YY1 and neoplasm: To verify the pro‐carcinogenic YY1/KTN1 axis in vivo, tumor‐bearing mice were injected with 5′ cholesterol‐ and 2′ methoxyethyl‐modified YY1 siRNA oligos (10 nmol each) twice every week, and tumor volumes were recorded from 24 to 55 days after the injections.