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MA 10 - Immunotherapy I (ID 664)
- Event: WCLC 2017
- Type: Mini Oral
- Track: Immunology and Immunotherapy
- Presentations: 1
MA 10.03 - 3-Year Survival and Duration of Response in Randomized Phase II Study of Atezolizumab vs Docetaxel in 2L/3L NSCLC (POPLAR) (ID 8703)
11:00 - 12:30 | Author(s): F. Braiteh
Atezolizumab (anti–PD-L1) has demonstrated OS benefit over docetaxel in a randomized Phase II study, POPLAR, in patients with advanced NSCLC. This benefit has been confirmed in the randomized Phase III study OAK (Rittmeyer, 2017). The 3-year survival analysis of the POPLAR study presented here describes the longest survival follow-up reported to date of an all-comer randomized PD-L1/PD-1 immunotherapy trial in 2L+ NSCLC.
Patients were randomized 1:1 to receive atezolizumab (1200 mg) or docetaxel (75 mg/m) IV q3w. Tumors were prospectively evaluated for tumor cell (TC) or tumor-infiltrating immune cell (IC) PD-L1 expression using the VENTANA SP142 IHC assay. Landmark OS was estimated using the Kaplan-Meier method. Data cutoff, April 7, 2017; minimum follow-up, 3 years.
The 2-year and 3-year survival with atezolizumab vs docetaxel were 32.2% vs 16.6% and 18.7% vs 10.0%, respectively. The long-term OS benefit of atezolizumab vs docetaxel was observed across histology and PD-L1 expression subgroups (Table). While the TC3 or IC3 subgroup derived the greatest OS benefit, the TC0 and IC0 subgroup also had improved long-term OS with atezolizumab vs docetaxel. The ITT ORR was 15% in both atezolizumab and docetaxel arms, but the median duration of response was 3 times longer with atezolizumab (22.3 months [95% CI: 11.6, 31.1] vs 7.2 months [95% CI: 5.8, 12.2] with docetaxel). Seven of the 11 docetaxel-arm 3-year survivors received subsequent non-protocol therapy with anti–PD-L1/PD-1 agents. Atezolizumab had a favorable safety profile compared with docetaxel that was consistent with previous reports.
Atezolizumab demonstrates superior 2-year and 3-year OS benefit compared with docetaxel, and this benefit is observed across histology and PD-L1 expression subgroups (including TC0 and IC0). Atezolizumab is well tolerated, and responses are highly durable. These results are consistent with long-term OS results from OAK, presented separately.
Table. Landmark OS in the ITT, PD-L1 expression, and histology subgroups in POPLAR Population (n, atezolizumab vs docetaxel) 2-year OS rate, % 3-year OS rate, % Atezolizumab Docetaxel P value[a] Atezolizumab Docetaxel P value[a] ITT (144 vs 143) 32.2% 16.6% 0.0027 18.7% 10.0% 0.0419 PD-L1 Expression Subgroups TC3 or IC3 (24 vs 23) 41.7% 19.9% 0.1003 37.5% 14.9% 0.0724 TC2/3 or IC2/3 (50 vs 55) 36.1% 13.8% 0.0082 21.2% 9.9% 0.1166 TC1/2/3 or IC1/2/3 (93 vs 102) 36.0% 19.8% 0.0124 18.0% 11.0% 0.1759 TC0 and IC0 (51 vs 41) 25.0% 6.8% 0.0202 20.5% 6.8% 0.0693 Histology Subgroups Non-squamous (95 vs 95) 32.2% 21.1% 0.0960 23.3% 12.4% 0.0585 Squamous (49 vs 48) 32.7% 7.8% 0.0020 9.4% 5.2% 0.4603 [a ]For descriptive purpose only. TC3 or IC3 = PD-L1 ≥ 50% TC or 10% IC; TC2/3 or IC2/3 = PD-L1 ≥ 5% TC or IC; TC1/2/3 or IC1/2/3 = PD-L1 ≥ 1% on TC or IC; TC0 and IC0 = PD-L1 < 1% on TC and IC. NCT01903993.
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