
AI-generated summary
In addition to appendectomy surgery, some patients with acute appendicitis (commonly known as appendicitis) can also be treated with antibiotics. In the past, the main treatment was surgery, but in recent years, research has explored the feasibility of antibiotic therapy. This study compared the risk of subsequent colorectal cancer between the two treatment methods.
2026/09/29 11:34
Diagram of appendix inflammation. Studies have found differences in the risk of subsequent colorectal cancer among patients with appendicitis who receive surgery or antibiotic treatment. (Image taken from Wikimedia Commons)
[Compiled by Chen Chengliang/Comprehensive Report] In addition to appendectomy surgery, some patients with acute appendicitis (commonly known as appendicitis) can also be treated with antibiotics. A large retrospective matched study of more than 30,000 patients found that those who underwent appendectomy had a 58% lower relative risk of subsequent diagnosis of colorectal cancer than those who received antibiotics alone.
The medical news website "Medical Xpress" published research information provided by the American College of Surgeons (ACS) on the 25th. This research was presented at the ACS 2026 Annual Clinical Meeting. The research team used a global database covering 168 medical institutions to compare 15,616 people who underwent appendectomies with 15,295 people who received antibiotics, and analyzed the subsequent colorectal cancer diagnosis in the two groups.
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The analysis showed that after excluding those who had been diagnosed with colorectal cancer before the study results, a total of 0.7% of the surgery group was subsequently diagnosed with colorectal cancer, and 1.7% of the antibiotic group. After conversion, the subsequent relative cancer risk of the surgery group was 58% lower.
Why is the risk of cancer lower? The study proposes 3 possibilities
Valentine Nfonsam, senior author of the study and professor of surgery at Morehouse School of Medicine in the United States, said that the exact mechanism between the two is still unclear, and may include the opportunity for pathological examination after appendectomy to discover potential lesions, removal of tissue that may continue to cause inflammation, and the impact of appendectomy on intestinal flora and the local immune environment.
Studies have also pointed out that acute appendicitis itself may be an early manifestation of undiagnosed colorectal cancer. For example, a right large intestinal tumor blocking appendiceal drainage may first present itself as acute appendicitis. Therefore, the study results cannot be interpreted to mean that all patients with appendicitis should undergo surgery to prevent cancer; patient treatment must still be evaluated based on age, family history, genetic predisposition, and other colorectal cancer risk factors.
This study is currently a research abstract presented at the ACS 2026 Annual Clinical Meeting Scientific Forum. It has been reviewed and selected by the conference, but has not yet been officially published in a peer-reviewed journal.
AI outlook — possibilities, not facts
Future appendicitis treatment guidelines may factor in long-term cancer risk into decision-making
Likely · Within months

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