Prolactin is a hormone mainly produced in the pituitary gland (a small gland near the brain). It plays a role in breast growth and the production of milk during breastfeeding.
Women with higher blood levels of prolactin have a slightly higher risk of breast cancer than women with lower levels [290-291].
Measures of prolactin blood levels may one day help estimate breast cancer risk [61-62].
For a summary of research studies on prolactin and breast cancer risk, visit the Breast Cancer Research Studies section.