Small molecule TGF‐β enhancers, which potentiate TGF‐β growth inhibition by enhancing TβR‐I–TβR‐II‐mediated canonical signaling and thus activating TβR‐V‐mediated tumor suppressor signaling cascade (TβR‐V/IRS‐2/PP1/pRb), could be used to prevent and treat carcinoma. This evidence concerns the gene RB1 and carcinoma.