A dataset from 51 breast cancer cell lines revealed that OVOL1 mRNA levels were downregulated in cell lines classified into an aggressive basal subtype, compared with those cell lines grouped into a less aggressive luminal subtype (Supplementary Fig. 1a).37 However, no difference of OVOL2 and OVOL3 expression between these two subgroups was observed (Supplementary Fig. 1a). Here, OVOL1 is linked to breast cancer.