However, due to the different CFTR gene profiles in different populations (such as the p. Gly970Asp mutation being more common in Chinese people than the p. Phe508del mutation being the most common in Caucasians) [12], the types of pathogenic genes in PCD are diverse and constantly increasing [13], and the causes of hereditary bronchiectasis are diverse and difficult to distinguish, which limit the use of the above genetic testing methods. The gene discussed is CFTR; the disease is bronchiectasis.