Reduced Let-7a Is Associated with Chemoresistance in Primary Breast Cancer Wu, Jiannan ; Li, Shunrong ; Jia, Weijuan ; Deng, Heran ; Chen, Kai ; Zhu, Liling ; Yu, Fengyan ; Su, Fengxi Abstract Publication: PLoS ONE Pub Date: July 2015 DOI: 10.1371/journal.pone.0133643 Bibcode: 2015PLoSO..1033643W