Clinical benefit of bevacizumab in Mexican ovarian cancer patients according to the intention of treatment by the oncologist.
e17097 Background: Ovarian cancer (OC) is the first cause of gynecological cancer, and the fifth cause of women cancer-death in US. In Mexico, more than 4,500 new cases of ovarian cancer are diagnosed yearly and it represents the second cause of gynecological cancer mortality. Bevacizumab (BVZ) is an antiangiogenic antibody that has been approved for first-line and recurrence therapy in OC patients. The aim of the study was to evaluate the clinical benefit of BVZ in different lines of treatment in Mexican OC patients. Methods: A total of 94 OC patients treated with BVZ were recruited at the Ovarian Cancer Program of the Instituto Nacional de Cancerología, from February 2012 to September 2018. Clinicopathological characteristics and toxicity was correlated with line of treatment. PFS curves were estimated by the Kaplan–Meier method, while comparisons among groups were analyzed with log-rank or Breslow tests. Results: Most of the patients were stage IIIC (69.1%) with HGSP histology (73.4%). 24 patients (25.5%) received BVZ as first-line treatment before debulking surgery (50% for suboptimal and 45.8% for optimal cytoreduction). 48 patients (51.1%) received BVZ for second-line (72.9% after a platinum-resistant and 27.1% after a platinum-sensitive recurrence) and 22 patients (23.4%) for three or more lines of treatment. Venous thromboembolic events (VTE) were more frequent in multi-treated patients ( P= 0.030). The median PFS was 23.7, 11.7 and 5.8 months for first, second and third or more lines, respectively. Patients with optimal debulking surgery had a better PFS compared with suboptimal and BVZ in first-line patients (24.8 vs 20.9; P= 0.050). Patients with BVZ in second-line who are a platinum-sensitive recurrence had better PFS compared to those with a platinum-resistant disease (15.1 vs 7.6; P= 0.040). Conclusions: OC patients had clinical benefit from treatment with BVZ when used as first-line and first recurrence treatments. The use of BVZ for third or later line treatment has a questionable benefit and is associated with a higher rate of VTE. Also, we highlight that 77% of the patients had the greatest-benefit while 33% had limited-benefit.