A 49-year-old patient is diagnosed with ovarian cancer. What is a characteristic of malignant cells that differentiates them from normal body cells?
A) Cancerous cells do not require an energy source in order to proliferate.
B) Cancerous cells grow in an uncontrollable fashion.
C) Cancerous cells have a theoretically infinite lifespan.
D) Cancerous cells are not responsive to the presence of drugs.
B
Feedback:
Malignant cells have lost the normal genetic regulation that controls cell growth, invading normal tissues and taking blood and nutrients away from these tissues. They grow in an uncontrolled fashion without regard to growth regulation signals (e.g., contact with other cells) that stop the growth of normal cells. Cancerous cells, like all cells, have a finite lifespan and need energy. Cancerous cells are responsive to drugs; this is the rationale for treatment with antineoplastics.
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