To further confirm whether the anti-metastatic effect of TAMpepK is related to the infiltration of cytotoxic CD8+ T cells (the key players that fight against cancer) into tumor colonies, we investigated the correlation between TAMs and CD8+ T cells in pulmonary nodules in tail vein injection cancer-challenged mouse lungs using immunofluorescence staining (Figure 5A). Here, CD8A is linked to cancer.