HER3-DXd

This is a phase 1/2 multicenter, open-label umbrella platform study that will evaluate the safety and efficacy of sacituzumab tirumotecan (MK-2870) plus paclitaxel versus ramucirumab plus paclitaxel, and HER3-DXD plus ramucirumab versus ramucirumab plus paclitaxel for the treatment of participants with advanced or metastatic gastric adenocarcinoma, gastroesophageal junction (GEJ) adenocarcinoma, or esophageal adenocarcinoma who have failed 1 prior line of therapy. This is an estimation study, and no formal hypothesis testing will be performed.

This is a proof-of-concept study designed to investigate HER3-DXd monotherapy in locally advanced unresectable or metastatic solid tumors. The study is enrolling cohorts of participants with melanoma \[cutaneous/acral\], squamous cell carcinomas of the head and neck (SCCHN), HER2-negative gastric cancer ovarian carcinoma, cervical cancer, endometrial cancer, bladder cancer, esophageal carcinoma, pancreatic carcinoma, prostate cancer, second-line gastric cancer, lung cancer, and breast cancer.