Abstract
Purpose: Bevacizumab is a standard first-line (L1) treatment for metastatic colorectal cancer (mCRC) patients regardless of RAS status. This retrospective study examined treatment patterns and outcomes in a community oncology sample of KRAS mutant mCRC patients treated with chemotherapy (C) or C plus bevacizumab (CB) in L1. Methods: This study used medical records from the Vector Oncology Data Warehouse. Eligible patients were confirmed KRAS mutant mCRC and received L1 C or CB. Kaplan-Meier analysis assessed L1 progression-free survival (PFS) and overall survival (OS). Cox regression models examined the interaction of tumor location (R/L) with treatment. Results: CB (n = 264) compared to C (n = 109) patients were younger, less likely performance status (PS) impaired, and more likely with liver metastases. Median unadjusted PFS was 10.41 months (95% CI 9.0–11.3) in CB and 7.66 months (95% CI 6.5–9.1) in C patients (p = 0.174). Median unadjusted OS was 26.91 months (95% CI 24.3–29.3) in CB and 23.33 months (95% CI 19.7–29.2) in C patients (p = 0.571). For patients with right- vs. left-sided tumors, C (but not CB)-treated patients had higher adjusted risk for progression (HR = 1.715, 95% CI 1.108, 2.653; p = 0.015). Conclusions: CB- vs. C-treated KRAS mutant mCRC patients may have a meaningful PFS benefit. Patients with right-sided tumors treated with C were at higher risk for disease progression than patients with left-sided tumors. Tumor location had no significant effect on outcomes in the CB cohort.
Original language | English (US) |
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Pages (from-to) | 16-22 |
Number of pages | 7 |
Journal | Journal of gastrointestinal cancer |
Volume | 50 |
Issue number | 1 |
DOIs | |
State | Published - Mar 15 2019 |
Keywords
- Overall survival
- Real world outcomes
- Standard chemotherapy backbones
- Tumor location
- VEGF inhibitors
ASJC Scopus subject areas
- Oncology
- Gastroenterology