Written By: Muskan Gupta | Published : February 5, 2026 4:25 PM IST
Medically Verified By: Dr. Sreevalli A
Appendiceal carcinoma stands as an uncommon cancer which affects less than one percent of all gastrointestinal cancers. The disease affects both men and women equally while it primarily affects people who are 50 years old and older. Medical professionals usually discover this tumour when they conduct imaging tests or when they examine appendectomy samples from patients who underwent surgery for appendicitis. Patients may present with two symptoms which include a discernible tumour and stomach swelling. The appendix appears as a stretched organ which can reach a stage where it looks like it has fused with the intestinal parts which include the ileum and cecum.
In an exclusive chat with Dr Sreevalli A, Consultant- Medical Oncology, Manipal Hospital Kanakapura Road, "The tumour exists as an uncommon medical condition which is becoming more common. The rate of occurrence in the 20th century started at 0.12 to 2.6 cases per million people but it reached 0.97 cases per 100000 people in the early 2000s. The research article which appeared in Annals of Internal Medicine reports that appendix cancer cases have grown rapidly since the 1970s among people born after that decade. The younger generation shows a three to four times higher incidence rate than people who were born during the 1940s. The numbers remain low yet the speed of increase shows a remarkable pattern."
The rising incidence of the disease brings forth scientific inquiries regarding current trends in risk factors. Researchers still do not understand the precise origins of the disease although they suspect that multiple risk factors contribute to its development through three major factors. People who have genetic predispositions to cancer develop this condition through their hereditary cancer syndromes which include Lynch syndrome and FAP.
People who suffer from Crohn's disease or untreated infections experience chronic digestive tract inflammation which results in cellular mutations in their appendix lining. People who smoke alcohol and maintain an obese body weight while consuming processed foods with minimal fibre intake create conditions that support tumor development. In some, long term use of acid reducing medications and previous history of gastrointestinal cancers may also increase risk.
Appendix carcinomas can be adenocarcinomas, pseudomyxoma peritonei, neuroendocrine tumors or lymphomas. The current World Health Organization classifies appendix adenocarcinomas as mucinous or nonmucinous. Nonmucinous appendix adenocarcinoma histologically resemble conventional colorectal adenocarcinomas and have a worse prognosis than their mucinous counterpart.
The management of appendix carcinoma depends upon histologic type, tumor grade and tumor stage. Treatment is multimodal- surgery, HIPEC- Hyperthermic intraperitoneal chemotherapy and systemic therapy-chemotherapy, immunotherapy and targeted therapy.
ASCO abstract 2024 highlighted that early onset appendiceal adenocarcinoma (EOAA) has a median overall survival (OS) of about 3yrs in young patients. Genetic mutations in TP53 and GNAS are identified as predictors of survival in these cases.
Histologic grade is the most significant prognostic factor for patients with appendix adenocarcinomas. The reported overall 5-year survival rates range from 64 91 %, 38 63 %, and 22 32 % for patients with G1, G2, and G3 peritoneal disease, respectively.
The rarity of appendix carcinoma, heterogeneity in biologic behaviour, and frequently changing nomenclature, have contributed to a lack of robust data on patient outcome. Once considered extremely rare, now is on a rapid surge in younger population, especially millennials and hence its if utmost importance to understand.
Disclaimer: Dear readers, this article provides general information and advice only. It is not at all professional medical advice. Therefore, always consult your doctor or a healthcare specialist for more information. TheHealthSite.com does not claim responsibility for this information.
