Clinical Hold Lifted on Mersana’s XMT-2056
FDA has lifted a clinical hold against Mersana Therapeutics’ Phase 1 clinical trial of XMT-2056, a systemically administered Immunosynthen STING-agonist antibody drug conjugate that is designed to target a novel human epidermal growth factor receptor 2 (HER2) epitope and locally activate STING signaling in both tumor-resident immune cells and in tumor cells. The company says the drug has the “potential to treat patients with HER2-high or -low tumors as monotherapy and in combination with standard-of-care agents.”
Mersana says “an in-depth analysis of cytokine, pharmacokinetic and other clinical data from patients enrolled in our Phase 1 trial indicated that XMT-2056 is a highly potent innate immune agonist. Based on these data and with patient safety at the forefront of our efforts, we have lowered the starting dose in our Phase 1 dose escalation design.”
The Phase 1 open-label trial is investigating the therapy in previously treated patients with advanced/recurrent solid tumors expressing HER2, including breast, gastric, colorectal and non-small-cell lung cancers, according to the company. “The dose escalation and dose expansion portions of the trial will evaluate and characterize the relationship of safety, tolerability and exposure of XMT-2056 and this candidate’s preliminary anti-tumor activity, as measured by overall response rate, duration of response and disease control rate,” it adds.