Purpose: The aim of this study was to assess the prognostic value of MIB-1 and p53 in the pediatric medulloblastoma group.
Materials And Method: Forty-two pediatric medulloblastoma cases diagnosed in a single institution during the past 10 years were evaluated. Follow-up data were available for 35 patients.
Results: The immunoreactivity of MIB-1 ranged from 10% to 95%; p53 immunoreactivity was found in five cases. Of the 35 patients with follow-up, 34 patients received a combination of chemotherapy and radiotherapy, while one received chemotherapy alone. The follow-up period ranged from 5 to 64 months. Of the 35 patients, 21 were alive without any evidence of recurrent disease, three were alive with evidence of recurrent disease and 11 died of disease during follow-up. The mean survival for these 11 patients was 21.9+/-10.4 months. Of the 35 cases, 16 had MIB-1 value of 25% or lower and 19 had a value of 26% or more. Of the 16 cases with low MIB-1 value, six died of disease; of the 19 cases with high MIB-1 value, five died of disease. The statistical difference between MIB-1 and prognosis was not significant. Three of the 35 (8.5%) cases were found to be positive with p53 protein; no correlation was observed between p53 immunoreactivity and prognosis.
Conclusion: It appears that the MIB-1 value and p53 immunoreactivity have no relation with prognosis in pediatric medulloblastomas. However, it is convenient to support these findings with large series.
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