Figure 1

The cumulative incidences of grade ≥ 2 and ≥ 3 radiation pneumonitis (RP). The cumulative incidences of grade ≥ 2 RP were 32.7 and 39.3% at 6 and 12 months, respectively. The cumulative incidences of grade ≥ 3 RP were 9.6 and 14.3% at 6 and 12 months, respectively.