These findings are consistent with known sources of TGF‐β, which mainly include cancer‐associated fibroblasts, myeloid cells, and cancer cells.[61, 62, 63] In summary, these results suggested the complex and diverse communication across B cells, macrophages, T cells, and other stromal cells, among which the TGF‐β‐related signaling pathway was a vital mediator. The gene discussed is TGFB1; the disease is cancer.