NF1 and neurofibromatosis type 1: PFS for the NF1 group was 50 ± 15.8% at 5, 10 and 20 years while the non-NF1 group demonstrated a 5-year PFS of 53.8 ± 9.8% and 49.0 ± 10% at 10, 20 and 25-years (Figure 1C).