Disease characteristics and clinical practice of BRAF V600E-mutant metastatic colorectal cancer treatment: Baseline analysis of patients enrolled in the BERING CRC study.

34 Background: BRAF V600E-mutant metastatic colorectal cancer (mCRC) is associated with a poor prognosis and limited clinical data. Based on results from the BEACON CRC trial, targeted treatment with encorafenib plus cetuximab (E+C) is available as a standard of care for these patients (pts) after prior systemic therapy. Since data from controlled clinical trials are based on a selected patient population, the non-interventional study (NIS) BERING CRC observes a broader patient population in clinical practice. Methods: BERING CRC is the first NIS investigating the use of E+C in clinical practice of BRAF V600E-mutant mCRC treatment after prior systemic therapy in Germany, Austria, and Switzerland. For the present analysis, disease characteristics and treatment data of the initial 81 pts were documented in 44 sites across Germany and Austria between 09/2020 and 04/2022. BERING-CRC is ongoing and aims to enroll up to 300 pts from 126 German, Austrian, and Swiss sites. The study observes pts treated according to the approved respective Summary of Product Characteristics (SmPC). The primary endpoint is the 1-year overall survival rate. Secondary endpoints include efficacy, QoL, and tolerability of E+C. Results: 81 pts were included in this baseline analysis. Median age was 67 years (range 34-88) and 48% were female. 48 pts (59%) were documented with right-sided tumors and for 62% stage IV disease was noted at initial diagnosis. In the metastatic setting, main sites of metastasis were liver, peritoneum, and lung (52%, 32%, and 22% of pts, respectively), with 16% of pts having ≥ 3 sites documented. For 30% of pts, an ECOG performance status (PS) of 0 was documented at baseline assessment (57% ECOG PS 1 or 2). Adjuvant treatment was reported for 22 pts while relapse ≤ 6 months was documented for 10 of them. Consistent with BEACON CRC, adjuvant systemic therapy with relapse within ≤6 months was counted as metastatic 1st line treatment. 91% of pts with adjuvant treatment received chemotherapy alone in this setting. 4 pts (5%) were documented with E+C treatment directly following adjuvant therapy and 55% of all pts with documented first-line treatment (69 pts) received chemotherapy alone (CT), for 35% chemotherapy was combined with targeted therapy (CT+TT), 3% received immunotherapy, and 1% received TT alone. In second-line, 71% of pts with documented treatment received E+C (7% CT, 16% CT+TT). An initial bi-weekly cetuximab dosing was reported for 10% of pts treated with E+C. Conclusions: While the high number of pts with right-sided tumors was in line with previous findings on BRAF V600E-mutant mCRC pts, synchronous metastasis was reported considerably more often in this real-world cohort. As complementation to previous controlled clinical trial data, pts enrolled in BERING-CRC were notably older and presented with higher ECOG PS compared to the pivotal study. Clinical trial information: NCT04673955 .