PROBLEM TO BE SOLVED: To provide a drug for cancer treatment that reliably inhibits the proliferation of cancer and has little toxicity.SOLUTION: A therapeutic agent for prostate cancer includes: a compound composed of a tyrosine derivative represented by the following formula (I) or pharmaceutically acceptable salt thereof, where R1 represents a C1-6 alkyl group.COPYRIGHT: (C)2015,JPO&INPIT【課題】癌の増殖を確実に抑制し、かつ毒性の少ない癌治療薬の提供。【解決手段】下記式(I)で示されるチロシン誘導体からなる化合物はその薬学的に許容可能な塩を含む、前立腺癌治療剤。[式中、R1は、C1~6アルキル基を表す。]【選択図】図1