Tumor cells were reported to acquire immune regulatory molecules from tumor-infiltrating lymphocytes via trogocytosis or exosome transfer.23,24 Moreover, in the circulating CT26 tumor study above, CD45 expression was detected on the surface of CD45− CT26 cells after tail vein injection of the tumor cells into the circulation of Balb/C mice (Fig. 1g). The gene discussed is PTPRC; the disease is neoplasm.