2[Problem] There have been demands for a therapeutic method that increases the medicinal effects of taxane based antitumor agents on various tumors. [Solution] As a result of researches for a method for enhancing the antitumor effects of taxane based antitumor agents the inventors have achieved the present invention by confirming that a composition for the treatment of cancer said composition containing N [(2E) 3 (4 chlorophenyl) 2 propenoyl] N [2 oxo 2 (4 {[6 (trifluoromethyl)pyrimidin 4 yl]oxy}pyperidin 1 yl)ethyl] 3 pyridin 2 yl L alaninamide (FK330) or a salt thereof as an active ingredient enhances the antitumor effects of taxane based antitumor agents. Namely the present invention relates to a composition for the treatment of cancer which contains FK330 or a salt thereof as an active ingredient and which is for administration in combination with one or more antitumor agents that are selected from among taxane based antitumor agents.
