The present invention relates to a pharmaceutical composition including Lipiodol and a molecule with anti-tumor activity and secondarily a hydroxyethyl starch. The present invention also relates to the use of the compositions according to the invention for treating cancer. According to one embodiment, the pharmaceutical composition according to the invention has between 0.004% and 0.2% by weight of idarubicin, between 0.38% and 2.25% by weight of hydroxyethyl starch and secondarily between 60% and 68% by weight of Lipiodol, and water for injection (or even physiological saline) in a quantity sufficient (q.s.) for 100%.