Table 3.
Mean percent volume of OAR receiving various dose levels for N0–N1 patients (upper limit of fields at S2–S3) for a 59.4 Gy treatment
| Mean volume receiving above threshold dose (%) † | |||||
| Organ | Threshold dose (Gy) | A | B | C | D |
| Bladder | 30 | 100 | 87.8* (80–95) | 86.7* (78–92) | 80.8* (74–83) |
| 40 | 100 | 65.2* (55–76) | 57.4* (43–69) | 46.2* (35–55) | |
| Genitalia/perineum | 30 | 85.8 (72–99) | 47.6* (23–88) | 36.4* (23–52) | 26.6* (13–44) |
| 40 | 80.4 (65–98) | 20.2* (0–54) | 7.2* (0.2–18) | 2.7* (0–7) | |
| Small bowel | 30 | 59.3 (37–72) | 40.1* (28–49) | 39.6* (28–48) | 39.7 (29–45) |
| 40 | 56.1 (35–68) | 25.0* (17–31) | 24.5* (16–30) | 26.7* (19–30) | |
| Iliac crests | 10 | 39.8 (33–52) | 37.4 (33–44) | 37.1 (33–44) | 39.6 (35–47) |
| 20 | 33.7 (28–47) | 28.4 (26–30) | 28.2 (26–30) | 28.3 (27–30) | |
| Femoral heads | 45 | 33.8 (25–51) | 23.3 (8–45) | 14.6* (2–30) | 20.9* (12–30) |
†Mean in % (range).
* denotes statistically significant p values (p < 0.05) as compared with arm A.