Ewoc-1: A Randomized Trial To Evaluate The Feasibility Of Three Different First-Line Chemotherapy Regimens For Vulnerable Elderly Women With Ovarian Cancer (Oc): A Gcig-Engot-Gineco Study.

5508 Background: The Geriatric Vulnerability Score (GVS) combining albumin, lymphocyte count, ADL, IADL and HADS scores has been reported (Falandry C Ann Oncol 2013) to identify vulnerable elderly OC patients (pts) as those with a GVS≥3. For such pts, Carboplatin (Cb) monotherapy or weekly Cb plus paclitaxel (Pa) are often proposed as an alternative to Cb-Pa given every 3 weeks. Methods: Pts ≥70 yrs with first line FIGO stage III/IV epithelial OC were screened for GVS. Those with GVS≥3 were randomized to receive either arm A: Cb AUC5-6 + Pa 175mg/m², d1q3week or arm B: Cb AUC5-6 d1q3week or arm C:weekly Cb AUC2 + Pa 60mg/m² d1-d8-d15 q4week. Primary endpoint is treatment feasibility defined as the ability to complete 6 chemotherapy courses without disease progression, early treatment stopping due to unacceptable toxicity or death. Inclusion of 240 pts was planned. Results: Among 444 screened pts, 120 were randomized from 12/2013 to 04/2017 (armA = B = C = 40). Pts characteristics were well balanced between arms A-B-C respectively: median age (79-82-80 yrs), FIGO stage IV (32-37-27%), primary surgery (65-72-70%), absence of macroscopic residuals (CC-0) (7-5-7%), ECOG≥2 (50-50-47%). Feasibility per protocol for arms A-B-C is 65%, 47% and 60% (p = 0.15). Main reasons for treatment arrest are treatment toxicity (A:20%; B:15%; C:22.5%; p = 0.771) and disease progression (A:7.5%; B:30%; C:2%; p = 0.004). Median PFS for arm A-B-C are 12.5 mos (95%CI 10.3-15.3), 4.8 (3.8-15.3) and 8.3 (6.6-15.3), respectively (p < 0.001) and median OS for arm A-B-C is not reached (NR) (21, NR), 7.4 (5.3-NR) and 17.3 (10.8-NR), respectively (p = 0.001). At the pre-planned intermediate analysis, the IDMC recommended to prematurely close the study as survival in armB was found significantly worse and the number of potential pts required to find a significant difference between both Cb-Pa regimens (arms A&C) was out of reach. Conclusions: Compared to 3-weekly and weekly Cb-Pa regimens, Cb single agent was reported to be less active with significant worse survival outcome in vulnerable elderly pts. In this population Cb-Pa combination remains a standard. Clinical trial information: NCT02001272.