IL1RL1 and asthma: Here, we explored the expression of IL1-RL1 in induced sputum supernatant, induced sputum cells and serum of patients with asthma, compared the changes of IL1-RL1 in patients with asthma after 4 weeks of ICS treatment, and analyzed the correlation between the expression of IL1-RL1 and Th1 cytokines and Th2 cytokines in patients with asthma.