What is a key feature of cancer cells compared to normal cells?

Cancer cells exhibit a key feature known as loss of contact inhibition, which distinguishes them from normal cells. In normal cells, contact inhibition is a regulatory mechanism that halts cell growth and division when cells come into close contact with one another. This is crucial for maintaining proper tissue architecture and preventing overgrowth.

In contrast, cancer cells bypass this mechanism, allowing them to continue dividing and proliferating even when they are in close proximity to other cells. This uncontrolled growth is a hallmark of cancer, leading to the formation of tumors and potentially metastasizing to other parts of the body.

This characteristic not only contributes to the aggressive nature of cancer but also is a vital aspect of why tumor cells can grow and invade surrounding tissues unchecked, contrasting sharply with normal cells that maintain a balance in growth and density.