Trend in DLCO(Hb) and FVC during the treatment program. (A) Mean DLCO(Hb) at baseline, pre-ISRT, post-ISRT, and 12 months posttreatment are 91% (n = 30), 82% (n = 29), 92% (n = 23), and 98% (n = 15), respectively. (B) Trend in FVC during treatment program. Mean FVC at baseline, pre-ISRT, post-ISRT, and 12 months posttreatment are 91% (n = 30), 97% (n = 28), 99% (n = 22), and 106% (n = 15), respectively.