Safety and Efficacy Analysis by Histology of Weekly Nab-Paclitaxel in Combination with Carboplatin As First-Line Therapy in Patients (pts) with Advanced Non-Small Cell Lung Cancer (NSCLC).

7592 Background: Treatment of advanced NSCLC differs by histology, with fewer options and poorer outcomes in pts with squamous histology. In a phase III trial of nab-paclitaxel (nab-P, 130 nm albumin-bound paclitaxel particles) + carboplatin (C) vs solvent-based paclitaxel (sb-P) + C, the primary endpoint of ORR was significantly improved from 25% to 33%, p = 0.005, with a 1-month improvement in OS (p = NS) and improved safety. This analysis evaluated efficacy and safety by histology. Methods: Pts with untreated stage IIIB/IV NSCLC were randomized 1:1 (stratified by age, histology, region, stage, and gender) to C AUC 6 day 1 and either nab-P 100 mg/m2 on days 1, 8, 15 or sb-P 200 mg/m2 day 1 q 21 days. ORR and PFS were determined by blinded centralized review. Results: In squamous pts, nab-P/C produced a significantly higher ORR (41% vs 24%, p < 0.001), similar PFS (5.6 vs 5.7 mo, HR: 0.865) and >1-month improvement in OS (10.7 vs 9.5 mo, HR: 0.890) vs sb-P/C (Table). nab-P/C was as effective as sb-P/C in nonsquamous pts for ORR (26% vs 25%, p = 0.808), PFS (6.9 vs 6.5 mo, HR: 0.933), and OS (13.1 vs 13.0 mo, HR: 0.950). In both squamous and nonsquamous pts, nab-P/C vs sb-P/C produced lower rates of grade 3/4 neuropathy (3% vs 11% and 3% vs 12%, respectively, p < 0.001 both), neutropenia (43% vs 51%, p = NS, and 50% vs 63%, p = 0.008), and higher but manageable rates of anemia (27% vs 4% and 28% vs 9%, p < 0.001 both) and thrombocytopenia (21% vs 7% and 16% vs 11%, p < 0.001 both). Conclusions: In pts with advanced NSCLC, nab-P/C demonstrated a favorable risk-benefit profile as a first-line therapy regardless of histology. Significantly improved ORR and a positive trend in OS were observed in pts with squamous histology. [Table: see text]