Th17 cytokine levels decline after chemotherapy in ALK⁺ALCL patients. Cytometric bead array to assay the concentrations of IFN-γ, IL-17A, IL-8, IL-22, IL-6, and TNF-α in serum of ALK⁺ALCL patients pre- and postchemotherapy. The patients received a dose-adjusted EPOCH (etoposide, prednisone, vincristine, cyclophosphamide, and doxorubicin) treatment but without rituximab.