In another study, researchers prepared [4-14C]-cholesterol labeled LyP-1-targeted liposomes containing phosphatidylethanolamine polyethylene glycol2000 (PE-PEG2000) or PE-PEG750 (to evaluate the effect of PE-PEG length on the interaction of liposomes-anchored moieties to receptors) and administrated them to tumor-bearing C57BL/6 mice with B16-F1 cells. This evidence concerns the gene PTPN22 and neoplasm.