<p>PDCD4 protein expression was significantly higher in prostate cancer cells transfected with the miR-21-inhibitor before Il-6 treatment than in cells not transfected with the inhibitor (one-way ANOVA test: <i>F</i> value = 241.781, <i>P</i> < 0.05). Levels of PDCD4 protein expression in transfected and nontransfected cells of both cell lines were significantly different (LSD test: <i>P</i> < 0.05).</p