AstraZeneca reports results from the ARCTIC trial in third-line non-small cell lung cancer

AstraZeneca and MedImmune announced high-level results from the Phase III ARCTIC trial in patients with locally-advanced or metastatic non-small cell lung cancer (NSCLC) who have received at least two prior treatments. This randomised, open-label, multi-centre trial assessed the efficacy and safety of the combination of Imfinzi (durvalumab) plus tremelimumab, as well as Imfinzi and tremelimumab monotherapies, versus standard-of-care chemotherapy (SoC) in patients with PDL1-low/negative NSCLC (sub-study B), and Imfinzi monotherapy versus SoC in patients with PDL1-high NSCLC (sub-study A).

In sub-study B, the combination of Imfinzi plus tremelimumab in patients with PD-L1 low/negative NSCLC did not meet the primary endpoints of a statistically-significant and clinically-meaningful improvement in progression-free survival (PFS) and overall survival (OS) compared to SoC. Activity and safety of monotherapy arms of sub-study B were consistent with prior published data.

Sub-study A was not powered for statistical significance; however, Imfinzi monotherapy showed a clinically-meaningful reduction in the risk of death compared to chemotherapy.

Full data from the ARCTIC trial will be presented at a forthcoming medical meeting.

Sean Bohen, Executive Vice President, Global Medicines Development and Chief Medical Officer, said: “While we are disappointed that the combination of Imfinzi plus tremelimumab did not result in a statistically-significant survival benefit in this heavily pre-treated patient population, we are encouraged by the activity of Imfinzi monotherapy observed in this trial and look forward to presenting the full data from the ARCTIC trial at an upcoming medical meeting.”

AstraZeneca recently received approval from the US FDA for Imfinzi for the treatment of patients with unresectable, Stage III NSCLC whose disease has not progressed following concurrent platinum-based chemotherapy and radiation therapy.