Relationship between the expression of Ki-67 and molecular classification and clinical patho-logical features in breast cancer / 临床与实验病理学杂志

ABSTRACT

Purpose To study the expression of Ki-67 in breast cancer with different molecular classification, and to discuss the rela-tionship between the expression of Ki-67 and clinical pathological features in breast cancer. Methods All 245 patients with breast cancer were divided into different molecular classification through detecting the expression of ER, PR, HER-2 by immunohistochemical method. The expression of Ki-67 was also detected, and to study relationship between the expression and clinical pathological features. Results The difference of Ki-67 index was statistically significant in different molecular classification of breast cancer. Ki-67 index in patients with lymph node metastasis and larger tumor size were higher than that with no metastasis and smaller tumor size. Ki-67 index in patients with ER and PR positive were lower than that negative, the difference was statistically significant. Ki-67 expression differ-ence was not statistically significant between the two groups according to the median age (50 years old). But when patients were divid-ed into young and elderly groups by≤40 and≥60 years old, Ki-67 index in young group was more higher than that in elderly group. Conclusion Ki-67 index in patients with triple-negative breast cancer, young age, lymph node metastasis, larger tumor size and ER and PR negative were higher. Ki-67 can be used as an important indicator to determine breast cancer prognosis.