Abstract
We have confirmed heterogeneity in CF using a different combination of primary clinical variables than those used in previous studies. Subgroupings of individuals with similar levels of sweat chloride were independent of the clustering based on level of pancreatic enzyme supplementation and degree of pulmonary involvement. Data from families with multiple CF children are consistent with the hypothesis that the genetic etiology of CF involves two or more genes that modify the expression of the primary gene defect.
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