Abstract:
BACKGROUND:Combination platinum chemotherapy is standard first-line therapy for metastatic urothelial carcinoma (mUC). Defining the platinum response biomarkers for patients with mUC could establish personalize medicine and provide insights into mUC biology. Although DNA repair mechanisms have been hypothesized to mediate the platinum response, we sought to analyze whether increased expression of DNA damage genes would correlate with worse overall survival (OS) in patients with mUC. PATIENTS AND METHODS:We retrospectively identified a clinically annotated cohort of patients with mUC, who had been treated with first-line platinum combination chemotherapy. A tissue microarray was constructed from formalin-fixed paraffin-embedded tissue from the primary tumor before treatment. Immunohistochemical analysis of the following DNA repair proteins was performed: ERCC1, RAD51, BRCA1/2, PAR, and PARP-1. Nuclear and cytoplasmic expression was analyzed using multispectral imaging. Nuclear staining was used for the survival analysis. Cox regression analysis was used to evaluate the associations between the percentage of positive nuclear staining and OS in multivariable analysis, controlling for known prognostic variables. RESULTS:In a cohort of 104 patients with mUC, a greater percentage of nuclear staining of ERCC1 (hazard ratio [HR], 2.7; 95% confidence interval [CI], 1.5-4.9; P = .0007), RAD51 (HR, 5.6; 95% CI, 1.7-18.3; P = .005), and PAR (HR, 2.2; 95% CI, 1.1-4.4; P = .026) was associated with worse OS. BRCA1, BRCA2, and PARP-1 expression was not associated with OS (P = .76, P = .38, and P = .09, respectively). A greater percentage of combined ERCC1 and RAD51 nuclear staining was strongly associated with worse OS (P = .005). CONCLUSION:A high percentage of nuclear staining of ERCC1, RAD51, and PAR, assessed by immunohistochemistry, correlated with worse OS for patients with mUC treated with first-line platinum combination chemotherapy, supporting the evidence of the DNA repair pathways' role in the prognosis of mUC. We also report new evidence that RAD51 and PAR might play a role in the platinum response. Additional prospective studies are required to determine the prognostic or predictive nature of these biomarkers in mUC.
journal_name
Clin Genitourin Cancerjournal_title
Clinical genitourinary cancerauthors
Mullane SA,Werner L,Guancial EA,Lis RT,Stack EC,Loda M,Kantoff PW,Choueiri TK,Rosenberg J,Bellmunt Jdoi
10.1016/j.clgc.2015.12.029subject
Has Abstractpub_date
2016-08-01 00:00:00pages
352-9issue
4eissn
1558-7673issn
1938-0682pii
S1558-7673(15)00359-6journal_volume
14pub_type
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