Bifunctional protein shows promise in HPV-related cancers
Source: www.medpagetoday.com Author: Charles Bankhead, Senior Editor, MedPage Today September A bifunctional fusion protein with immunotherapeutic activity proved active in advanced, difficult-to-treat cancers associated with human papillomavirus (HPV), according to pooled data from two prospective studies. Overall, 21 of 75 patients had confirmed responses with bintrafusp alfa, which inhibits tumor growth factor-beta (TGF-β) and PD-L1 interaction with its receptor. Responses were durable in many cases and occurred in patients with a variety of HPV-associated cancers. With a median follow-up of 33 months, the two cohorts had a median overall survival (OS) of 21.3 months, reported James Gulley, MD, PhD, of the National Cancer Institute in Bethesda, Maryland, during the virtual European Society for Medical Oncology (ESMO) meeting. "Overall survival appears to have a plateau of around 40-45% out to beyond 3 years," said Gulley. "The median survival compares favorably to the reported overall survival with PD-1 inhibitors of 8 to 12 months." "The need for effective treatment options in patients with HPV-associated malignancies is high," he added. "Therefore, these results showing efficacy of bintrafusp alfa across different HPV-related tumor types are of interest. Clinical trials of bintrafusp alfa in HPV-associated malignancies are ongoing." The frequency and durability of responses are "really remarkable in a quite difficult-to-treat patient population," said ESMO invited discussant Sebastian Kobold, MD, of Ludwig Maximilian University in Munich. "It's especially stunning because we all know that cervical cancers in previous trials have shown rather disappointing results with PD-1-targeting single agents, indicating that's [the anti-PD-1 component of the [...]