A matched study of more than 30,000 appendicitis patients reports that appendectomy is tied to a sharply lower later colorectal cancer risk than antibiotics alone. The analysis finds a 58% lower relative risk of a later colorectal cancer diagnosis for patients treated surgically, reinforcing that “initial treatment” may have downstream oncology consequences. For biotech and clinical researchers, the result intensifies interest in mechanisms linking infection/inflammation and cancer risk, and it may influence future comparative-effectiveness designs for gastrointestinal infectious syndromes treated with drugs versus procedures.