Time to treatment failure of patients with advanced-stage FL treated with front-line R-CHOP. (A) Patients were grouped into 3 different risk groups as previously published (LR, 0 or 1 risk factor; IR, 2 factors; HR, 3-5 factors)⁷  or (B) analyzed separately according to the number of risk factors (RF) as indicated. The statistical significance between the 3 risk groups is shown.