MAPK8 and breast carcinoma: The expression levels of Prss14/epithin (ST14), PKCβ (PRKCB), and three JNKs (MAPK8, MAPK9, and MAPK10) in more aggressive ER-negative (ER−) and less aggressive ER-positive (ER+) breast cancer patients were compared individually in the plot (Fig. 6A).