Muligheden for malign gastrisk tumor bør udelukkes, inden der indledes behandling af gastrisk ulcus med lansoprazol, da lansoprazol kan maskere symptomerne og forsinke diagnosen.
8 The possibility of malignant gastric tumour should be excluded before initiating treatment of gastric ulcer with lansoprazole, because lansoprazole can mask the symptoms and delay the diagnosis.