UA0000534 2»J INTERNATIONAL CONFERENCE: LONG-TERM HEALTH CONSEQUENCES OF THE Kiev, , June 1-6, 1998 INCIDENCE OFMALIGNANTNEOPLASMS IN THE POPULATION OFGOMELREGIONAFTERCHERNOBYLACCTDENT Okeanov A.E. N.N. Alexandrov's, Research Institute of Oncology and Medical Radiology, ,

Before the Chernobyl accident malignant neoplasm's incidence in region was one of the lowest in Belarus and made up an average of 147.5 per 100 000 of population in 1976-1985, compared to that of 158.2 in and 166.4 in Mogilyov regions in the same time period. The distinctive feature of the post-accident period is a considerable change in incidence levels and rates of a number of a solid tumors, which gives a reason for evaluating of radiation component contribution to these changes. The overall incidence of all forms of malignant tumors in amounted to 204.9 on the average in 10-year period (1987-1996) after the Chernobyl accident, outstripping the incidence in . A significant increase in thyroid cancer incidence is notable in the population of Gomel region. Mean incidence of thyroid cancer in the entire population of Gomel region in 1987-1996 was 5.8 per 100 000 compared to 2.7 in population. A significant evaluation in growth rates of lung cancer incidence was registered in Gomel region, whereas this pattern is not observed in the population of Minsk and other . A significant rise in incident growth rates of other malignant tumors (colon, rectum, larynx, urinary bladder) is also observed in Gomel region. As for gastric tumors, there was a trend to decrease in their incidence in pre-accident period. In the post-accident decade this trend changed for stability, and in the recent years a small growth in the incidence has been observed (the differences are significant). Breast cancer incidence and coefficients of regression have significantly increased in both Minsk and Gomel regions. Acceleration in incidence growth rates of larynx cancer has been also noticed in Vitebsk region which is actually not contaminated with radionuclides. A noticeable growth in renal cancer incidence and its acceleration are characteristic of all Belarus regions and probably not related to the effect of additional radiation.

1st FORUM Epidemiological aspects of the Chernobyl disaster 101