Table 4.
Dosimetric and volumetric parameters between groups according to left lung/heart volume ratio only in the mastectomy group (n = 58)
| Left lung/heart volume ratio | p* | ||
|---|---|---|---|
| ≤ 1.92 median (min–max) | > 1,92 median (min–max) | ||
| PTV volume (cc) | 661.3 (188.4–1239.0) | 454.0 (234.9–884.6) | 0.016 |
| PTV min (Gy) | 36.0 (13.6–50.4) | 36.0 (23.1–50.4) | 0.625 |
| PTV max (Gy) | 55.5 (51.5–63.7) | 56.2 (54.0–65.3) | 0.102 |
| PTV mean (Gy) | 51.1 (48.9–53.4) | 51.4 (50.0–57.2) | 0.045 |
| Left lung volume (cc) | 1055.3 (740.7–1365.2) | 1318.0 (1021.8–2241.0) | 0.000 |
| Lung min (Gy) | 0.3 (0.1–3.4) | 0.2 (0.1–2.4) | 0.024 |
| Lung max (Gy) | 53.2 (49.8–66.6) | 54.5 (5.6–58.1) | 0.001 |
| Lung mean (Gy) | 15.8 (8.5–51.1) | 14.8 (3.8–19.1) | 0.229 |
| Lung V5 (%) | 44.0 (22.0–65.2) | 40.0 (11.0–62.0) | 0.029 |
| Lung V10 (%) | 37.0 (9.0–50.2) | 33.0 (8.5–50.0) | 0.095 |
| Lung V20 (%) | 30.0 (7.0–42.8) | 28.0 (5.7–37.0) | 0.117 |
| Heart volume (cc) | 667.8 (499.6–848.1) | 576.0 (441.1–821.8) | 0.004 |
| Heart min (Gy) | 0.5 (0.2–40.0) | 0.3 (0.1–4.4) | 0.002 |
| Heart max (Gy) | 51.0 (5.5–54.6) | 52.1 (49.0–53.9) | 0.027 |
| Heart mean (Gy) | 7.1 (4.5–16.2) | 5.6 (2.5–8.3) | 0.002 |
| Heart V10 (%) | 16.5 (8.1–39.0) | 12.0 (6.0–20.0) | 0.012 |
| Heart V25 (%) | 10.5 (5.2–32.0) | 8.5 (3.5–17.0) | 0.020 |
| Heart V35 (%) | 8.05 (1.9–28.0) | 7.5 (2.4–15.0) | 0.118 |
PTV: Planning target volume, n: number of patient, Gy:Gray, cc:cubic cantimeter, max: maximum, min:minimum
* Kruskal–Wallis test
Bold values indicate the significant p values (p<0.05)