来源不明的转移癌(MUO)是经病理或细胞学检查证实和全面检查后仍不能确定原发病灶的肿瘤。共分两大类:限于淋巴结转移和内脏器官转移者。颈部、腋窝、腹股沟淋巴结转移癌预后较好,其它部位淋巴结转移癌预后较差,内脏器官转移癌预后最差。 一、转移癌的生物学 肿瘤细胞发生转移时首先要穿透基底膜。基底膜 Unknown metastatic cancer (MUO) is a tumor that cannot be identified after the pathological or cytological examination has been confirmed and after a complete examination. There are two major categories: limited to lymph node metastases and visceral organ metastases. The prognosis of metastatic cervical, axillary, and inguinal lymph nodes was good. The prognosis of lymph node metastases in other sites was poor. The prognosis of metastatic cancer in internal organs was the worst. First, the biology of metastatic cancer When tumor cells metastasize, they must first penetrate the basement membrane. Basement membrane