The tumor showed an undifferentiated phenotype, including negativity for cytokeratin, although it was immunoreactive to BCOR and MUC4, and was initially suspected as BCOR-associated sarcoma.
Genes that are upregulated in sarcoma include MUC4, CD24, FOXL1, ANGPTL2, HIF1α, MDK, cMET, TIMP-2, PRL, PCSK1, IGFR-1, TIE1, KDR, TEK, FLT1 and several microRNAs.