Genomic investigation of etiologic heterogeneity: Methodologic challenges Journal Article

Authors: Begg, C. B.; Seshan, V. E.; Zabor, E. C.; Furberg, H.; Arora, A.; Shen, R.; Maranchie, J. K.; Nielsen, M. E.; Rathmell, W. K.; Signoretti, S.; Tamboli, P.; Karam, J. A.; Choueiri, T. K.; Hakimi, A. A.; Hsieh, J. J.
Article Title: Genomic investigation of etiologic heterogeneity: Methodologic challenges
Abstract: Background: The etiologic heterogeneity of cancer has traditionally been investigated by comparing risk factor frequencies within candidate sub-types, defined for example by histology or by distinct tumor markers of interest. Increasingly tumors are being profiled for molecular features much more extensively. This greatly expands the opportunities for defining distinct sub-types. In this article we describe an exploratory analysis of the etiologic heterogeneity of clear cell kidney cancer. Data are available on the primary known risk factors for kidney cancer, while the tumors are characterized on a genome-wide basis using expression, methylation, copy number and mutational profiles. Methods: We use a novel clustering strategy to identify sub-types. This is accomplished independently for the expression, methylation and copy number profiles. The goals are to identify tumor sub-types that are etiologically distinct, to identify the risk factors that define specific sub-types, and to endeavor to characterize the key genes that appear to represent the principal features of the distinct sub-types. Results: The analysis reveals strong evidence that gender represents an important factor that distinguishes disease sub-types. The sub-types defined using expression data and methylation data demonstrate considerable congruence and are also clearly correlated with mutations in important cancer genes. These sub-types are also strongly correlated with survival. The complexity of the data presents many analytical challenges including, prominently, the risk of false discovery. Conclusions: Genomic profiling of tumors offers the opportunity to identify etiologically distinct sub-types, paving the way for a more refined understanding of cancer etiology. © 2014 Begg et al.; licensee BioMed Central.
Keywords: kidney cancer; etiologic heterogeneity; tumor sub-types
Journal Title: BMC Medical Research Methodology
Volume: 14
Issue: 1
ISSN: 1471-2288
Publisher: Biomed Central Ltd  
Date Published: 2014-12-22
Start Page: 138
Language: English
DOI: 10.1186/1471-2288-14-138
PROVIDER: scopus
PMCID: PMC4292824
PUBMED: 25532962
Notes: Export Date: 2 April 2015 -- Source: Scopus
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MSK Authors
  1. Venkatraman Ennapadam Seshan
    288 Seshan
  2. Colin B Begg
    239 Begg
  3. Ronglai Shen
    129 Shen
  4. Emily Craig Zabor
    131 Zabor
  5. James J Hsieh
    114 Hsieh
  6. Arshi Arora
    21 Arora
  7. Abraham Ari Hakimi
    134 Hakimi