an increasing trendP > 0.05
With tumor progression, the proportions of cells exerting antitumor immune responses, including CD8 + T cells ( P < 0.001), NK cells ( P < 0.001), and M1-type macrophages ( P < 0.05), were significantly reduced at 28 days compared with mice at 0 day or 7 days, while the proportion of MDSCs, which promoted tumor progression, was significantly increased ( P < 0.05), and Treg also showed an increasing trend ( P > 0.05) (Fig. 2 A–G).