Abstract:Abstract: p53 is one of the most important tumor suppressor genes, which is mutated in more than 50% human cancers. The most common mutations in the p53 gene are single nucleotide point mutations, which leads to an amino acid replacement resulting in loss of DNA-binding and transactivating activities. In this study, stably-expressing p53-R273H in H1299 human lung cancer cells promoted cell migration and concomitant of down-regulated E-cadherin expression. Immunofluorescent staining showed reduced E-cadherin at cell-cell junction. Together, these data suggest that mutant p53-R273H protein acquires a new activity in down-regulating E-cadherin expression and promoting cancer cell migration.