LDHA and breast cancer: In the present study, we only show three cell lines with >30% ALDH+ cells (i.e., BT-474, DU4475, and CAL-148), which is in contrast to a study by Charafe-Jauffret et al. (Charafe-Jauffret et al., 2009) showing breast cancer cells with 5%–99% or 100% ALDH-positivity (e.g., HCC38 versus 5% in the current study) and 100% ALDH-positivity for BT-474 (36% in the current study) by Zhou et al. (Zhou et al., 2019).