Evaluate the Efficacy of Selenium for the Prevention of Chemotherapy-induced Mucositis During Autologous Stem Cell Transplantation.

Chemotherapy-induced mucositis is an important complication after autologous stem cell transplantation. It is mainly responsible for pain and dysphagia requiring opioids and artificial nutrition. It can also induce infectious complications. A few medication has demonstrated efficacy in this setting. It has been suggested that selenium can reduce the intensity of mucositis due to its antioxydant activity. The investigators therefore perform a randomized study to confirm this preliminary data.