Table 3 Comparison of dosimetry parameters of lung and heart between bolus group and no bolus group in left breast cancer and right breast cancer
Characteristics (Left breast cancer) | Before PSM | P value | After PSM | P value | ||
|---|---|---|---|---|---|---|
No-bolus (N = 150) | Bolus (N = 132) | No-bolus (N = 97) | Bolus (N = 91) | |||
Dmean of ipsilateral lung, median (IQR) | 1525.2 (1427.1, 1697.9) | 1463.2 (1357.2, 1542.6) | < 0.001* | 1569.9 (1435.8, 1726.6) | 1466.9 (1369.5, 1544) | < 0.001* |
V20% of ipsilateral lung, median (IQR) | 24.5 (21.618, 26.995) | 22.85 (20.9, 24.625) | < 0.001* | 24.6 (21.69, 27.2) | 22.9 (20.995, 24.65) | 0.002* |
V30% of ipsilateral lung, median (IQR) | 16 (14.33, 18) | 15.15 (13.2, 16.5) | 0.001* | 16 (14.7, 18.23) | 15.1 (13.495, 16.52) | 0.005* |
Dmean of heart, mean ± sd | 1203.2 ± 360.39 | 1090.1 ± 300.83 | 0.004* | 1250.1 ± 357.41 | 1126.1 ± 285.41 | 0.010* |
V30% of heart, median (IQR) | 6.16 (3.48, 9.075) | 5.45 (3.7825, 8.05) | 0.213 | 6.5 (3.6, 9.47) | 5.95 (4.2, 8.3) | 0.432 |
Characteristics (Right breast cancer) | Before PSM | P value | After PSM | P value | ||
|---|---|---|---|---|---|---|
No-bolus (N = 125) | Bolus (N = 122) | No-bolus (N = 78) | Bolus (N = 84) | |||
Dmean of ipsilateral lung, median (IQR) | 1500.1 (1436, 1657.7) | 1479.2 (1371.9, 1604.6) | 0.022* | 1530.8 (1450.4, 1672.6) | 1481.3 (1375.2, 1614.2) | 0.030* |
V20% of ipsilateral lung, median (IQR) | 23.6 (21.6, 26.49) | 23.7 (22, 25.875) | 0.994 | 23.7 (21.45, 27.45) | 23.7 (22, 25.575) | 0.632 |
V30% of ipsilateral lung, median (IQR) | 15.5 (14, 17.9) | 15.2 (13.617, 17.1) | 0.251 | 15.45 (14.025, 17.788) | 14.8 (13.4, 17.025) | 0.193 |
Dmean of heart, median (IQR) | 536.4 (423.6, 649.1) | 508.35 (397.07, 619.52) | 0.130 | 544.25 (450.55, 664.93) | 518.15 (390.8, 625.07) | 0.067 |