APOC1 and esophageal squamous cell carcinoma: The results of this study showed that in ESCC tissue, a variety of immune infiltrating cells were positively correlated with APOC1 expression such as T cells (r = 0.376, p < 0.001); aDC (antibody-dependent cytotoxicity) (r = 0.411, p < 0.001); CD8T cells (r = 0.402, p < 0.001), cytotoxic cells (r = 0.463, p < 0.001), iDC (immature dendritic cell) (r = 0.507, p < 0.001), macrophages (r = 0.551, p < 0.001), NK CD56 dim cells (r = 0.381, p < 0.001), Th1 cells (r = 0.346, p = 0.002), and Treg (r = 0.460, p < 0.001) (Figures 8A, B).