PTPRC and neoplasm: Of the 19 (Keratin + /DAPI + /CD45-) cells extracted from the prostatic plexus, 10 were identified as tumor cells and 9 as normal epithelial cells; of the 7 (Keratin + /DAPI + /CD45-) cells from the peripheral blood, 4 were identified as tumor cells and 3 as normal epithelial cells (Fig. 3).