Furthermore, a potential role of CD8+ T cells in the pro‐tumorigenic effect of activin should be determined, since these cells had been shown to be either pro‐ or anti‐tumorigenic in different experimental skin cancer models (Yusuf et al, 2008; Kwong et al, 2010; Nasti et al, 2011). The gene discussed is CD8A; the disease is skin neoplasm.