12. What is a metastasis in cancer development?
(A) The beginning of a cancer development.
(B) The growing stage of a tumor.
(C)It is the end stage of begin tumor.
(D) It is the spreading stage beyond the original site of cancer cells.
(E) It is the stage of malignant tumor.
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E轉移期不等於整個惡性腫瘤階段 應該說惡...
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