The invention relates to the use of (R)—S-cyclopropyl-S-(4-{[4-{[(1R,2R)-2-hydroxy-1-methylpropyl]oxy}-5-(trifluoromethyl)pyrimidin-2-yl]amino}phenyl)sulphoximide and/or (S)—S-cyclopropyl-S-(4-{[4-{[(1R,2R)-2-hydroxy-1-methylpropyl]oxy}-5-(trifluoromethyl)pyrimidin-2-yl]amino}phenyl)sulphoximide for the treatment of specific tumours.USO DE (RS)-S-CICLOPROPIL-S-(4-{[4-{[(1R,2R)-2-HIDROXI-1-METILPROPIL]OXI}-5-(TRIFLUOROMETIL)PIRIMIDIN-2-IL]AMINO}FENIL)SULFOXIMIDA PARA PREPARAR UN MEDICAMENTO ÚTIL PARA EL TRATAMIENTO DE CÁNCER DE TIROIDES, MESOTELIOMAS, CARCINOMA DE CÉLULAS ESCAMOSAS DEL ESÓFAGO O CARCINOMA COLANGIOCELULAR.