FDA Breakthrough for NRG1+ Cholangiocarcinoma Drug
FDA has granted Partner Therapeutics a breakthrough therapy designation for zenocutuzumab-zbco and its use for treating cholangiocarcinoma defined by NRG1 gene fusions. The designation covers adults with advanced unresectable or metastatic NRG1+ cholangiocarcinoma, the company says, and is based on data from the Phase 2 eNRGy trial. The company says NRG1 fusions are a rare but increasingly recognized target as RNA-based next-generation sequencing proliferates in clinical practice.
Partner says a recent interim readout of the trial found:
• 37% overall response rate
• 7.4 months median duration of response
• 1.9 months median time to response
• 9.2 months median progression-free survival
• 58% clinical benefit rate (responses or durable stable disease)
PTx plans to leverage those results for a supplemental BLA filing in 2026. Zenocutuzumab-zbco (Bizengri) currently has accelerated approval for NRG1-positive non-small cell lung cancer and pancreatic cancer after prior therapy.