Bleeding with vascular endothelial growth factor tyrosine kinase inhibitor: A network meta-analysis.

Background: Targeted therapies like vascular endothelial growth factor receptor tyrosine kinase inhibitors (VEGFR-TKIs) are the first-choice treatment in several types of cancers. We aim to determine the comparative risk of bleeding events associated with the VEGFR-TKIs through a network meta-analysis.

Methods: Published data search up to November 2018 reporting bleeding in cancer patients treated with VEGFR-TKIs was performed. The primary outcome was presence of hemorrhagic events at the end of the trial. Bleeding as a side-effect profile was examined for eleven VEGFR-TKIs (Apatinib, Brivanib, Cabozantinib, Lenvatinib, Motesanib, Nintedanib, Pazopanib, Regorafenib, Sorafenib, Sunitinib and Vandetanib). Network meta-analysis based on random effects model estimating Odds Ratio (OR) with 95 % confidence interval (CI), compared the risk of bleeding events among the VEGFR-TKIs with respect to placebo control conditions.

Results: Fifty Randomized Clinical Trials (RCTs) including 16,753 cancer patients were included in this analysis. Twenty studies compared VEGFR-TKIs with placebo, the remaining studies compared VEGFR-TKIs with the standard chemotherapeutic regimen. VEGFR-TKIs were associated with increased incidence of all-grade hemorrhagic events in comparison to control (standard chemotherapy and/or placebo) (OR = 1.79; 95 % CI 1.50-2.13, p-value <0.0001) and placebo (OR = 1.50; 95 % CI 1.16-1.93, p-value = 0.1). However, there was no difference in high-grade bleeding in patients treated with VEGFR-TKI in comparison to control (OR = 1.22; 95 % CI 0.87-1.71, p-value 0.74) or placebo alone (OR = 1.05; 95 % CI 0.65-1.70, p-value 0.73). Among individual VEGFR-TKIs, Sunitinib (OR = 3.31, 95 % CI 2.34-4.69) and Regorafenib (OR = 2.92, 95 % CI 1.50-5.71) were associated with higher risk of hemorrhagic events in comparison to placebo.

Conclusion: VEGR-TKIs, particularly Sunitinib and Regorafenib appear to be associated with increased risk of bleeding incidence.

Trial Registration Number: PROSPERO CRD42017056406.