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Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: OBJECTIVE, METHODS, RESULTS. Meshes: Adenocarcinoma, Antibodies, Monoclonal, Humanized, Antineoplastic Agents, Antineoplastic Combined Chemotherapy Protocols, Bevacizumab, Camptothecin, Cetuximab, Colorectal Neoplasms, Disease-Free Survival, Female, Humans, Irinotecan, Kaplan-Meier Estimate, Male, Middle Aged, Organoplatinum Compounds, Oxaliplatin, Prognosis, Retrospective Studies, Treatment Outcome.
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Is comparison of cetuximab to bevacizumab as the first-line bio-chemotherapy for patients with metastatic colorectal cancer : superior progression-free survival restricted to patients with measurable tumors and objective tumor response -- a retrospective study? Context: We aimed to compare the treatment efficacy of cetuximab versus bevacizumab in combination with either irinotecan-based or oxaliplatin-based regimens (targeted triplet) as the first-line treatment for patients with metastatic colorectal cancer. Between April 2005 and March 2012, patients (n = 158) diagnosed with metastatic colorectal cancer after at least four courses of first-line bevacizumab-based (n = 95) or cetuximab-based triplet (n = 63) were retrospectively analyzed. The KRAS genotypes were sequenced for all patients. The Kaplan-Meier method was used for survival analysis, and Cox proportional hazards models were used for univariate and multivariate analyses. Cetuximab-based triplet was associated with a higher objective response rate (66.0 vs. 47.2 %, p = 0.037) and a higher conversion rate to resectability (39.7 vs. 20.0 %, p = 0.007) compared to bevacizumab-based triplet. Compared with bevacizumab-based triplet, cetuximab-based triplet significantly increased progression-free survival in patients with measurable metastatic colorectal cancer who achieved objective tumor response (responders) (median 13.1 vs. 10.5 months, p = 0.023), but no significant increase was observed for overall survival. After adjustment for group differences in baseline characteristics and combined chemotherapy agents, cetuximab-based triplet remained an independent determinant of progression-free survival in responders as compared with bevacizumab-based triplet. KRAS mutation was not a prognostic factor in patients with metastatic colorectal cancer.
assistant
As compared with bevacizumab-based triplet, cetuximab-based triplet as the first-line treatment of metastatic colorectal cancer was associated with better progression-free survival in patients with measurable tumors who achieved objective tumor response to bio-chemotherapy. Final Decision: yes