Abstract
Malignant tumors still threatens the human's health seriously. Metastasis and recurrence lead to the failure of treatment, and multidrug resistance adds the difficulty of therapy of to malignant tumors. But the mechanism is yet unclear. Nowadays, it is found that there's a small group of cells with selfrenewal and indefinite potency in the tumors, and they are the sources of metastasis and recurrence. This small group of cells is called cancer stem cells. Subsequently, the cancer stem ceils were separated and determined from hematological system tumor and solid tumor respectively. The cognitions for metastasis and recurrence and muhidrug resistance of malignant tumor have changed with proposal and verification of the cancer stem cell theory, which provides a new clue to the treatment of tumor and prevention for the metastasis and recurrence. Key words: tumor; cancer stem cells; stem cells
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