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Am. J. Respir. Crit. Care Med., Volume 162, Number 3, September 2000, 1115-1119

Frequent Genetic Alterations at the Microsatellite Level in Cytologic Sputum Samples of Patients with Idiopathic Pulmonary Fibrosis

DIMITRIS A. VASSILAKIS, GEORGE SOURVINOS, DEMETRIOS A. SPANDIDOS, NIKOLAOS M. SIAFAKAS, and DEMOSTHENES BOUROS

Department of Pneumonology and Laboratory of Virology, Medical School, University of Crete; University Hospital, Heraklion, Greece

Idiopathic pulmonary fibrosis (IPF) is a disease of unknown etiology associated with DNA damage and malignancy. Bronchogenic carcinoma is the cause of death in 10% to 13% of IPF patients. Microsatellite instability (MSI) and loss of heterozygosity (LOH) are frequently detected in cancers. If these genetic alterations could be observed in IPF, they might explain the higher relative risk of lung cancer in this disease. We investigated the incidence of MSI and LOH in sputum cytologic specimens from 26 IPF patients and 26 healthy, matched subjects, using 10 highly polymorphic microsatellite markers. The electrophoretic pattern of each specimen was compared with that of corresponding peripheral blood. Thirteen (50%) patients showed genetic alterations, consisting either of MSI or LOH. Five (19%) patients exhibited MSI and 10 (39%) exhibited LOH in at least one microsatellite marker. Three (12%) patients showed LOH in more than one marker. None of the healthy subjects exhibited genetic alterations in the studied markers. No correlation was found between the detected genetic alterations and age, disease duration, blood gases, or spirometric parameters of the patients. Our findings suggest that the genetic alterations that we studied are frequent in IPF, are apparently unrelated to the severity of the disease, and may be related to tumorigenesis.




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