Luteinising hormone releasing hormone (LHRH) agonists are currently undergoing clinical trials in the treatment of advanced breast cancer in pre-menopausal women. Clinical responses are attributed to the suppression of the pituitary-ovarian axis, with a reduction in circulating levels of gonadal steroids similar to that produced by castration. In the present case report, we report a partial response to a LHRH analogue in a post-menopausal woman refractory to other endocrine treatments. This response cannot be explained with a chemical castration and confirms the possible direct anti-tumor effect of Zoladex.