Abnormal cancer cells that become invasive enough to impair the functions or one or more organs form this. An individual with a malignant tumor is said to have cancer. Abnormalities in cells of malignant tumors: they may have unusual number of chromo

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1. Abnormal cancer cells that become invasive enough to impair the functions or one or more organs form this. An individual with a malignant tumor is said to have cancer. Abnormalities in cells of malignant tumors: they may have unusual number of chromo