Abstract 105P
Background
Both regimens of TAS-102 (trifluridine/tipiracil) with and without bevacizumab are considered standard options for salvage treatment in patients with refractory metastatic colorectal cancer.
Methods
This analysis included patients with metastatic colorectal cancer who received either TAS-102 plus bevacizumab or TAS-102 alone between July 2022 and November 2023 at Samsung Medical Center. We evaluated the objective response rate (ORR), progression-free survival (PFS), overall survival (OS), and safety profile of both regimens.
Results
Of 139 patients, 83 (59.7%) received TAS-102 with bevacizumab, and 56 (40.3%) received TAS-102 alone. The median number of previous lines of therapy was four (range: 2.45–6.55). More than half the subjects (56.8%) had RAS mutations and 92.9% had received previous anti-VEGF therapy. The number of patients with prior regorafenib treatment was 14 in the TAS-102 with bevacizumab group and five in the TAS-102 alone group. The disease control rate was 51.8% in the combination group and 32.1% in the TAS-102 alone group. The median PFS was 3.3 months (95% CI, 2.7–6.6) in the combination group and 2.5 months (95% CI, 2.0–3.8) in the TAS-102 alone group (HR, 0.56; 95% CI, 0.38–0.82; p=0.003). The median OS in these two groups was 10.8 months (95% CI, 8.4–NA) and 6.0 months (95% CI, 4.8–9.8), respectively (HR, 0.62; 95% CI, 0.40–0.97, p=0.033). In the groups, commonly observed adverse events were hematologic-related, including neutropenia, anemia, and thrombocytopenia, as well as nausea. While any grade neutropenia was observed at similar frequencies in the two groups (57.8% and 57.1%), grade 3 or higher neutropenia was more frequent in the combination group than the TAS-102 alone group (31.3% vs. 17.9%). Among patients who received subsequent anticancer therapy after treatment failure, 74.1% received regorafenib.
Conclusions
The combination of TAS-102 and bevacizumab resulted in a better survival outcome than TAS-102 monotherapy, consistent with previous studies. This analysis supports the use of the combination of TAS-102 and bevacizumab as the best therapeutic option for patients with refractory metastatic colorectal cancer in clinical practice.
Clinical trial identification
Editorial acknowledgement
Legal entity responsible for the study
The authors.
Funding
Has not received any funding.
Disclosure
All authors have declared no conflicts of interest.