TSLP and allergic asthma: The dysfunctional airway epithelium and its derived cytokine TSLP represent a very dynamic upstream level within the multifaceted interplay of cellular and molecular complex pathways leading to airway inflammation, either type 2 one, including allergic and non-allergic asthma phenotypes, mostly outlined by eosinophilic inflammation, or T2-low one, featured by neutrophilic or paucigranulocytic patterns [16].