1470P - First real life data on durvalumab after definitive concomitant chemoradiotherapy (cCRT) in unresectable stage (St) III non-small cell lung cancer (NSCLC) in France: Analysis of 591 patients (pts) enrolled in the French cohort (c) temporary authorization of use (ATU)

Among pts with St III unresectable NSCLC, only 15% are alive at 5 years with the historical Standard of Care (SoC) of definitive cCRT. Durvalumab, a human monoclonal anti-PD-L1 antibody, demonstrated efficacy in PFS and OS and was approved in Europe on September 2018 for the treatment of St III unresectable NSCLC expressing PD-L1 ≥ 1% and without progression after CRT. ATU permits the access to innovative medicines for pts without alternatives before a market authorization is granted. Durvalumab was administrated to pts as a 60min intravenous infusion at 10mg/kg every 2 weeks for a maximum of 12 months, or discontinuation due to progressive disease, Adverse Events (AE) or switch to commercial drug. Pts characteristics and safety data were prospectively collected during cATU. From March 26th to October 28th 2018, 188 sites requested a cATU for 591 pts with St III unresectable NSCLC who did not progress after cCRT, independently of their PD-L1 status. 561 pts were treated by Durvalumab (27 pts were treated with the commercial drug & 3 pts were lost to follow-up). 71.6% of pts were men, median age was 62.4±8.9 years. 51.7% of tumours were adenocarcinoma. 40.5% of pts were in St IIIA, 51.8% in St IIIB and 6.2% in St IIIC. All pts were treated with platinum-based cCRT, with a median dose of 66Gy [45.0-74.0] and 54% with cisplatin-based chemotherapy. Best response to cCRT was partial response for 78.5% of pts, complete response for 6.3% and stable disease for 15.2%. By January 2019, 82.1 % of pts were still under Durvalumab and 46.3% pts treated more than 6 months. Overall, drug related AEs occurred in 17.3% of pts including 8.2% serious AEs. Most common Durvalumab related AEs (all grades) were hyperthyroidism (1.2%) and pneumonitis (1.1% or n=6, including one death). Discontinuation occurred in 17.8% of pts, of which 5.2% were Durvalumab related. These data confirm that Durvalumab has a manageable safety profile in real-life practice. Enrollment of 591 pts in 7 months highlights the high unmet need for stage III unresectable NSCLC pts and supports Durvalumab treatment as the new SoC. AstraZeneca. AstraZeneca. V. Avrillon: Advisory / Consultancy: Bristol-Myers Squibb (BMS); Travel / Accommodation / Expenses, congress invitation: Merck Sharp & Dohme (MSD); Advisory / Consultancy: AbbVie; Advisory / Consultancy: Bristol-Myers Squibb (BMS); Advisory / Consultancy: AbbVie; Travel / Accommodation / Expenses: MSD. E. Pichon: Travel / Accommodation / Expenses: Bristol-