Neoplastic progression in ulcerative colitis: histology, DNA content, and loss of p53 allele - Burmer,G.C.; Rabinovich,P.S.; Haggitt,R.C.; Crispin,D.A.; Brentnall,T.A.; Kolli,V.R.; Stevens,A.C.; Rubin,C.E. (Gastroenterology, 1992)