<p><strong>Neoplastic Diseases</strong>: Methotrexate is indicated in the treatment of gestational choriocarcinoma, chorioadenoma destruens and&nbsp;hydatidiform mole. Methotrexate is used in&nbsp;maintenance therapy&nbsp;in combination with other chemotherapeutic agents. Methotrexate is used alone or in combination with other anticancer agents in the treatment of breast&nbsp; cancer, epidermoid cancers of the head and neck, advanced&nbsp;mycosis fungoides&nbsp;(cutaneous&nbsp;T cell&nbsp;lymphoma), and lung cancer, particularly squamous cell and small cell types. Methotrexate is also used in combination with other chemotherapeutic agents in the treatment of advanced stage non-Hodgkin&#39;s lymphomas.<br />
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<strong>Psoriasis</strong>: Methotrexate is indicated in the symptomatic control of severe, recalcitrant, disabling psoriasis&nbsp;that is not adequately responsive to other forms of therapy,&nbsp;but only when the diagnosis has been established, as&nbsp;by biopsy and/or after dermatologic consultation.&nbsp;It is important to ensure that a psoriasis &ldquo;flare&rdquo; is not due to an undiagnosed concomitant disease affecting immune responses.<br />
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<strong>Rheumatoid Arthritis Including Polyarticular-Course Juvenile Rheumatoid Arthritis:&nbsp;</strong>Methotrexate is indicated in the management of selected adults with severe, active,&nbsp;rheumatoid arthritis&nbsp;(ACR criteria), or children with active polyarticular course juvenile rheumatoid arthritis, who have had an insufficient therapeutic response to, or are intolerant of, an adequate trial of first-line therapy including full dose non-steroidal anti-inflammatory agents (NSAIDs).<br />
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Aspirin, NSAIDs, and/or low dose steroids may be continued, although the possibility of increased toxicity with concomitant use of NSAIDs including salicylates has not been fully explored. Steroids may be reduced gradually in patients who respond to methotrexate. Combined use of methotrexate with gold, penicillamine, hydroxychloroquine, sulfasalazine, or&nbsp;cytotoxic&nbsp;agents, has not been studied and may increase the incidence of adverse effects. Rest and physiotherapy as indicated should be continued.</p>