ESR1 and breast cancer: As shown in Figure 5A, high expression of hsa-let-7a-5p, hsa-let-7c-5p, hsa-miR-26a-5p, hsa-miR-30a-5p, hsa-miR-29c-3p, hsa-miR-10b-5p, hsa-miR-195-5p, and hsa-miR-497-5p indicated favorable prognosis whereas high expression of hsa-let-7e-5p, hsa-miR-302b-3p, hsa-miR-302d-3p, hsa-miR-193b-3p, hsa-miR-34a-5p, and hsa-miR-145-5p showed unfavorable prognosis in TCGA ERα positive breast cancer.