EPOR and neoplasm: We used the polyclonal antibody (M-20) previously shown to have a reliable specificity (Lopez et al. 2011) to identify the EpoR by Western blot and immunohistochemistry, since the anti-EpoR antibody (C-20 Santa Cruz Biotech) has been reported to cross-react with HSP70, which is also highly expressed in tumor tissue (Brown et al. 2007).