Comparison with AURELIA
Dr. Roque and the invited discussant, Thomas J. Herzog, MD, of the University of Cincinnati Cancer Center in Ohio, both compared results of the current trial to results from the AURELIA trial, in which patients with platinum-resistant ovarian cancers were randomized to chemotherapy with or without bevacizumab.
According to AURELIA data published in 2014, the ORR with the bevacizumab-chemotherapy combination was 27%, compared with 33% with ixabepilone-bevacizumab in the current trial. The median PFS was 6.7 months and 5.5 months, respectively, and the median OS was 16.6 months and 10 months, respectively.
An analysis of AURELIA data published in 2015 suggested that outcomes were even better for patients who received paclitaxel plus bevacizumab. This group had an ORR of 53.3%, a median PFS of 10.4 months, and a median OS of 22.4 months.
Though the current study’s results don’t appear to measure up to results from AURELIA, Dr. Herzog called the current study “very exciting.”
“The efficacy looks very promising,” he said. “They even showed efficacy for OS that looked very interesting, even though that was underpowered.”
Dr. Herzog did note the lack of a companion diagnostic because the TUBB3 staining did not correlate with response. He also said the trial was limited by the lack of a bevacizumab control arm. Furthermore, because of the relatively small sample size in the combination group (n = 39), the lower bound of the confidence interval for ORR includes response rates typically seen with conventional therapies.
“I do think that the combination does make sense biologically, so I’d like to see more data on that,” he concluded.
The trial was sponsored by Yale University, with study drug supplied by R-Pharm-US. Dr. Roque reported no conflicts of interest. Dr. Herzog disclosed serving as a scientific advisor to several companies, including Genentech, maker of bevacizumab.