CD4 and neoplasm: Outcomes demonstrated that the MWA group activated anti-tumor immune response, and the proportion of intratumoral CD4+ IFN-γ+ T cells (1.640 ± 0.7686%) and CD8+ IFN-γ+ T cells (1.430 ± 0.1609%) in abscopal tumors from the MWA group were significantly increased when compared with the control group (CD4+ IFN-γ+ T cells 0.3533 ± 0.07506%) (CD8+ IFN-γ+ T cells 0.4867 ± 0.1172%) (p < 0.05, Figure 3D; p < 0.01, Figure 3E).