We report a novel KIT gain-of-function mutation with S628N substitution (exon 13) and show that it is sensitive to imatinib in vitro....We tested 2 KIT inhibitors: imatinib and dasatinib. Both inhibitors abolished the autophosphorylation of KIT S628N at a moderate concentration...We concluded that KIT S628N mutant is sensitive to imatinib and dasatinib.