目前为止，科学家普遍认为癌细胞必须永久性的由静止性的上皮细胞转变成迁移性的间充质细胞后才能够转移。

Until now, scientists have believed that cancer cells must transform permanently from stationary epithelial cells into migratory mesenchymal cells in order to metastasize.

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已知上皮向间充质转变（EMT）是肿瘤细胞迁移、浸润及转移过程中的重要调控事件。

The Epithelial-mesenchymal transition (EMT) is an important cellular program during tumor migration, invasion and metastasis.

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