Cumulative overall survival of Japanese patients with FAB-RA. The group with hemoglobin concentration of 70 to 100 g/L showed no significant prognostic difference from the group with hemoglobin greater than 100 g/L in patients with FAB-RA (P = .85). The group with hemoglobin concentrations of 70 to 100 g/L had a more favorable prognosis than did the group with hemoglobin concentrations lower than 70 g/L in patients with FAB-RA (P = .039).