Question

What are malignant tumors?

Answer 1

A disease in which abnormal cells divide uncontrollably and destroy body tissue.

Answer 2

any abnormal growth due to uncontrolled cell division secondary to unbalanced apoptotic an mitotic regulations is considered a tumor; when this grows enough to "break" the basement membrane then it is considered malignant.

Answer 3

This should help you:
http://www.dictionary.com/browse/malignant-tumor

Answer 4

.A tumor that invades surrounding tissues, is usually capable of producing metastases, may recur after attempted removal, and is likely to cause death unless adequately treated.