Abstract
Objective : To analyze the association of Ki-67 expression and response of neoadjuvant chemotherapy in patients with invasive breast cancer. Methods : A retrospective observational study on the association of Ki-67 expression and response of neoadjuvant chemotherapy in patients with invasive breast cancer was conducted. This study included twenty-five female patients with invasive breast cancer who met the inclusion criteria. Parameters analyzed were age, tumor size, and immunohistochemical expression of Ki-67. Size of the tumor at pre- and post-neoadjuvant chemotherapy were obtained in cm3 and compared between 3 groups of Ki-67 expression levels. One way ANOVA was used to perform the statistical analysis. Results : A significant difference in changes of tumor size for Ki-67 level >20% compared to 20%. Conclusions : Low to modest expression of Ki-67 was a better biomarker to predict the response of neoadjuvant chemotherapy in patients with invasive breast cancer compared to high expression of Ki-67. However, the cut-off value of 20% could be ideal to predict the outcome of neoadjuvant chemotherapy in patients with invasive breast cancer. DOI: 10.15850/ijihs.v6n2.1374
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