A compound 3 - (1 - {3 - [5 - (1 - methyl - 4 - ilmetoxi piperidin - pyrimidin-2-yl) - benzyl}] - 2 - il - 6 - oxo - 1.6 - dihydro - pyridazin-3 3 - il) benzonitrile and / or its Salt or solvate thereof for the treatment of renal cell carcinoma (RCC).UN COMPUESTO 3-(1-{3-[5-(1-METIL-PIPERIDIN-4-ILMETOXI)-PIRIMIDIN-2-IL]-BENCIL}-6-OXO-1,6-DIHIDRO-PIRIDAZIN-3-IL)-BENZONITRILO O SU SAL Y/O SOLVATO DEL MISMO PARA EL TRATAMIENTO DE CARCINOMA DE CÉLULAS RENALES (RCC).