On September 12, 2022 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, reported that the U.S. Food and Drug Administration (FDA) has granted Fast Track designation to XMT-1660 for the treatment of adult patients with advanced or metastatic triple-negative breast cancer (TNBC) (Press release, Mersana Therapeutics, SEP 12, 2022, View Source [SID1234619425]). XMT-1660 is a B7-H4-directed Dolasynthen antibody drug conjugate with a precise, target-optimized drug-to-antibody ratio (DAR 6) and Mersana’s clinically validated DolaLock microtubule inhibitor payload with controlled bystander effect.
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"While breast cancer remains an area of high unmet need, TNBC is associated with particularly poor outcomes and very limited treatment options," said Anna Protopapas, President and Chief Executive Officer of Mersana Therapeutics. "XMT-1660 has demonstrated promising anti-tumor effects in preclinical studies, and we are excited to have recently initiated our Phase 1 trial to investigate its safety and clinical activity. This Fast Track designation allows for a potentially accelerated regulatory review of XMT-1660 as we seek to offer a new therapy for patients living with a range of B7-H4 expressing tumors."
Mersana’s ongoing multicenter Phase 1 trial is investigating the safety, tolerability and anti-tumor activity of XMT-1660 in patients with solid tumors, including in breast, endometrial and ovarian cancers. The initial dose escalation portion of this trial will evaluate the safety and tolerability of XMT-1660. The dose expansion portion of the trial will evaluate the safety, tolerability and efficacy of XMT-1660.
The FDA’s Fast Track program is designed to facilitate the development and expedite the review of drug candidates to treat serious conditions and fill an unmet medical need. A product candidate that is granted Fast Track designation may be eligible for several benefits, including more frequent meetings and communications with the FDA and, if certain criteria are met, the potential for Accelerated Approval, Priority Review or Rolling Review of a Biologics License Application (BLA) by the FDA.