A study in 2016 investigated the expression of six selenoproteins (SELENOH, SELENOK, SELENOM, SELENOS, SELENOV, and GPx6) in a variety of tumor cell lines: HT 1080 (fibrosarcoma), HepG2 (hepatocellular carcinoma), MCF7 (breast adenocarcinoma), A-172 (glioblastoma), HeLa (cervical adenocarcinoma), and DU-145 (prostate carcinoma). This evidence concerns the gene GPX6 and neoplasm.