Refractory anaplastic astrocytoma (WHO grade III) and Glioblastoma multiforme (WHO grade IV) are primary malignant brain tumours with poor prognosis and limited treatment options. Despite considerable genetic heterogeneity, these tumours often have impaired DNA repair systems, rendering them initially sensitive to alkylating agents, although they invariably develop resistance to these agents over time. Temozolomide is an imidazotetrazine prodrug that is stable at acidic pH but undergoes spontaneous nonenzymatic hydrolysis at neutral or slightly basic pH; these properties allow for both oral and intravenous administration. Following initial hydrolysis, further reactions liberate a highly reactive methyl diazonium cation capable of methylating various residues on adenosine and guanine bases leading to DNA lesions and eventual apoptosis. Temozomolide as an adjunct to radiotherapy followed by maintenance dosing remains the standard of care for both Glioblastoma and refractory anaplastic astrocytoma.
Temozolomide was granted FDA approval on August 11, 1999, as an oral capsule and subsequently on February 27, 2009, as an intravenous injection. It is currently marketed under the trademark TEMODAR® by Merck.
Temozolomide is indicated in adult patients for the treatment of newly diagnosed glioblastoma concomitantly with radiotherapy and for use as maintenance treatment thereafter. It is also indicated for the treatment of refractory anaplastic astrocytoma in adult patients or adjuvant therapy for adults with newly diagnosed anaplastic astrocytoma.
Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, United States
University of Wisconsin Comprehensive Cancer Center, Madison, Wisconsin, United States
Winship Cancer Institute of Emory University, Atlanta, Georgia, United States
Josephine Ford Cancer Center at Henry Ford Hospital, Detroit, Michigan, United States
University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States
University of Kentucky Hospital, Lexington, Kentucky, United States
University of Chicago Medical Center, Chicago, Illinois, United States
FLENI, Ciudad Autónoma de Buenos Aires, Argentina
NJ Neuroscience Institute; JFK Medical Center, Edison, New Jersey, United States
University of Rochester Medical Center, Rochester, New York, United States
Massachusetts General Hospital, Boston, Massachusetts, United States
Universitätskinderklinik Freiburg, Freiburg, Germany
Universitätskinderklinik Göttingen, Göttingen, Germany
Universitätskinderklinik Heidelberg, Heidelberg, Germany
Memorial Sloan-Kettering Cancer Center, New York, New York, United States
Memoral Sloan Kettering Cancer Center, Basking Ridge, New Jersey, United States
Memorial Sloan-Kettering Cancer Center at Commack, Commack, New York, United States
University of Texas MD Anderson Cancer Center, Houston, Texas, United States
Cancer Center of Kansas-Independence, Independence, Kansas, United States
Munson Medical Center, Traverse City, Michigan, United States
Garneau, Stewart C MD (UIA Investigator), Moline, Illinois, United States
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