Saygin C et al. - The international prognostic index (IPI) is the standard for prognostication of diffuse large B cell lymphoma (DLBCL) patients; however, the impact of co-morbidities in elderly patiens with DLBCL has not been established. In the current study it was shown that combining the IPI with the Charlson co-morbitidy index improves prognostication of elderly DLBCL patients.