We identified 10 DEGs (CACNA2D1, CDK2AP1, GALNT5, GNAS, HOXA9, MAST2, PLXNA4, POU6F1, SALL1, SMAD9) whose normalized expression levels in all fibrosarcoma samples was at least two-fold greater than that in all samples for both other tumor types. The gene discussed is MAST2; the disease is fibrosarcoma.