Differential expression of lymphocyte antigen 6 complex, locus E in human epithelial ovarian cancer.
Epithelial ovarian cancer (EOC) is the most lethal gynecologic cancer (1). We performed discovery of genes associated with epithelial ovarian cancer and of the high-grade serous ovarian cancer (HGSC) subtype, using published microarray data (2, 3) to compare global gene expression profiles of normal ovary or fallopian tube with that of primary tumors from women diagnosed with epithelial ovarian cancer or HGSC. We identified the gene encoding lymphocyte antigen 6 complex, locus E, LY6E, as among the genes whose expression was most different in epithelial ovarian cancer as compared to the normal fallopian tube. LY6E expression was significantly higher in high-grade serous ovarian tumors relative to normal fallopian tube. LY6E expression correlated with progression-free survival in patients with ovarian cancer. These data indicate that expression of LY6E is perturbed in epithelial ovarian cancers broadly and in ovarian cancers of the HGSC subtype. LY6E may be relevant to pathways underlying ovarian cancer initiation (transformation) or progression.