12. Which one best define malignant tumors?
(A)The tumors that are abnormally growing within normal tissue.
(B)Malignant tumors only stay in the original site.
(C)Malignant tumors could spread into neighboring tissues and replace normal tissues.
(D)Malignant tumors are usually at the status of metastasis.
(E)Malignant tumors are equivalent to benign tumors.
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