MRTFA and breast cancer: For example, miR-200c delivered by solid lipid nanoparticles attenuates the chemoresistance of breast CSCs [39]; miR-206 attenuates the migratory ability and stemness of breast cancer by targeting MKL1 (Myocardin-Like Protein 1) /IL11 (Interleukin11) signaling [40], and we recently indicated that miR-873 attenuated breast cancer stemness by directly targeting PD-L1 [41].