Sequencing analyses of p53 gene mutations
| Tumour region | Exon 5 | Exon 7 |
| T1 | GCC→GTC at codon 129 | GGC→GTC at codon 245 |
| T2 | Wild-type | GGC→GTC at codon 245 |
| T3 | Wild-type | GGC→GTC at codon 245 |
| T4 | Wild-type | GGC→GTC at codon 245 |
T1, anal side of the duodenal tumour; T2, centre of the duodenal tumour; T3, pyloric ring; T4, tumour of the stomach.