Table 1.

Frequency of Poorly Differentiated Thyroid Carcinomas Developed in Tg-STRN-ALK Mice

Goitrogen	Mouse strain	Age group, months
		3	6	12
No	WT	0/8	0/8	0/9
	Tg-STRN-ALK	0/9	0/8	4/18 (22)
Yes	WT	0/5	0/6	0/17∗
	Tg-STRN-ALK	0/7	0/9	5/14 (36)∗

Data are given as n/total (percentage).

WT, wild type.

^∗WT versus Tg-STRN-ALK, P = 0.047 (χ² test).