of Iran. Background: There has been extensive change in classification and pathogenesis of
serrated polyps of the colon during the last 10 years. The new classification is mostly based
on the knowledge of the molecular pathogenesis and the rate of progression to colorectal
cancer in these types of polyps. One of the most common and early lesions in molecular
pathogenesis of serrated colorectal cancer is loss of MLH-1. Patients and methods: In this …