Objective To explore the expression of miRNA(miR)-429 and the role of its promoter methylation in breast cancer. Methods The surgical specimens from 50 patients with invasive breast cancer were collected.The expression of miR-429 in cancerous and para-cancerous tissues was measured by quantitative real-time PCR,and the methylation status of the CpG islands around the promoter region of miR-429 was investigated by methylation-specific PCR.The relationship between the methylation status of the promoter region...