IGF-1 Hormone Levels
Insulin-like growth factor 1 (IGF-1) is a natural hormone that plays a role in growth and development.
Studies show women with higher levels of IGF-1 in their blood may have a higher risk of breast cancer than women with lower levels of IGF-1 [257-260].
Measures of blood levels of IGF-1 may one day help estimate breast cancer risk.
For a summary of research studies on IGF-1 hormone levels and breast cancer, visit the Breast Cancer Research Studies section.
Learn about other factors linked to the risk of breast cancer.