Meaning of proto-oncogene: A gene involved in normal cell growth.
Definition of proto-oncogene
A gene involved in normal cell growth. Mutations (changes) in a proto-oncogene may cause it to become an oncogene, which can cause the growth of cancer cells.
Written and maintained by James Murray· Last updated July 21, 2026 Educational reference, not medical advice. Read the limitations.
For learning, not diagnosis. This glossary provides general educational information and is not a substitute for advice from a qualified healthcare professional. If you may be experiencing a medical emergency, contact local emergency services.