Figure 1

Representative sequence chromatogram. (a) Sequence chromatogram from a case of gastric cancer with H1047R (A3140G) mutation within exon 20 of PIK3CA. Site of mutation is denoted by the red arrow. (b) Sequence chromatogram of the corresponding normal mucosa from the same case showing the absence of mutation (red arrow), and thus confirming the somatic nature of the mutation.