Expert consensus on the diagnosis and treatment of colorectal cancer peritoneal metastasis (2025 edition)

Colorectal cancer (CRC) is one of the most common malignant tumors in China, ranking second in morbidity and fourth in mortality. Metastasis and recurrence are the leading causes of patient death, and the peritoneum is a frequent site of metastasis in CRC, second only to liver and lung metastases. However, the prognosis of peritoneal metastasis is much worse than hepatic and pulmonary metastasis. CRC peritoneal metastasis is challenging hard to diagnose early, presents with severe symptoms, and has a poor prognosis. It is crucial to emphasize standardized diagnosis and treatment for CRC peritoneal metastasis in order to improve outcome and enhance quality of life of patients. The Colorectal Cancer Professional Committee of Chinese Medical Doctor Association, based on evidence‑based medical evidence, has revised the "Chinese expert consensus on the diagnosis and treatment of colorectal cancer peritoneal metastasis (2022 edition)" and reached consensus on the definition, diagnosis, treatment, and prevention of CRC peritoneal metastasis, with the aim of guiding and standardizing the diagnosis and treatment of CRC peritoneal metastasis, developing reasonable and effective comprehensive treatment plans, prolonging survival time and improving quality of life for CRC peritoneal metastasis patients, and raising the overall level of diagnosis and treatment for CRC in China.