Blairsville

Researchers are evaluating a combination of disitamab vedotin and tucatinib for treating patients with advanced or metastatic breast cancer or gastric cancer that express the HER2 protein. These solid tumors, which arise in organs like the breast or stomach, are challenging to treat once they have spread or grown larger. The trial focuses on patients whose tumors have HER2, a marker that can make the cancer grow and spread faster. The study aims to assess the safety and effectiveness of this drug combination in these cancers. The study includes a dose escalation phase where disitamab vedotin is given intravenously while tucatinib is taken orally twice daily at 300 mg. After determining two appropriate dose levels, the study proceeds to a dose optimization phase to evaluate safety and efficacy in different patient groups based on HER2 expression and cancer type. Following this, an expansion phase will test the treatment in four specific cohorts, including HER2-low and HER2-positive breast and gastric cancers. Participants will have regular assessments including monitoring for side effects, laboratory tests, and scans to evaluate tumor response using RECIST criteria. Safety will be followed for up to approximately five years after the last treatment dose. Key outcomes measured include the number of participants experiencing dose-limiting toxicities, adverse events, laboratory abnormalities, and dose changes. The study also tracks the objective response rate to the treatment over about three years.