CCR4 and neuroblastoma: CCL19 and CCL22 are ligands for T cells that express CCR7 (naïve and central memory stages of differentiation) or CCR4 (Th2 cells and regulatory T cell), so we propose that MDC, and more specifically the CD1c+ and CD141+ subsets can induce T-cell recruitment in neuroblastoma by means of CCL19 and CCL22.