Mersana Therapeutics Announces Completion of Enrollment in UPLIFT, a Single-Arm Registrational Trial of Upifitamab Rilsodotin (UpRi) in Platinum-Resistant Ovarian Cancer

• Topline data from UPLIFT expected in mid-2023
  
• Targeting potential Biologics License Application (BLA) submission by the end of 2023

Excerpt from the Press Release:

CAMBRIDGE, Mass., Oct. 06, 2022 (GLOBE NEWSWIRE) — Mersana Therapeutics, Inc. (NASDAQ: MRSN), a clinical-stage biopharmaceutical company focused on discovering and developing a pipeline of antibody-drug conjugates (ADCs) targeting cancers in areas of high unmet medical need, today announced the completion of patient enrollment in UPLIFT, the company’s single-arm registrational trial of UpRi in platinum-resistant ovarian cancer. UpRi is Mersana’s first-in-class NaPi2b-targeting ADC with a novel scaffold-linker-payload that enables a high drug-to-antibody ratio and controlled bystander effect.

“The completion of enrollment in UPLIFT moves us one step closer to our goal of establishing UpRi as a foundational therapy for ovarian cancer,” said Anna Protopapas, President and Chief Executive Officer of Mersana Therapeutics. “Thanks in large part to the enthusiasm we have seen about UpRi among global investigators, the significant unmet needs of patients in the platinum-resistant setting and strong execution from our team, we were able to enroll more than 270 patients in this trial within approximately a year. As a result, we believe we will have a robust data set for a planned topline data readout from UPLIFT in mid-2023 and, assuming positive data, a potential U.S. Food and Drug Administration BLA submission by the end of 2023. We extend our sincere thanks to the patients, caregivers, clinical investigators and staff who are participating in UPLIFT.”

UPLIFT is a single-arm clinical trial evaluating the safety and efficacy of UpRi in patients with platinum-resistant ovarian cancer who have received up to four prior lines of therapy. Patients with three or four prior lines of therapy were able to enroll in UPLIFT without regard to prior bevacizumab treatment. The trial enrolled a total of 272 patients to receive a 36 mg/m² dose of UpRi every four weeks. While NaPi2b testing of patient tumor samples is ongoing, the company expects that it will exceed its targeted number of NaPi2b positive patients in UPLIFT. The trial’s primary endpoint is the objective response rate (ORR) in the NaPi2b positive population, and secondary endpoints include the ORR regardless of NaPi2b expression, as well as duration of objective response and incidence and severity of adverse events.

About Mersana Therapeutics
Mersana Therapeutics is a clinical-stage biopharmaceutical company using its differentiated and proprietary ADC platforms to rapidly develop novel ADCs with optimal efficacy, safety and tolerability to meaningfully improve the lives of people fighting cancer.

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