[IMPACT OF ADJUVANT CHEMOTHERAPY AFTER RADICAL CYSTECTOMY FOR PATIENTS WITH LOCALLY ADVANCED BLADDER CANCER].

Abstract

(Objective) The study aimed to retrospectively evaluate the therapeutic effects of adjuvant chemotherapy (AC) in patients following radical cystectomy (RC) in locally advanced bladder cancer. (Methods) A single-center-derived database registered 227 patients diagnosed with muscle-invasive bladder cancer and treated with RC and pelvic lymphadenectomy between March 2003 and December 2021. Of these, patients diagnosed with non-organ-confined diseases were classified as either pT3-T4 or pN-positive without distant metastasis. Platinum-based AC was administered for the following categories: two courses for patients with pT3-T4 and pN-negative and three courses for those with pTany and pN-positive. The primary endpoint was the disease-free survival (DFS) and overall survival (OS) between the patients receiving and not receiving AC. (Results) Among all patients, 90 were diagnosed with non-organ-confined disease: 43 (47.8%) were treated with AC and the remaining 47 (52.2%) were left untreated. The methotrexate, vinblastine, doxorubicin, and cisplatin regimen; the gemcitabine and cisplatin regimen; and the gemcitabine and carboplatin regimen were administered to 14 (32.6%), 25 (58.1%), and 4 (9.3%) patients, respectively. With a median follow-up period of 26 months, the groups that received and did not receive AC had 2-year DFS rates of 36.3% and 25.9% (median DFS time: 15 vs. 8 months, p=0.026) and 2-year OS rates of 64.3% and 41.4% (median OS time: 38 vs. 18 months, p=0.064), respectively. In patients with pT3-T4 and pN-negative, no significant difference in the median DFS and OS between the AC and non-AC groups was observed. However, in patients with pTany and pN-positive, the DFS (median: 14 vs. 4.5 months, p=0.002) and OS (38 vs. 11.5 months, p=0.009) were longer in the AC than those in the non-AC group, respectively. The multivariate Cox regression analysis revealed that AC administration was an independent predictor for DFS (hazard ratio: 0.44, 95% confidence interval: 0.24-0.79, p=0.006). (Conclusion) Platinum-based AC following RC significantly improved DFS in pN-positive patients with locally advanced bladder cancer.