Table 2. Relationship between PLK1 expression in papillary carcinoma and tumour size.

	PLK1 expression
	Low		High
	−	+	++	++	Total
⩽0.3 cma,b	2	2	6	2	12
>0.3 cm, ⩽1.0 cmb	8	1	11	4	24
>1.0 cm, <4.0 cmc	9	15	10	2	36
>4.0 cmc	7	5	0	3	15
Total	26	23	27	11	87

^aThese carcinomas were incidentally found in surgical specimens resected for other thyroid diseases (incidental carcinoma).

^bvs

^cP=0.0020.