Table 4.

Mean percent volume of OAR receiving various dose levels for N2-3 and/or T4 patients (upper limit of fields at L5-S1) for a 59.4 Gy treatment

		Mean volume receiving above threshold dose (%)†
Organ	Threshold dose (Gy)	A	B	C	D
Bladder	30	100	88.6* (76–100)	84.9* (71–99)	77.0* (68–84)
	40	100	60.2* (43–74)	52.5* (39–70)	39.0* (30–54)
Genitalia/perineum	30	87.0 (60–100)	64.4 (26–93)	46.2* (26–68)	32.8* (20–53)
	40	85.1 (56–99)	25.9* (2–43)	9.8* (1–26)	7.4* (0–26)
Small bowel	30	64.4 (48–89)	43.6* (38–52)	43.0* (37–50)	45.8 (39–55)
	40	62.1 (45–87)	26.5* (21–30)	25.8* (19–30)	28.3* (20–35)
Iliac crests	10	59.9 (57–63)	52.2* (45–57)	51.4* (45–56)	56.0 (47–60)
	20	50.2 (47–54)	33.0* (30–37)	32.8* (30–37)	34.3* (30–38)
Femoral heads	45	29.9 (21–39)	15.7* (8–21)	8.8* (6–14)	14.6* (11–17)

†Mean in % (range).

* denotes statistically significant p values (p < 0.05) as compared with arm A.