In the study of cancer, researchers have used different types of cells, different environmental conditions, and different experimental designs. However, all researchers have arrived at the same conclusion. Which conclusion is that?

Contact inhibition normally causes cells to stop dividing when they touch neighboring cells. Cancer cells often keep dividing despite contact, so they form crowded masses instead of stopping. Therefore, the shared conclusion is that cancer cells lack contact inhibition; choice C is correct.

AI-written and checked against the verified answer.