Prolactin is a natural hormone in the body that plays a role in breast growth and the production of milk during breastfeeding. It is mainly produced in the pituitary gland (a small gland near the brain).
Women with higher blood levels of prolactin may have a higher risk of breast cancer than women with lower levels [211-212].
Measures of prolactin blood levels may one day help estimate breast cancer risk.
For a summary of research studies on prolactin and breast cancer risk, visit the Breast Cancer Research Studies section.