The aim of this study is to evaluate the antitumor activity and potential adverse effects of the combination celecoxib plus carboplatin in patients with recurrent, heavily pre-treated Ovarian Cancer (OC). The potential changes induced by the experimental combination on angiogenesis-related serum markers and quality of life measures will be also evaluated.The main objective is to evaluate the response rate. Secondary objectives are the following:toxicity;progression free survival;overall survival;duration of response;quality of life;modulation of angiogenesis-related molecules.