With respect to the preliminary data from this pilot trial, budesonide with its high topical and low systemic effects seems to be of therapeutic clinical benefit in collagenous colitis. A therapeutic effect could be demonstrated for both therapeutic goals, the clinical response and morphological changes. Further studies on the effects of budesonide on mucosal collagen metabolism and long-term follow-up are warranted.

Our data suggest an important role of vascular endothelial growth factor in counteracting the local imbalance of fibrogenesis and fibrolysis, leading to an accumulation of immature subepithelial matrix in collagenous colitis.

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