which binds to estrogen receptors

能够与雌激素受体结合
and blocks estrogen signaling.

阻断雌激素信号通路
Many types of cancers, particularly breast cancers,

许多种癌症尤其是乳腺癌
many breast cancers but not all,

很多乳腺癌但不是所有的
are sensitive to estrogen.

对雌激素十分敏感
Estrogen is a natural signal for cells to grow.

雌激素是一类细胞生长信号
It's a natural signal for cells to grow.

它能够促进细胞生长
and if you design a drug that blocks estrogen interaction

如果能够设计一种药物阻断雌激素的作用
you stop growth.

就能阻止细胞生长
Stopping growth in tumors can be a very beneficial thing.

阻断肿瘤的生长是一件十分有益的事
There's a whole class of antagonistic drugs

现有一大类的拮抗剂类药物
that have been designed to influence your cardiovascular system.

全部是设计作用于心血管系统的