CCL17 and Hodgkins lymphoma: Among the molecules potentially involved in modulating the pattern of T-cell infiltration, TARC (thymus and activation-regulated chemokine), a chemokine able to attract activated Th2 cells, was found on immunohistochemical staining to be highly expressed in most-classical HL, but not in lymphocyte-predominant HL and non-Hodgkin lymphomas (NHL).