Gefitinib is a drug that is used to treat several types of lung cancer. It works by preventing lung cancer cells from growing and multiplying. Many cells, pregabalin including cancer cells, have receptors on their surfaces for epidermal growth factor (EGF), a protein that is xifaxan normally produced by the body campral and that promotes the growth and multiplication of cells. When temozolomide EGF attaches to epidermal growth factor receptors (EGFRs), it causes an enzyme called tyrosine androgel kinase to become active within the cells. Tyrosine kinase triggers chemical processes that cause the cells, including cancer cells, to grow, multiply, and spread. Gefitinib attaches to EGFRs and thereby blocks the attachment of EGF and the activation of tyrosine kinase. This mechanism for stopping cancer cells from growing and multiplying is very different from the mechanisms of chemotherapy and hormonal tramadol therapy. Gefitinib was approved by the FDA in May 2003.

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