Thymic stromal lymphopoietin (TSLP) an analogous of IL-7 cytokine, is a critical factor linking responses at interfaces between the body and the environment, expressed by various cell types such as epithelial cells and epidermal keratinocytes, mast cells, airway smooth muscle cells, fibroblasts, dendritic cells, trophoblasts, and cancer or cancer-associated cells [80]. The gene discussed is IL7; the disease is cancer.