The iTr35 cells have been shown to be the primary type of cells that secrete IL‐35.[4] CD8+ Tregs, Bregs, and tolerogenic dendritic cells are also cellular sources of IL‐35.[1, 6, 10, 11] We then analyzed the composition of bone marrow lymphocytes in ITP patients. Here, CD8A is linked to autoimmune thrombocytopenic purpura.