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Methotrexate, formerly known as amethopterin, is a chemotherapy agent and immune-system suppressant. It is used to treat cancer, autoimmune diseases, and ectopic pregnancies. It is used for cancers such as breast cancer, leukemia, lung cancer, lymphoma, gestational trophoblastic disease, and osteosarcoma, as well as autoimmune diseases such as psoriasis, rheumatoid arthritis, and Crohn's disease. It can be given by mouth or by injection.
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