Interestingly, both AD and SS show increased production of Th2 cytokines such as interleukin 4 (IL-4), interleukin 5 (IL-5), and interleukin 13 (IL-13) as well as CCR4-binding chemokines that is characteristic also of the acute phase of AD [13–15]. The gene discussed is IL4; the disease is synovial sarcoma.