Eli5 – Why do some cancer medications cause cancer?

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I take a medication (Methotrexate) to treat rheumatoid arthritis. The drug is also used to treat cancer in higher doses. Certain types of cancers are a potential side effect. How does a medication used to treat cancer also potentially cause it?

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Anonymous 0 Comments

Because it just so happened what someone testing it developed a different kind of cancer. So they have to include it in the side effects whether it was actually caused by the specific medication or not. Some of the medications with “death” listed as a side effect are from people dying of auto accidents during trials. Anything that happens during a trial has to be included whether it can be proven or not.

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