Another study used ELISAs with platelet and plasma samples from 35 patients with colon cancer and 84 age‐matched healthy individuals to compare the levels of, vascular endothelial growth factor (VEGF), basic fibroblast growth factor (bFGF), platelet‐derived growth factor (PDGF), PF4, and thrombospondin‐1 (TSP‐1). Here, PF4 is linked to colonic neoplasm.