(A) OS for patients aged >80 years based on FLIPI risk group. Log-rank test for group difference, P = 0·0148.
(B) OS for patients aged >80 years based on the new prognostic index of B-symptoms, gender (male) and haemoglobin <120 g/l. Log-rank test for group difference, P < 0·0001.
(C) OS for patients aged >80 years in the validation cohort using the SEER-Medicare database. Log-rank test for group difference, P = 0·0072.
FLIPI, Follicular Lymphoma International Prognostic Index; OS, overall survival; SEER, Surveillance, Epidemiology and End Results