MAPK8 and neoplasm: Moreover, downregulation of c-Jun or miR-21 [by treating MDA-MB-468 cells with c-Jun siRNA, JNK inhibitor or transfected MDA-MB-468 cells with an anti-miR-21 inhibitor (but not scrambled sequence siRNA or with miRNA-negative control)] effectively attenuates HA-mediated tumor cell growth/anti-apoptosis/survival and enhances chemotherapy sensitivity in MDA-MB-231 cells (Table 2A & B).