CCL17 and Hodgkins lymphoma: Di Stasi et al. showed that C-C Motif Chemokine Receptor 4 (CCR4) expression in CD30-directed chimeric antigen receptor (CAR) T cells improved migration towards CD30+ Hodgkin lymphoma, which secreted the CCR4 ligand CCL17 (C-C Motif Chemokine Ligand 17).