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Hierarchical clustering of miRNA expression. The BC samples were classified into 2 different groups (response vs. no response to systemic treatments) based on expression levels. Each column represents a patient with MBC, and each row represents a single miRNA. The expression of miRNAs is represented in blue (upregulated), red (downregulated) and white (no significant change or absence of data). BC, breast cancer; MBC, metastatic breast cancer.
