Washington, July 11 - Elevated insulin levels in the blood seem to raise the risk of breast cancer in post-menopausal women, according to a new study.

Increased breast cancer risk for post-menopausal women has previously been linked to obesity and diabetes. Both conditions involve insulin resistance, which causes increases in circulating levels of insulin.

Since insulin is known to promote cell division and enhance breast tumour growth in animal models, Einstein College of Medicine scientists reasoned that relatively high insulin levels may contribute to breast cancer risk in women.

'Up to now, only a few studies have directly investigated whether insulin levels are associated with breast cancer risk, and those studies have yielded conflicting results,' says Geoffrey Geoffrey Kabat, senior epidemiologist at Einstein and the study's co-author.

'Those other studies were based on just a single baseline measurement of insulin, while our study involved analysing repeated measurements of insulin taken over several years - which provides a more accurate picture of the possible association between insulin levels and breast cancer risk.