Table 3. Comparison between survivin positive and negative expression, subdivided into zero, 1, 2 and 3, in high- and low-grade ductal carcinoma in situ .

Survivin	Nuclear grade classification n (%)
	Low	High
0 negative	4 (100)	0
1 negative	3 (60.00)	2 (40.00)
2 positive	2 (66.70)	1 (33.30)
3 positive	4 (16.00)	21 (84.00)

Fisher's exact test: p=0.001.