TNF and asthma: Neutrophilic asthma, which is considered as a non-T2 or T2-low asthma, has been defined by a raised neutrophil count in sputum samples without raised eosinophil counts and has been linked to the presence of activated Type 1 and Th17 cells, along with an over-expression of IFN-γ, TNFα, IL-1β, and IL-17.17