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.
Abramson Cancer Center of the University of Pennsylvania, Philadelphia, Pennsylvania, United States
University of Pennsylvania, Philadelphia, Pennsylvania, United States
University of California, San Francisco, San Francisco, California, United States
Northwestern University, Chicago, Illinois, United States
Sun Yat-sen University, Guangzhou, Guangdong, China
University Hospitals Cleveland Medical Center, Seidman Cancer Center, Case Comprehensive Cancer Center, Cleveland, Ohio, United States
Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois, United States
Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, United States
Riverside Methodist Hospital, Columbus, Ohio, United States
Grant Medical Center, Columbus, Ohio, United States
The Mark H Zangmeister Center, Columbus, Ohio, United States
Johns Hopkins All Children's Hospital, Saint Petersburg, Florida, United States
Institut Curie Hopital, Paris, France
Helen and Harry Gray Cancer Center at Hartford Hospital, Hartford, Connecticut, United States
Illinois CancerCare - Canton, Canton, Illinois, United States
Licking Memorial Cancer Care Program at Licking Memorial Hospital, Newark, Ohio, United States
Columbia University Medical Center, New York, New York, United States
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