How do oncogenes function in cellular behavior?

Oncogenes are mutated forms of normal genes, known as proto-oncogenes, that typically play a role in promoting cell division and growth. When these genes are activated through mutations or overexpression, they can lead to uncontrolled cell proliferation. This abnormal increase in cell division contributes to the formation and progression of tumors, effectively altering the normal regulatory mechanisms of the cell cycle.

In the context of cancer, the role of oncogenes is crucial as they can override the signals that normally limit cell growth and division. This unchecked cellular behavior is a hallmark of cancer, where the regulatory balance between cell growth and inhibition is disrupted. Therefore, the promotion of cell division by oncogenes is a fundamental aspect of how they influence cellular behavior and contribute to the pathophysiology of cancer.