RT Journal Article SR Electronic T1 Genetic instability in colorectal cancer JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 450 OP 451 DO 10.1136/gut.43.4.450 VO 43 IS 4 A1 H J W THOMAS YR 1998 UL http://gut.bmj.com/content/43/4/450.abstract AB