Glioma is the most common primary brain tumor that occurs
most frequently in adults, accounting for w70% of adult brain
malignancies [1,2]. Glioma has an incidence of 5 to 10 cases per
100 000 [1]. It has been suggested that genetic predisposition
and ionizing radiation are risk factors for brain tumors [3,4].
Additionally, other potential risk factors include exposure to
environmental chemical carcinogens, such as chemical agents
and, among dietary factors, exposure to N-nitroso compounds
[1,3]. N-nitroso compounds are broadly acting and potent carcinogens
in animal models [5]. Food items that usually include