Objective To observe the influence of standardized deep well water on mortality and morbidity of esophageal cancer (EC) in Linzhou. In order to test the hypothesis of "nitrogenous compound metabolised cycling" in etiology of EC. Methods Based on the investigation data collected in 1999 among which some data were from Linzhou Institute of Prevention and Treatment of EC. Three kinds of water were included, standardized deep well water(SDWW) from the well with the depth exceeding 100 meters ,finished time exceeding 6 years; unstandardized deep well water(UDWW) and mountain spring water(MSW). The mortality and morbidity of EC in the the related population. Results There were 281 458 villagers of 165 villages to drink SDWW, 183 289 villagers of 129 villages to drink UDWW and 45 274 villagers of 50 villages to drink MSW. The morbidity and mortality of EC significantly decreased in residents who drank the SDWW compared with those who drank the UDWW and MSW, P

Objective: To analyze the survival rate of stomach cancer patients and its variation during different periods in Linzhou city, Henan Province, from 1988 to 2004, and evaluate the level of secondary prevention and diagnosis of stomach cancer in this area. Methods: All of the incidence and death records of stomach cancer from 1988 to 2004 were collected and matched from Linzhou Cancer Registry. The records that were identified as duplicate cases or had only death certificate (DCO) were excluded. The tumor cause eliminated life tables in this area were calculated and linked to the data of incidence and death of stomach cancer. FivE-year observed survival rates and fivE-year relative survival rates in three periods (1990-1994, 1995-1999, and 2000-2004) were calculated using period survival analysis mehod. The relative survival curves in the three periods were plotted. Results:The 5-year relative survival rate of stomach cancer was 26.66% during 1990-1994, 32.01% during 1995-1999, and 40.43% during 2000-2004 in Linzhou city. It showed a gradually increasing trend. The 5-year survival rates were higher in males than those in females. During 1990-1994 and 1995-1999, the 5-year survival rates of gastric cardia cancer were higher than those of non-cardia cancer. During 2000-2004 period, the 5-year survival rate of gastric cardia cancer was lower than that of non-cardia cancer. Conclusion: The survival rates of stomach cancer in Linzhou city are increasing gradually since 1990s in 20 century. It indicates that the levels of secondary prevention and clinical diagnosis and treatment on stomach cancer kept increasing in this area.