CCL17 and classic Hodgkin lymphoma: Because we observed differences in CCL17 and CCL22 expression between ALCL and cHL cells and because both of these chemokines are important factors for the attraction of T cells to the microenvironment, we systematically assessed the microenvironmental composition of ALCL and cHL cases, as the tumor microenvironment can impair or promote the active movement and dissemination of lymphoma cells [35].