PTPRC and cancer: The expression patterns of CXCR3 in tumors were quite different; some tumors (55%) expressed CXCR3 in CK8+ epithelial cancer cells, some (33%) in the stroma, but most tumors (85%) showed a scattered expression pattern of CXCR3 throughout the tissue, which overlapped with the expression of the pan-leukocyte marker CD45 (Figure 4A, D).