FPR2 and cancer: Besides neutrophils, FPR2 is also expressed by a variety of immune cells (e.g., monocytes/macrophages, natural killer cells, dendritic cells, and T cells) and non-immune cells (e.g., keratinocytes, intestinal epithelial cells, endothelial cells, and synovial fibroblasts), and they participate in infection responses, pathogenesis of inflammation, and in cancer (25).