Neoadjuvant chemohormonal therapy combined with radical prostatectomy and extended PLND for very high risk locally advanced prostate cancer: A retrospective comparative study

Abstract

ObjectiveDocetaxel has been shown to be an effective chemotherapy agent when combined with androgen deprivation therapy for hormone sensitive metastatic prostate cancer (CaP). Since very high risk CaP has a high rate of occult metastatic disease and early recurrence, we hypothesize that patients with very high risk locally advanced CaP may benefit from docetaxel-based neoadjuvant chemohormonal therapy (NCHT). Thus, we conducted a retrospective study to identify the outcome of these patients treated with NCHT followed by radical prostatectomy (RP). Patients and MethodsWe retrospectively analyzed data from 177 consecutive patients who had very high risk locally advanced CaP between March 2014 and July 2017. Patients received 3 different therapies: (i) 60 men in NCHT group, (ii) 73 men in neoadjuvant hormonal therapy (NHT) group, and (iii) 44 men received immediate RP without neoadjuvant therapy (No-NT group). Surgical outcomes were analyzed and survival differences were compared by the Kaplan-Meier method. ResultsThe NCHT group had statistically significant higher preoperative Prostate-Specific Antigen (PSA) (P < 0.002), higher Gleason score (P < 0.002), and more advanced clinical stage (P < 0.001) than other groups. After RP, 81% (42/52) of patients in NCHT group, 73% (51/70) of patients in NHT group, and 48% (21/44) of patients in No-NT group achieved an undetectable PSA (P < 0.001). A total of 14% (6/42) patients achieving a postoperative undetectable PSA experienced biochemical recurrence in the NCHT group, with median biochemical progression-free survival (bPFS) time of 19 months; 47% (24/51) experienced biochemical recurrence in the NHT group, with median bPFS time of 13 months; 81% (17/21) experienced biochemical recurrence in the No-NT group, with median bPFS time of 9 months (P < 0.001). The median follow-up time of 3 groups was 12.5 months in the NCHT group, 18.3 months in the NHT group, and 22.8 months in the No-NT group (P = 0.01). ConclusionDespite having poorer prognostic factors, the NCHT group had better bPFS time after surgery compared to NHT and No-NT groups. Randomized controlled investigations are needed to validate these results and further follow-up is required for survival endpoints.