Using the one available GEO dataset containing normal reference tissue (astrocytes; GSE15824), we found that ABCG1 expression was increased in glioblastoma tumors (697 ± 554, 230913_at probe set; 428 ± 305, 232081_at probe set) relative to astrocytes (11.5 ± 1.1, 230913_at probe set; 13.9 ± 8.1, 232081_at probe set). This evidence concerns the gene ABCG1 and glioblastoma.