CD68 and neoplasm: In addition to TAMs, tumor cells also expressed CD68 (Fig. 2 a1, a2, a3; 2c1, c2, c3) and CD163 (Fig. 2 b1, b2, b3;2 d1, d2, d3) on the plasma membrane and in the cytoplasm as detected by the immunohistochemical staining.