ALDH1A3 and neoplasm: We also noted that ALDH1A3 upregulated TIMP metallopeptidase inhibitor 3 (TIMP3) in MDA‐MB‐231 cells (Fig. 1B), and TIMP3 was highly co‐expressed with ALDH1A3 in the TCGA Cell 2015 patient tumour dataset (Fig. 1A).