PRELIMINARY-STUDY OF TRACE-ELEMENTS IN HUMAN BRAIN-TUMOR TISSUES BY INSTRUMENTAL NEUTRON-ACTIVATION ANALYSIS

Elemental profiles of brain tumor tissues from 15 patients of astrocytomas (grade I-III) and normal human brain tissues of 23 male age matched autopsies as controls have been studied by instrumental neutron activation analysis. The SLOWPOKE reactor with a thermal neutron flux of 8 . 10(11) n . cm-2 . s-1 and swimming pool type reactor with a thermal neutron flux of 1 . 10(13) n . cm-2 . s-1 were used for short and long irradiation of samples, respectively. Spectrophotometry was only used for analyzing phosphorus. A total of 18 elements Se, Na, K, Br, Cl, Mn, Mg, S, Ca, Cu, Hg, Cr, Fe, Rb, Zn, Co, Sc and P has been determined for this purpose. The reliability of methods has been checked by analyzing biological standard reference materials horse kidney (IAEA H-8) and bovine liver (NBS SRM 1577a). The analytical results showed that compared with the normal brain tissues, concentrations of Ca, Fe, Cu, Zn, Se, Mn, Br and Sc were significantly higher in tumor tissues (P < 0.01) and concentrations of Rb, K and P were lower, while no differences for contents of Mg, S, Cr, Hg, Na and Cl were observed. A negative correlation between P and Ca in malignant and normal brain tissues was observed.