Table 2. The tumor formation ability of sorted 769P side population (SP) and non-side population (NSP) cells in NOD/SCID mice.

Cell type	The number of mice inoculated with different amount of cells
	200 cells	2,000 cells	20,000 cells	200,000 cells
SP	2/9	9/9	9/9	N/A
NSP	N/A	0/9	7/8*	8/8*

N/A, not applied. All data are presented as the number of mice developed tumors/the number of mice underwent cell inoculation.

^*One mouse died after inoculation.