The mean length of the polyglutamine chain in exon 1 of AR in male GBM patients was 21.4 (±2.7), and among control males 21.9 (±2.8), whereas for the female patients it was 20.1 (±2.2) for the shorter allele and 23.4 (±2.6) for the longer allele, and in female controls 20.4 (±2.3) and 23.6 (±2.4), respectively. This evidence concerns the gene AR and glioblastoma.