Clinical characteristics and genetic analysis of cystic fibrosis transmembrane conductance reseptor-related disease.

Background: Cystic fibrosis (CF) transmembrane conductance receptor (CFTR)-related disease is diagnosed in patients affected by CFTR dysfunction who do not fully meet the CF diagnostic criteria. Only 2% of all CF patients have CFTR-related disease. We define the demographic characteristics of such patients, described the performance of mutational analyses, and describe the clinical findings.