As sIL2R could be elevated in all CD4+ T cell-mediated inflammatory processes, it is not specific for diagnosing sarcoidosis, though it might still be useful in assessing the disease activity of sarcoidosis.39 IL2R binds IL2, which is a cytokine released by CD4+ T cells and induces proliferation of T cells. The gene discussed is IL2; the disease is sarcoidosis.