CCL17 and classic Hodgkin lymphoma: Jachimowicz et al. [74] demonstrated the association of three genes, TNFRSF8 (encoding CD30), CCL17 (encoding TARC) and PDGFRA, with progression-free survival (PFS) in advanced-stage BEACOPP-treated cHL patients and suggested the GEP assay for risk assessment before treatment.