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P1.01 - Poster Session/ Treatment of Advanced Diseases – NSCLC (ID 206)
- Event: WCLC 2015
- Type: Poster
- Track: Treatment of Advanced Diseases - NSCLC
- Presentations: 1
- Coordinates: 9/07/2015, 09:30 - 17:00, Exhibit Hall (Hall B+C)
P1.01-057 - Gemcitabine plus Platinum versus Other Platinum Doublets in Squamous NSCLC (ID 149)
09:30 - 17:00 | Author(s): H. Chi
Squamous cell carcinoma is the second most common histologic subtype of non-small-cell lung cancer (NSCLC). Platinum-based doublet chemotherapy regimens remain the basis of front-line systemic treatment. Most studies in NSCLC included all histologic subtypes. Here we present a pooled analysis of gemcitabine in combination with cisplatin or carboplatin, specifically focusing on patients with squamous NSCLC, from three studies for which individual patient data are available. The objective of this analysis was to evaluate the efficacy of first-line gemcitabine plus platinum (GP) compared with other regimens plus platinum (OP).
This analysis included squamous NSCLC patients from three randomized, open-label, phase III studies of gemcitabine: 1) gemcitabine plus cisplatin versus etoposide plus cisplatin (n=61), 2) gemcitabine plus carboplatin versus paclitaxel plus carboplatin (n=128), and 3) gemcitabine plus cisplatin versus pemetrexed plus cisplatin (n=473). Patients were grouped into the GP subgroup (n=324) or the OP subgroup (n=338). Efficacy measures included overall response rate (ORR), overall survival (OS), and time to disease progression (TTP). Stratified (by study) Cox proportional hazard regression models were used to analyze OS and TTP by random assignment factors to identify potential prognostic factors and explore their predictive value.
Baseline characteristics were similar between the GP and OP groups. Median OS was 9.72 months for GP versus 9.33 months for OP (HR=0.898, p=0.223) (Figure 1). There was a significant difference in median TTP (5.52 months for GP versus 4.73 months for OP; HR=0.792, p=0.008) (Figure 2). ORR was 31.5% for GP, and 27.2% for OP (p=0.229). Cox regression model identified three prognostic factors for OS: Eastern Cooperative Oncology Group performance status, prior radiotherapy, and body mass index. Figure 1. Kaplan–Meier estimates of overall survival Figure 1 Figure 2. Kaplan–Meier estimates of time to disease progressionFigure 2
This pooled analysis further confirmed the efficacy of gemcitabine plus platinum as first-line treatment of squamous NSCLC.