3-(1-{3-[5-(1-methyl-piperidin-4-ylmethoxy)-pyrimidin-2-yl]-benzyl}-6-oxo-1,6-dihydro-pyridazin-3-yl)-benzonitrile or a pharmaceutically acceptable salt and/or solvate thereof for the use for the treatment of renal cell carcinoma (RCC).本發明係關於用於治療腎細胞惡性腫瘤(RCC)之3-(1-{3-[5-(1-甲基-哌啶-4-基甲氧基)-嘧啶-2-基]-苄基}-6-側氧基-1,6-二氫嗒-3-基)-苯甲腈或其藥學可接受之鹽及/或溶劑化物。