Ki-67 index Grade1 Grade2 Grade3 Total
High(>50/10hpf) 0 7 13 20
Low(<50/10hpf) 4 8 0 12
Total 4 15 13 32
Χ2 = 66.098 Df=6 P<0.05
Table 3: Correlation between Ki-67 index and FNCLCC grading.