KRAS and neoplasm: In total, 2 of the 96 tumour pairs analysed (2.1%) showed tumour-specific copy number increases (Figure 6), one (study code 1264, wt K-Ras) with 4 tumour copies of K-Ras and the other (study code 1233, wt K-Ras) with 27 copies of the K-Ras gene.