Abstract
Intensive chemotherapy (ICT) for a malignant disease in children may be associated with clinically significant mucosal lesions of the upper gastrointestinal tract. This prospective and randomized study was conducted to evaluate more thoroughly the mucosal damage and to find out whether vitamin A therapy might prevent the development of these lesions. Gastroduodenoscopy and non-invasive methods were used to examine a consecutive series of 20 patients (10 females, 10 males, aged 1-15 years) 4 weeks after initiating the therapy regimen. Half of the patients were randomized to take vitamin A supplements for 6 weeks. During a follow-up of 6 weeks, 13 (65%) reported some symptoms of the gastrointestinal (GI) tract, diarrhea and mouth pain being most prominent. Endoscopic abnormalities were found in 13 (65 %) subjects: esophagitis in 10, erosive duodenitis in 8, and gastritis in 7. Histologically, 11 subjects had duodenitis, 5 had gastritis, 3 had eosinophilic esophagitis, and 2 had lymphocytic esophagitis. Both endoscopic and histological abnormalities of the duodenum showed a close relationship with long-term (more than 2 weeks) granulocytopenia. The 4 patients with the most extensive endoscopic abnormalities were treated with HCl inhibitors, and re-endoscopy performed 4-8 weeks later showed complete recovery. The sugar permeability values, measured as the lactulose/mannitol ratio were comparable to the values obtained in the controls, and lactose intolerance was found in only 3 (20%) of the 15 children able to perform the breath test. Both the incidence of the reported GI symptoms and the endoscopically or histologically observed GI lesions were similar in the subjects randomized to take vitamin A supplements as in the controls. In this study, two-thirds of children with ICT showed erosive mucosal lesions of the upper gastrointestinal tract, and vitamin A therapy failed to prevent them. Endoscopic examination is recommended if a patient has severe symptoms indicative of mucosal pathology.