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.
St Anna Children's Hospital and CCRI/Studies and Statistics, Vienna, Austria
University Hospital Rigshospitalet, Copenhagen, Denmark
Ospedale Pediatrico Bambino Gseu, Rome, Italy
Massachusetts General Hospital, Boston, Massachusetts, United States
Dana Farber Cancer Institute, Boston, Massachusetts, United States
Huashan Hospital, Shanghai, Shanghai, China
Ronald Reagan UCLA Medical Center, Los Angeles, California, United States
Consorcio Hospitalario Provincial de Castellón, Castelló, Valencia, Spain
Hospital Universitari Germans Trias i Pujol/ICO Badalona, Badalona, Barcelona, Spain
Institut Català d'Oncologia L'Hospitalet, L'Hospitalet de Llobregat, Barcelona, Spain
Huashan Hospital Affiliated to Fudan University, Shanghai, Shanghai, China
Duke University Medical Center, Durham, North Carolina, United States
Kaiser Permanente Oakland-Broadway, Oakland, California, United States
Saint Joseph Hospital - Orange, Orange, California, United States
UC Irvine Health/Chao Family Comprehensive Cancer Center, Orange, California, United States
Sibley Memorial Hospital, Washington, District of Columbia, United States
The SKCCC at Johns Hopkins, Baltimore, Maryland, United States
Suburban Hospital, Bethesda, Maryland, United States
University of Nebraska Medical Center, Omaha, Nebraska, United States
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