The Effect of Perioperative Bevacizumab on Disease-Free and Overall Survival in Locally Advanced HER-2 Negative Breast Cancer: A Meta-Analysis.

Introduction: Multiple trials demonstrated that adding Bevacizumab to the standard neoadjuvant chemotherapy in HER-2 negative breast cancer increases pathological complete response. We conducted this meta-analysis to evaluate that effect on survival.

Methods: We performed a systematic search for randomized trials measuring the effect of adding either neoadjuvant or adjuvant Bevacizumab to the standard chemotherapy on disease-free and overall survival in breast cancer surgical candidates. The Mantel-Haenszel method and random effect model were used to analyze the data. A total of 7 randomized controlled trials were included in the analysis with a mean follow-up of 45 months.

Results: No statistically significant difference in overall survival was found after adding Bevacizumab to the standard chemotherapy in the overall study population, HR=0.9, 95% CI (90.72-1.13), estrogen/ progesterone positive subgroup, HR=0.99, 95% CI (0.72-1.35), or in triple negative breast cancer, HR=0.88, 95% CI (0.77-1.01). However, there was a small but significant improvement in disease-free survival in triple negative breast cancer with a HR of 0.88, 95% CI (0.78-0.98), but not in estrogen/ progesterone receptor positive tumors, HR=1.01, 95% CI (0.81-1.26).

Conclusions: The addition of Bevacizumab along with the standard chemotherapy would not improve overall survival in breast cancer surgical candidates, however, due to a small but significant improvement on disease-free survival in triple negative breast cancer, that would not eliminate the possibility of a certain subgroup of the latter who might benefit from adding Bevacizumab.