Association of higher proliferation of Ki67 with unfavorable prognostic factors and shorter survival in breast cancer.

Abstract

e11083 Background: The prognostic value of Ki67 expression level is yet unclear in breast cancer (BC). The aim of this study was to investigate the association between Ki67 expression levels and other prognostic factors in BC. Methods: Demographic, clinical and pathological features of the pts were retreived from the hospital records. Results: In this study, 163 pts with BC were analyzed. The mean age of the pts was 53.4±12.2 years. Median Ki67 level was 20% in this study. Ki67-high tumors were significantly associated with high grade (p<0.001), lymphovascular invasion (p=0.001), estrogen receptor negativity (ER-) (p=0.035), Her2 (+) (p=0.001), advanced stage (p<0.001) and lymph node involvement (LNI) (p<0.003) of the tumor. There was no relationship between the age, perineural invasion, progesterone receptor and Ki67 positivity. Lower Ki67 levels were significantly associated with longer median relaps-free survival (RFS) compared to those of higher Ki67 levels (p=0.008). The overall survival (OS) was longer in pts with lower Ki67 levels than those with higher levels (p=0.017). Conclusions: High Ki67 expression was associated with ER-, Her2 (+), higher grade and LNI in BC. The level of Ki67 expression was a prognostic factor predicting the RFS and OS in BC pts. [Table: see text]