RPS6KB1 and neoplasm: Transfection of SALL1 but not mutated SALL1 in both MCF-7 and E0771 breast tumor cells significantly induced the phosphorylation of mTOR, p70S6K, and 4E-BP1, further confirming the activation of mTOR signaling in tumor cells after SALL1 expression (Fig. 6d).