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PL04a - Plenary Session: Immune Checkpoint Inhibitors in Advanced NSCLC (ID 430)
- Event: WCLC 2016
- Type: Plenary
- Track: Chemotherapy/Targeted Therapy/Immunotherapy
- Presentations: 1
PL04a.03 - Durvalumab in ≥3rd-Line Locally Advanced or Metastatic, EGFR/ALK Wild-Type NSCLC: Results from the Phase 2 ATLANTIC Study (Abstract under Embargo until December 7, 7:00 CET) (ID 5336)
08:45 - 09:40 | Author(s): J. Powderly
Treatment with anti-PD-1/PD-L1 antibodies has demonstrated meaningful clinical benefit in patients with advanced NSCLC. Patients that progress after 2 lines of chemotherapy have few treatment options and poor outcomes. Durvalumab is an engineered human IgG1 mAb targeting programmed cell death ligand-1 (PD-L1).
ATLANTIC (NCT02087423) is a Phase 2, open-label, single-arm trial in patients with locally advanced or metastatic Stage IIIB–IV NSCLC (WHO PS 0 or 1; ≥2 prior systemic treatment regimens, including one platinum-based). There was no maximum number of prior treatments. The study initially enrolled all-comers and then was restricted to patients with PD-L1 high tumours (≥25% of tumour cells with membrane staining). The study includes three cohorts; here we report final results in Cohorts 2 and 3 that had EGFR/ALK wild-type or unknown status. Patients enrolled in Cohort 3 had ≥90% of tumour cells with PD-L1 staining. The primary endpoint is ORR (RECIST v1.1), based on independent central review. Secondary endpoints include DCR, DoR, PFS, OS, and safety (CTCAE v4.03).
As of 3 June 2016, in Cohorts 2/3, 265/68 patients (median age 62/61 years, 67/72% PS 1, 21/29% squamous histology; mean of 3.2/2.6 prior therapies) had received durvalumab (10 mg/kg i.v. q2w). Responses were durable; in Cohort 2, patients with PD-L1 ≥25%, the ORR was similar in patients with squamous and non-squamous histology.
Most AEs were low grade and resolved with treatment delay and/or immunosuppressive interventions. Overall, 10.2% of patients had Grade ≥3 treatment-related AEs and 2.7% had treatment-related AEs leading to discontinuation.
Cohort 2 Cohort 3 PD-L1 high (≥25%) PD-L1 low/negative (<25%) PD-L1 ≥90% n=146 n=93 n=68 ORR,* %(95%CI) 16.4(10.8-23.5) 7.5(3.1-14.9) 30.9(20.2-43.3) DCR, %(95%CI) 28.8(21.6-36.8) 20.4(12.8-30.1) 38.2(26.7-50.8) mDoR, months(25[th], 75[th] percentile) 12.3(7.5-NR) NR(7.2-NR) NR; 18/21 responders progression free at DCO n=149 n=94 n=67 mPFS, months(95%CI) 3.3(1.9-3.7) 1.9(1.8-1.9) 2.4(1.8-5.5) mOS, months(95%CI) 10.9(8.6-13.6) 9.3(5.9-10.8) NR(5.9-NC) 1-year OS, %(95%CI) 47.7(39.3-55.5) 34.5(25.0-44.1) 50.8(36.9-63.2) mFollow-up for OS, months 9.4 9.3 7.0 *Confirmed response per independent central review. DCO=data cutoff; DCR=disease control rate (complete response, partial response or stable disease ≥24 weeks); DoR=duration of response; m=median; NC=not calculated; NR=not reached; ORR=objective response rate; OS=overall survival; PFS=progression-free survival
Durvalumab was active and led to durable responses in a heavily pretreated metastatic NSCLC population; activity was numerically greater for patients whose tumours exceeded the 25% PD-L1 cutoff. The tolerability profile was manageable. Results are consistent with other anti-PD-1/PD-L1 therapies in metastatic, relapsed NSCLC and support further development of durvalumab.
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