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Methods and compositions of molecular profiling for disease diagnostics

a technology of molecular profiling and disease, applied in the field of methods and compositions of molecular profiling for disease diagnostics, can solve the problems of no definitive diagnosis, sharp increase in the number of cancers, and no definitive diagnosis

Inactive Publication Date: 2013-08-29
VERACYTE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0032]FIG. 22 depicts a titration curve of error rate vs. number of genes using an SVM-based classification algorithm. The titration curve plateaus when the classification algorithm examines 200-250 genes. These data indicate that the overall error rate of the current algorithm was 4% (5 / 138).

Problems solved by technology

Furthermore, as the general population continues to age, cancer will become a bigger and bigger problem.
While these techniques have proven to be both useful and inexpensive, they suffer from a number of drawbacks.
First, cytological analysis and imaging techniques for cancer diagnosis often require a subjective assessment to determine the likelihood of malignancy.
Second, the increased use of these techniques has lead to a sharp increase in the number of indeterminate results in which no definitive diagnosis can be made.
Third, these routine diagnostic methods lack a rigorous method for determining the probability of an accurate diagnosis.
Fourth, these techniques may be incapable of detecting a malignant growth at very early stages.
Fifth, these techniques do not provide information regarding the basis of the aberrant cellular proliferation.
Further, the cost of any treatments can be prohibitive for an individual, insurance provider, or government entity.
In addition, there are continued treatment costs and complications due to the need for lifelong drug therapy to replace the lost thyroid function.

Method used

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  • Methods and compositions of molecular profiling for disease diagnostics
  • Methods and compositions of molecular profiling for disease diagnostics
  • Methods and compositions of molecular profiling for disease diagnostics

Examples

Experimental program
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Effect test

example 1

Gene Expression Product Analysis of Thyroid Samples

[0312]75 thyroid samples were examined for gene expression analysis using the Affymetrix Human Exon 10ST array according to manufacturer's instructions to identify genes that showed significantly differential expression and / or alternative splicing between malignant, benign, and normal samples. Three groups were compared and classified according to pathological surgical diagnosis of the tissue: benign (n=29), malignant (n=37), and normal (n=9). The samples were prepared from surgical thyroid tissue, snap frozen and then the RNA was prepared by standard methods. The names and pathological classification of the 75 samples are depicted in FIG. 1.

[0313]Microarray analysis was run with XRAY version 2.69 (Biotique Systems Inc.). Input files were normalized with full quantile normalization (Irizarry et al. Biostatistics 2003 Apr. 4 (2): 249-64). For each input array and each probe expression value, the array-ith percentile probe value was r...

example 2

Gene Expression Product Analysis of Thyroid Tissue Samples

[0319]A total of 205 thyroid tissue samples (FIG. 7) are examined with an Affymetrix HumanExon10ST array chip to identify genes that differ significantly in RNA expression levels between benign and malignant samples. Samples are classified according to post-surgical thyroid pathology: samples exhibiting follicular adenoma (FA), lymphocytic thyroiditis (LCT), or nodular hyperplasia (NHP) are classified as benign; samples exhibiting Hurthle cell carcinoma (HC), follicular carcinoma (FC), follicular variant of papillary thyroid carcinoma (FVPTC), papillary thyroid carcinoma (PTC), medullary thyroid carcinoma (MTC), or anaplastic carcinoma (ATC) are classified as malignant.

[0320]Affymetrix software is used to extract, normalize, and summarize intensity data from roughly 6.5 million probes. Approximately 280,000 core probe sets are subsequently used in feature selection and classification. The models used are LIMMA for feature sel...

example 3

Meta-analysis of Gene Expression Product Data from Thyroid Samples

[0324]Surgical thyroid tissue samples (FIG. 7) and thyroid samples obtained via fine needle aspiration (FIG. 8) are identified as benign or malignant by pathological examination and then examined by hybridization to an Affymetrix HumanExonl OST array. A meta-analysis approach is utilized which allows the identification of genes with repeatable features in each classification. Affymetrix software is used to extract, normalize, and summarize intensity data from approximately 6.5 million probes. Roughly 280,000 probe sets are used for feature selection and classification. LIMMA is used for feature selection. Classification is performed with random forest and SVM methods. Markers that repeatedly appear in multiple iterative rounds of training, classification, and cross validation of the surgical and fine needle aspirate samples are identified and ranked. A joint set of core features are created using the top ranked featur...

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Abstract

The present invention relates to compositions, kits, and methods for molecular profiling and cancer diagnostics, including but not limited to gene expression product markers, alternative exon usage markers, and DNA polymorphisms associated with cancer. In particular, the present invention provides molecular profiles associated with thyroid cancer, methods of determining molecular profiles, and methods of analyzing results to provide a diagnosis.

Description

CROSS REFERENCE[0001]This application claims the benefit of U.S. Provisional Application No. 61 / 199,585, entitled “Methods and Compositions of Molecular Profiling for Diagnosis of Cancer” filed Nov. 17, 2008, and U.S. Provisional Application No. 61 / 270,812, entitled “Methods and Compositions of Molecular Profiling for Diagnosis of Cancer” filed Jul. 13, 2009, both of which are incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]Cancer is the second leading cause of death in the United States and one of the leading causes of mortality worldwide. Nearly 25 million people are currently living with cancer, with 11 million new cases diagnosed each year. Furthermore, as the general population continues to age, cancer will become a bigger and bigger problem. The World Health Organization projects that by the year 2020, global cancer rates will increase by 50%.[0003]Successful treatment of cancer starts with early and accurate diagnosis. Current methods of diag...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C12Q1/68G16B25/10
CPCC12Q1/6886C12Q2600/112C12Q2600/158G06Q99/00G01N33/574G01N33/57407C12Q2600/178G16B25/10G16B25/00A61B10/0096A61B10/0283A61B50/30
Inventor KENNEDY, GIULIA C.ANDERSON, BONNIE H.CHUDOVA, DARYA I.WANG, ERIC T.WANG, HUIPAGAN, MORAIMARABBEE, NUSRATWILDE, JONATHAN I.
Owner VERACYTE INC
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