ObjectiveTo investigate the risk factors for early castration-resistant prostate cancer (CRPC) after androgen deprivation therapy (ADT) in patients primarily diagnosed with bone-metastatic prostate cancer (BMPC).

METHODSWe retrospectively analyzed the clinical data on 97 cases of primarily diagnosed BMPC treated in our hospital between January 2010 and May 2016. We included the patients without CRPC in group A and those with CRPC found within 12 months after ADT in group B. We obtained clinical data from the two groups of patients, including preoperative levels of hemoglobin, C-reactive protein and serum prostate-specific antigen (PSA), prostate volume, incidence rates of hypertension and diabetes mellitus, long-term use of aspirin or metformin, methods of biopsy and castration, Gleason scores, anti-androgen drugs, and radiotherapy with 89SrCl2, which were subjected to uni- or multivariate logistic regression analysis.

RESULTSCRPC developed in 48 (49.48%) of the 97 patients within 12 months after ADT. Univariate analysis showed the preoperative hemoglobin level, Gleason scores and biopsy by transurethral plasmakinetic resection of the prostate (TUPKRP) to be the risk factors for early CRPC, and multivariate logistic regression analysis identified two independent risk factors for it, which were the Gleason score (P = 0.010) and TUPKRP (P = 0.002).

CONCLUSIONSThe incidence rate of early CRPC is high in BMPC patients within 12 months after ADT, for which the independent risk factors include biopsy by TUPKRP and Gleason scores.