Amgen’s Phase III DeLLphi-305 study deliverers strong results

9 September 2026

US biotech major Amgen (Nasdaq: AMGN) has announced landmark results from the Phase III DeLLphi-305 study, which met its primary endpoint at a pre-specified interim analysis, demonstrating a statistically-significant and clinically-meaningful improvement in overall survival with Imdelltra (tarlatamab-dlle) in combination with AstraZeneca’s (LSE: AZN) Imfinzi (durvalumab) compared to durvalumab alone.

This study tested Imdelltra as a first-line maintenance treatment for people with extensive stage small cell lung cancer (ES-SCLC) whose disease had not progressed following initial treatment with durvalumab, platinum-based chemotherapy and etoposide. The study also demonstrated a statistically-significant and clinically meaningful improvement in progression-free survival (PFS) and objective response rate (ORR) among patients treated with Imdelltra in combination with durvalumab.

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