Our results indicate that rHuEPO stimulation regulates the expression of EPOR but not EPOR-T in MCF-7 cells as indicated previously.33 Finally, the analysis of EPOR mRNA levels in a panel of breast cancer cell lines suggests that the pattern of EPOR (functional and EPOR-T) expression does not correlate with the invasiveness of breast cancer cell lines (Figure 5). This evidence concerns the gene EPOR and breast cancer.