Cancer is best described as a rapid growth of cells within an enclosed membrane. tumors that cause death. an infectious disease that is often fatal. an abnormal and uncontrolled multiplication of cells.

Cancer is an abnormal and uncontrolled multiplication of cells.  
Cancer also involves abnormal cell growth with the potential to spread to other parts of the body via blood and to form metastasis. Cancer cells avoid apoptosis (programmed cell death), have the limitless number of cell divisions and promote blood vessel construction. There are more than 100 types of cancers that affect humans with different signs and symptoms and with many different causes.