A high density of FoxP3+ Treg cells infiltrating the tumor stroma is considered a poor prognostic factor in numerous types of tumor (Gao et al. 2007; Hiraoka et al. 2006; Kobayashi et al. 2007; Merlo et al. 2009; Sasada et al. 2003; Xue et al. 2010). The gene discussed is FOXP3; the disease is neoplasm.