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New research shows no link between aromatase inhibitors and cardiovascular problems
Date:4/17/2008

Berlin, Germany: New evidence has emerged that, contrary to some current fears, aromatase inhibitors (AIs) are not associated with an increased risk of heart problems in women who take them to prevent their breast cancer recurring.

In a study presented today (Thursday) at the 6th European Breast Cancer Conference (EBCC-6) in Berlin, the researcher, Dr Alain Monnier, said that this was important and reassuring news for women.

AIs, such as letrozole, anastrozole and exemestane, work by causing severe oestrogen deprivation and, increasingly, they are being prescribed for women whose tumours are positive for the oestrogen receptor (ER+). Several trials have shown that AIs are more effective than tamoxifen the gold standard for ER+ tumours; however, concerns have been raised about their effects on the cardiovascular system. In particular, the consequences of oestrogen deprivation can be atherosclerosis, high levels of lipids (fats) in the blood (hyperlipidaemia), high cholesterol levels (hypercholesterolaemia) and consequent heart problems.

Dr Monnier, a medical oncologist and head of the medical oncology department at the Centre Hospitalier de Belfort-Montbliard (Belfort-Montbliard, France), looked at the results from several trials of AIs in order to compare the effects of AIs versus tamoxifen and placebos on lipid levels and heart problems.

One of the problems with obtaining clear evidence about the impact of AIs on cardiovascular health is that tamoxifen has cardioprotective effects, explained Dr Monnier. Tamoxifen is an anti-oestrogen with known lipid-lowering properties; it has been reported to reduce coronary plaques, C-reactive protein, and is associated with decreases in heart problems such as myocardial infarction. This makes comparisons between AIs and tamoxifen difficult to interpret, and so comparisons between AIs and placebos might indicate better the impact of AIs on cardiovascular health.

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Contact: Emma Mason
wordmason@mac.com
ECCO-the European CanCer Organisation
Source:Eurekalert

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