median neutralization ratio for the IFN-high subgroup was at its lowest at the Day 8 visit (37.9% for all VIB7734-treated vs. 118% for placebo. Median target neutralization of the IFN-high subgroup remained <100% for all VIB7734-treated cohorts at all timepoints with the exception of the lowest dose cohort (1 mg) which was >100% of baseline at the Day 8, 29, and 57 visits.
A Phase Ib, randomized, double-blinded (sponsor and site pharmacist were unblinded), placebo-controlled study was carried out to evaluate the safety and tolerability of multiple-ascending subcutaneous (SC) doses of VIB7734 when added to standard of care in subjects with at least one of the following autoimmune diseases: systemic lupus erythematosus (SLE), cutaneous lupus erythematosus (CLE), systemic sclerosis, polymyositis, and dermatomyositis (
A total of 31 adult subjects were enrolled in 3 sequential cohorts, with 8 subjects in Cohort 1, 12 subjects in Cohort 2, and 11 subjects in Cohort 3. Subjects were maintained on their standard of care treatment and an ILT7-binding protein (VIB7734) or placebo administration was performed in addition to this treatment. Randomization was not stratified. Cohorts were enrolled sequentially (
Cohort 1 enrolled a mixed disease population, comprising subjects with systemic lupus erythematosus (SLE) or Sjogren's syndrome with no minimum disease activity requirement, to evaluate the safety profile of multiple doses of VIB7734 in subjects across various pDC-driven indications. Cohorts 2 and 3 recruited active SLE or cutaneous lupus erythematosus (CLE) patients with a CLASI Activity score (CLASI-A) of ≥8 so that efficacy could be explored at the doses tested in these cohorts, and the effect on skin biopsy specimens could be examined. A trained physician-investigator for designee performed the CLASI-A assessment. Whenever possible, the same rater evaluated a subject throughout the study. Sites also designated a backup rater for each subject.
The screening procedures for Cohorts 2 and 3 include taking digital photographs of the existing skin lesions at Days 29, 57 and 85. The goals of the skin photography were 1) to confirm that the subject has skin lesions consistent with lupus as part of the screening procedures, and 2) to provide visual evidence of the effect of the drug on skin lesions. The investigator or sub-investigator who examined the patient at screening decided on the anatomic areas to be photographed based on the location of the lesions. These anatomic areas were documented in the screening eCRF in sufficient detail so that the same areas could be photographed at additional time points (Days 113 and 145). Lighting was maintained as consistent as possible at all photography visits. The photographs were uploaded and reviewed by a central reviewer to confirm that skin lesions consistent with lupus were present.
The multiple dose study had three study periods: screening, treatment period, and extended follow-up for pDC repletion (
An unblinded Dose Escalation Committee (DEC) reviewed the safety of each dose cohort according to pre-specified criteria to determine if it is safe to escalate to the next dosing cohort. For escalation from Cohort 1 to 2, the DEC reviewed the cumulative safety data after the 8th subject in Cohort 1 has completed the Day 15 visit (or when the last evaluable Cohort 1 subject reaches Day 15 if the 8th subject withdraws prior to Day 15). For escalation from Cohort 2 to 3, the DEC reviewed the cumulative safety data once 9 Cohort 2 subjects have completed the Day 15 visit. If the data from any cohort were inadequate to decide about the safety of escalating to the next cohort, then the sponsor could elect to hold escalation pending reassessment of the cohort at a later timepoint.
The safety and tolerability of VIB7734 was measured by the incidence of treatment-emergent adverse events (TEAEs), adverse events of special interest (AESIs), and treatment-emergent serious adverse events (TESAEs). Laboratory measurements, vital sign measurements, and ECG parameters were also evaluated as part of safety. Adverse event (AE) and serious adverse event (SAE) collection began after the subject signed the informed consent document and lasted until the final visit. TEAEs were defined as any AE that occurs after dosing on or after the day of first administration of VIB7734 through the end of follow-up. All AEs were required to be coded by the Medical Dictionary for Regulatory Activities (MedDRA). All SAEs were required to be reported, whether or not considered causally related to VIB7734, or to the study procedures. TEAEs, TESAEs, and TEAESIs were required to be summarized overall, as well as categorized by MedDRA System Organ Class and Preferred Term, by severity, and by relationship to VIB7734. AESIs were also required to be recorded within 24 hours of knowledge of the event on the eCRF, even if the event is non-serious. No AEs (
Blood samples were collected on Days 1, 29, 57, 85, 113, and 141, and, if applicable, on Days 197, 253, and 309 to evaluate anti-drug antibody (ADA) response to VIB7734 in human serum. ADA status and titer were summarized by treatment group. These evaluations were performed utilizing a validated immunoassay method. No ADA response to VIB7734 in human serum was observed in subjects in Cohorts 1,2 or 3 (data not shown).
Blood samples were collected on Days 1, 8, 15, 29, 36, 43, 57, 64, 71, 85, 113, and 141, and, if applicable, on Days 169, 197, 225, and 253 to evaluate PK of VIB7734 in human serum. The PK of VIB7734 in serum was measured utilizing a validated immunoassay method. Specific procedures for sample collection, processing, storage, and shipment can be found in a separate laboratory manual provided to the sites. Non-compartmental analysis were performed for VIB7734-treated subjects. VIB7734 concentration-time profiles were generated.
The effect of VIB7734 on circulating pDC levels was evaluated in blood using flow cytometry. Changes from baseline were described and level as a percent of baseline was summarized. Whole blood samples for pDC levels (all subjects) and for CD19+ B cells (at screening, for subjects previously administered rituximab, ocrelizumab, ofatumumab, or an experimental B-cell-depleting mAb) were collected on Days 1, 8, 15, 29, 36, 43, 57, 64, 71, 85, 113, and 141. The baseline pDC level is defined as the average of the levels measured at the Screening visit and the Day 1 (predose) level. If the screening (Visit 1) sample is not drawn or fails for technical reasons, it must be repeated and results must be available before the subject can be randomized since the result is needed to determine that the subject meets all inclusion/exclusion criteria. If only one value was available, then this value was used as the baseline.
The levels and change from baseline in pDCs (% of PBMC cells) over time in whole blood of subjects in Cohort 1 is presented in
The changes in pDCs levels (%) over time, as a percent of the baseline level (value using % peripheral blood mononuclear cells) in whole blood of subjects in Cohort 2 and Cohort 3 is presented in
The type I IFNGS in the skin and blood was measured using the 21-gene test. The effect of VIB7734 on the type I IFNGS in blood was evaluated in Cohorts 1, 2, and 3. Whole blood was collected at Days 1, 8, 15, 29, 43, 57, 71, 85, 113, and 141 in PAXgene tubes to measure the overexpression of mRNA for certain types of type I IFN-inducible genes. Any remaining RNA isolated from the samples was used for additional analytical studies of changes in gene expression. High type I IFNGS levels were present at baseline in whole blood of 18 of 23 subjects (78%) in cohorts 2 and 3.
To further evaluate the impact of VIB7734 on circulating type I IFN activity, gene signatures were generated from RNA of whole blood and IFNα protein levels were measured in serum at various timepoints from study participants and healthy donors. The majority of subjects demonstrated high circulating baseline type I IFN activity, with 73% subjects in the combined VIB7734-treated cohorts (i.e., in subjects combined from cohorts 1 (n=3), 2 (n=6), and 3 (n=8)) and 44% of placebo subjects having an IFN-inducible gene expression greater than that in healthy subjects at baseline, with a strong correlation observed between baseline type I IFNGS score and IFNα protein levels (r=0.573; p=0.0203).
As shown in
The relationship between baseline circulating type I IFN activity and clinical responsiveness to VIB7734 was also assessed in the combined VIB7734-treated cohort. As shown in
Clinical development in SLE has been difficult with a number of clinical compounds demonstrating inconsistent responses, likely a reflection of the great heterogeneity of the disease. The present study indicates that baseline type I IFN activity in blood serves as a predictor of clinical responsiveness to pDC depletion, where higher baseline levels of IFNα or type I IFNGS score identifies patients with a higher likelihood of clinical benefit.
The population for the efficacy analyses was subjects with SLE or CLE with an active skin lesion and baseline CLASI score of 8. The CLASI activity (CLASI-A) score ranges from 0 to 70, and can be used to categorize disease activity as mild (0-9), moderate (10-20) or severe (21-70). This population allows testing of the hypothesis that VIB7734 reduces skin manifestations of SLE or CLE. The clinical efficacy endpoint is change in activity score of the CLASI. Both CLASI-A score and CLASI damage score were calculated at Days 1, 15, 29, 43, 57, 85, 113, and 141. Subjects who newly initiated or increased their dose of oral or topical corticosteroids or immunosuppressants in contradiction to the protocol were considered non-responders in the responder analyses. The changes from baseline in CLASI-A was analyzed using mixed-effects model for repeated measures with treatment, baseline type I IFN signature status (low vs. high), visit, and the interaction between visit and treatment as covariates. The proportion of subjects with 4-point reduction in CLASI-A at Day 85 and the proportion of subjects with 50% reduction in CLASI-A at Day 85 was analyzed using a logistic regression with treatment and baseline type I IFN signature status as covariates. Subgroup analyses was conducted by baseline type I IFN signature status (low vs. high) for exploratory purposes.
The observed CLASI-A scores along with their changes from baseline are summarized for Cohort 2 subjects (
Most subjects in Cohort 2 (
Further, at days 15, 29, 85 and 113, a higher proportion of VIB7734-treated subjects in Cohort 2 showed an at least 4-point reduction in CLASI-A score from baseline compared to placebo-treated Cohort 2 subjects (
Skin biopsy was conducted for subjects in Cohorts 2 and 3, and the effect of VIB7734 on pDC levels and Type 1 interferon (IFN-1) activity (assayed by measuring Myxovirus protein A (MxA) levels) from the skin biopsy was evaluated. The results are presented in
Each skin biopsy requires one 4 mm punch biopsy. The anatomic site selected for biopsy was an area of active inflammation as indicated by erythema or scale. The punch biopsy site was closed with a single suture. The baseline skin biopsy was performed prior to dosing on Day 1 or during the screening period. However, the baseline skin biopsy was not performed until other screening procedures had confirmed that the subject is eligible for the study. A repeat biopsy was performed on Day 85 (±14 days) or at the Early Discontinuation Visit if the subject discontinued the study prior to the Day 85 visit. The Day 85 biopsy was taken from the same anatomic site adjacent to the baseline biopsy site, avoiding the scar tissue from the previous punch biopsy. The effect of VIB7734 on pDCs in skin lesions was measured by evaluating the number of pDCs/mm2 in skin biopsy samples before and after drug administration. pDCs were identified using an anti-ILT7 clone. The rationale for measuring the change in pDC density in affected skin was to confirm that VIB7734 depletes pDCs in a target tissue in addition to blood, and to determine if there is a difference between the dose necessary to achieve a target level of pDC depletion in the blood as compared to the skin. This will assist with dose selection for subsequent clinical trials. The density of all inflammatory cells were also measured. This demonstrated whether reducing pDC levels leads to downstream effects on the density of other inflammatory cells in the skin. The observed pDC levels and level as a percent of baseline were summarized.
Type 1 interferon (IFN-1) activity is upregulated in skin lesions in patients with CLE. The effect of VIB7734 on IFN-1 activity in skin lesions was also determined by assaying levels of Myxovirus protein A (MxA), an interferon regulated protein in skin biopsies from subjects in Cohort 2 (
Inflammatory infiltrate (CD45+ cells) is upregulated in skin lesions in patients with CLE. The effect of VIB7734 on inflammatory infiltrate in skin lesions was also determined by assaying levels of CD45+ cells per square mm over time in skin biopsies from subjects in Cohort 2 (
VIB7734 reversibly depletes circulating pDCs with monthly dosing. Additionally, VIB7734 reduces type I IFNGS for the duration of the dosing. VIB7734 reduces also reduces MxA levels in skin and CD45 levels in skin. CLASI scores were improved on treatment with VIB7734 (particularly with the 150 mg dose). No safety issues were identified in subjects with 3 months of dosing with VIB7734. No abnormal or clinically significant ECGs were observed in subjects treated with VIB7734. Further, there were no cases of increase of QT interval by >30 msec in VIB7734-treated subjects.
Skin biopsy samples from Cohort 2 and Cohort 3 subjects were also formalin-fixed and paraffin-embedded to enable immunohistochemistry (IHC) and other analyses.
As shown in
Thus, there was high variability in the placebo group in Cohort 2 both at baseline and in responses over time in pDC counts and IFN activity in the skin. In contrast, more consistent reductions in pDC counts and IFN activity in skin were observed in the VIB7734-treated group in Cohort 2.
As shown in
As shown in
To investigate the contribution of pDCs to local type I IFN activity in the tissue, skin samples from subjects treated with placebo or VIB7734 were also stained for the well-characterized, type I IFN-inducible MxA protein (
It was further observed that CLASI responders in VIB7734-treated Cohort 3 subjects were largely associated with moderate/high pDC/MxA levels in the skin and high IFN at baseline (note: all VIB7734 treated subjects in Cohort 3 has high baseline blood IFNGS). Depleting pDCs with VIB7734 resulted in a profound reduction in type I IFN activity in CLE skin, demonstrating a fundamental role for these cells in IFNα production in autoimmune tissue.
This application is a continuation of International Application No. PCT/US2020/063396, filed Dec. 4, 2020, which claims the benefit of priority to U.S. Provisional Application No. 62/944,845, filed Dec. 6, 2019, U.S. Provisional Application No. 63/023,820, filed May 12, 2020, U.S. Provisional Application No. 63/024,182, filed May 13, 2020, U.S. Provisional Application No. 63/083,649, filed Sep. 25, 2020, and U.S. Provisional Application No. 63/109,923, filed Nov. 5, 2020, each of which is entirely incorporated herein by reference for all purposes.
| Number | Date | Country | |
|---|---|---|---|
| 63109923 | Nov 2020 | US | |
| 63083649 | Sep 2020 | US | |
| 63024182 | May 2020 | US | |
| 63023820 | May 2020 | US | |
| 62944845 | Dec 2019 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/US2020/063396 | Dec 2020 | US |
| Child | 17831784 | US |
