CD68 and sarcoma: In order to clarify the accumulation of TAMs and MDSCs in fibroblastic sarcomas, the desity of CD68 (a pan-macrophage marker), CD163 (a M2-polarized macrophage marker) and CD33 (a myeloid marker that sometimes is used for identification of MDSCs [23]) in 95 TMA cores of fibroblastic sarcomas were also evaluated by immunostaining.