While CD99 and Bcl-2 are a common feature of SFTs, we used other markers to exclude relevant differential diagnoses, like CD31 (e.g., vascularized malignancies like spindled-cell angiosarcoma), Cytokeratin MNF116 (e.g., epithelioid sarcoma), or S100 (e.g., malignant peripheral nerve sheath tumor) (see Supplementary Table S2) [51]. Here, CD99 is linked to epithelioid sarcoma.