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Tissue Sources for Accurate Measurement of Germline DNA Genotypes in Prostate Cancer Patients Treated With Radical Prostatectomy

2016; Wiley; Volume: 77; Issue: 4 Linguagem: Inglês

10.1002/pros.23283

1097-0045

Nima C. Emami, Lancelote Leong, Eunice Wan, Erin L. Van Blarigan, Matthew R. Cooperberg, Imelda Tenggara, Peter R. Carroll, June M. Chan, John S. Witte, Jeffry Simko,

Molecular Biology Techniques and Applications

BACKGROUND Benign tissue from a tumor-containing organ is commonly the only available source for obtaining a patient's unmutated genome for use in cancer research. While it is critical to identify histologically normal tissue that is independent of the tumor lineage, few additional considerations are applied to the choice of this material for such measurements. METHODS Normal formalin-fixed, paraffin-embedded seminal vesicle, and urethral tissues, in addition to whole blood, were collected from 31 prostate cancer patients having undergone radical prostatectomy. Genotype concordance was evaluated for DNA from each tissue source in relation to whole blood. RESULTS Overall, there was a greater genotype call rate for DNA derived from urethral tissue (97.0%) in comparison with patient-matched seminal vesicle tissues (95.9%, P = 0.0015). Furthermore, with reference to patient-matched whole blood, urethral samples exhibited higher genotype concordance (94.1%) than that of seminal vesicle samples (92.5%, P = 0.035). CONCLUSIONS These findings highlight the heterogeneity between diverse sources of DNA in genotype measurement and motivate the consideration of normal tissue biases in tumor-normal analyses. Prostate 77: 425–434, 2017. © 2016 Wiley Periodicals, Inc.