Semilog plots of overall survival and time-to-relapse (TTR) for a population of 323 patients with resected NSCLC, with exponential decay nonlinear regression analysis. For TTR, patients who had developed no evidence of relapse were censored at time of last follow-up, at death from other causes or at development of a non-localized second primary. Overall survival was uniphasic, with a half-life of 74.3 months, while relapse-free survival was triphasic, with a rapidly-relapsing population (7.4% of the original population, half-line=5.9 months, a slowly-relapsing population (31.9% of the original population, half-life=23.6 months), and an apparently cured population (60.7% of the original population).