AstraZeneca (LON: AZN) announced that Imfinzi (durvalumab) together with tremelimumab and platinum-based chemotherapy improved overall survival by 23% and progression-free survival by 28% compared to chemotherapy alone in patients with Stage IV (metastatic) non-small cell lung cancer (NSCLC). The data came from a Phase 3 trial known as POSEIDON. Imfinzi and tremelimumab are immune checkpoint…