Kaplan-Meier curves. OS for primary NL vs secondary NL: median OS, 138.0 months; 95% CI, 55.0 months-NR vs median OS, 25.4 months; 95% CI, 9.5-118.2 (left panel). OS for NL associated with indolent vs aggressive lymphoma type: median OS, NR; 95% CI, 55.0 months-NR vs median OS, 46.9 months; 95% CI, 12.5-138.0 (right panel).