Patent Application
20200397892
The present disclosure relates to adjuvants for enhancing immune responses. More particularly, the disclosure relates to oncolytic viruses as adjuvants.
Pathogens and disease cells comprise antigens that can be detected and targetted by the immune system, thus providing a basis for immune-base therapies, including immunogenic vaccines and immunotherapies. In the context of cancer treatment, for example, immunotherapy is predicated on the fact that cancer cells often have molecules on their cell surfaces that can be recognized and targetted.
Viruses have also been employed in cancer therapy, in part for their ability to directly kill disease cells. For example, oncolytic viruses (OVs) specifically infect, replicate in and kill malignant cells, leaving normal tissues unaffected. Several OVs have reached advanced stages of clinical evaluation for the treatment of various neoplasms (Russell S J. et al., (2012) Nat Biotechnol 30:658-670). In addition to the vesicular stomatitis virus (VSV) (Stojdl D F. et al., (2000) Nat Med 6:821-825; Stojdl D F. et al., (2003) Cancer Cell 4:263-275), other rhabdoviruses displaying oncolytic activity have been described recently (Brun J. et al., (2010) Mol Ther 18:1440-1449; Mahoney D J. et al., (2011) Cancer Cell 20:443-456). Among them, the non-VSV Maraba virus showed the broadest oncotropism in vitro (WO 2009/016433). A mutant Maraba virus with improved tumour selectivity and reduced virulence in normal cells was engineered. The attenuated strain is a double mutant strain containing both G protein (Q242R) and M protein (L123W) mutations. In vivo, this attenuated strain, called MG1 or Maraba MG1, demonstrated potent anti-tumour activity in xenograft and syngeneic tumour models in mice, with superior therapeutic efficacy than the attenuated VSV, VSVΔM51 (WO 2011/070440).
Various strategies have been developed to improve OV-induced anti-tumour immunity (Pol J. et al., (2012) Virus Adaptation and Treatment 4:1-21). The strategies take advantage of both the oncolytic activity of the OV itself, and the ability to generate immunity to tumour-associated antigens. One strategy, defined as an oncolytic vaccine, consists of expressing a tumour antigen from the OV (Russell S J. et al., (2012) Nat Biotechnol 30:658-670). Previously, it has been demonstrated that VSV could also be used as a cancer vaccine vector (Bridle B W. et al., (2010) Mol Ther 184:4269-4275). When applied in a heterologous prime:boost setting to treat a murine melanoma model, a VSV-human dopachrome tautomerase (hDCT) oncolytic vaccine not only induced an increased tumour-specific immunity to DCT but also a concomitant reduction in antiviral adaptive immunity. As a result, the therapeutic efficacy was dramatically improved with an increase of both median and long term survivals (WO 2010/105347). Three specific prime:boost combination therapies are disclosed in PCT Application No. PCT/CA2014/050118. The combination therapies include a lentivirus that encodes as an antigen: a Human Papilloma Virus (HPV) E6/E7 fusion protein, human Six-Transmembrane Epithelial Antigen of the Prostate (huSTEAP) protein, or Cancer Testis Antigen 1; and a Maraba MG1 virus that encodes the same antigen. PCT Application No. PCT/CA2014/050118 also discloses a prime:boost combination therapy using an adenovirus that encodes MAGEA3 as an antigen, and a Maraba MG1 virus that encodes the same antigen. PCT Application No. PCT/IB2017/000622 disclose combination prime:boost therapies involving oncolytic viruses that infect, replicate, and kill malignant cells. The viruses are engineered to encode and express antigenic proteins based on tumour associated antigens. The antigenic proteins (i) generate immunity and (ii) induce an immune response that yields a therapeutic effect.
It would be desirable to provide therapies that are more readily adaptable to targets, and/or susceptible to personalization.
The following summary is intended to introduce the reader to one or more inventions described herein but not to define any one of them.
It is an object of the present disclosure to obviate or mitigate at least one disadvantage of previous approaches.
It has surprisingly been found that oncolytic viruses can serve as adjuvants. The authors of the present disclosure have found that an oncolytic virus administered to a mammal can adjuvant an immune response to an administered antigenic protein that is not encoded by the virus. The therapies according to the present disclosure thus do not require a virus-encoded antigen. In the context of a prime:boost therapy, for example, the prime, the boost, or both may comprise a virus and a separate, non-virus-encoded antigenic protein. These results are unexpected, as it was previously thought that viral expression of an encoded antigen was important for stimulation of the immune response to the antigenic protein. With no need for modification of the oncolytic virus to encode the antigenic protein, therapies can be more adapted to different targets, e.g., using synthetic peptides. They can be more readily personalized, e.g., to target the tumour-associated antigens of a given tumour.
In one aspect, there is provided a combination prime:boost therapy for use in inducing an immune response in a mammalian subject, wherein: the prime comprises at least one antigenic protein, formulated to generate the immune response in the mammal; and the boost comprises a virus and at least one antigenic protein, formulated to induce the immune response in the mammal; wherein the at least one antigenic protein of the prime and the at least one antigenic protein of the boost are based on the same at least one tumour associated antigen, and wherein the at least one antigenic protein of the boost is not encoded by the virus of the boost.
In one aspect, there is provided a composition comprising a prime or a boost for use in inducing an immune response in a mammalian subject in a combination prime:boost treatment, wherein: the prime comprises at least one antigenic protein, formulated to generate the immune response in the mammal; and the boost comprises a virus and at least one antigenic protein, formulated to induce the immune response in the mammal; wherein the at least one antigenic protein of the prime and the at least one antigenic protein of the boost are based on the same at least one tumour associated antigen, and wherein the at least one antigenic protein of the boost is not encoded by the virus of the boost.
In one aspect, there is provided a composition comprising a prime for use in inducing an immune response in a mammalian subject in a combination prime:boost treatment, wherein: the prime comprises at least one antigenic protein, formulated to generate the immune response in the mammal; and the boost comprises a virus and at least one antigenic protein, formulated to induce the immune response in the mammal; wherein the at least one antigenic protein of the prime and the at least one antigenic protein of the boost are based on the same at least one tumour associated antigen, and wherein the at least one antigenic protein of the boost is not encoded by the virus of the boost.
In one aspect, there is provided a composition comprising a boost for use in inducing an immune response in a mammalian subject in a combination prime:boost treatment, wherein: the prime comprises at least one antigenic protein, formulated to generate the immune response in the mammal; and the boost comprises a virus and at least one antigenic protein, formulated to induce the immune response in the mammal; wherein the at least one antigenic protein of the prime and the at least one antigenic protein of the boost are based on the same at least one tumour associated antigen, and wherein the at least one antigenic protein of the boost is not encoded by the virus of the boost.
In another aspect, there is provided a kit for use in inducing an immune response in a mammalian subject, wherein the kit comprises: a prime comprising at least one antigenic protein, formulated to generate the immune response in the mammal; and a boost comprising a virus and at least one antigenic protein, formulated to induce the immune response in the mammal; wherein the at least one antigenic protein of the prime and the at least one antigenic protein of the boost are based on the same at least one tumour associated antigen, wherein the at least one antigenic protein of the boost is not encoded by the virus of the boost.
In another aspect, there is provided a use of the combination prime:boost therapy described herein for treatment of a tumour in a mammalian subject.
In another aspect, there is provided the combination prime:boost therapy described herein for use in treatment of a tumour in a mammalian subject.
In another aspect, there is provided a method of treating a tumour in a mammalian subject, the method comprising administering to the subject the combination prime:boost therapy described herein.
In another aspect, there is provided a method for producing the combination prime:boost therapy described herein, the method comprising: synthesizing the at least one antigenic protein of the boost, and producing the combination prime:boost therapy.
In another aspect, there is provided a method for producing the combination prime:boost therapy described herein, the method comprising: synthesizing the at least one antigenic protein of the prime, and producing the combination prime:boost therapy.
In another aspect, there is provided a use of an oncolytic virus and at least one antigenic protein for inducing an immune response in a mammalian subject, wherein the at least one antigenic protein is not encoded by the oncolytic virus.
In another aspect, there is provided a use of an oncolytic virus for adjuvanting an immune response to at least one antigenic protein in a mammalian subject, wherein the at least one antigenic protein is not encoded by the oncolytic virus.
In another aspect, there is provided a method of adjuvanting an immune response to at least one antigenic protein in a mammalian subject, the method comprising administering to the subject an oncolytic virus and the at least one antigenic protein, wherein the at least one antigenic protein is not encoded by the virus.
In another aspect, there is provided an immunogenic composition comprising an oncolytic virus and at least one antigenic protein, wherein the at least one antigenic protein is not encoded by the oncolytic virus.
Other aspects and features of the present disclosure will become apparent to those ordinarily skilled in the art upon review of the following description of specific embodiments in conjunction with the accompanying figures.
Embodiments of the present disclosure will now be described, by way of example only, with reference to the attached Figures.
CT26Mut27 and CT26Mut37) (day 14).
The present disclosure provides oncolytic viruses for use as immunologic adjuvants. Generally, the oncolytic viruses are capable of adjuvanting immune responses to antigenic proteins that are not encoded by the virus. In the context of prime:boost therapies, (1) the prime comprises an antigenic protein, and (2) the boost comprises a virus at and an antigenic protein, which is not encoded by the virus, with the antigenic protein of the prime and that of the boost based on the same antigen. The fact that the antigenic protein is not encoded by the virus means that the therapies may be readily adapted, may be readily personalized, or may be readily formulated.
Combination Prime:Boost Therapies for Cancer
In one aspect, there is provided a combination prime:boost therapy for use in inducing an immune response in a mammalian subject, wherein the prime comprises at least one antigenic protein, formulated to generate the immune response in the mammal; and the boost comprises a virus and at least one antigenic protein, formulated to induce the immune response in the mammal; wherein the at least one antigenic protein of the prime and the at least one antigenic protein of the boost are based on the same at least one tumour associated antigen, and wherein the at least one antigenic protein of the boost is not encoded by the virus of the boost.
In the context of the present disclosure, a “combination prime:boost therapy” should be understood to refer to therapies for which (1) the at least one antigenic protein of the prime and (2) the virus and the at least one antigenic protein of the boost are to be administered as a prime:boost treatment. The prime and boost need not be physically provided or packaged together, since the prime is to be administered first and the boost is to be administered only after an immune response has been generated in the mammal. In some examples, the combination may be provided to a medical institute, such as a hospital or doctor's office, in the form of a package (or plurality of packages) of the prime, and a package (or plurality of packages) of the boost. The packages may be provided at different times. In other examples, the combination is provided to a medical institute, such as a hospital or doctor's office, in the form of a package that includes both the prime and the boost. A combination prime:boost therapy may also be referred as a combination prime:boost vaccine.
The term “mammal”, as used herein, refers to humans as well as non-human mammals. In one embodiment, the mammal may be a human.
By the term “antigenic protein” is meant any peptide comprising an immunogenic (antigenic) sequence that is capable of eliciting a biologically significant immune response.
By “tumour associated antigen” is meant any immunogen that is that is associated with tumour cells, and that is either absent from or less abundant in healthy cells or corresponding healthy cells (depending on the application and requirements). For instance, the tumour associated antigen may be unique, in the context of the organism, to the tumour cells.
By “not encoded by the virus”, as used herein, is mean that the at least one antigenic protein of the boost is not produced by transcription and translation of the nucleic acid sequences of the virus of the boost. The same applies when the term pertains to the prime in embodiments in which the prime comprises a virus and the at least one antigenic protein of the prime is not encoded by the virus of the prime. It will be understood that this does not preclude the virus, in each case, being modified or engineered. In certain embodiments, the antigenic proteins are not part of the viral particles. In certain embodiments, the antigenic proteins are not attached, conjugated, or otherwise physically connected to the viral particles. By this, is meant that there no covalent bonds between the antigenic proteins and the viral particles. In some embodiments, the antigenic proteins are not physically associated with the viral particles. Physically associated, in this context, indicates non-covalent interactions.
By “based on the same at least one tumour associated antigen” is meant that the at least one antigenic protein of the prime and the at least one antigenic protein of the boost are design or selected, such that they each comprise sequences eliciting an immune reaction to the same tumour associated antigen. It will be appreciated that the at least one antigenic protein of the prime and the at least one antigenic protein of the boost need not be exactly the same in order to accomplish this. For instance, they may be peptides comprising sequences that partially overlap, with the overlapping segment comprising a sequence corresponding to the tumour associated antigen, or a sequence designed to elicit an immune reaction to the tumour associated antigen, thereby allowing an effective prime and boost to the same antigen to be achieved. However, in one embodiment, the at least one antigenic protein of the prime and the at least one antigenic protein of the boost are the same.
In one embodiment, the at least one tumour associated antigen is based on the mutanome of a tumour of the mammalian subject.
By “mutanome” is meant the collective of an individual mammal's tumour-specific alterations and mutations, which encode a set of antigens that are specific to the subject. These are different from “shared” antigens, which are expressed in tumours from multiple patients and are typically normal, non-mutated self-proteins. Mutanome-encoded peptides may evoke a more vigorous T cell response due to a lack of thymic tolerance against them, and this immunity may be restricted to tumours, since the mutated gene product is only expressed in tumours (Overwijk et al.: Mining the mutanome: developing highly personalized Immunotherapies based on mutational analysis of tumours. Journal for ImmunoTherapy of Cancer 2013 1:11). The mutanome can be readily determined for a given tumour, e.g. by next generation sequencing.
In one embodiment, the at least one antigenic protein of the prime comprises a plurality antigenic proteins, and the at least one antigenic protein of the boost comprises a plurality of antigenic proteins, each of which is not encoded by the virus of the boost, and the plurality of antigenic proteins of the prime and the plurality of antigenic proteins of the boost are based on the same plurality of tumour associated antigens.
By “based on the same plurality of tumour associated antigens” it will be understood that, for each tumour associated antigen in the plurality, there will be at least one antigenic protein in the prime and at least one antigenic protein in the boost for that tumour associated antigen, such that each tumour associated antigen that is targetted will have at least one corresponding pair of prime/boost antigenic proteins. As above, it will be appreciated that plurality of antigenic proteins of the prime and the plurality of antigenic proteins of the boost need not be the same, and that pairs of antigenic proteins from the prime and boost may elicit an immune response to the same tumour associated antigen without being exactly the same. For instance, the pairs may be partially overlapping, with the overlapping segment comprising a sequence corresponding to the tumour associated antigen, or a sequence designed to elicit an immune response to the tumour associated antigen. However, in one embodiment, the plurality of antigenic proteins of the prime and the plurality of antigenic proteins of the boost are the same.
In one embodiment, the plurality of tumour associated antigens are based on the mutanome of a tumour the mammalian subject.
In one embodiment, the virus of the boost is an oncolytic virus.
By “oncolytic virus” is meant any one of a number of viruses that have been shown, when active, replicate and kill tumour cells in vitro or in vivo. These viruses may naturally oncolytic viruses, or virus that have been modified to produce or improve oncolytic activity. As used here, in certain embodiments the term may encompass attenuated, replication defective, inactivated, engineered, or otherwise modified forms of an oncolytic virus suited to purpose. Thus, in some embodiments it will be understood that what is termed an “oncolytic virus” for the purposes of description may not actually retain oncolytic activity. The use of inactive viruses can be desirable in context in which it is undesirable to administer active or “live” virus.
In one embodiment, the virus of the boost is a Rhabdovirus.
“Rhabdovirus” include, inter alia, one or more of the following viruses or variants thereof: Carajas virus, Chandipura virus, Cocal virus, Isfahan virus, Piry virus, Vesicular stomatitis Alagoas virus, BeAn 157575 virus, Boteke virus, Calchaqui virus, Eel virus American, Gray Lodge virus, Jurona virus, Klamath virus, Kwatta virus, La Joya virus, Malpais Spring virus, Mount Elgon bat virus, Perinet virus, Tupaia virus, Farmington, Bahia Grande virus, Muir Springs virus, Reed Ranch virus, Hart Park virus, Flanders virus, Kamese virus, Mosqueiro virus, Mossuril virus, Barur virus, Fukuoka virus, Kern Canyon virus, Nkolbisson virus, Le Dantec virus, Keuraliba virus, Connecticut virus, New Minto virus, Sawgrass virus, Chaco virus, Sena Madureira virus, Timbo virus, Almpiwar virus, Aruac virus, Bangoran virus, Bimbo virus, Bivens Arm virus, Blue crab virus, Charleville virus, Coastal Plains virus, DakArK 7292 virus, Entamoeba virus, Garba virus, Gossas virus, Humpty Doo virus, Joinjakaka virus, Kannamangalam virus, Kolongo virus, Koolpinyah virus, Kotonkon virus, Landjia virus, Manitoba virus, Marco virus, Nasoule virus, Navarro virus, Ngaingan virus, Oak- Vale virus, Obodhiang virus, Oita virus, Ouango virus, Parry Creek virus, Rio Grande cichlid virus, Sandjimba virus, Sigma virus, Sripur virus, Sweetwater Branch virus, Tibrogargan virus, Xiburema virus, Yata virus, Rhode Island, Adelaide River virus, Berrimah virus, Kimberley virus, or Bovine ephemeral fever virus. In certain aspects, rhabdovirus can refer to the supergroup of Dimarhabdovirus (defined as rhabdovirus capable of infection both insect and mammalian cells).
In one embodiment, the Rhabdovirus is a Maraba virus or an engineered variant thereof.
By “engineered variant” will be understood a virus that has been genetically modified, e.g. by recombinant DNA technology. Such viruses may comprise, for example, mutations, insertions, deletions, or rearrangements relative to a wild-type virus.
In one embodiment, the virus of the boost is attenuated.
An “attenuated” virus is one having reduced the virulence, but which is still viable (or “live”).
In one embodiment, the virus of the boost is replication defective.
In one embodiment, the attenuated virus is an attenuated Maraba virus comprising a Maraba G protein in which amino acid 242 is mutated, and a Maraba M protein in which amino acid 123 is mutated. In one embodiment, amino acid 242 of the G protein is arginine (Q242R), and the amino acid 123 of the M protein is tryptophan (L123W). An example of the Maraba M protein is described in PCT Application No. PCT/IB2010/003396, which is incorporated herein by reference, wherein it is referred to as SEQ ID NO: 4. An example of the Maraba G protein is described PCT Application No. PCT/IB2010/003396, wherein it is referred to as SEQ ID NO: 5. In one embodiment, the virus of the boost is the Maraba double mutant (“Maraba DM”) described in PCT Application No. PCT/IB2010/003396. In one embodiment, the virus of the boost is the “Maraba MG1” described in PCT Application No. PCT/CA2014/050118, which is incorporated herein by reference.
In one embodiment, the virus of the boost is an adenovirus, a vaccinia virus, measles virus, or a vesicular stomatitis virus.
In one embodiment, the virus of the boost is an adenovirus, a vaccinia virus, or a vesicular stomatitis virus.
In one embodiment, the boost is formulated for intravenous, intramuscular, or intratumoral administration.
In one embodiment, the prime is formulated for intravenous, intramuscular, or intratumoral administration.
In one embodiment, the virus of the boost is inactivated. In one embodiment, the virus of the boost is UV-inactivated.
In one embodiment, the prime additionally comprises a non-viral immunologic adjuvant.
By “immunologic adjuvant” will be understood a molecule that potentiates the immune response to an antigen and/or modulates it towards the desired immune response. One example is polyl:C.
In one embodiment, the prime additionally comprises a virus, wherein the virus of the prime is immunologically distinct from the virus of the boost.
By “immunologically distinct” will be understood that the viruses do not product antisera that cross react with one another. The use of immunological distinct viruses in the prime and boost permits an effective prime/boost response to the target antigen that is commonly targetted by the prime and boost. The virus of the prime may be any one of the above-described options for the virus of the boost, provided that the viruses of the prime and boost are immunologically distinct.
In one embodiment, the virus of the prime is an adenovirus. The virus of the prime may be tumour selective. For example, the adenovirus of the prime may comprise a deletion in E1 and E3, rendering the virus susceptible to p53 inactivation. Since many tumours lack p53, such a modification effective renders the virus tumour-specific, and hence oncolytic. In one embodiment, the adenovirus is of serotype 5.
The virus of the prime may encode the at least one antigenic protein of the prime. Where multiple antigenic proteins are used in the prime, some or all of them may be encoded by the virus of the prime. For example, the virus of the prime may comprise a plurality of virus types, each type being engineered to encode one of the antigenic proteins. However, in one embodiment, the at least one antigenic protein of the prime is/are not encoded by the virus of the prime. Where a plurality of antigenic proteins are used, in one embodiment none of them will be encoded by the virus of the prime.
In one embodiment, the virus of the prime may be attenuated. In one embodiment, wherein the virus of the prime is inactivated. In one embodiment, the virus of the prime is UV inactivated.
In one embodiment, the at least one antigenic protein of the prime comprises a synthetic peptide. In one embodiment, the synthetic peptide of the prime is a synthetic long peptide (SLP). The at least one antigenic protein of the prime may be 8 to 250 amino acids in length. Within this range, it may at least 10, at least 20, at least 30, at least 40, or at least 50 amino acids in length. With all these applicable ranges, may be less than 200, less than 150, less than 125, less than 100, less than 75, less than 50, less than 40, or less than 30 amino acids in length. Any combination of the stated upper and lower limits is envisaged.
In one embodiment, the at least one antigenic protein of the boost comprises a synthetic peptide. In one embodiment, the synthetic peptide of the boost is a synthetic long peptide (SLP). The at least one antigenic protein of the boost may be 8 to 250 amino acids in length. Within this range, it may at least 10, at least 20, at least 30, at least 40, or at least 50 amino acids in length. With all these applicable ranges, may be less than 200, less than 150, less than 125, less than 100, less than 75, less than 50, less than 40, or less than 30 amino acids in length. Any combination of the stated upper and lower limits is envisaged.
The combination prime:boost therapy may additionally include an immune-potentiating compound, such as cyclophosphamide (CPA), that increases the prime immune response to the tumour associated antigenic protein generated in the mammal by administrating the first virus. Cyclophosphamide is a chemotherapeutic agent that may lead to enhanced immune responses against the tumour associated antigenic protein.
Compositions for Use
In one aspect, there is provided a composition comprising a prime or a boost for use in inducing an immune response in a mammalian subject in a combination prime:boost treatment, wherein: the prime comprises at least one antigenic protein, formulated to generate the immune response in the mammal; and the boost comprises a virus and at least one antigenic protein, formulated to induce the immune response in the mammal; wherein the at least one antigenic protein of the prime and the at least one antigenic protein of the boost are based on the same at least one tumour associated antigen, and wherein the at least one antigenic protein of the boost is not encoded by the virus of the boost.
In one aspect, there is provided a composition comprising a prime for use in inducing an immune response in a mammalian subject in a combination prime:boost treatment, wherein: the prime comprises at least one antigenic protein, formulated to generate the immune response in the mammal; and the boost comprises a virus and at least one antigenic protein, formulated to induce the immune response in the mammal; wherein the at least one antigenic protein of the prime and the at least one antigenic protein of the boost are based on the same at least one tumour associated antigen, and wherein the at least one antigenic protein of the boost is not encoded by the virus of the boost.
In one aspect, there is provided a composition comprising a boost for use in inducing an immune response in a mammalian subject in a combination prime:boost treatment, wherein: the prime comprises at least one antigenic protein, formulated to generate the immune response in the mammal; and the boost comprises a virus and at least one antigenic protein, formulated to induce the immune response in the mammal; wherein the at least one antigenic protein of the prime and the at least one antigenic protein of the boost are based on the same at least one tumour associated antigen, and wherein the at least one antigenic protein of the boost is not encoded by the virus of the boost.
In one embodiment, the at least one antigenic protein of the prime and the at least one antigenic protein of the boost are the same.
In one embodiment, the at least one tumour associated antigen is based on the mutanome of a tumour of the mammalian subject.
In one embodiment, the at least one antigenic protein of the prime comprises a plurality antigenic proteins, and the at least one antigenic protein of the boost comprises a plurality of antigenic proteins, each of which is not encoded by the virus of the boost, and the plurality of antigenic proteins of the prime and the plurality of antigenic proteins of the boost are based on the same plurality of tumour associated antigens.
In one embodiment, the plurality of antigenic proteins of the prime and the plurality of antigenic proteins of the boost are the same.
In one embodiment, the plurality of tumour associated antigens are based on the mutanome of a tumour the mammalian subject.
In one embodiment, the virus of the boost is an oncolytic virus.
In one embodiment, the virus of the boost is a Rhabdovirus.
In one embodiment, the Rhabdovirus is a Maraba virus or an engineered variant thereof.
In one embodiment, the virus of the boost is attenuated.
In one embodiment, the virus of the boost is replication defective.
In one embodiment, the attenuated virus is an attenuated Maraba virus comprising a Maraba G protein in which amino acid 242 is mutated, and a Maraba M protein in which amino acid 123 is mutated. In one embodiment, amino acid 242 of the G protein is arginine (Q242R), and the amino acid 123 of the M protein is tryptophan (L123W). An example of the Maraba M protein is described in PCT Application No. PCT/IB2010/003396, which is incorporated herein by reference, wherein it is referred to as SEQ ID NO: 4. An example of the Maraba G protein is described PCT Application No. PCT/IB2010/003396, wherein it is referred to as SEQ ID NO: 5. In one embodiment, the virus of the boost is the Maraba double mutant (“Maraba DM”) described in PCT Application No. PCT/IB2010/003396. In one embodiment, the virus of the boost is the “Maraba MG1” described in PCT Application No. PCT/CA2014/050118, which is incorporated herein by reference.
In one embodiment, the virus of the boost is an adenovirus, a vaccinia virus, measles virus, or a vesicular stomatitis virus.
In one embodiment, the virus of the boost is an adenovirus, a vaccinia virus, or a vesicular stomatitis virus.
In one embodiment, the boost is formulated for intravenous, intramuscular, or intratumoral administration.
In one embodiment, the prime is formulated for intravenous, intramuscular, or intratumoral administration.
In one embodiment, the virus of the boost is inactivated. In one embodiment, the virus of the boost is UV-inactivated.
In one embodiment, the prime additionally comprises a non-viral immunologic adjuvant. One example is polyl:C.
In one embodiment, the prime additionally comprises a virus, wherein the virus of the prime is immunologically distinct from the virus of the boost.
In one embodiment, the virus of the prime is an adenovirus. The virus of the prime may be tumour selective. For example, the adenovirus of the prime may comprise a deletion in E1 and E3, rendering the virus susceptible to p53 inactivation. Since many tumours lack p53, such a modification effective renders the virus tumour-specific, and hence oncolytic. In one embodiment, the adenovirus is of serotype 5.
The virus of the prime may encode the at least one antigenic protein of the prime. Where multiple antigenic proteins are used in the prime, some or all of them may be encoded by the virus of the prime. For example, the virus of the prime may comprise a plurality of virus types, each type being engineered to encode one of the antigenic proteins. However, in one embodiment, the at least one antigenic protein of the prime is/are not encoded by the virus of the prime. Where a plurality of antigenic proteins are used, in one embodiment none of them will be encoded by the virus of the prime.
In one embodiment, the virus of the prime may be attenuated. In one embodiment, wherein the virus of the prime is inactivated. In one embodiment, the virus of the prime is UV inactivated.
In one embodiment, the at least one antigenic protein of the prime comprises a synthetic peptide. In one embodiment, the synthetic peptide of the prime is a synthetic long peptide (SLP). The at least one antigenic protein of the prime may be 8 to 250 amino acids in length. Within this range, it may at least 10, at least 20, at least 30, at least 40, or at least 50 amino acids in length. With all these applicable ranges, may be less than 200, less than 150, less than 125, less than 100, less than 75, less than 50, less than 40, or less than 30 amino acids in length. Any combination of the stated upper and lower limits is envisaged.
In one embodiment, the at least one antigenic protein of the boost comprises a synthetic peptide. In one embodiment, the synthetic peptide of the boost is a synthetic long peptide (SLP). The at least one antigenic protein of the boost may be 8 to 250 amino acids in length. Within this range, it may at least 10, at least 20, at least 30, at least 40, or at least 50 amino acids in length. With all these applicable ranges, may be less than 200, less than 150, less than 125, less than 100, less than 75, less than 50, less than 40, or less than 30 amino acids in length. Any combination of the stated upper and lower limits is envisaged.
The composition for use may additionally include an immune-potentiating compound, such as cyclophosphamide (CPA), that increases the prime immune response to the tumour associated antigenic protein generated in the mammal by administrating the first virus. Cyclophosphamide is a chemotherapeutic agent that may lead to enhanced immune responses against the tumour associated antigenic protein.
In certain embodiments, the antigenic proteins are not attached, conjugated, or otherwise physically connected to the viral particles. In some embodiments, the antigenic proteins are not physically associated with the viral particles.
Kits for Inducing an Immune Response to a Tumour
In one aspect, there is provide a kit for use in inducing an immune response in a mammalian subject, wherein the kit comprises a prime comprising at least one antigenic protein, formulated to generate the immune response in the mammal; and a boost comprising a virus and at least one antigenic protein, formulated to induce the immune response in the mammal; wherein the at least one antigenic protein of the prime and the at least one antigenic protein of the boost are based on the same at least one tumour associated antigen, and wherein the at least one antigenic protein of the boost is not encoded by the virus of the boost.
In one embodiment, the mammal may be a human.
In one embodiment, the at least one antigenic protein of the prime and the at least one antigenic protein of the boost are the same.
In one embodiment, the at least one tumour associated antigen is based on the mutanome of a tumour of the mammalian subject.
In one embodiment, the at least one antigenic protein of the prime comprises a plurality antigenic proteins, and the at least one antigenic protein of the boost comprises a plurality of antigenic proteins, each of which is not encoded by the virus of the boost, and the plurality of antigenic proteins of the prime and the plurality of antigenic proteins of the boost are based on the same plurality of tumour associated antigens. As above, it will be appreciated that plurality of antigenic proteins of the prime and the plurality of antigenic proteins of the boost need not be the same, and that pairs of antigenic proteins from the prime and boost may elicit an immune response to the same tumour associated antigen without being the same. For instance, the pairs may be partially overlapping, with the overlapping segment comprising a sequence corresponding to the tumour associated antigen, or a sequence designed to elicit an immune response to the tumour associated antigen. However, in one embodiment, the plurality of antigenic proteins of the prime and the plurality of antigenic proteins of the boost are the same.
In one embodiment, the plurality of tumour associated antigens are based on the mutanome of a tumour the mammalian subject.
In one embodiment, the virus of the boost is an oncolytic virus.
In one embodiment, the virus of the boost is a Rhabdovirus. The Rhabdovirus may be any of those listed above.
In one embodiment, the Rhabdovirus is a Maraba virus or an engineered variant thereof.
In one embodiment, the virus of the boost is an attenuated virus.
In one embodiment, the attenuated virus is an attenuated Maraba virus comprising a Maraba G protein in which amino acid 242 is mutated, and a Maraba M protein in which amino acid 123 is mutated. In one embodiment, amino acid 242 of the G protein is arginine (Q242R), and the amino acid 123 of the M protein is tryptophan (L123W). An example of the Maraba M protein is described in PCT Application No. PCT/IB2010/003396, wherein it is referred to as SEQ ID NO: 4. An example of the Maraba G protein is described PCT Application No. PCT/IB2010/003396, wherein it is referred to as SEQ ID NO: 5. In one embodiment, the virus of the boost is the Maraba double mutant (“Maraba DM”) described in PCT Application No. PCT/IB2010/003396. In one embodiment, the virus of the boost is the “Maraba MG1” described in PCT Application No. PCT/CA2014/050118.
In one embodiment, the virus of the boost is an adenovirus, a vaccinia virus, measles virus, or a vesicular stomatitis virus.
In one embodiment, the virus of the boost is an adenovirus, a vaccinia virus, or a vesicular stomatitis virus.
In one embodiment, the boost is formulated for intravenous, intramuscular, or intratumoral administration.
In one embodiment, the prime is formulated for intravenous, intramuscular, or intratumoral administration.
In one embodiment, the virus of the boost is inactivated. In one embodiment, the virus of the boost is UV-inactivated.
In one embodiment, the prime additionally comprises a non-viral adjuvant.
In one embodiment, the prime additionally comprises a virus, wherein the virus of the prime is immunologically distinct from the virus of the boost.
In one embodiment, the virus of the prime is an adenovirus. The virus of the prime may be tumour selective. For example, the adenovirus of the prime may comprise a deletion in E1 and E3, rendering the virus susceptible to p53 inactivation. Since many tumours lack p53, such a modification effective renders the virus tumour-specific, and hence oncolytic.
The virus of the prime may encode the at least one antigenic protein of the prime. Where multiple antigenic proteins are used in the prime, some or all of them may be encoded by the virus of the prime. For example, the virus of the prime may comprise a plurality of virus types, each type being engineered to encode one of the antigenic proteins. However, in one embodiment, the at least one antigenic protein of the prime is/are not encoded by the virus of the prime. Where a plurality of antigenic proteins are used, in one embodiment none of them will be encoded by the virus of the prime.
In one embodiment, the virus of the prime may be attenuated. In one embodiment, wherein the virus of the prime is inactivated. In one embodiment, the virus of the prime is UV inactivated.
In one embodiment, the at least one antigenic protein of the prime comprises a synthetic peptide. In one embodiment, the synthetic peptide of the prime is a synthetic long peptide. The at least one antigenic protein of the prime may be 8 to 250 amino acids in length. Within this range, it may at least 10, at least 20, at least 30, at least 40, or at least 50 amino acids in length. With all these applicable ranges, may be less than 200, less than 150, less than 125, less than 100, less than 75, less than 50, less than 40, or less than 30 amino acids in length. Any combination of the stated upper and lower limits is envisaged.
In one embodiment, the at least one antigenic protein of the boost comprises a synthetic peptide. In one embodiment, the synthetic peptide of the boost is a synthetic long peptide. The at least one antigenic protein of the prime may be 8 to 250 amino acids in length. Within this range, it may at least 10, at least 20, at least 30, at least 40, or at least 50 amino acids in length. With all these applicable ranges, may be less than 200, less than 150, less than 125, less than 100, less than 75, less than 50, less than 40, or less than 30 amino acids in length. Any combination of the stated upper and lower limits is envisaged.
The kit may additionally include an immune-potentiating compound, such as cyclophosphamide (CPA), that increases the prime immune response to the tumour associated antigenic protein generated in the mammal by administrating the first virus. Cyclophosphamide is a chemotherapeutic agent that may lead to enhanced immune responses against the tumour associated antigenic protein.
In certain embodiments, the antigenic proteins are not attached, conjugated, or otherwise physically connected to the viral particles. In some embodiments, the antigenic proteins are not physically associated with the viral particles.
Therapeutic Prime:Boost Uses and Methods for Cancer
In one aspect, there is provided a use of the combination prime:boost therapy herein described for treatment of a tumour in a mammalian subject.
In one aspect, there is provided a combination prime:boost therapy herein described for use in treatment of a tumour in a mammalian subject.
In one aspect, there is provided a method of treating a tumour in a mammalian subject, the method comprising administering to the subject the combination prime:boost herein described.
In one aspect, there is provided a use of the composition for use, as defined above, for treatment of a tumour in a mammalian subject.
In one aspect, there is provided the composition for use, as defined above, in treatment of a tumour in a mammalian subject.
Production Methods
In one aspect, there is provided a method for producing the combination prime:boost therapy herein described, the method comprising synthesizing the at least one antigenic protein of the boost, and producing the combination prime:boost therapy.
In one aspect, there is provided a method for producing the combination prime:boost therapy herein described, the method comprising synthesizing the at least one antigenic protein of the prime, and producing the combination prime:boost therapy.
In one embodiment, the step of synthesizing comprises long peptide synthesis.
In one embodiment, the method further comprising, prior to the step of synthesizing, selecting the at least one tumour associated antigen based on the mutanome of the tumour of the mammalian subject.
In one embodiment, the method may also comprise determining the mutanome for a subject to determine unique peptides. Once determined, some embodiments include selecting target peptides from the mutanome. Some embodiments comprise predicting optimal targets, e.g. based on predicted antigenicity.
Uses for Adjuvanting an Immune Response
In one aspect, there is provided a use of an oncolytic virus and at least one antigenic protein for inducing an immune response in a mammalian subject, wherein the at least one antigenic protein is not encoded by the oncolytic virus.
In one aspect, there is provided an oncolytic virus and at least one antigenic protein for use in inducing an immune response in a mammalian subject, wherein the at least one antigenic protein is not encoded by the oncolytic virus.
In one aspect, there is provided a use of an oncolytic virus for adjuvanting an immune response to at least one antigenic protein in a mammalian subject, wherein the at least one antigenic protein is not encoded by the oncolytic virus.
In one aspect, there is provided an oncolytic virus for use in adjuvanting an immune response to at least one antigenic protein in a mammalian subject, wherein the at least one antigenic protein is not encoded by the oncolytic virus.
In one embodiment, the mammal is a human.
In one embodiment, the immune response is a therapeutic immune response.
In one embodiment, the mammalian subject has pre-existing immunity to the at least one antigenic protein.
“Pre-existing immunity” will be understood as a subject who is not naïve to a particular antigen, having previously been exposed to it. This may arise, for example, due to priming the subject with the antigen. It may also arise because the subject has low-level immunity because the antigen is present in the subject. For example, in the context of cancer, a subject may have low level prior immunity because of a tumour associated antigen is expressed by the tumour.
In one embodiment, the at least one antigenic protein is based on at least one tumour associated antigen.
In one embodiment, the at least one tumour associated antigen is based on the mutanome of a tumour the mammalian subject.
In one embodiment, the at least one antigenic protein comprises a plurality antigenic proteins.
In one embodiment, the plurality of antigenic proteins are based on the mutanome of a tumour the mammalian subject.
In one embodiment, the oncolytic virus is a Rhabdovirus. The Rhabdovirus may be any of those listed above.
In one embodiment, the Rhabdovirus is a Maraba virus or an engineered variant thereof.
In one embodiment, the oncolytic virus is an attenuated virus.
In one embodiment, the attenuated virus is an attenuated Maraba virus comprising a Maraba G protein in which amino acid 242 is mutated, and a Maraba M protein in which amino acid 123 is mutated. In one embodiment, amino acid 242 of the G protein is arginine (Q242R), and the amino acid 123 of the M protein is tryptophan (L123W). An example of the Maraba M protein is described in PCT Application No. PCT/IB2010/003396, wherein it is referred to as SEQ ID NO: 4. An example of the Maraba G protein is described PCT Application No. PCT/IB2010/003396, wherein it is referred to as SEQ ID NO: 5. In one embodiment, the virus of the boost is the Maraba double mutant (“Maraba DM”) described in PCT Application No. PCT/IB2010/003396. In one embodiment, the virus of the boost is the “Maraba MG1” described in PCT Application No. PCT/CA2014/050118.
In one embodiment, the virus is an adenovirus, a vaccinia virus, measles virus, or a vesicular stomatitis virus.
In one embodiment, the virus of the boost is an adenovirus, a vaccinia virus, or a vesicular stomatitis virus.
In one embodiment, the virus and the at least one antigenic protein are formulated for intravenous, intramuscular, or intratumoral administration.
In one embodiment, the virus is inactivated.
In one embodiment, virus is UV-inactivated.
In one embodiment, the at least one antigenic protein comprises a synthetic peptide. In one embodiment, synthetic peptide comprises a long synthetic peptide. The at least one antigenic protein may be 8 to 250 amino acids in length. Within this range, it may at least 10, at least 20, at least 30, at least 40, or at least 50 amino acids in length. With all these applicable ranges, may be less than 200, less than 150, less than 125, less than 100, less than 75, less than 50, less than 40, or less than 30 amino acids in length. Any combination of the stated upper and lower limits is envisaged.
Methods of Adjuvanting
In one aspect, there is provided a method of adjuvanting an immune response to at least one antigenic protein in a mammalian subject, the method comprising administering to the subject an oncolytic virus and the at least one antigenic protein, wherein the at least one antigenic protein is not encoded by the oncolytic virus.
In one embodiment, the mammal is a human.
In one embodiment, the step of administering comprises co-administering.
In one embodiment, the immune response is a therapeutic immune response.
In one embodiment, the mammalian subject has pre-existing immunity to the at least one antigenic protein.
In one embodiment, the at least one antigenic protein is based on at least one tumour associated antigen.
In one embodiment, the at least one tumour associated antigen is based on the mutanome of a tumour the mammalian subject.
In one embodiment, the at least one antigenic protein comprises a plurality antigenic proteins.
In one embodiment, the plurality of antigenic proteins are based on the mutanome of a tumour the mammalian subject.
In one embodiment, the oncolytic virus is a Rhabdovirus. The Rhabdovirus may be any of those listed above.
In one embodiment, the Rhabdovirus is a Maraba virus or an engineered variant thereof.
In one embodiment, the virus is an attenuated virus.
In one embodiment, the attenuated virus is an attenuated Maraba virus comprising a Maraba G protein in which amino acid 242 is mutated, and a Maraba M protein in which amino acid 123 is mutated. In one embodiment, amino acid 242 of the G protein is arginine (Q242R), and the amino acid 123 of the M protein is tryptophan (L123W). An example of the Maraba M protein is described in PCT Application No. PCT/IB2010/003396, wherein it is referred to as SEQ ID NO: 4. An example of the Maraba G protein is described PCT Application No. PCT/IB2010/003396, wherein it is referred to as SEQ ID NO: 5. In one embodiment, the virus of the boost is the Maraba double mutant (“Maraba DM”) described in PCT Application No. PCT/IB2010/003396. In one embodiment, the virus of the boost is the “Maraba MG1” described in PCT Application No. PCT/CA2014/050118.
In one embodiment, the virus is an adenovirus, a vaccinia virus, measles virus, or a vesicular stomatitis virus.
In one embodiment, the virus of the boost is an adenovirus, a vaccinia virus, or a vesicular stomatitis virus.
In one embodiment, the step of administering is intravenous, intramuscular, or intratumoral.
In one embodiment, the virus is inactivated.
In one embodiment, the virus is UV-inactivated.
In one embodiment, the at least one antigenic protein comprises a synthetic peptide. In one embodiment, the synthetic peptide comprises a long synthetic peptide. The at least one antigenic protein may be 8 to 250 amino acids in length. Within this range, it may at least 10, at least 20, at least 30, at least 40, or at least 50 amino acids in length. With all these applicable ranges, may be less than 200, less than 150, less than 125, less than 100, less than 75, less than 50, less than 40, or less than 30 amino acids in length. Any combination of the stated upper and lower limits is envisaged.
Immunogenic Compositions
In one aspect, there is provided an immunogenic composition comprising an oncolytic virus and at least one antigenic protein, wherein the at least one antigenic protein is not encoded by the oncolytic virus.
In one embodiment, the at least one antigenic protein is based on at least one tumour associated antigen.
In one embodiment, the at least one tumour associated antigen is based on the mutanome of a tumour a mammalian subject.
In one embodiment, the at least one antigenic protein comprises a plurality antigenic proteins.
In one embodiment, the plurality of antigenic proteins are based on the mutanome of a tumour the mammalian subject.
In one embodiment, the oncolytic virus is a Rhabdovirus. The Rhabdovirus may be any of those listed above.
In one embodiment, the Rhabdovirus is a Maraba virus or an engineered variant thereof.
In one embodiment, the virus is an attenuated virus.
In one embodiment, the attenuated virus is an attenuated Maraba virus comprising a Maraba G protein in which amino acid 242 is mutated, and a Maraba M protein in which amino acid 123 is mutated. In one embodiment, amino acid 242 of the G protein is arginine (Q242R), and the amino acid 123 of the M protein is tryptophan (L123W). An example of the Maraba M protein is described in PCT Application No. PCT/IB2010/003396, wherein it is referred to as SEQ ID NO: 4. An example of the Maraba G protein is described PCT Application No. PCT/IB2010/003396, wherein it is referred to as SEQ ID NO: 5. In one embodiment, the virus of the boost is the Maraba double mutant (“Maraba DM”) described in PCT Application No. PCT/IB2010/003396. In one embodiment, the virus of the boost is the “Maraba MG1” described in PCT Application No. PCT/CA2014/050118.
In one embodiment, the virus is an adenovirus, a vaccinia virus, measles virus, or a vesicular stomatitis virus.
In one embodiment, the virus of the boost is an adenovirus, a vaccinia virus, or a vesicular stomatitis virus.
In one embodiment, the virus is inactivated.
In one embodiment, the virus is UV-inactivated.
In one embodiment, the at least one antigenic protein comprises a synthetic peptide. In one embodiment, the synthetic peptide comprises a long synthetic peptide. The at least one antigenic protein may be 8 to 250 amino acids in length. Within this range, it may at least 10, at least 20, at least 30, at least 40, or at least 50 amino acids in length. With all these applicable ranges, may be less than 200, less than 150, less than 125, less than 100, less than 75, less than 50, less than 40, or less than 30 amino acids in length. Any combination of the stated upper and lower limits is envisaged.
Cell Lines and Culture
B16F10 stably expressing ovalbumin were obtained from Dr. Rebecca Auer. Vero, HEK 293T and HeLa cells were all obtained from the American Type Culture Collection (ATCC). The cell lines were maintained in Dulbecco's Modified Eagle's Medium (DMEM) (Corning Cellgro) supplemented with 10% fetal bovine serum (FBS) (Sigma Life Science) and cultured at 37oC with 5% CO2.
Viruses, Production and Quantification
The Maraba (MRB) virus used in this study is the clinical candidate variant MG1, such that in the ensuing text reference to ‘MRB’ should be understood as meaning MG1. The Vesicular stomatitis virus (VSV) used in this study is the mutant Δ51. Production and purification of VSV and MRB: Vero cells were infected at a multiplicity of infection (MOI) of 0.01 for 24 hours before harvesting, filtration [0.22 μm bottle top filter (Millipore)], and centrifugation (90 minutes at 30100 g) of the culture supernatant. The pellet was resuspended in Dulbecco's phosphate buffered saline (DPBS) (Corning
Cellgro) and stored at −80oC. Viral titers were determined by plaque assay. Briefly, serially diluted samples were transferred to monolayers of Vero cells, incubated for 1 hour, and then overlaid with 0.5% agarose/DMEM supplemented with 10% FBS. Plaques were counted 24 hours later.
The Adenoviruses (Ad) used in this study (Ad, Ad-Ova and Ad-DCT) were all obtained from B. Lichty (all serotype E5). Production and purification of Ad: HEK 293T cells were infected at an MOI of 1 for 48 h in DMEM supplemented with 2% FBS. The infected cells were then collected and the pellet was frozen and thawed for 3 cycles. The debris were then removed by centrifugation and the cleared supernatant was centrifugated on a cesium chloride gradient (1.4 g/cm3 CsCl-1.2 g/cm3 CsCl) at 28000 rmp for 3.5 h at 4oC. The band corresponding to the Ad particles was then extracted and the virus was stored at −20oC. Viral titers were obtained using the Adeno-X rapid titer kit according to the manufacturer's protocol (Takara).
The vaccinia virus (VV) used in this study is the wild type Copenhagen strain.
The measles virus (MV) used in this study (Schwarts strain) expressed GFP and was a generous gift from Dr. Guy Ungerechts.
Irradiated Virus
Maraba was UV-inactivated by exposure to 120 mJ/cm2 for 2 minutes using a Spectrolinker XL-1000 UV crosslinker as described previously (35).
Flow Cytometry
Spleens were harvested and mashed through a 70 μm strainer (Fisher Scientific) before lysis of red blood cells using ACK lysis buffer and resuspension in FACS buffer (PBS, 3% FBS). The splenocytes were re-stimulated ex-vivo using 2 μg/mL of the corresponding peptide and golgi-plug (BD Bioscience) was added to the mixture after 1 h for an additional 5 h in order to prevent cytokine secretion. Cells were stained using CD45, CD3, CD8, TNFα and IFNγ antibodies (all from BD Bioscience). The intracellular stainings were performed upon fixation and permeabilization of the cells (using the intracellular fixation and permeabilization buffer set (eBioscience)). Flow cytometry analysis was performed on a LSR Fortessa flow cytometer (BD biosciences).
Peptides
All peptides were obtained from Biomer Technology and have the amino acid sequences shown in Table 1.
ELISPOT
Mouse IFNγ ELISPOTs (MabTech) were performed according to the manufacturer's protocol using splenocytes extracted 7 days after the last immunization. The incubation was performed for 24 h in serum-free DMEM using 2 μg/mL of peptide for re-stimulation.
In Vivo Experiments and Tumour Models
All experiments were performed in accordance with the University of Ottawa ACVS guidelines. Subcutaneous tumour model: 106 or 105 B16F10-Ova cells were injected into the left flank or IV of 6-8 weeks old female C57/BI6 mice for the SC and the lung cancer model, respectively (Charles River Laboratories). For the CT26 SC tumour model, 106 cells were injected into the left flank of Balb/c mice (Charles River Laboratories). Ad (1×108 PFU) was administered intramuscularly in the quadriceps and MRB, VSV, MV and VV (all at a dose of 1×108 PFU) were administered intravenously (unless specified otherwise) via the tail vein of the mice. Polyl:C was purchased from Invivogen and a dose of 50 ug was used per animal per immunization. The peptides (100 ug/mouse/immunization) were pre-mixed with the different viruses or with polyl:C prior to injection in a total volume of 100 uL. Immune priming and boosting were performed 7 and 14 days post-tumour seeding and the immune analysis was performed 7 days after the last immunization. For the experiment using several peptides (
Results and Discussion
In these experiments MRB indicates MG1. All experiments were done is tumour-bearing animals. The prime is to be understood as immunization at day 7, and the boost took place at day 14.
The results indicate that it is not necessary for the antigenic protein to be encoded by the virus to stimulate an immune response.
The viruses can be used as an adjuvant for immune boosting.
The results of
Other oncolytic viruses (OVs) can also be used as adjuvants for immune priming or boosting.
MRB can be used as an adjuvant together with mutanome epitopes.
CT26Mut37) (day 7) and boosted with MRB or MRB co-administered with mutanome peptides (CT26Mut20, CT26Mut27 and CT26Mut37) (day 14). The results show that Ad and MRB co-administered with mutanome peptides can control the growth of the SC tumors. Stats: NS: p>0.05, ***: p<0.001 (unpaired two-tailed t-test).
In the preceding description, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the embodiments. However, it will be apparent to one skilled in the art that these specific details are not required. In other instances, well-known electrical structures and circuits are shown in block diagram form in order not to obscure the understanding. For example, specific details are not provided as to whether the embodiments described herein are implemented as a software routine, hardware circuit, firmware, or a combination thereof.
Embodiments of the disclosure can be represented as a computer program product stored in a machine-readable medium (also referred to as a computer-readable medium, a processor-readable medium, or a computer usable medium having a computer-readable program code embodied therein). The machine-readable medium can be any suitable tangible, non-transitory medium, including magnetic, optical, or electrical storage medium including a diskette, compact disk read only memory (CD-ROM), memory device (volatile or non-volatile), or similar storage mechanism. The machine-readable medium can contain various sets of instructions, code sequences, configuration information, or other data, which, when executed, cause a processor to perform steps in a method according to an embodiment of the disclosure. Those of ordinary skill in the art will appreciate that other instructions and operations necessary to implement the described implementations can also be stored on the machine-readable medium. The instructions stored on the machine-readable medium can be executed by a processor or other suitable processing device, and can interface with circuitry to perform the described tasks.
The above-described embodiments are intended to be examples only. Alterations, modifications and variations can be effected to the particular embodiments by those of skill in the art. The scope of the claims should not be limited by the particular embodiments set forth herein, but should be construed in a manner consistent with the specification as a whole.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CA2019/050220 | 2/22/2019 | WO | 00 |
| Number | Date | Country | |
|---|---|---|---|
| 62751091 | Oct 2018 | US | |
| 62633883 | Feb 2018 | US |
