Analysis of the Genomic Data Commons (GDC) the Cancer Genome Atlas (TCGA) Breast Cancer database indicated a positive correlation between PRKCQ-AS1 and MKP1 in 1,217 breast cancer samples (correlation coefficient = 0.2) (Fig. S6A), and a stronger correlation in 468 ER+/ human epidermal growth factor receptor2 (HER2)- breast cancer samples (correlation coefficient = 0.36) (Fig. 3B). Here, ESR1 is linked to breast carcinoma.