MAOA, or monoamine oxidase A, is an enzyme encoded by the MAOA gene. It plays a crucial role in the breakdown of various neurotransmitters, including serotonin, dopamine, and norepinephrine. This enzyme is essential for maintaining the balance and stability of neurotransmitter levels in the brain. MAOA is a key enzyme involved in neurotransmitter regulation, behavioral control, and stress response. Its role in cancer and the potential use of MAOIs in cancer treatment highlight its importance in both neurological and oncological contexts.