A Epidemiologic Investigation Of Cancers Among Medical Diagnostic X-ray Workers In Jiangsu Province

Objective To research the phenomenon and characteristic of radiation oncogenesis among medical diagnostic X-ray workers. Methods The cancer incidence data of the fixed cohort from the beginning of 1950 to the end of 1996 was collected. The estimates of relative risk (RR) were calculated by AMFIT in Epicure (Hirosoft International Corp. 1988-1992). Results During the period of 1950-1996 there were 312 cancers among 215355 Pyr at risk in the cohort of 7701 subjects, which came from medical diagnostic x-ray workers and other hospital workers in the same hospitals. The RR adjusted for sex and age for overall cancers was more than 1. The incidence of female breast increased significantly (RR=3.3,95%CI=l.39-8.07),the relative risks for solid cancer and leukemia were 1.2 and 2.6. The difference between exposed and control in average age of cancer occurrence reached significance lever and former was 51.3 years old while latter was 55.0 years old. Conclusion We still found the effect of radiation oncogenesis on medical diagnostic X-ray workers althougth the sample size was not large enough to make definite conclusion statistically in all cancers. Further follow-up is necessary.Yu NingleDirected by Li Shijun...