Additionally, OTR gene expression in paired adjacent and tumour breast tissues was analysed from three datasets retrieved from the GEO database (Table 1), including GSE109169, containing 25 paired adjacent and tumour samples (no ER/PR/HER2 expression data available), GSE139038, containing 18 paired samples (including two TNBC tumour tissue with paired adjacent tissue), and GSE76250, containing 33 paired adjacent breast tissues and the corresponding TNBC tissues and 132 non-paired TNBC tumour tissues. Here, PGR is linked to neoplasm.