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.
University of Pennsylvania Health System: Penn Medicine, Philadelphia, Pennsylvania, United States
Rutgers University - Cancer Institute of New Jersey, New Brunswick, New Jersey, United States
Baylor College of Medicine, Houston, Texas, United States
McGill University Health Centre-Cedars Cancer Centre, Montréal, Québec, Canada, Canada
Sidney Kimmel Cancer Center at Thomas Jefferson University, Philadelphia, Pennsylvania, United States
VU University Medical Center, Amsterdam, Noord-Holland, Netherlands
H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida, United States
Saint John's Cancer Institute, Santa Monica, California, United States
Universitatsklinikum Tubingen /ID# 169965, Tuebingen, Germany
Levine Cancer Ins, Carolina Me /ID# 171271, Charlotte, North Carolina, United States
Vrije Universiteit Medisch Centrum /ID# 170152, Amsterdam, Netherlands
Beijing Cancer Hospital, Beijing, China
The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
Guangdong Brain Hospital, Guangdong, China
Shenzhen People's Hospital, Shenzhen, China
Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori (IRST), Meldola, FC, Italy
Azienda Ospedaliera-Universitaria di Modena, Modena, MO, Italy
Ospedale Civile degli Infermi, Faenza, RA, Italy
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