Serum miRNA-21: Elevated levels in patients with metastatic hormone-refractory prostate cancer and potential predictive factor for the efficacy of docetaxel-based chemotherapy - Zhang, H L; Yang, L F; Zhu, Y; Yao, X D; Zhang, S L; Dai, B; Zhu, Y P; Shen, Y J; Shi, G H; Ye, D W (Prostate, 2011)