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The research has been presented at a Cancer Symposium in the US.
It found that after several years follow up the drug is better than others in stopping tumours from returning in post-menopausal women.
Professor John Boyages from the New South Wales Breast Cancer Institute says its significant research.
"Every little bit helps in breast cancer - whether it's early detection from screening, good surgery and radiotherapy and then good hormone therapy, particularly for older women who've gone through the menopause," he said. - ABC Australia Copyright