Background Pulmonary Langerhans'-cell histiocytosis is an uncommoninterstitial lung disease in adults. It has an unpredictablecourse and may be associated with an increased susceptibilityto the development of malignant neoplasms.
Methods We reviewed the records of 102 adults with histopathologicallyconfirmed pulmonary Langerhans'-cell histiocytosis to ascertaintheir vital status and whether cancer had been diagnosed. Thehealth status of surviving patients was quantified with theuse of the 36-Item Short-Form General Health Survey. Factorspotentially associated with survival after the diagnosis ofpulmonary Langerhans'-cell histiocytosis were analyzed withthe Cox proportional-hazards model.
Results The median follow-up period was 4 years (range, 0 to23). There were 33 deaths, 15 of which were attributable torespiratory failure. Six hematologic cancers were diagnosed.The overall median survival was 12.5 years, which was significantlyshorter than that expected for persons of the same sex and calendaryear of birth (P<0.001). In a univariate analysis, variablespredictive of shorter survival included an older age (P=0.003),a lower forced expiratory volume in one second (FEV1) (P=0.004),a higher residual volume (P=0.007), a lower ratio of FEV1 toforced vital capacity (P=0.03), and a reduced carbon monoxidediffusing capacity (P=0.001).
From the Thoracic Diseases Research Unit, Division of Pulmonary, Critical Care, and Internal Medicine (R.V., J.H.R., A.H.L.), and the Departments of Health Sciences Research (D.R.S., P.A.D.) and Biochemistry and Molecular Biology (A.H.L.), Mayo Clinic and Foundation, Rochester, Minn.
Address reprint requests to Dr. Vassallo at the Mayo Clinic, Stabile Bldg. 8-54, 200 First St. SW, Rochester, MN 55905, or at vassallo.robert{at}mayo.edu.
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