Pyrimidylaminobenzamide derivatives for use in the treatment of a myeloproliferative disease induced by TEL-PDGFR-beta

Pyrimidylaminobenzamide derivative called 4-methyl-3 - [[4- (3-pyridinyl) -2-pyrimidinyl] amino] -N- [5- (4-methyl-1H- imidazol-1-yl) -3- (trifluoromethyl ) phenyl] benzamide of formula (II): formula ** ** or an N-oxide or a pharmaceutically acceptable salt thereof, for use in a method for the treatment of a myeloproliferative disease induced by TEL-PDGFRb.