Table 1.

Increased incidence of lymphoma in transgenic mice

Lineage	Copy no.	Age range, months	n	%Lymphoma (n)*
3	10	<12	13	0
		12–18	12	41.7 (5)
		>18	41	51.2 (21)
6	2	<12	8	0
		12–18	11	18.2 (2)
		>18	26	23.1 (6)
9	5	<12	3	33.3 (1)
		12–18	8	37.5 (3)
		>18	12	50.0 (6)
Total	–	<12	24	4.2 (1)
		12–18	31	32.3 (10)
		>18	79	41.8 (33)
Control	0	>18	43	11.6 (5)

^*Fisher’s exact test indicates P values of 0.0001, 0.31, and 0.008 for lineages 3, 6, and 9, respectively, compared to negative controls.