Table 1.

Distribution of KRAS mutations in codons 12 and 13 of exon 2 (N = 52).

Codon	Base	Wild Type	Mutant	AA Change	KRAS Mutations n (%)
12	1st	G	A	G12S	1 (1.9)
			T	G12C	3 (5.8)
	2nd	G	A	G12D	16 (30.8)
			T	G12V	8 (15.4)
			C	G12A	4 (7.7)
	3rd	T	A	No change	1 (1.9)
			C	No change	1 (1.9)
13	2nd 3rd	G	A	G13D	16 (30.8)
		C	T	No change	2 (3.8)

G: glycine; S: serine; C: cycteine; D: aspartic acid; V: valine; A: alanine.