KIT and neoplasm: In the past decade, there was a significant advance in the understanding ofthe molecular alterations of this neoplasia, and it is currently own that the KITgene is present in 80-90% of the cases, with mutations of exon 11 of the KIT genebeing observed in two-thirds of the cases and of exon 9 in 8-10% of the cases, thelatter being associated with tumors of the small intestine and colon .4