Table 1.

In vivo tumorigenicity of different numbers of bladder cancer cells ^a

Cell type	No. of cells injected	Tumor incidence	Size of tumor (mm3)
ALDH1A1+	1 × 102	0/10
	1 × 103	8/10	19±1.2
	1 × 105	10/10	32±2.6
ALDH1A1−	1 × 102	0/10
	1 × 103	0/10
	1 × 105	1/10	5.5
ALDH1A1+/CD44+	1 × 102	0/10
	1 × 103	8/10	20±1.3
	1 × 105	10/10	33±2.3
ALDH1A1+/CD44−	1 × 102	0/10
	1 × 103	8/10	19±1.1
	1 × 105	10/10	31±2.6
ALDH1A1−/CD44+	1 × 102	0/10
	1 × 103	0/10
	1 × 105	4/10	13±0.9
CD44+	1 × 102	0/10
	1 × 103	3/10	11±0.5
	1 × 105	8/10	25±1.2
CD44−	1 × 102	0/10
	1 × 103	0/10
	1 × 105	2/10	5.4
ALDH1A1−/CD44−	1 × 102	0/10
	1 × 103	0/10
	1 × 105	1/10	5
Unsorted cells	1 × 102	0/10
	1 × 103	1/10	7
	1 × 105	3/10	10±0.6

^aThe table only shows results from HTB-2 cells.