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亚临床转移灶的一般理解为癌细胞播散并存活在各组织器官、血液、骨髓及淋巴管中，但尚未形成明显的转移结节，临床上难以用常规检查方法发现，患者亦无临床症状，也可称之为微小癌转移灶。约１／３的大肠癌患者在接受根治性手术后出现肝转移，这说明在首次诊治时已有癌细胞扩
The general understanding of subclinical metastases is that cancer cells are disseminated and survive in various tissues, organs, blood, bone marrow, and lymphatic vessels, but no significant metastatic nodules have been formed. Clinically it is difficult to detect them by routine examination methods, and patients have no clinical symptoms. It can also be called a tiny cancer metastasis. About 1/3 of patients with colorectal cancer have liver metastases after undergoing radical surgery, which indicates that cancer cells have spread during the first diagnosis and treatment.