Specific inhibitors of RAF and MEK kinases to target BRAF– and RAS-mutant tumors are developing. Interestingly, BRAF/MEK inhibitor combination treatment blocks phosphorylated extracellular signal-regulated kinase (phospho-ERK) reactivation in melanoma cells, a phenomenon that may possibly reduce the emergence of clinical resistance.  ERK represents an attractive downstream target to exploit. SCH772984...