Glossary Term:

Title

oncogenes

Phonetic

<b>on</b>-kuh-jeenz

Description

mutated (changed) forms of genes that cause cells to grow and divide. Oncogenes are related to normal genes called proto-oncogenes that control normal cell growth. But oncogenes may undergo changes that activate them, resulting in cells growing out of control and becoming cancerous. See also genes, tumors. Compare to tumor suppressor genes.