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Table 2 Dose-volume parameters according to treatment (N = 30)

From: Preliminary result of definitive radiotherapy in patients with non-small cell lung cancer who have underlying idiopathic pulmonary fibrosis: comparison between X-ray and proton therapy

Characteristics X-ray (n = 22) Proton (n = 8) p value
Clinical target volume (cm3) 73.3 ± 52.6 206.1 ± 100.6 0.007
Total lung
 Mean dose (cGy or CcGE) 809.8 ± 368.1 796.9 ± 475.2 0.938
 V5 (%) 28.4 ± 9.7 23.1 ± 11.6 0.216
 V10 (%) 19.8 ± 8.8 18.7 ± 10.5 0.782
 V20 (%) 13.1 ± 8.1 14.3 ± 8.6 0.717
Heart
 V45 (%) 0.2 ± 0.5 0.1 ± 0.2 0.855
Esophagus
 Maximum dose (cGy or CcGE) 1588.5 ± 1030.2 1261.4 ± 1216.3 0.469
 Mean dose (cGy or CcGE) 408.0 ± 301.4 257.9 ± 304.6 0.239
Spinal cord
 Maximum dose (cGy or CcGE) 1141.4 ± 761.5 1487.0 ± 1491.0 0.548
  1. VD percentage volume of organ receiving ≥ D Gy
  2. Data are presented as mean ± SD