Table 3. Tumor formation of unsorted RCC-41-PDX-2, and sorted RCC-41-PDX-2/CD133⁺ and RCC-41-PDX-2/CD133⁻ cells in SCID mice as a function of number of injected cells (n = 4 per group).

	Number of injected cells per mouse (n = 4)	Number of mice with tumor (Delay 3 weeks)	Number of mice with tumor (Delay 6 weeks)	Number of mice with tumor (Delay 9 weeks)	Number of mice with tumor (Delay 10 weeks)
Unsorted RCC-41-PDX-2	102	3/4	4/4	-	-
	103	4/4	4/4	-	-
RCC-41-PDX-2/CD133+	102	0/4	0/4	0/4	0/4
	103	0/4	0/4	4/4	4/4
RCC-41-PDX-2/CD133−	102	2/4	2/4	2/4	4/4
	103	3/4	4/4	4/4	4/4