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.
Mercy Health - Perrysburg Hospital, Perrysburg, Ohio, United States
University of Alabama at Birmingham Cancer Center, Birmingham, Alabama, United States
Katmai Oncology Group, Anchorage, Alaska, United States
Children's Healthcare of Atlanta - Egleston, Atlanta, Georgia, United States
UCSF Medical Center-Mission Bay, San Francisco, California, United States
Children's Hospital Colorado, Aurora, Colorado, United States
Tampa General Hospital, Tampa, Florida, United States
Barrow Neurological Institute at St. Joseph's Hospital and Medical Center, Phoenix, Arizona, United States
Arizona Cancer Center at University of Arizona Health Sciences Center, Tucson, Arizona, United States
University of Arizona Cancer Center, Tucson, Arizona, United States
Augusta University, Augusta, Georgia, United States
University Cancer and Blood Center, Athens, Georgia, United States
UC Irvine Chao Family Comprehensive Cancer Center, Orange, California, United States
Jonsson Comprehensive Cancer Center, Los Angeles, California, United States
Barrow Neurological Institute at St. Joseph's Hospital and Medical Center, Phoenix, Arizona, United States
Children's Hospital of Los Angeles, Los Angeles, California, United States
Seattle's Children Cancer Center, Seattle, Washington, United States
University College London Hospital, London, United Kingdom
King Fahad Medical City, Riyadh, Saudi Arabia
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