Bleeding events in bevacizumab-treated cancer patients who received full-dose anticoagulation and remained on study

N B Leighl, J Bennouna, J Yi, N Moore, J Hambleton, H Hurwitz, N B Leighl, J Bennouna, J Yi, N Moore, J Hambleton, H Hurwitz

Abstract

Background: Bevacizumab provides clinical benefit in multiple solid tumours, but is associated with some increase in bleeding risk. Thrombotic events necessitating therapeutic anticoagulation (TA) are common in cancer. This report describes the safety of concurrent bevacizumab and TA in three large placebo-controlled clinical studies.

Methods: Study 1 (metastatic colorectal cancer (mCRC)), study 2 (mCRC), and study 3 (advanced non-small cell lung cancer) were blinded phase III studies. Eligibility criteria excluded patients on TA. Patients on protocol treatment who developed thrombotic events requiring TA were permitted to continue bevacizumab or placebo under specified conditions. Adverse events in patients who received bevacizumab and TA concurrently were assessed using the NCI-CTCAE scale.

Results: While experience is limited, venous thrombotic events were the most common reason for TA initiation in the three studies. Severe bleeding event rates for patients receiving TA in the bevacizumab-treated groups were similar in frequency to the placebo groups, ranging from 0 to 8% or 0 to 67 events per 100 patient-years. No severe pulmonary bleeding was reported in any of the TA-treated populations.

Conclusions: These data suggest that bevacizumab did not increase the risk of severe bleeding in cancer patients who received TA.

Trial registration: ClinicalTrials.gov NCT00062426 NCT00806923.

Figures

Figure 1
Figure 1
Study flow charts for patients with treatment emergent VTE.

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