S: 74%(14/19) of the tumors in American Caucasian showed somatic mtDNA mutation, while it was only 37%(24/54) in the Chinese Han people, and the latte r had more number of new mutation which was not recorded in the MitoMap database .

• 747%25(14/19)高加索人乳腺癌具有体细胞性线粒体基因突变,汉族人中乳腺癌体细胞性突变的发生率仅37%25(24/54),但后者未记录于MitoMap数据库的新突变数明显多于前者。