Table 1

 Studies of lymphoma risk in inflammatory bowel disease (IBD)

Author, yearIBDNo of subjectsLymphomasRelative risk (95% CI)
CD, Crohn’s disease; UC, ulcerative colitis; NS, not specified; 95% CI, 95% confidence interval.
Lewis1 2001CD660571.6 (0.6–3.3)
Arseneau2 2001CD5426212.0 (1.3–3.1)
Bernstein3 2001CD285792.4 (1.2–5.0)
Mellemkjaer37 2000CD264561.4 (0.6–1.3)
Palli38 1998CD231110
Loftus6 2000CD21642.4 (0.1–13)
Persson7 1994CD125141.3 (0.4–3.4)
Munkholm8 1993CD37300.0
Ekbom12 1991CD165510.4 (0.0–2.4)
Gyde10 1980CD51311.0
Lewis1 2001UC10391111.1 (0.5–2.2)
Bernstein3 2001UC267271.0 (0.5–2.2)
Palli5 2000UC68964.2
Loftus6 2000UC23800.0 (0.0–6.4)
Karlén11 1999UC154731.2 (0.3–2.5)
Mellemkjaer4 1995UC554671.4 (0.5–1.3)
Ekbom12 1991UC312181.2 (0.5–2.4)
Madjlessi28 1986UC124833.4 (0.7–10)
Prior9 1982UC67632.0
Farrell14 2000NS782431 (2.0–64)
Masel15 2000NS479156.7
Connell16 1994NS75500.0
Greenstein17 1985NS196186.1
All studies above1221.8