Pemetrexed chemical structure
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Alimta

Pemetrexed (brand name Alimta) is a chemotherapy drug. Its indications are the treatment of pleural mesothelioma as well as non-small cell lung cancer. more...

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Mechanism of action

Pemetrexed is chemically similar to folic acid and is in the class of chemotherapy drugs called folate antimetabolites. It works by inhibiting three enzymes used in purine and pyrimidine synthesis—thymidylate synthase (TS), dihydrofolate reductase (DHFR), and glycinamide ribonucleotide formyl transferase (GARFT). By inhibiting the formation of precursor purine and pyrimidine nucleotides, pemetrexed prevents the formation of DNA and RNA, which are required for the growth and survival of both normal cells and cancer cells.

The molecular structure of pemetrexed was developed by Edward C. Taylor at Princeton University and clinically developed by Indianapolis based drug maker, Eli Lilly and Company.

Clinical use

In February 2004, the Food and Drug Administration approved pemetrexed for treatment of malignant pleural mesothelioma, a type of tumor of the lining of the lung, in combination with cisplatin. In July 2004, the FDA granted approval as a second-line agent for the treatment of non-small cell lung cancer.

Patients are required to be on folic acid and vitamin B12 supplementation when they are on pemetrexed therapy. (In clinical trials for mesothelioma, folic acid and B12 supplementation reduced the frequency of adverse events.)

Read more at Wikipedia.org


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First drug for rare cancer - Updates - Alimta - Brief Article
From FDA Consumer, 5/1/04

Cancer of the mesothelium--a membrane that covers and protects most of the body's internal organs--is usually associated with a history of asbestos exposure and affects the lining of the chest. About 2,000 new cases are diagnosed each year. By the time symptoms appear, the disease is often advanced, with people living nine to 13 months on average after diagnosis.

In February 2004, the FDA approved Alimta (pemetrexed), the first drug for a rare type of cancer called malignant pleural mesothelioma.

Alimta works by blocking enzymes thought to play a role in the rapid growth of lung tumors. The drug received a priority review and was approved for use with another cancer treatment called cisplatin. In a clinical trial, people receiving Alimta and cisplatin lived three months longer than those given cisplatin alone (12 months versus nine months). Alimta must be given with vitamin B-12 and folio acid to lower the chance and the severity of side effects.

The most common side effects are low white blood count, nausea, vomiting, fatigue, rash, and diarrhea. Alimta will be distributed by Eli Lilly and Company of Indianapolis.

COPYRIGHT 2004 U.S. Government Printing Office
COPYRIGHT 2004 Gale Group

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