The Who, What, Where, When and Sometimes, Why.

IGF-1 Hormone Levels

Insulin-like growth factor 1 (IGF-1) is a natural hormone that plays a role in growth and development.

Studies have found higher levels of IGF-1 in the blood may increase the risk of breast cancer [237-240,605].

Measures of blood levels of IGF-1 may one day help estimate breast cancer risk.

For a summary of research studies on IGF-1 and breast cancer, visit the Breast Cancer Research Studies section.


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