FOXM 1 Expression in Breast Carcinoma and Correlation with Histopathological Staging and Grading

Abstract

FOXM1 (Forkhead box protein M1) promoted EMT (Epithelial-to-mesenchymal transition) in breast cancer by binding and activation of the promoter of SLUG gene. that FOXM1 promotes breast cancer metastases by activation of the TGF-β pathway with through interaction SMAD3 (this prevented E3 ubiquitin-protein ligase transcriptional intermediary factor 1 γ [TIF1 γ] binding to SMAD3 and protected SMAD4 from ubiquitination) that leads to stabilization of the SMAD3/SMAD4 complex. The study samples included seventy four formalin-fixed, paraffin embedded tissue blocks which have been diagnosed as forty four cases of breast carcinoma and their lymph nodes. In the present study from 74 total cases, 46 cases (62.6%) were showing FOXM1 marker positive while 28 cases (37.8%) were showing negative immunohistochemistry for FOXM1 marker. Sub classification of malignant cases, 16 malignant breast cancer cases (36.4%) showed no FOXM1 expression, while 12 malignant cases (27.3%) were strongly positive for FOXM1 expression. There is significant correlation between breast carcinoma grade, stage and FOXM1 expression.