Background: MRCC is a devastating disease with poor long-term outcomes. The addition of bevacizumab (BEV) to chemotherapy (CT) significantly improved overall survival (OS) in MRCC patients (pts). Aim: to characterize clinico-pathologic features associated with CR and its impact on outcome of MRCC pts. Methods: Single-institution prospective series of MRCC pts who were treated with 1 st line CT between 2005 and 2018. CR was defined by Response Evaluation Criteria in Solid Tumors (RECIST v1). Prognostic and predictive value of "Moore criteria" was evaluated.Results: 98 pts (61% squamous; 29% adenocarcinoma; 8% others) with median age of 49 years (28-77) were investigated. 57 pts (58%) had prior CT-radiation; 73 pts (75%) had recurrent/persistent disease (39 pts > 12 months (m) disease free interval) and 23 pts (24%) were stage IVb at diagnosis (47% visceral involvement). Moore risk distribution: 9 high, 53 medium, 9 low risk. 70 pts (72%) platinum-based-CT (PCT) (46% Cisplatin; 26% Carboplatin); 24 pts (25%) received CT þ BEV. After a median followup of 21.2 m, overall response rate (RR) was 59%, median PFS was 7 m (CI95% 6-9) and median OS 14 m (CI95% 11-24). Moore criteria correlated with prognosis (highrisk pts had significantly worse OS, HR ¼ 25, p < 0.001). Higher RR was observed among low and intermediate risk pts (77% and 54%) as compared to high (11%, p < 0.001). CRs occurred in 21/94 (22%) evaluable pts (BEV group 5/23; non-BEV 16/ 71, p ¼ 1). Factors associated with CR in univariate analysis: no visceral involvement (OR ¼ 1.54, p < 0.01), no prior CT (OR ¼ 1.85, p ¼ 0.04) and Moore criteria low/intermediate (vs. high, OR ¼ 2.36, p ¼ <0.01). Median time to CR and median duration of CR were 4.6 m (4.1 -5.3) and 7.4 m (3.6-NR), respectively. CR significantly impacted on PFS (14.6 m vs 6.5 m non-CR, p < 0.001) and OS (NR vs 11 m non-CR, p < 0.001). Nine pts discontinued treatment due to toxicity (1 pt had vesico-vaginal fistula related to BEV). Conclusions: CR is a meaningful surrogate marker for improved PFS and OS in MRCC pts treated with 1 st line CT. In our series, visceral involvement, prior CT and Moore criteria were identified as predictive markers for CR. Legal entity responsible for the study: A. Oaknin.
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