However, TSLP can be produced also by airway smooth muscle cells (27), human DCs (26) and mast cells (16, 25, 28, 29), human monocytes (26), macrophages and granulocytes (30), synovial (31) and cancer-associated fibroblasts (CAF) (32), murine basophils (33), and cancer cells (34). The gene discussed is TSLP; the disease is cancer.