Fig. 1

ALDH1 expression in ovarian carcinoma cells and stromal cells. a A poor differentiated ovarian carcinoma showed negative immunostaining in tumor cells for ALDH1, while most of the stromal cells surrounding tumor cells were strongly positive (100×). b High magnitude was used in the same case in A, showing clear negative tumor cells and positive stromal cells (400×). c Variable expression levels of ALDH1 in tumor cells were displayed in a moderately differentiated ovarian carcinoma. The stromal cells were all positive (100×). d A part of figure (b) was enlarged, showing weakly positive staining in most of the tumor cells and the staining was limited to the membrane and the cytoplasm (400×). e Tumor cells in a well differentiated ovarian carcinoma were all strongly positive while the stromal cells were negative (100×). f High magnitude of a part of figure (E) displayed strongly positive staining for ALDH1 in most of the epithelial tumor cells/hyperplasia epithelial cells (400×)