IMMUNE STATUS OF PEDIATRIC BRAIN TUMOR PATIENTS AND THE EFFECT OF THERAPY

The cellular and humoral immunological parameters (leucocyte, granulocyte, lymphocyte, total T, T4, T8 lymphocyte counts, lymhpyo proliferative response to PHA (LP-PHA), natural killer cell activity (NKCA), IgG, IgM and IgA Levels) of 20 pediatric brain tumor patients were investigated before and after chemo-(CT) and radiotherapy (RT) administered according to the UIOI-PBT-91 protocol. The T4 and T8 cell percentages and the LP-PHA values before therapy were found to be significantly diminished in comparison to values obtained from 12 healthy children (p<0.05). Patients receiving postoperative CT, all cellular immunity parameters except T8 cell number and NKCA; IgG and IgA levels were significantly decreased after two courses of CT (p<0.05). In 7 patients given postoperative RT, a depression in all cellular immunity parameters was observed (p>0.05). In 6 patients treated with 2 courses of postoperative CT followed by RT administered concomitantly with low dose CDDP, there was a decrease in all cellular and humoral immunity parameters, which was not found to be significant. In 5/18 patients infectious episodes in mild to moderate severity were observed, none causing mortality. It was concluded that the UIOI-PBT-91 protocol caused cellular immunosuppression both after CT and after RT and some humoral immunosuppression after CT, but was found to be tole table in regard to acute immunological side effects.

Keywords: Brain tumors, immunity, chemotherapy, radiotherapy