MedicalTerminology DB
General Medical Terms Cancer & Oncology

proliferative index

Meaning of proliferative index: A measure of the number of cells in a tumor that are dividing (proliferating).

Definition of proliferative index

A measure of the number of cells in a tumor that are dividing (proliferating). May be used with the S-phase fraction to give a more complete understanding of how fast a tumor is growing.

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.