癌細胞從原處走到另一地方(轉移，Metastasis)，均需透過血液或淋巴系統作交通渠道。1010Please respect copyright.ＰＥＮＡＮＡkCJw2dwfPD
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有不少癌細胞轉移到另一器官後會呈「休養」狀態，不迅速繁殖，而是長期潛伏在另一器官內。1010Please respect copyright.ＰＥＮＡＮＡRZ3TAdHGhi
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因此就算沒能檢測得到循環腫瘤細胞的存在，也不百分百等於未來不會出現癌細胞轉移事件。1010Please respect copyright.ＰＥＮＡＮＡUnEJT43WYk
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(圖2)科學家分別把人類及老鼠的癌細胞注入到老鼠模型作研究，發現癌細胞發生轉移的機率是與目的地所含的NK cell數量有關係。1010Please respect copyright.ＰＥＮＡＮＡtLSZhN40L2
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目的地所含的NK cell越多，該地方出現癌細胞轉移的機率亦會越低。1010Please respect copyright.ＰＥＮＡＮＡLuwxl3ekFV
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之所以會出現這情況，除了是NK cell殺死癌細胞這可能性之外，科學家發現NK cell會釋放interferon-γ (IFN-γ)的物質，誘使癌細胞進入休養狀態，不進行自我繁殖。1010Please respect copyright.ＰＥＮＡＮＡ7n38sznsTI
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(圖3)奈何，至少在肝臟裡頭，一種名為Hepatic stellate cells會釋出CXCL12物質，CXCL12會阻礙NK cell的生長速度。1010Please respect copyright.ＰＥＮＡＮＡvMjocxaDQ3
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久而久之，便再也沒有足夠的NK cell抑制癌細胞的生長，而當潛伏在另一器官的癌細胞快速繁殖之時，這亦是轉移(Metastasis)被鑑定發生之時。1010Please respect copyright.ＰＥＮＡＮＡydnAVQcJec
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對此，研發藥物或療程確保NK cell長期處於足夠水平，或許是一道避免癌細胞發生轉移的大方向。1010Please respect copyright.ＰＥＮＡＮＡ7Z8cL4ZCtH
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