MiRNA, lncRNA, circRNA, and piRNA are associated with proliferation, apoptosis, metastasis, autophagy, stemness, and drug resistance in BC. Dysregulation of ncRNAs due to aberrant crosstalk between methylation modification and ncRNAs is associated with malignant behavior in BC, such as proliferation (miR-375, lncRNA EPIC1, circBACH2. miR-200a-5p, miR-125b, miR-10b, miR-29b-1-5p), apoptosis (lncRNA APOC1P1-3, LNC942. lncRNA PYCARD-AS1), metastasis (miR-146a-5p, miR-29a, lncRNA HUMT, lncRNA MYMA, LINC00518, and lncRNA HOTAIR. miR-200c/141, miR-205, miR-124, and LINC00472), autophagy (miR-125a), stemness (piR-823, miR-34c, miR-200c-141, and miR-203), and drug resistance (miR-663, miR-221-3p, lncRNA H19, lncRNA UCA1. miR-375, miR-27b, miR-320a, miR-149, miR-375, lncRNA GAS5, lncRNA MEG3, lncRNA SNHG10).