Thyroid cancer incidence in the city of Tianjin during 2002 -2006 and its secular trend in recent 26 year

Abstract

Objective To conduct a descriptive epidemiological study on thyroid cancer incidence in the urbanarea of Tianjin during 2002 - 2006 and to analyze the secular trend of incidences based on previous data of 26 years and those from Shanghai and the United States. Methods Annual percent change (APC%) of thyroid cancer incidence and the rank of all-site cancer profiles were estimated. The secular trend of different histological incidences and the proportion changes were analyzed. Results The incidence of female thyroid cancer was 6. 55/100000 in 2006, ranking the eighth in the female cancer profile. The incidence of thyroid cancer showed an increased secular trend in recent 26 years, especially a 5.7-fold increase in the papillary thyroid cancer (PTC). The incidence for female increased by 267% in 2006 compared to that in 1981, APC% was 3. 1%. The variation ranked second among all the female tumors. The incidences of thyroid cancer in Shanghai and the United States also elevated with time.Conclusions Thyroid cancer has been one of female common tumors from a once less common tumor,especially the proportion of PTC is expanding. It suggests that further study on the risk factors and preventive efforts should be made. Key words: Thyroid neoplasms; Epidemiology; Incidence; Secular trend