The clinicopathological significance of BRI3BP in women with invasive breast cancer.

Background: Invasive breast cancer (BC) is a highly life-threatening disease affecting women world-wide. While its early identification may benefit the provision of more effective therapies, several BC-associated factors may influence BC patients' therapeutic outcomes. Therefore, identifying novel prognostic and therapeutic targets for invasive BC can help with accurate prognosis and therapy-related decisions. The BRI3 binding protein () gene was found to be a principal gene in invasive BC cohorts using artificial neural network (ANN) techniques. Thus, this study aimed to evaluate the clinicopathological significance of BRI3BP at the transcriptomic and proteomic levels in invasive BC.

Methods: Two transcriptomic BC cohorts, the Molecular Taxonomy of Breast Cancer International Consortium (METABRIC; n=1,980) and The Cancer Genome Atlas (TCGA; n=854), were used to evaluate BRI3BP expression at the mRNA level. Formalin-fixed paraffin-embedded (FFPE) tissues from an invasive BC cohort (n=100) were also used to evaluate BRI3BP expression at the protein level via immunohistochemistry. The association between BRI3BP expression, clinicopathological characteristics, and patient outcomes was evaluated.

Results: In both METABRIC and TCGA cohorts, high expression of was significantly associated with aggressive tumor features such as high histological grade, large tumor size, and lymph vascular invasion (LVI) positivity. At the protein level, high BRI3BP expression was associated with high histological grade, hormone receptor negativity, high expression of Ki67, and poor outcome.

Conclusions: This study revealed the prognostic significance of BRI3BP in invasive BC patients. Further functional assessment is needed to confirm the biological role of BRI3BP in BC.