The role of ALDH1 in differentiation of ovarian cancer stem cells and association of ALDH1 expression and various clinicopathologic factors including diagnosis, tumor grade, chemoresponses, staging of disease, and overall survival and disease-free survival of ovarian cancer was evaluated in recent research by Chang et al., using microarray analysis of ALDH1 (n = 442) by immune-histochemical staining as compared to the variations in clinical outcome. The gene discussed is ALDH1A1; the disease is ovarian cancer.