Abstract:
Background: This study was carried out to evaluate the prognostic value of KIBRA in breast cancer.
Methods: This retrospective study included breast cancer patients who sought the services of the immunohistochemistry
laboratory of our unit from 2006 to 2015. Tissue microarrays were constructed and immunohistochemical staining was
done to assess the KIBRA expression. The Kaplan-Meier model for univariate and Cox-regression model with backward
stepwise factor retention method for multivariate analyses were used. Chi square test was used to find out the
associations with the established prognostic features.
Results: A total of 1124 patients were included in the study and KIBRA staining of 909 breast cancers were available for
analysis. Cytoplasmic KIBRA expression was seen in 39.5% and nuclear expression in 44.8%. Overall KIBRA–low breast
cancers accounted for 41.5%. KIBRA nuclear expression was significantly associated with positive ER and PR expression.
Luminal breast cancer patients who had endocrine therapy and KIBRA-low expression had a RFS disadvantage over
those who were positive for KIBRA (p = 0.02). Similarly, patients who received chemotherapy and had overall KIBRA-low
expression also demonstrated a RFS disadvantage compared to those who had overall positive KIBRA expression
(p = 0.018). This effect of KIBRA was independent of the other factors considered for the model.
Conclusion: Overall low-KIBRA expression has an independent effect on the RFS and predicts the RFS outcome of
luminal breast cancer patients who received endocrine therapy and breast cancer patients who received chemotherapy.
