METTL3 and retinoblastoma: METTL3 overexpression in RB cells increased p‐PI3K‐p85, p‐AKT, p‐mTOR and p‐P70S6K levels, but it decreased p‐4EBP1, while the levels of non‐phosphorylated PI3K‐p85, AKT, mTOR and P70S6K and 4EBP1 were not significantly different (Figure 4E,F).