Objective To investigate the K-ras mutation pattern in six pancreatic cancer cell lines from Chinese patients. Methods All six cell lines were analyzed for mutations in exon 1 of the K-ras gene by polymerase chain reaction (PCR) and direct sequencing.Results All 6 pancreatic cancer cell lines had GGT→GTT mutations at K-ras codon 12 but no mutations at codon 13.Conclusion The unique GGT→GTT mutation at codon 12 plays a potential role in the carcinogenesis of pancreatic cancers in Chinese. Objective To investigate the K-ras mutation pattern in six pancreatic cancer cell lines from Chinese patients. Methods All six cell lines were analyzed for mutations in exon 1 of the K-ras gene by polymerase chain reaction (PCR) and direct sequencing. Results All 6 pancreatic cancer cell lines had GGT → GTT mutations at K-ras codon 12 but no mutations at codon 13. Conlusion The unique GGT → GTT mutation at codon 12 plays a potential role in the carcinogenesis of pancreatic cancers in Chinese.