肿瘤的转移是恶性肿瘤重要的生物学特征之一。国内外大量研究证明:肿瘤的转移不是随机性,而是有选择性,具有嗜器官性[1]。“土壤与种子”学说认为嗜器官性转移的原因在于不同器官的生长环境仅适合特异性的肿瘤类型生长;而“归巢”理论认为不同器官具有通过分泌趋化因子捕获或吸 Tumor metastasis is one of the important biological features of malignant tumors. A large number of domestic and foreign studies have shown that: the transfer of cancer is not random, but selective, with the role of organ [1]. The theory of “soil and seed” holds that the reason for organ metastasis of organ is that the growth environment of different organs is only suitable for the growth of specific tumor types. Homing theory holds that different organs have the function of capturing or absorbing by chemotactic factor