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Cystic Fibrosis Since 1938

Department of Pediatrics, Case Western Reserve University School of Medicine at Rainbow Babies' and Children's Hospital, Cleveland, Ohio

Correspondence and requests for reprints should be addressed to Pamela B. Davis, M.D., Ph.D., Department of Pediatrics, Case Western Reserve University School of Medicine at Rainbow Babies' and Children's Hospital, BRB 8th floor, 2109 Adelbert Road, Cleveland OH 44106. E-mail: pamela.davis{at}case.edu

ABSTRACT

Cystic fibrosis (CF) was distinguished from celiac disease in 1938. Then, it was a pathologic diagnosis, life expectancy was approximately 6 months, and the autosomal recessive disease was believed to arise from abnormal mucus plugging exocrine ducts. Death often occurred from lung infection. Discovery of the sweat electrolyte defect in 1953 and standardization of the sweat test in 1959 allowed identification of milder cases, and CF was no longer considered only a disorder of mucus. In 1955, establishment of centers with programs of aggressive, comprehensive care initiated striking improvement in longevity. The pillars of care established then (attention to nutrition, airway clearance, treatment of lung infection) remain today. In 1983, chloride transport was identified as the basic physiologic CF defect, accompanied by increased sodium reabsorption. In 1980, we learned that inflammation contributes independently to lung disease and constitutes an independent therapeutic target. In 1989, the discovery of the CF gene demonstrated the basic defect to be in a cAMP-regulated chloride channel. This afforded new diagnostic tests, opportunities for research, and prospects for using the gene as therapy. Since then, substantial advances in basic and clinical research catalyzed therapeutic improvements: median survival age now exceeds 30 years. The Cystic Fibrosis Foundation center network provides not only opportunity to conduct clinical trials but also means to disseminate new therapies. In the future, treatments directed at the basic defect can be expected, with concomitant improvements in morbidity and mortality.

Key Words: cystic fibrosis • Pseudomonas aeruginosa • sweat test

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