Patent Application
20140113388
The following generally relates to treatment planning and more particularly to creating and/or adapting a treatment plan for a patient based on a set of polypeptide serum markers of the patient that can be used to predict, early detect, and/or monitor radiotoxicity of the patient induced by radiation from radiotherapy.
Generally, events occurring in the body are molecularly mediated, mostly by proteins. Ongoing physiological or pathological events are represented by the relative cellular abundance of tens of thousands of different proteins along with their chemically modified and cleaved forms. Every cell gives an account of its physiological state in the molecular products it contains and releases. Within molecular diagnostics (MDx), some of the cellular products from this diagnostic information mine are used as disease markers or as pathological fingerprints. The outcome of such tests may be important input for any decision support tool that combines diagnosis and disease prognosis.
Mass spectrometry (MS) is a method for determining molecular mass, involving sample ionization and transfer to the gas phase. By acceleration in an electric field and separation in vacuum, the molecular ions are separated according to their mass-to-charge ratio. During the last decades, MS has proven to be a viable technique for accurate and sensitive analysis of biological species like proteins and peptides. With the introduction of soft ionization techniques, it became possible to transfer these non-volatile, large, and thermally labile molecules into the gas phase without dissociating them.
In matrix-assisted laser desorption ionization (MALDI), the sample is co-crystallized with a UV absorbing aromatic compound which is added to the sample in large excess. Common UV absorbing matrices include a-cyano-4-hydroxy cinnamic acid (CHCA) and 3,5-dimethoxy-4-hydroxy cinnamic acid (sinapinic acid). A pulsed UV laser supplies the energy for ionization and desorption, and the matrix absorbs the UV energy and transfers it to the sample. Typically, a N2 laser with 337 nm wavelength (3.7 eV) and e.g., 4 ns pulses is used. As comparison, about 13-14 eV is required for one ˜12 kDa (Dalton) molecule to be desorbed and ionized. Using MALDI-MS, molecules with masses exceeding 105 Da can be ionized and analyzed without appreciable fragmentation.
Prior to performing MALDI-MS, complex samples like molecular digests, cell lysates and blood serum have to be pre-fractionated in order to eliminate the suppression of molecular desorption/ionization often observed with complex mixtures (ion suppression), to avoid too heterogeneous sample compositions and to avoid detector overload. Common pre-fractionation methods include liquid chromatography, electrophoresis, isoelectric focusing, desalting, and removal of particles by centrifugation, as well as concentration and dilution. Often, 2D gel electrophoresis is performed; spots of interests are excised from the gel and dissolved for subsequent MALDI-MS analysis. Another common arrangement is liquid chromatography (LC) coupled directly to another type of mass spectrometer with electrospray ionization (ESI-MS), corresponding to a low-resolution mass separation (LC) in series with a high-resolution mass separation (MS).
MALDI was further refined by introduction of a combination with chromatographic sample pre-fractionation in surface-enhanced affinity capture (SEAC), later surface enhanced laser desorption ionization (SELDI), and by covalent binding of matrix to the sample holding plate in an approach called surface-enhanced neat desorption (SEND). In SELDI, the sample is brought into contact with a chromatographic surface which binds a subgroup of the sample molecules. For sample preparation, individual chromatographic chips are accommodated in a special holder (a bio-processor) to achieve a standard microtiter plate format. Unbound molecules are removed by buffer washing, and a MALDI-MS measurement is performed directly off the chromatographic surface. Matrix is either added as a last step before MS measurement, or is already covalently bound to the chip surface. Only little or no fragmentation is observed.
As an example, when using a hydrophobic surface in SELDI, the subgroup of hydrophobic molecules will be fished out of a complex sample. For biomarker discovery, protein expression profiling, and diagnostic purposes, this is useful for investigation or diagnosis of diseases which lead to a change in the expression of hydrophobic peptides. SELDI advantages include that the sample is concentrated directly on a chromatographic surface in a relatively short process with high throughput potential. The chromatographic MS targets can be automatically loaded with a sample, prepared, and analyzed in the MS. Therefore, the method is interesting for diagnostic applications. The SELDI-TOF mass spectrometers have a simple design and are installed in many clinics and clinical chemistry departments of hospitals.
From blood serum, diagnostic mass spectrometric proteomic patterns showing e.g. early cancer or host response to radiation can be obtained. The literature has indicated that such a diagnostic peptide pattern has enabled early diagnosis of ovarial cancer. The approach of a spectral pattern as a diagnostic discriminator represented a new diagnostic paradigm. For the first time, the pattern itself was the discriminator, independent of the identity of the proteins or peptides. The underlying thesis was that pathological changes within an organ are reflected in proteomic patterns in serum. This is plausible because, generally speaking, and as stated in the opening paragraph, every event occurring in our bodies is molecularly mediated, mostly by proteins.
Tumors are often treated with radiotherapy. In radiotherapy, a radiation dose high enough to kill tumor cells is delivered to the tumor, while trying to spare healthy tissue surrounding the tumor and extra sensitive tissue like epithelial linings, rectum, bowel, urethra, bladder and certain nerve bundles. In external beam radiotherapy, there are always portions of healthy tissue that are exposed to and damaged by radiation. In addition, some patients react with severe side-effects, which have a severe influence on the patient's quality of life. By way of non-limiting example, acute and late toxicity of the bowel and the urinary tract are impeding side-effects in radiotherapy of prostate cancer. With this cancer, radiotherapy planning targets the prostate cancer while minimizing dose to the very closely situated bowel and bladder. The frequent and serious side-effects of prostate cancer radiotherapy especially affect the bladder and the bowel. For example, the side-effects include incontinence, bleeding, pain, etc. Other side-effects include impotence. Other cancers in this bodily region treated using radiotherapy include, but are not limited to, bladder, kidney, bowel, rectum, endometrial, cervix, ovarial or vaginal cancer. With all of these, there may be severe side-effects that may influence the patient's quality of life.
To measure health related quality of life among men with prostate cancer, the Expanded Prostate cancer Index Composite (EPIC) was developed. EPIC consists of a questionnaire that is manually filled out by patients at several time points before, during and after radiotherapy. It assesses the disease-specific aspects of prostate cancer and its therapies and comprises the four summary domains: urinary, bowel, sexual and hormonal. Generally, higher EPIC scores are indicative of a better health-related quality of life. EPIC is a valuable tool for standardized assessment of radiotherapy side-effects and how these effects are perceived by the individual patients. However, EPIC can only report subjectively experienced effects. Furthermore, as with all patient-reported questionnaires, EPIC provides no reliable objective measure of side-effects. Because of at least these drawbacks, EPIC is not well suited to assist in individualization of treatment planning.
Aspects of the present application address the above-referenced matters, and others.
In one aspect, a method includes at least one of creating or adapting a treatment plan for a patient based on a set of serum polypeptides of the patient that are indicative of a radiotoxicity of the patient at least one of before or after at least one of a plurality of radiotherapy treatments of the treatment plan, wherein the radiotoxicity is induced by radiation exposure from the radiotherapy treatment.
In another aspect, a system includes a treatment planning device (108) that facilitates at least one of creating or adapting a treatment plan for a patient based amounts or concentrations of a set of serum polypeptides of the patient that indicate a high risk of or an early radiotoxicity of the patient to radiation from radiotherapy.
In another aspect, computer readable storage medium is encoded with computer readable instructions, which, when executed by a processor of a computing system, causes the system to: receive information about a polypeptide of a patient that indicates a radiotoxicity of the patient to radiotherapy treatment and create or adapt a treatment plan for the patient based on the received information, wherein the information includes at least a mass of the polypeptide and an intensity peak of the polypeptide.
Still further aspects of the present invention will be appreciated to those of ordinary skill in the art upon reading and understanding the following detailed description.
The invention may take form in various components and arrangements of components, and in various steps and arrangements of steps. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
The following describes an approach for creating and/or adapting a treatment plan for a patient based on serum concentrations/amounts of a predetermined set of polypeptides of the patient that indicate a radiotoxicity of the patient to radiation from radiotherapy.
Initially referring to
When predicting radiotoxicity, the serum sample is obtained from the patient prior to radiotherapy, and the prediction can be used to select treatment therapies and create a treatment plan, which may or may not include radiotherapy. For monitoring radiotoxicity, one or more serum samples are obtained respectively during radiotherapy treatment (e.g., after a first, a second, etc. of several scheduled radiotherapy treatments), and the monitored radiotoxicity can be used to adapt the created treatment plan (adaptive re-planning).
A marker identifier 104 is configured to analyze the data generated by the sample processor 102 and identify a sub-set of the polypeptides of the serum sample that correspond to a set of polypeptide radiotoxicity bio-markers of interest. The set of polypeptide radiotoxicity bio-markers of interest are identified based on bio-marker identification criteria 106. In this example, the identification criteria 106 includes polypeptides with masses of 11,668±23 Da, 2,876±6 Da, 6,432±13 Da, 9,125±18 Da, 2,220±4 Da, 9,414±19 Da, and 14,571±29 Da.
It is to be understood that as utilized herein the term “identify,” in the context of the marker identifier 104, refers to identifying bio-markers that have a mass of interest from the criteria 106 from bio-markers that have a mass other than a mass of interest from the criteria 106. Other sets of masses and/or criteria are also contemplated herein. The particular set of criteria 106 can be determined theoretically, empirically, based on previously implemented treatment plans, etc. The bio-marker identifier 104 generates an electronic signal that includes the identified set of polypeptides, along with data such as their masses, peak signal intensity, etc.
Where the serum sample is processed via an immunoassay, marker identifier 104 can be omitted because the assay tests bind to already pre-determined antibodies (i.e., the type of antibodies are on the assay determines which biomarkers are measured).
A treatment planning device 108 is configured to create and/or adapt treatment plans, with or without human interaction, at least based on the signal generated by the bio-marker identifier 104, which includes the identified set of polypeptide radiotoxicity markers along with data such as their masses, peak intensity, etc., and one or more algorithms 109, including treatment identification algorithms 110, optimization algorithms 112, and/or other algorithms. Generally, treatment plan creation includes creating a treatment plan to be implemented and treatment plan adaption includes modifying a treatment plan being implemented. The algorithms 109 can be used with both treatment plan creation and treatment plan adaption.
The illustrated treatment planning device 108 includes a treatment identifier 111 configured to employ the treatment identification algorithms 110 to identify a set of treatments for the plan based on the identified set of polypeptide radiotoxicity markers. Suitable treatments include one or more of external beam radiotherapy, low dose rate (LDR) and/or high dose rate (HDR) brachytherapy, surgery, chemotherapy, particle (e.g., proton) therapy, high intensity focused ultrasound (HIFU), ablation, hormonal therapy, cryotherapy, watchful waiting, and/or other treatments.
The treatment planning device 108 can automatically select and include the identified set of treatments in the plan or recommend the identified set of treatments for the plan to facilitate a user with selecting treatments for the plan. As such, the treatment planning device 108 can be part of or used in connection with a clinical decision support system or a computer aided diagnosis/treatment system.
In one non-limiting embodiment, the identification algorithms 110 compare, for each polypeptide of the identified set of polypeptide radiotoxicity bio-markers, the intensity peak with a corresponding pre-determined intensity threshold value of predetermined intensity thresholds 115. Comparisons at particular radiotherapy time points (e.g., before and/or after one or more radiotherapy treatments) and/or patterns across all or a sub-set of the time points can be used to classify the polypeptide radiotoxicity markers as indicating the patient has higher or lower radiotoxicity based on the thresholds 115. In turn, the treatment identifier 111 can classify a patient as extra radiosensitive or not based on a combination of the polypeptide classifications, and subsequently the treatments in the plan can be personalized for the patient.
The treatment planning device 108 also includes an optimizer 113 configured to employ the optimization algorithms 112 to optimize a treatment (e.g., an external beam radiotherapy treatment) of the plan and/or the treatment plan based on a set of optimization rules 117. The rules 117 may include modifying parameters of one or more of the treatments of the treatment plan. For example, where the set of polypeptide radiotoxicity markers indicate a patient is extra radiosensitive, the rules 117 may indicate that an extra radiation dose boost, which might be beneficial to treating a tumor, should not be performed, extra strict dose limits should be applied for the patient, a change to another treatment of the plan in substitution to the extra radiation dose boost, a modification to a dose distribution contour should be made, etc. As such, individual treatments can be personalized to the patient based on the polypeptide radiosensitivity bio-markers.
The identified set of treatments, the treatments treatment plan, the peak intensity information of the polypeptides, the intensity thresholds 115, the classification of the polypeptides (e.g., as indicating higher or lower radiosensitivity), the classification of the patient (e.g., as having higher or lower radiosensitivity), and/or other information can be visually presented via a display, for example, for confirmation, observation, and/or notification to authorized personnel, printed, stored in computer memory, and/or otherwise processed. This information can be variously formatted such as a table or a graph, as a toxicity index for the patient, and/or otherwise. The data can be colored coded or otherwise visually emphasized or highlighted in order to bring certain information (e.g., the patient is extra radiosensitive) to the user of the treatment planning device 108. The user of the device 108 can utilize all, any of the above-noted and/or other information to create and/or adapt a treatment plan.
A therapy treatment system 114, in the illustrated embodiment, is configured to receive and process the treatment plan from the treatment planning device 108. Examples of suitable therapy treatment systems, include, but are not limited to, an external beam radiation therapy system, a device that facilitates chemotherapy administration, a device that facilitates brachytherapy seed implantation, a particle (e.g., proton) therapy system, a high intensity focused ultrasound (HIFU) system, and/or other treatment system and/or device that facilitates treatment. In one non-limiting instance, the therapy treatment system 114 automatically loads the received treatment plan into the system and/or automatically sets one or more treatment deliver parameters based thereon. In another instance, the therapy treatment system 114 loads the received treatment plan into the system and prompts the user for instructions, which may include accepting the plan or rejecting the plan. In another instance, the therapy treatment system 114 is manually configured by authorized personnel based on the treatment plan.
Other data that can additionally or alternatively be used by the treatment planning device 108 includes, but is not limited to, imaging data from an imaging modality(s) 116, non-imaging data from a repository(s) and/or system 118, a treatment simulation from a treatment simulator 120, existing treatment plans (for the patient and/or other patient(s)) and/or other data.
Suitable imaging modality(s) 116 may include, but is not limited to, computed tomography (CT), positron emission tomography (PET), single photon emission computed tomography (SPECT), magnetic resonance (MR), and/or other imaging data. Functional imaging data can be used to provide tracer uptake information, which may help locate, stage, monitor growth, and monitor response to treatment, and structural imaging data can be used to show morphological changes, such as changes in tissue size, and can be performed weeks after treatment, after the body has had time to respond to the dead cells, in order to determine whether treated tissue has shrunk or grown.
The data from the data repository(s) and/or system(s) 118 may include, but is not limited to, patient history (including medical and/or non-medical), laboratory results, medical and/or non-medical history of other patients, models, pathology, histology, pharmaceutical prescribed and taken by the patient, tumor grading, diagnoses, and/or other data that can be used to predict and/or monitor the dose to be imparted and/or imparted to a target and other regions of the subject by the therapy treatment device 108 and/or other system.
The treatment simulator 120 can be used to simulate the response and/or development of treated and/or untreated structures to be treated in the patient and predict how one or more of the different structures are likely to respond and/or develop with and/or without treatment. The simulator 120 generates an output signal indicative of the simulation, the simulation results, and/or the prediction.
It is to be appreciated that the bio-marker identifier 104 and/or the treatment planning device 108 include one or more processors that execute one or more computable executable instructions stored on computer readable medium such as physical memory to implement the functionality described herein and/or other functionality. Additionally or alternatively, the one or more computable executable instructions are carried in a signal or carrier wave.
The following provides several non-limiting examples of polypeptide radiotoxicity bio-markers that indicate higher or lower patient radiosensitivity. For these examples, blood serum samples of twenty-three (23) ectomized prostate cancer patients with high and low grade bowel and urinary toxicity (as determined via EPIC or otherwise) were collected before (0 Gy) during (20-26 Gy, 40-46 Gy and 60-66 Gy) and two months after RT. The serum samples were analyzed according to the examples below, and patterns in form of a set of polypeptide M/Z values were identified. Some patient samples were analyzed in four replicates in order to assess the reproducibility which was found to be high enough for reliable classification of the small training set.
It is known that spectra collected on different mass spectrometers differ slightly, e.g. due to imperfections in calibration. It is also known that the same mass spectral peak identified in different subjects may present itself at slightly different M/Z values. Such differences can be due to variation at various levels, including the genetic level and the post-translational modification level. Also, the mass spectrometer has limited mass resolution. As such, each peak or mass is defined as an interval. For estimating an acceptable mass range for a peak definition the M/Z interval is set to ±0.2% of the mean mass of the peak group.
With one example, 10 μL Serum from prostate cancer patients were prepared on CM10 arrays and analyzed according to the following:
With another example, 20 μL of these Serum samples were prepared and analyzed on IMAC30 arrays and analyzed according to the following:
The analyzed mass range includes the mass range of 2000-10000 Da according to p-Value, ROC-Limit, CV and Intensity difference (D). The identified clusters had either a p-Value≦0.06, a ROC-Limit≧0.8 or ≦0.2 or an D≧25 at one time point. Additionally the minimum cluster intensity was set to 1.
Although the above examples are discussed in connection with prostate cancer and bowel and urinary toxicity, it is to be understood that other bio-markers for other cancers (e.g., bladder, rectum, endometrial, cervix, etc.) and/or tissue of interest and/or toxicity of other organs are also contemplated herein.
It is to be appreciated that the ordering of the acts in the methods described herein is not limiting. As such, other orderings are contemplated herein. In addition, one or more acts may be omitted and/or one or more additional acts may be included.
At 1202, a bio-sample including polypeptides indicative of a radiotoxicity of a patient is processed and signal indicative thereof is generated. As described herein, the sample can be processed through mass spectrometry, immunoassay, and/or otherwise.
At 1204, a pre-determined set of polypeptide radiotoxicity bio-markers of interest are identified from the polypeptides.
At 1206, a radiotoxicity of the patient is identified based on the pre-determined set of polypeptide radiotoxicity bio-markers. This may include determining radiotoxicity based on intensity peaks before and/or during different time points of radiotherapy treatment for one or more combinations of polypeptides.
At 1208, a set of treatments for a treatment plan of a patient is identified based on the identified radiotoxicity of the patient. This may include determining an initial set of treatments and/or an adapted set of treatments after at least one radiotherapy treatment.
At 1210, the set of treatments is optimized based on the identified radiotoxicity of the patient.
At 1212, the optimized treatment plan is implemented.
At 1214, the treatment plan is adapted, as needed, during implementation based on the current radiotoxicity of the patient.
The above may be implemented via one or more processors executing one or more computer readable instructions encoded or embodied on computer readable storage medium such as physical memory which causes the one or more processors to carry out the various acts and/or other functions and/or acts. Additionally or alternatively, the one or more processors can execute instructions carried by transitory medium such as a signal or carrier wave.
The invention has been described with reference to the preferred embodiments. Modifications and alterations may occur to others upon reading and understanding the preceding detailed description. It is intended that the invention be constructed as including all such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/IB2012/053323 | 6/29/2012 | WO | 00 | 12/13/2013 |
| Number | Date | Country | |
|---|---|---|---|
| 61502960 | Jun 2011 | US |
