Efficacy and safety of durvalumab (anti-PD-L1) via IV infusion Q4W, in combination with vactosertib (TGF-beta inhibitor) PO bid for 5 days a week for up to a maximum of 12 months, will be tested in patients with metastatic hypermutated gastric cancers as ≥ 3rd-line setting until confirmed disease progression, unless there is unacceptable toxicity, withdrawal of consent, or another discontinuation criterion is met.
This trial will test the efficacy and safety of durvalumab in combination with vactosertib in patients with metastatic gastric cancers who failed ≥ 2 lines of chemotherapy