ERVFRD-1 and cancer: Based on the pan-cancer analysis, ERVFRD-1 expression was generally low in various types of cancers such as BLCA, BRCA, CESC, CHOL, COAD, ESCA, KIRC, KIRP, LGG, LIHC, LUSC, PCPG, PRAD, READ, STAD, THCA, UCEC, and UCS (Figure 1A).