CCR4 and primary cutaneous T-cell non-Hodgkin lymphoma: Subsequent studies by others confirmed the expression of CCR4 in archived adult T cell lymphoma tissues (Ishida et al., 2003) and also showed CCR4 to be abundantly expressed by other neoplasms including some peripheral T cell lymphoma and NK cell lymphomas (Ishida et al., 2004) and cutaneous T cell lymphomas (Campbell et al., 2010, Ferenczi et al., 2002).