Efficacy and safety of trifluridine/tipiracil and bevacizumab (FTD/TPI+BEV) in patients with metastatic colorectal cancer (mCRC) in real-world practice.

204 Background: In Sunlight trial, the combination of FTD/TPI + BEV showed a significant improvement in Overall Survival (OS) and Progression-Free Survival (PFS), along with better Objective Response Rate (ORR) and Disease Control Rate (DCR), compared to FTD/TPI alone, in patients with mCRC progressing after two chemotherapy regimens. The BeTAS trial aimed to evaluate the effectiveness and safety of the FTD/TPI + BEV combination in real-world practice. Methods: This was a retrospective, observational, multicenter study of mCRC patients treated with FTD/TPI+BEV in routine clinical practice across 11 Spanish university hospitals. It included patients with mCRC who were refractory or intolerant to standard therapies. Results: A total of 208 patients treated with FTD/TPI+BEV between July 2019 and December 2023 were included. The median age was 69 years (range 33 to 88 years), with 59.8% being male. 15.3% had an ECOG performance status of 2, 55.9% had RAS mutations, 30.3% had three or more metastatic sites, and 81.2% had liver metastases. Additionally, 19.8% had a time from diagnosis of first metastasis of less than 18 months, and 55.3% were categorized in Tabernero's Unfavorable Prognostic Subgroup. Most patients (81.3%) received FTD/TPI+BEV as third-line therapy, with 90.5% having previously received anti-VEGF therapy. The median number of treatment cycles was 4 (range 1 to 31 cycles). The ORR was 4.6%, and the DCR was 50%. The median PFS was 4.9 months (95% CI, 4.0-5.7 months), and the median OS was 11.1 months (95% CI, 9.5-12.8 months). The most common grade 3-4 toxicities included neutropenia (41.8%), asthenia (7.2%), and hepatic toxicity (5.5%). No treatment-related deaths were reported. Conclusions: Our series confirms the efficacy and safety of FTD/TPI + BEV in routine clinical practice, even in a population with poor prognosis and an extensive history of previous treatments.