A study-level meta-analysis of efficacy data from head-to-head first-line trials of epidermal growth factor receptor inhibitors versus bevacizumab in patients with RAS wild-type metastatic colorectal cancer

Eur J Cancer. 2016 Nov;67:11-20. doi: 10.1016/j.ejca.2016.07.019. Epub 2016 Sep 1.

Abstract

Background: Head-to-head trials comparing first-line epidermal growth factor receptor inhibitor (EGFRI) versus vascular endothelial growth factor inhibitor (bevacizumab) therapy yielded differing results, and debate remains over optimal first-line therapy for patients with RAS wild-type (WT) metastatic colorectal cancer (mCRC).

Methods: A PubMed search identified first-line mCRC trials comparing EGFRI plus chemotherapy versus bevacizumab plus chemotherapy; data were subsequently updated using recent congress presentations. This study-level meta-analysis estimated the overall survival (OS) treatment effect of first-line chemotherapy plus EGFRIs or bevacizumab in patients with RAS WT mCRC. Secondary end-points were progression-free survival (PFS), objective response rate (ORR), resection rate and safety. Early tumour shrinkage (ETS) of ≥20% at week 8 was an exploratory end-point.

Results: Three trials comprising data from 1096 patients with RAS WT mCRC were included. OS (hazard ratio [HR]: 0.80 [95% confidence interval: 0.68-0.93]), ORR (odds ratio [OR]: 0.57) and ETS (OR: 0.48) favoured EGFRIs plus chemotherapy versus bevacizumab plus chemotherapy. PFS (HR: 0.98) and resections (OR: 0.93) were similar between treatments. For patients with KRAS exon 2 WT/'other' RAS mutant mCRC the OS HR was 0.70. A safety meta-analysis was not possible due to a lack of data; in the individual studies, skin toxicities and hypomagnesaemia were more common with EGFRIs, nausea and hypertension were more common with bevacizumab.

Conclusions: This meta-analysis supports a potential benefit for first-line EGFRI plus chemotherapy versus bevacizumab plus chemotherapy with respect to OS, ORR and ETS in patients with RAS WT mCRC. A patient-level meta-analysis is awaited.

Keywords: Bevacizumab; Cetuximab; Meta-analysis; Panitumumab; Progression-free survival; Survival.

Publication types

  • Comparative Study
  • Meta-Analysis

MeSH terms

  • Angiogenesis Inhibitors / therapeutic use*
  • Antibodies, Monoclonal / therapeutic use*
  • Antineoplastic Combined Chemotherapy Protocols / therapeutic use*
  • Bevacizumab / therapeutic use*
  • Cetuximab / therapeutic use*
  • Colorectal Neoplasms / drug therapy*
  • Colorectal Neoplasms / genetics
  • Colorectal Neoplasms / pathology
  • Disease-Free Survival
  • Drug Eruptions / etiology
  • ErbB Receptors / antagonists & inhibitors*
  • Humans
  • Magnesium / blood
  • Panitumumab
  • Survival Rate
  • Water-Electrolyte Imbalance / blood
  • Water-Electrolyte Imbalance / chemically induced
  • ras Proteins / genetics

Substances

  • Angiogenesis Inhibitors
  • Antibodies, Monoclonal
  • Bevacizumab
  • Panitumumab
  • EGFR protein, human
  • ErbB Receptors
  • ras Proteins
  • Magnesium
  • Cetuximab