Validated prognostic significance of YB-1 genetic variation in metastatic prostate cancer.

Genetic polymorphism in YB-1 was previously shown to be associated with the prognosis of advanced prostate cancer patients treated with primary androgen-deprivation therapy. However, the significance of this polymorphism remains invalidated. In this study, we aimed to validate the prognostic significance of the YB-1 genetic polymorphism in metastatic prostate cancer. This study included 79 Japanese patients who were diagnosed as metastatic prostate cancer between 2000 and 2016. Genomic DNA was obtained from patient whole blood samples, and genotyping on YB-1 (rs12030724) was performed by PCR-based technique. The association of genotype in YB-1 with clinicopathological parameters and oncological outcome, including progression-free survival and overall survival, was examined. Homozygous wild-type (AA), heterozygous variant (AT), and homozygous variant (TT) were identified in 47 (59.5%), 26 (32.9%) and 6 patients (7.6%), respectively. Heterozygous/homozygous variant (AT/TT) in YB-1 was significantly associated with lower progression risk compared with homozygous wild-type (AA) (hazard ratio = 0.52; 95% confidence interval = 0.30-0.88, P = 0.015). Consistent with this finding, heterozygous/homozygous variant (AT/TT) in YB-1 was significantly associated with lower risk of any-cause mortality compared with homozygous wild-type (AA) (hazard ratio = 0.46; 95% confidence interval = 0.21-0.93, P = 0.031). Gene polymorphism in YB-1 rs12030724 was validated to be a promising predictive biomarker of androgen-deprivation therapy in metastatic prostate cancer to identify patients requiring more intensive therapeutics.