RAF1 and neoplasm: Similar to our in vitro observations, depletion of Raf‐1 led to profound tumour growth arrest (Figure 5A, shRaf‐1), whereas overexpression of p70S6K abolished this growth arrest (Figure 5A, shRaf‐1 + OE‐p70S6K), which was further confirmed by comparing tumour weights between these two groups (Figure 5B).