The T2-high asthma endotype involves allergy-mediated responses that involve eosinophils, interleukin (IL)-4, IL-5, IL-13, IgE, thymic stromal lymphopoietin (TSLP), leukotrienes, and prostaglandin D2 (PGD2) [7,8]. This evidence concerns the gene TSLP and allergic disease.