The present invention relates to the use of masitinib or a pharmaceutically acceptable salt thereof, and in particular of masitinib mesylate, for the preparation of a medicament for the treatment of GIST, to the use of this therapy for the treatment of GIST, and a method of treating mammals, including humans, suffering from GIST by administering to said mammal in need of such treatment an effective dose of masitinib, and in particular masitinib mesylate.
