Abstract: Objective Colorectal cancer in China has high morbidity and lethality and the epidemiologic characters such as increasing incidence, changing constituent ratio and clinical features.This study was to explore the clinical characteristics between right colon cancer and rectal cancer in Heilongjiang region among 15 years.Methods The clinical data of 2552 cases were confirmed pathologically and divided into 5-year groups were analyzed retrospectively.Result Compared with 1992-1997 group, right colon cancer and rectal cancer in the 2002-2006 had the following characters:the annual increase ratio were 6.7% and 6.0% respectively in hospitalization number;the median age of incidence increased from 53.1 and 52.8 to 60.5 and 57.6 respectively;the male/femal ratio decreased from 1.38∶1 to 1.19∶1 in right colon cancer and no significant variation was found in rectal cancer;the constituent ratio of rectal cancer decreased from 67.4% to 61.8% and right colon cancer no change;the proportion of Dukes A stage increased 3.8% and 2.6%, while Dukes D stage decreased 2.8% and 3.7% respectively.Conclusion In the past 15 years, the incidence of colorectal cancer were increasing in Heilongjiang province with an increase of median age of incidence;the constituent ratio of colorectal cancer were decreasing in rectal cancer and no change in right colon cancer, while Dukes A were increasing and Dukes D decreasing.

Key words: Right colon cancer, Rectal cancer, Clinical characteristic