Triple-negative breast cancer presents an aggressive form of breast cancer subtype,
which further lacks efficient treatment strategies and prognostic markers. Genomic heterogeneity
in TNBC has led to the relapse of tumor and cancer stem cells with a higher likelihood of distal metastasis.
Several studies supported the notion that miRNAs may act as oncogene or tumor suppressors
in TNBC. miRNAs may function as a global regulator of TNBC by targeting post-transcriptional
regulation of several genes involved in influencing metastatic events, but the exact mechanism
involved in inducing the effect is yet to be elucidated. In this review, we summarized miRNA expression,
which can functionally suppress metastatic cascade in TNBC by targeting epithelial to
mesenchymal transition, metastatic colonization, cancer stem cells, invasion, migration and metastasis.
miRNAs may appear as a metastatic biomarker to predict distal reoccurrence of TNBC in
lungs, brain and lymph nodes. miRNA can act as a prognostic marker in metastatic TNBC, thereby
predicting overall survival, disease-free survival and distant metastasis-free survival in affected patients.
The present review article is an attempt to gain an insight into the repertoire of miRNA that
may emerge out as an effective treatment strategy, novel biomarker of distal reoccurrence and prognostic
marker in metastatic TNBC.