十多年前就取得了重大进展，一个加州的生物科技公司Genentech(中文名：基因泰克)发行了一种药物，这种药物攻击蛋白质HER2(中文名：人表皮生长因子受体- 2)含量过多的乳腺癌细胞。
A breakthrough came more than a decade ago when Genentech, a Californian biotech firm, launched a drug that attacks breast-cancer cells with too much of a certain protein, HER2.
事实上，加热的目标是那些会导致癌症生长和转移、以及对药物和化疗有抵抗力的乳腺癌干细胞。
The actual target was breast cancer stem cells, the cells from which cancers grow and metastasize, and which tend to resist drug and radiation treatments.
还有可能是激素能够维持一些乳腺癌细胞的生长，或者催生肿瘤生长和扩散需要的血管。
It is also possible that hormones may feed the growth of some breast cancers or the blood vessels that tumors need to grow and spread.
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