NCT05294172 2026-05-08KL-A167 Injection Combined With Cisplatin and Gemcitabine vs Placebo Combined With Cisplatin and Gemcitabine in the Treatment of Recurrent or Metastatic Nasopharyngeal CarcinomaSichuan Kelun-Biotech Biopharmaceutical Co., Ltd.Phase 3 Active not recruiting295 enrolled