Abstract
Background: M2 macrophages and regulatory T cells (Tregs) can promote tumors and development by inhibiting the anti-tumor immune response. This study investigated the number of CD163‐positive M2 macrophages and Foxp3-positive Tregs in the progression of colorectal cancer. It also investigated the correlation and of M2 macrophages and Tregs.Methods: Postoperative tissue specimens and clinical data were collected from 197 patients with colorectal cancer who underwent initial surgical treatment in The Second Ward of Colorectal Surgery of the First Affiliated Hospital of Jinzhou Medical University from March 2020 to December 2020. Use immunohistochemical methods to detect the expression levels of CD163 protein-labeled M2 macrophages and Foxp3 protein-labeled Tregs in colorectal cancer tissues, matched paracancer tissues and lymph node tissues. Analyze the correlation between CD163 and Foxp3 in cancer tissues and lymph node tissues, as well as the relationship between clinicopathological characteristics and preoperative tumor markers. Results: M2 macrophages and Tregs were significantly positively correlated in cancer and lymph node tissues, which significantly increased in cancer and metastatic lymph node tissues. Interestingly, M2 macrophages in non-metastatic lymph nodes also increased significantly in patients with metastatic lymph nodes. Tregs stage I+II is higher than stage III+IV in paraneoplastic tissues. In addition, both CD163 and Foxp3 were upregulated with increasing tumor TNM stage, depth of infiltration, lymphatic metastasis, and depth of infiltration, and both were positively correlated with CEA. Conclusion: M2 macrophages and Tregs are important indicators of colorectal cancer progression and lymph node metastasis. There is a certain correlation between the two types of cells. It is possible that M2 macrophages, together with suppressor cells Tregs, promote an immunosuppressive environment.
High and Interrelated Rates of PD-L1+CD14+ Antigen-Presenting Cells and Regulatory T Cells Mark the Microenvironment of Metastatic Lymph Nodes from Patients with Cervical Cancer
