Figure 1. Overall Survival for Patients With Extended-Stage Small Cell Lung Cancer Receiving Cisplatin and Carboplatin by Cancer Stage, Eastern Cooperative Oncology Group (ECOG) Performance Status, and Age.

Graphs show overall survival for patients with cancer stage IV (A), by ECOG performance status (B-D), and by age group (E-G). The solid lines were estimated by a parametric Weibull proportional hazards regression analysis for interval censored data, and the dotted lines were generated by an interval-censored Cox proportional hazard model. HR indicates hazard ratio.