GRB2 and neoplasm: In line with our recent results that miR‐634 functions as tumor suppressor by targeting CYR61 through Raf‐ERK signaling, van Jaarsveld MT also found that the cell cycle regulator CCND1 and Ras‐MAPK pathway components GRB2, ERK2, and RSK2 were directly repressed by miR‐634 overexpression 17.