On May 8, 2026, the Food and Drug Administration approved zenocutuzumab-zbco (Bizengri, Partner Therapeutics, Inc.) for adults with advanced, unresectable or metastatic cholangiocarcinoma harboring a neuregulin 1 (NRG1) gene fusion with disease progression on or after prior systemic therapy. NRG1-fusion positive cholangiocarcinoma is an extremely rare, life-threatening malignancy.