In SCLC cell lines with higher p-4E-BP1 expression, RAD001 at very low concentration (0.001 nM–1 nM) was able to moderately inhibit SCLC cell growth by 12.8%–36.1%, whereas the growth inhibition was not enhanced as RAD001 concentrations’ increase unless RAD001 reached very high concentrations (100 μM). The gene discussed is EIF4EBP1; the disease is small cell lung carcinoma.