Figure 4.

Tumorigenicity of ALDH1^high cells. (A) Representative tumor growth in NOD/SCID mice at the ALDH1^high cell injection site (5×10³ cells injected). ALDH1^high and ALDH1^low cells were inoculated subcutaneously into the left and right side of the back, respectively. (B) Histology images of ALDH1^high tumors in mice (stained by hematoxylin and eosin). (C) Tumor growth in NOD/SCID mice by ALDH1^high and ALDH1^low subpopulations of UTSCC-9 and UTSCC-90 cells (5×10³ cells injected). Data are reported as means ± SD.