Miller et al. in a population-based retrospective matched-cohort study, evaluated if CF carriers were more susceptible to 59 examined CF-related conditions (asthma included), and found that CFTR mutation heterozygosity was significantly associated with an increased risk of asthma (OR =1.36, 95% CI: 1.29–1.43, p < 0.001) [6]. Here, CFTR is linked to asthma.