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.
Samuel Oschin Comprehensive Cancer Institute at Cedars-Sinai Medical Center, Los Angeles, California, United States
Dana-Farber/Harvard Cancer Center at Dana Farber Cancer Institute, Boston, Massachusetts, United States
University of Illinois Medical Center, Chicago, Illinois, United States
Addenbrooke's NHS Trust, Cambridge, England, United Kingdom
Royal Marsden NHS Trust, London, England, United Kingdom
UniversitaetsSpital, Zurich, Switzerland
Duke Comprehensive Cancer Center, Durham, North Carolina, United States
Memorial Sloan-Kettering Cancer Center, New York, New York, United States
Warren Grant Magnuson Clinical Center - NCI Clinical Studies Support, Bethesda, Maryland, United States
Dana-Farber/Harvard Cancer Center at Dana Farber Cancer Institute, Boston, Massachusetts, United States
NYU School of Medicine's Kaplan Comprehensive Cancer Center, New York, New York, United States
Medical Research Council Clinical Trials Unit, London, England, United Kingdom
Yale Comprehensive Cancer Center at Yale University School of Medicine, New Haven, Connecticut, United States
Robert H. Lurie Comprehensive Cancer Center at Northwestern University, Chicago, Illinois, United States
University of Chicago Cancer Research Center, Chicago, Illinois, United States
MBCCOP - Gulf Coast, Mobile, Alabama, United States
CCOP - Beaumont, Royal Oak, Michigan, United States
Veterans Affairs Medical Center - West Los Angeles, Los Angeles, California, United States
Duke Comprehensive Cancer Center, Durham, North Carolina, United States
Duke Comprehensive Cancer Center, Durham, North Carolina, United States
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