The invention relates to a combined preparation of xanthanodien and either or both of a taxane, preferably paclitaxel (Taxol®) and a platinum-containing anti-cancer drug, preferably cisplatin, for the simultaneous, separate or sequential use in therapy, preferably in the treatment of cancer and particularly ovarian cancer. The invention further comprises the use of such a combined preparation in the treatment of cancer, and a method of treating cancer with such a combined preparation.