Pathology While advancing there is increased chance of developing cancers. Tumorigenesis in aging is due to: A Telomerase reactivation B Telomerase inactivation C Increased apoptosis D Suppression of proto-oncogenes 💡 Explanation While advancing there is increased chance of developing cancers. Tumorigenesis in aging is due to: ✓ Correct Answer: A. Telomerase reactivation