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R.K. Galiulin
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P3.01 - Poster Session/ Treatment of Advanced Diseases – NSCLC (ID 208)
- Event: WCLC 2015
- Type: Poster
- Track: Treatment of Advanced Diseases - NSCLC
- Presentations: 1
- Moderators:
- Coordinates: 9/09/2015, 09:30 - 17:00, Exhibit Hall (Hall B+C)
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P3.01-072 - Final Efficacy and Safety Results of ECOG Performance Status (PS) Subgroup Analyses From the SQUIRE Phase III Study (ID 1660)
09:30 - 09:30 | Author(s): R.K. Galiulin
- Abstract
Background:
As previously reported, the SQUIRE study demonstrated that the addition of necitumumab (N) to gemcitabine-cisplatin (GC) chemotherapy significantly improved survival in patients with stage IV squamous NSCLC. Overall survival (OS), progression-free survival (PFS), and safety results are presented for Eastern Cooperative Oncology Group (ECOG) PS 0–1/2 subgroups.
Methods:
Patients with stage IV squamous NSCLC were randomized 1:1 to N (800 mg iv, days 1 and 8) plus GC (G=1250 mg/m² iv, days 1 and 8; C=75 mg/m² iv, day 1) or GC alone every 21 days for up to six cycles in this multicenter, open-label study. N+GC patients without progression continued on N alone until progressive disease or intolerable toxicity. The study was powered for OS and PFS (previously reported). Preplanned subgroup analyses were performed for ECOG PS 0–1 and 2.
Results:
Subgroups PS 0–1/2 (n=996 [91%]/n=96 [9%]) were well balanced regarding baseline characteristics (males, 83% vs 86%; median age, 62 vs 65 yrs; smoking/ex-light smoker/nonsmoker, 91/4/5% vs 89/6/5%). GC median relative dose intensity was similar between PS 0–1/2 subgroups; N (overall) was higher for the PS 0–1 than for PS 2 subgroup (94.8% and 90.0%). Post-study therapy use was generally higher in the PS 0–1 than in the PS 2 subgroup, but was balanced between both arms. The OS hazard ratio (HR) for N+GC vs. GC was 0.85 (95% CI: 0.74, 0.98; p=0.026) for PS 0–1 and 0.78 (95% CI: 0.51, 1.21; p=0.275) for PS 2. The PFS HR (N+GC vs. GC) was 0.86 (95% CI: 0.75, 0.99; p=0.035) for PS 0–1 and 0.79 (95% CI: 0.50, 1.24; p=0.292) for PS 2. Select Grade ≥3 treatment-emergent adverse events (TEAEs) are shown in the table. The percentage of patients with adverse events leading to discontinuation of any study drug was lower in the PS 0–1 subgroup (N+GC=30%; GC=23%) than the PS 2 subgroup (N+GC=42%; GC=41%). The percentage of patients hospitalized was higher in the PS 0–1 subgroup (N+GC=43%; GC=34%) than the PS2 subgroup (N+GC=25%; GC=30%). Table. Select TEAEs
[*][Adverse events of possible relevance to treatment, according to either composite categories or preferred terms (febrile neutropenia only)]Grade ≥3 Event* PS 0-1 N+GC (%) N=490 PS 0-1 GC (%) N=495 PS 2 N+GC (%) N=48 PS 2 GC (%) N=46 Neutropenia 25.5 28.1 12.5 21.7 Febrile neutropenia 0.6 1.4 2.1 0 Anemia 11.2 10.3 4.2 17.4 Thrombocytopenia 10.4 10.5 8.3 13.0 Fatigue 7.1 7.1 8.3 6.5 Hypomagnesemia 9.8 1.0 4.2 2.2 Rash 7.8 0.4 0 0 Arterial thromboembolic events 3.7 1.8 6.3 4.3 Venous thromboembolic events 5.5 2.6 0 2.2
Conclusion:
OS and PFS treatment results for N+GC were consistent and considered favorable across subgroups including ECOG PS 2 patients. Administration of N+GC was well tolerated in PS 2 patients, with no evidence of an increased safety risk in this subgroup.
