Figure 7. The expression levels of ROM1. (A) ROM1 expression was markedly lower based on the merged datasets (GSE41883, GSE27494, GSE17077, and GSE147383). (B) ROC analysis of ROM1 in merged datasets. (C) ROM1 expression in the external validation set (GSE70362). (D) ROC analysis of ROM1 in the external validation set. (E) Immunohistochemical staining showing low levels in IVDD.