Progression-free survival (A) and overall survival (B) of 273 NHL patients according to the risk groups defined by TNF (−308) and LTα (+252) polymorphic haplotype status. The initial number of patients at risk for disease progression or death was 197 for the low-risk haplotype and 76 for the high-risk haplotype. The number of patients remaining at risk is shown below each time point. Pdenotes the log-rank test value.