Some chemotherapy drugs used to treat cancer may increase the risk of second cancers later in life.
Drugs that suppress the immune system--used to treat some cancers as well as to prepare patients
receiving organ transplants--also are associated with increased risk of cancer, particularly
lymphoma.
On the other hand, new estrogen-blocking drugs called aromatase inhibitors can decrease the
recurrence of breast cancer.
Any medication carries risks and benefits, so always check with a health professional before
starting a new drug.
![Medications](https://webarchive.library.unt.edu/eot2008/20090510224705im_/http://www.cancer.gov/images/Documents/167a5f6c-1c75-4b8a-b1bc-c7520def8d6b/slide29.jpg)
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