MPO and neoplasm: These showed the following significant correlations: pCXCR4 TIC expression with CXCR4 TIC expression (rho = 0.394; p = 0.019), pCXCR4 tumor expression with CXCR4 tumor expression (rho = 0.507; p = 0.002), CXCR4 TIC expression with MPO (rho = 0.577; p < 0.001) and CD66b (rho = 0.414; p = 0.006), CXCR4 tumor expression with OX40 TIC expression (rho = 0.441; p = 0.003) and OX40 tumor expression (rho = 0.576; p < 0.001), pCXCR4 tumor expression with OX40 TIC expression (rho = 0.338; p = 0.047) and OX40 tumor expression (rho = 0.376; p = 0.026).