Table 3 Incidence of lymphoma in RA patients²⁹,³⁰,³¹,³².

Study	Country	No. of patients with RA	Years of follow up, mean (max)	SIR for cancer	SIR for lymphoma (odds ratio/RA activity level)
Gridley et al29	Sweden	11 683	8.6 (20)	1.0	2.0
Mellemkjaer et al30	Denmark	20 699	7 (15)	1.1	2.5
Isomaki et al31	Finland	46 101	4.6 (7)	1.1	2.7
Adalimumab 2005	Global	10 024*	1.2 (7.7)	1.06	3.19
					1.0 (low)
Baecklund et al32	Sweden	11 683	8.6 (20)	–	5.4 (medium)
					25.8 (high)

*As of 15 April 2005.