Background. Chemotherapy has become a standard of treatment in managing breast cancer. To achieve proper treatment for\nthe right patients, the predictive marker is needed. Ki-67 is a biomarker of proliferation for solid tumor. Studies mentioned\nassociation of Ki-67 expression with chemotherapy response. The study aims are to evaluate whether Ki-67 expression detected\nby immunohistochemistry (IHC) and quantitative real-time polymerase chain reaction (qRT-PCR) may predict clinical response\nto neoadjuvant chemotherapy in breast cancer. Methods.This study utilized a longitudinal study. IHCand qRT-PCR methods were\nused for detection of Ki-67 expression. Chemotherapy response was calculated using RECIST. Data were analyzed with Chi-square\nand Wilcoxon�s test. Results. There were 48 subjects in this study. Analysis of Ki-67 expression with chemotherapy response has\na significant correlation with
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