Cancer cell–produced IL-1β was previously shown to induce TSLP in breast or pancreatic cancers (8, 62, 63), but ex vivo culture of epidermis from WT mice with IL-1β did not induce TSLP production (Supplemental Figure 15), suggesting that, at least on its own, IL-1β does not induce the expression of epidermal TSLP. Here, IL1B is linked to cancer.