CD4 and neoplasm: TSLP was secreted by CAFs when activated with tumour‐derived pro‐inflammatory cytokines, including tumour necrosis factor‐α and IL‐1β, and these TSLP‐containing supernatants upregulated expression of TSLPR on myeloid DCs, which secreted Th2‐attracting cytokines and promoted Th2 cell polarisation of CD4+ T cells.