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Best of Posters - IASLC Selection - Part 2 (ID 263)
- Event: WCLC 2013
- Type: Exhibit Showcase Session
- Presentations: 1
- Coordinates: 10/30/2013, 09:55 - 10:25, Exhibit Hall, Ground Level
P1.11-018 - An Open-Label, Multicenter, Randomized, Phase II Study of Cisplatin and Pemetrexed With or Without Cixutumumab (IMC-A12) as First-Line Therapy in Patients With Advanced Nonsquamous Non-Small Cell Lung Cancer (ID 1449)
09:55 - 10:25 | Author(s): K. Deppermann
Pemetrexed combined with cisplatin is an approved first-line treatment regimen for patients with advanced/metastatic nonsquamous non-small cell lung cancer (NSCLC). New targets are needed to further improve first-line therapy outcomes. Cixutumumab, a fully human IgG1 monoclonal antibody, specifically blocks the insulin-like growth factor-type 1 receptor, inhibiting its activation and signal transduction. Early studies have reported clinical efficacy and safety with cixutumumab. However, the clinical benefit of adding cixutumumab to conventional chemotherapy is yet to be established. This study assessed whether pemetrexed and cisplatin combined with cixutumumab was superior to pemetrexed and cisplatin as first-line therapy.
This open-label, multicenter, randomized, phase II study (N=172) enrolled patients ≥18 years of age with stage IV nonsquamous NSCLC and ECOG performance status 0–1. Patients were randomized (1:1) to receive cixutumumab 20 mg/kg combined with pemetrexed 500 mg/m and cisplatin 75 mg/m (cixutumumab arm; n=87) or pemetrexed and cisplatin (control arm; n=85) every 21 days up to 6 cycles of induction therapy. Patients eligible for maintenance therapy received pemetrexed and cixutumumab (cixutumumab arm) or pemetrexed (control arm). The primary endpoint was progression-free survival (PFS) based on radiographic assessments. To test for superiority (1-sided significance level 20%; study power 80%), a median PFS of 7.16 months in the cixutumumab arm (HR cixutumumab/control=0.74) was expected. Secondary endpoints included objective response rate (ORR), duration of response, and overall survival (OS). Adverse events (AEs) were assessed using CTCAE version 4.0. Between-arm comparisons of unstratified data are presented.
Baseline patient and disease characteristics were similar between arms in the intent-to-treat population. The mean age of the population was 59 years (range, 32 to 83). Dose intensity for all treatments was ≥90% during both study phases. Median PFS was 5.45 months (95% CI, 3.88–6.05) vs. 5.22 months (95% CI, 4.24–6.74) in the cixutumumab and control arms, respectively (HR 1.15, 95% CI, 0.81–1.61; P=0.440). ORR did not significantly differ between treatments (37.9% cixutumumab vs. 30.6% control; P=0.338); however, the median duration of response was numerically greater in the cixutumumab arm (4.9 months; 95% CI, 4.17–6.28) than in the control arm (3.91 months; 95% CI, 2.92–6.41), although differences were not significant (HR 0.74, 95% CI, 0.40–1.38; P=0.340). Median OS was 10.68 months (95% CI, 8.74–not evaluable) in cixutumumab vs. 10.38 months (95% CI, 7.43–14.39) in control patients (HR 0.85, 95% CI, 0.56–1.30; P=0.450). Common AEs reported in ≥10% of patients were nausea, hyperglycemia, fatigue, vomiting, and anemia. A greater proportion of patients in the cixutumumab arm (74.1%) had grade 3/4 AEs than patients in the control arm (61.7%). Grade 3/4 hyperglycemia occurred at a higher rate in the cixutumumab arm than the control arm (11.8% vs. 1.2%). One possibly cixutumumab-related death occurred during the study.
Superior PFS was not achieved in nonsquamous NSCLC patients when cixutumumab was added to the pemetrexed and cisplatin treatment regimen, and no significant improvement for any other endpoint was observed. Pemetrexed combined with cisplatin and cixutumumab was tolerable, with no new safety concerns reported.
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