原发性多发性癌是一常见现象,本文报导三例与胃肠道有关的多发性癌。复习了有关文献,并对多发癌的概念、发生率、原因和处理进行了讨论。一经做出恶性疾病的诊断,就要考虑到该器官还会有潜在恶性疾病的可能性。这就要求我们在癌的处理上必须经常警惕存在着同步性和异步性损害。以保证对多发癌能做出早期诊断和适当的治疗。 Primary multiple cancer is a common phenomenon. This article reports three cases of multiple cancers associated with the gastrointestinal tract. We reviewed the relevant literature and discussed the concept, incidence, causes and treatment of multiple cancers. Once a diagnosis of a malignant disease has been made, it is necessary to take into account the possibility that the organ will also have potential malignant disease. This requires that we must always be vigilant in the treatment of cancer with synchronous and asynchronous damage. To ensure that multiple cancers can make early diagnosis and appropriate treatment.