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.
Start Midwest, Grand Rapids, Michigan, United States
Washington University in St Louis, Saint Louis, Missouri, United States
Montefiore Medical Park At Eastchester Einstein Campus, Bronx, New York, United States
Dana Farber Cancer Institute, Boston, Massachusetts, United States
Massachusetts general Hospital, Boston, Massachusetts, United States
University of California, San Francisco, San Francisco, California, United States
UCSF Benioff Children's Hospital, Oakland, Oakland, California, United States
Dana-Farber Cancer Institute, Boston, Massachusetts, United States
Emory University/Winship Cancer Institute, Atlanta, Georgia, United States
University of Miami Miller School of Medicine-Sylvester Cancer Center, Miami, Florida, United States
Johns Hopkins University/Sidney Kimmel Cancer Center, Baltimore, Maryland, United States
University of Cincinnati, Cincinnati, Ohio, United States
Rhode Island Hospital, Providence, Rhode Island, United States
National Institutes of Health Clinical Center, Bethesda, Maryland, United States
University of Chicago Medical Center, Chicago, Illinois, United States
Taipei Veterans General Hospital, Taipei City, Taiwan
Tri-Service General Hospital, Taipei City, Taiwan
University of Alabama at Birmingham, Birmingham, Alabama, United States
Massachusetts General Hospital, Boston, Massachusetts, United States
Dana Farber Cancer Institute, Boston, Massachusetts, United States
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