Gemcitabine-carboplatin (GCb) versus gemcitabine-oxaliplatin (GemOx) in cisplatin un-fit advanced urothelial carcinoma: Randomized phase II study (COACH Study).

Abstract

355 Background: More than half of patients (pts) with advanced urothelial cell carcinoma (UCC) are ineligible for cisplatin because of renal dysfunction or poor performance status. We investigated the activity and safety of first-line gemcitabine-oxaliplatin (GemOx) compared with gemcitabine-carboplatin (GCb) in cisplatin-ineligible pts with advanced UCC. Methods: Treatment naïve, cisplatin-ineligible pts with advanced UCC were randomly assigned to GemOx (gemcitabine 1000 mg/m2, oxliplatin 100 mg/m2 on D1 Q2W) or GCb (gemcitabine 1000 mg/m2 on D1 and 8, carboplatin AUC 4.5 on D1 Q3W) stratified by ECOG performance status (PS) and visceral metastases. The primary endpoint was response rate (RR), and secondary endpoints were progression-free survival (PFS) and overall survival (OS). Results: Between May 2013 and Mar 2017, 80 pts were enrolled and 79 pts received at least one dose of chemotherapy (39 pts in GCb; 40 pts in GemOx). Median age was 73 years (47-86) and ECOG PS was 2 in 42% of pts and 60% had visceral metastases. Median GFR was 45 ml/min (range 22-108) in GCb and 47 ml/min (range 15-73) in GemOx arm. With median follow-up duration of 37.8 months, all pts were off study treatments. RR were 48.7% and 55.0% in GCb and GemOx, respectively (p = 0.742). Median PFS and OS in GCb and GemOx arm were 5.5 months (95% CI, 4.8-6.2) vs. 4.4 months (95% CI, 2.7-6.1) [HR GemOx/GCb 0.92; p = 0.756] and 9.1 months (95% CI, 5.2-13.0) vs. 11.0 months (95% CI, 6.9-15.0) [HR 0.72; p = 0.194], respectively. The median cycle was 6 (1-10) in GCb and 7 (1-12) in GemOx. Grade 3 leukopenia, neutropenia and fatigue were more common in GCb arm (25.6% vs. 2.5%, p = 0.003; 33.3% vs. 10.0%, p = 0.014; 15.4% vs. 0%, p = 0.012). Dose delay and reduction in GCb and GemOx group were needed in 46.2%, 50.0% and 53.8%, 32.5%, respectively. Salvage chemotherapy after study treatment was offered in 54.3% and 55.9% of patients who experienced PD in GCb and GemOx arm. Conclusions: GemOx has showed comparable efficacy with GCb and favorable hematologic toxicity profile. GemOx may be used as a new option for patients who are not suitable for cisplatin-containing chemotherapy. Clinical trial information: NCT01487915.