PECAM1 and cancer: The results showed that 19 cell clusters, including cancer cells (3 subsets, Ki-67+-, Ki67+, and Ki67-), four groups of macrophages, one group of monocytes, one group of Ly6g+ cells (neutrophils), and six groups of endothelial cells (CD31+ cells), as well as four immune cell populations, exhibited cell-cell interactions (Fig. 7B and sTable 5).