P53 GENE-MUTATIONS IN BRAIN-TUMORS IN TAIWAN

Mutations of the p53 gene were investigated in 116 surgically removed primary brain tumor tissues by PCR-SSCP analysis. The mutations did no t follow a random distribution among the various different subtypes, b ut occurred in 21.0% (13/62) of astrocytomas, 13.0% (3/23) of oligoden drogliomas and 35% (7/20) of PNETs. No mutation was found in the epend ymomas. The majority of mutations identified in this study were G:C to A:T or C:G to T:A transitions (56.0%, 14 of 25) and occurred most fre quently (56.0%, 14 of 25) at sites of CpG dinucleotides. Interestingly , codon 158 is a new hot spot which occurred with a frequency of 16.0% (4 of 25) in the samples analyzed.