CD68 and neoplasm: In tumor tissue and stroma of subgroups E2 and E3, a total of 138.11±5.57 and 136.86±4.05 CD68-positive cells were detected (Fig. 1s, 1t, 2s, 2t and 6); this number was 85.6±5.22 and 98.7 ± 6.09 positive cells for subgroups C2 and C3, respectively (Figs. 3s, 3t, 4s, 4t and 6).