Objective: To study the expression of the tumor suppressor gene RASSF1A in breast cancer, and the correlation between the expression and the promoter hypermethylation of RASSF1A.

• 摘要目的：研究抑癌基因RASSF1A在乳癌组织中的表达情况及与RASSF1A基因启动子甲基化的关系。