Fig 1From: Tumor-recruited M2 macrophages promote gastric and breast cancer metastasis via M2 macrophage-secreted CHI3L1 proteinTumor recruits M2 macrophages. a Immunohistochemical staining of HLA-DRα (an M1 macrophage marker) and CD206 (an M2 macrophage marker) in solid tumors from patients with gastric cancer. The tumor cells were stained with hematoxylin. The arrows indicate cancer cells, and the triangles indicate macrophages. Scalebar, 20 μm. b Numbers of M1 and M2 macrophages in tumor tissuesBack to article page