Epidemiology of breast cancer in females of reproductive age in Kyrgyzstan.

The goal of this research was to study breast cancer morbidity in females of reproductive age in Kyrgyzstan. Information on patients was obtained from the National Center of Oncology under the Ministry of Health and the National Statistics Committee of the Kyrgyz Republic. The research was retrospective and covered the period from 1995-2002. Cancer morbidity ratios were calculated for reproductive age according to standard methods of medico-biological statistics. The breast cancer morbidity in the country's female population was determined as 12.3+/- 0.2/100,000. The research revealed ethnic specificity: in Russians (crude rate, 32.9+/- 2.1) was higher (p<0.001), than in Kyrgyz and Uzbek females, who demonstrated equal crude incidence rates of -8.0 +/- 0.6. The dynamics over time showed increase in Kyrgyz and Uzbek females but decrease in Russians. Age ratios analysis showed higher morbidity in later reproductive age (40-49 years), with a statistically significant difference (p<0.001) between ethnic Europeans and Asians.