STMN1 and breast cancer: Overexpression of miR-770 significantly decreased stathmin 1 (STMN1) expression, increasing doxorubicin sensitivity and metastasis in both BC lines and, in a xenograft mouse model, miR-770 promoted TNBC treatment sensitivity through the EV-mediated transfer of miR-770 to TAMs, suggesting that TNBC loss of miR-770 represents a key mechanism of chemo-resistance acquisition [142].