PFS of the RT and CMT cohorts by stage. Kaplan-Meier curves demonstrate the PFS of patients with stages I and II NLPHL receiving RT (A) or CMT (B). Five-year PFS for patients receiving RT was 89.8% (95% CI, 82.8%-94.0%) for stage I and 93.9% (95% CI, 84.4%-97.7%) for stage II. Five-year PFS for patients receiving CMT was 95.3% (95% CI, 86.0%-98.5%) for stage I and 87.9% (95% CI, 79.1%-93.1%) for stage II.