MAPK8 and Miyoshi myopathy: A positive correlation between BAFF expression and the activation of JNK pathway in human MM cells has been recently reported, suggesting that JNK activation and BAFF expression in MM cells may form a positive feedback loop promoting the survival and proliferation of MM cells [22] Moreover, activation of TACI receptor may upregulate cyclin D2 and integrin beta7, following c-maf upregulation.