The effect of combination chemotherapy on human small intestinal morphology and disaccharidase activities and their relation with clinical and chemical (fecal wet weight and K-excretion) parameters for gastrointestinal toxicity were evaluated in patients with disseminated malignant melanoma receiving enteral normoalimentation (NA). Also evaluated were the supposed protective effects on gastrointestinal toxicity of enteral hyperalimentation (HA) with an elemental diet. After chemotherapy, a comparable decrease in villus height, total mucosal height, and mitotic index was found in jejunal biopsy specimens of both groups. However, in the NA group, the crypt depth decreased (in contrast to the HA group), whereas the disaccharidase activities in the HA group deteriorated to lower values than in the NA group. The authors found no correlation between disaccharidase levels and mucosal morphology, nor was there a correlation between these variables, fecal parameters and clinical diarrhea, suggesting that diarrhea occurring after chemotherapy was not due to loss of mucosal tissue or decrease in enzyme activities. A protective effect of HA with an elemental diet on gastrointestinal toxicity could not be established.
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