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5546 Background: The EWOC-1 trial compared Carboplatin monotherapy (C mono) to two different Carboplatin + Paclitaxel (CP) regimens (weekly or 3-weekly) in vulnerable elderly patients treated for advanced ovarian cancers (OC). This study was closed prematurely because of a worse outcome in the C mono group. Both CP regimens were equivalent in terms of feasibility and efficacy with different toxicity profiles. Optimal CP regimen in elderly patient is still unknown. Here we propose a study of another adapted regimen of CP (aCP) performed in elderly patients in our institution. Methods: We retrospectively analyzed OC patients ≥ 70 years who received a Carboplatin AUC 4-5 d1q3week + Paclitaxel 80 mg/m² d1-d8 q3week regimen between 2015 and 2019. Primary endpoint was treatment feasibility according to the EWOC-1 standard: completion of 6 courses of chemotherapy without early stopping for disease progression, death or unacceptable toxicity (adverse event (AE) related to chemotherapy or treatment procedure leading either to early treatment stopping, to an unplanned hospital admission or to death or to a dose delay lasting more than 14 days or more than 2 dose reductions). Results: We identified 36 pts with a median age of 79 years (table). All patient but one had an ONCODAGE-G8 score ≤ 14, 30.6% of patients had a comorbidity Charlson’s index > 4 and 52.5% had an albumin rate < 35 g/L. The feasibility endpoint was met in 58.3% of patients (IC95% = [25.6; 57.8]). Main causes of treatment failure (TF) were early discontinuation because of toxicity in 6 patients (16.7%) and progressive disease in 3 patients (8.33%). Median PFS was 35.3 months (IC95% = [22.7; NR]) and median OS was 62.1 months (IC95% = [31.4.0; NR]). The most frequent AE were asthenia (all grades = 94.4%, grade 3-4 = 13.9%), anemia (all grades = 94.4%, grade 3-4 = 27.8%), neutropenia (all grades = 66.7%, grade 3-4 = 38.9%) and neuropathy sensory (all grades = 61.1%, no grade 3-4). Non high-grade-serous histological type and a poor Charlson’s score were associated with a higher rate of TF (100% and 63.6%, respectively). Conclusions: These results are consistent with the findings of the EWOC-1 trial in both CP regimens and suggest that aCP could be non-inferior with an acceptable toxicity profile. Further prospective and comparative studies are mandatory to confirm this trend and to better identify predictive factors of TF in OC elderly patients.[Table: see text]