PON1 and meningioma: We tested also the frequencies for haplotypes and the P values for overall patients, astrocytoma patients and meningioma patients, respectively, were as follows: PON1 55L+192Q, 0.648, 0.945 and 0.384; PON1 55L+192R, 0.568, 0.721 and 0.557; PON1 55M+192Q, 0.560, 0.472 and 0.936; PON1 55M+192R, 0.291, 0.515 and 0.318.