For mRNAs that specifically differentiated between two or only one breast cancer subtype, miRNA expression was reported only in breast cancer subtype A, where predictive analysis showed that hsa-miR-34a potentially regulated HRH1 expression, and hsa-miR-3140-5p and hsa-miR-4251 potentially affected HRH2 expression. The gene discussed is HRH2; the disease is breast cancer.