Complications of 5-azacytidine: Three cases of severe ischemic colitis in elderly patients with myelodysplastic syndrome. Posted byadmin 28. July 2020 Melchardt T, Weiss L, Pleyer L, Steinkirchner S, Auberger J, Hopfinger G, Greil R, Egle A. http://www.ncbi.nlm.nih.gov/pubmed/24260071