Overall survival and PFS curves of patients with intermediate- and high-grade non-Hodgkin’s lymphoma. (A and C) Overall survival of patients in the low and low-intermediate (L + L-I) risk and high-intermediate and high (H-I + H) risk groups based on the IPI, respectively. (B and D) PFS of patients in the L + L-I and H-I + H risk groups based on the IPI, respectively.