KIT and melanoma: Analysis of mutations of skin melanoma in KIT exons indicated that, similar to GIST, exon 11 is the most frequently involved one (44.7%) followed by exon 9 (21.1%), exon 17 (15.8%) and exon 13 (13.2%) and exon 17 (13.2%) (Table 3) There were no significant differences between the UV- and non-UV melanomas in case of exon-9 and exon-11 involvements but exon 18 mutations found in UV melanoma exclusively and exon 13 and 17 mutations were more prevalent in non-UV melanomas.