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Effect of BRAF V600E mutation on tumor response of anti-EGFR monoclonal antibodies for first-line metastatic colorectal cancer treatment: a meta-analysis of randomized studies

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Abstract

Anti-EGFR monoclonal antibodies (anti-EGFR MoAbs) in metastatic colorectal cancer (mCRC) treatment are still not effective in all patients. This study aimed to evaluate the relationship between BRAF V600E mutation and the tumor response of anti-EGFR MoAbs for first-line treatment in mCRC patients. We searched the MEDLINE and EMBASE databases, using the key words that included colorectal cancer, cetuximab, panitumumab, and BRAF mutation and retrieved 445 articles. Among them four were included in the systematic review. Relative risks (RRs) with 95 % confidence intervals (CI) for response rate were calculated. BRAF mutation carriers had worse ORR than non-carriers in mCRC patients with KRAS wild-type in first-line treatment whether adding anti-EGFR MoAb to chemotherapy or not (RR = 0.43, [95 % CI 0.16–0.75]; RR = 0.38, [95 % CI 0.20–0.73]). But in the unselected patients whose KRAS mutation were unknown, BRAF mutation carriers had similar ORR whether adding cetuximab to chemotherapy or not (RR = 0.45, [95 % CI 0.18–1.09]; RR = 0.57, [95 % CI 0.15–2.23]). In BRAF mutation carriers adding anti-EGFR MoAb to chemotherapy was similar to chemotherapy alone whether in patients with wild-type KRAS or unselected patients (RR = 1.61, [95 % CI 0.57–4.47]; RR = 0.71, [95 % CI 0.18–2.77]). But in the BRAF mutation non-carriers, adding anti-EGFR MoAb produced a clear benefit in response rate than chemotherapy alone and this advantage was restricted to KRAS wild-type patients (RR = 1.48, [95 % CI 1.28–1.71]). BRAF mutation decreases tumor response in first-line treatment whether cetuximab was given or not in patients with KRAS wild-type, and anti-EGFR MoAb produces a clear benefit in response rate in patients with BRAF and KRAS wild-type.

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Acknowledgments

We would like to thank Professor Taixing Wu for the guide on methodology.

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Authors and Affiliations

  1. Division of Abdominal Cancer, West China Hospital, Sichuan University, No. 37, Guo Xue Xiang, Chengdu, 610041, Sichuan, China

    Dandan Cui, Dan Cao, Yu Yang, Meng Qiu & Cheng Yi

  2. Department of Pathophysiology, West China School of Preclinical and Forensic Medicine, Sichuan University, Chengdu, 610041, Sichuan, China

    Ying Huang

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  1. Dandan Cui
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  2. Dan Cao
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  3. Yu Yang
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  4. Meng Qiu
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  5. Ying Huang
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Correspondence to Ying Huang or Cheng Yi.

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Cui, D., Cao, D., Yang, Y. et al. Effect of BRAF V600E mutation on tumor response of anti-EGFR monoclonal antibodies for first-line metastatic colorectal cancer treatment: a meta-analysis of randomized studies. Mol Biol Rep 41, 1291–1298 (2014). https://doi.org/10.1007/s11033-013-2974-8

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  • DOI: https://doi.org/10.1007/s11033-013-2974-8

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