The Western blot results in xenografts showed that the expression of p-p70S6K in rapamycin + p70S6K siRNA group was lower than that in rapamycin or p70S6K siRNA group (Figures 5(c) and 5(d)), which maybe explain the reason that p70S6K siRNA enhanced the inhibition effects of rapamycin on tumor growth in vivo. This evidence concerns the gene RPS6KB1 and neoplasm.