ALDH1A1 and neoplasm: Similar to ALDH1 expression in the normal cervical tissues, the expression patterns of ALDH1 in the cervical cancer tissues could be classified into 3 types: (1) Dot-scattered ALDH1 expression (Figure 1Ae); (2) Focal distribution of ALDH1-positive tumor cells (Figure 1Af); and (3) Diffuse ALDH1 expression (Figure 1Ag).