GSTM1 and meningioma: The comparison of GSTM1-negative (GSTM1-) and GSTM1-positive (GSTM1+) transcriptomes revealed that GSTM1- meningiomas were characterized by higher expression of genes specific for positive regulation of cell motility, locomotion and angiogenesis, while transcriptomes of GSTM1+ tumors were enriched for transmembrane transport and system process genes.