Table 2: Difference of tumorigenic ability between ABCG2+ and ABCG2− cells.

Cell phenotypeCell number Number of tumors established/total number of mice inoculated 
(maximum diameter of tumors (cm))
1 week2 weeks4 weeks8 weeks

ABCG2+ 4/4 (0.4–0.6)4/4 (0.8–1.2)3/3 (1.6–2.0)2/2 (1.7–2.1)
4/4 (0.3–0.5)4/4 (0.7–1.0)4/4 (1.2–1.9)4/4 (0.7–2.0)
4/4 (0.1–0.3)4/4 (0.5–0.9)4/4 (1.0–1.4)4/4 (1.2–1.5)
1/4 (0.2)4/4 (0.5–0.8)4/4 (0.9–1.3)3/3 (1.0–2.2)
0/42/4 (0.2–0.5)4/4 (0.5–1.0)4/4 (0.6–1.6)

ABCG2− 4/4 (0.2–0.4)4/4 (0.8–1.1)4/4 (1.2–1.9)2/2 (1.3–1.8)
4/4 (0.2-0.3)4/4 (0.7–1.0)4/4 (1.2–1.8)3/3 (1.3–2.0)
0/43/4 (0.4–0.6)4/4 (0.6–1.3)4/4 (0.6–2.5)
0/40/40/41/4 (0.8)
0/40/40/40/4