In cell lines, the high level of CD99 at the transcriptional RNA level was observed in sarcoma (i.e., ASC diff, NX-value: 124.2), foreskin fibroblasts (i.e., BJ hTERT, NX-value:100.3), and malignant glioma (i.e., U138 MG, NX-value: 49.6) cells. Here, CD99 is linked to sarcoma.