Checkpoint blockade with the PD-1 inhibitor balstilimab, alone or in combination with the anti-CTLA-4 drug zalifrelimab, showed activity in women with recurrent or metastatic cervical cancer, preliminary results from two phase II trials indicated.
In patients treated with balstilimab alone, the overall response rate (ORR) was 14%, including complete responses in 2%, reported David O’Malley, MD, of the Ohio State University Comprehensive Cancer Center in Columbus.
And in those who received both investigational agents — balstilimab plus zalifrelimab — the ORR increased to 22%, including complete responses in 6%.
“What is really interesting about the combination arm is that while we did see a median duration of response in the single-agent [arm] that was a very impressive 15 months, the duration of response has not been reached in the combination arm,” O’Malley told MedPage Today.
He said that the tripling of the complete response rate as well as the better