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AACR 2024 | Mirvetuximab soravtansine with pembrolizumab in MSS endometrial cancer

Rebecca Porter, MD, PhD, Dana-Farber Cancer Institute, Boston, MA, discusses findings from a Phase II trial (NCT03835819) of mirvetuximab soravtansine (MIRV) with pembrolizumab in patients with recurrent/persistent endometrial cancer (EC) expressing folate receptor-alpha (FRα). Among treated patients, a notable objective response rate (ORR) and stable disease were observed, meeting the study’s primary endpoints. Adverse events were manageable, with ocular toxicities reported. Further investigations are warranted to identify responsive subpopulations. This interview took place at American Association for Cancer Research (AACR) Annual Meeting 2024 in San Diego, CA.

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Transcript (edited for clarity)

Sure. So this was a Phase II trial. It was a two stage design and we rolled a total of 16 patients. All patients received the combination of mirvetuximab soravtansine, which is a folate receptor alpha targeting antibody drug conjugate, and pembrolizumab, an immune checkpoint inhibitor. And there’s a lot of pre-clinical data to support that concept of combining ADCs and immune checkpoint blockade, which was the basis for this study...

Sure. So this was a Phase II trial. It was a two stage design and we rolled a total of 16 patients. All patients received the combination of mirvetuximab soravtansine, which is a folate receptor alpha targeting antibody drug conjugate, and pembrolizumab, an immune checkpoint inhibitor. And there’s a lot of pre-clinical data to support that concept of combining ADCs and immune checkpoint blockade, which was the basis for this study. And this was in patients specifically with serious endometrial cancer that are mismatch repair proficient, so wouldn’t be expected to respond well to immunotherapy alone. All patients received the therapy. And I think the notable thing is that the response rate was really favorable for this population of patients with six patients having an objective response, one with a confirmed complete response and then three confirmed and two unconfirmed partial responses.

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