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Brand name: Afinitor

Chemical name: Everolimus

Class: mTOR (mammalian target of rapamycin) inhibitor.

How it works: mTOR is a kinase, a type of protein in the body. Kinases help all cells -- both healthy and cancer cells -- get the energy they need. When kinases don’t act normally or are overactive, they help certain breast cancers grow. mTOR inhibitors work by interfering with the mTOR kinase.

Uses: Afinitor typically is used in combination with the aromatase inhibitor Aromasin to treat advanced-stage, hormone-receptor-positive, HER2-negative breast cancer in postmenopausal women that has already been treated with either Arimidex or Femara, two other aromatase inhibitors.

How it’s given: Afinitor is a pill taken by mouth. It is usually taken daily. Women keep taking Afinitor until they stop getting benefits from it.

Side effects:

Read more about Afinitor.

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