GBGT1 and ovarian carcinoma: Integrated analysis of GBGT1 DNA methylation and gene expression in the TCGA ovarian cancer data set showed that DNA methylation at cg18089000 was inversely correlated with GBGT1 expression in primary tumors, measured using either the Huex-1_0-st-V2 Affymetrix exon array (n = 583, rho = −0.27, P = 1.869e-11), or the Illumina HiSeq RNA-Seq platform (n = 265, rho = −0.42, P = 1.312e-12) (Additional file 1: Table S1).