title: [Trends in the mortality of liver cancer in Qidong, China: an analysis of fifty years].
abstract: OBJECTIVE
  To describe and analyze the charecteristics and trends of liver cancer mortality during the past fifty years in Qidong, China.
  
  
  METHODS
  Retrospective mortality survey was conducted to get the data on liver cancer death in the period of 1958-1971, and the data from 1972 to 2007 were obtained from the records of cancer registration in Qidong. The crude mortality rate (CR) of liver cancer, and age-standardized rate by Chinese population (CASR) and by world population (WASR) were calculated and analyzed. The total percent changes (PC) and annual percent changes (APC) were used for evaluating the increasing trends of the mortality. The sex-specific rate, age-specific rate, truncated rate of the age group 35 - 64, cumulative rate of the age group 0-74, cumulative risk, period-rate, and the rate for age-birth cohort were compared.
  
  
  RESULTS
  The natural death rate in Qidong residents for the past five-decade period experienced a wave interval of 8.62‰ in 1958 down to 5.37‰ in 1979, and up to 7.75‰ in 2007. The mortality rate for all-site cancers was increased from 56.69 per 100, 000 to 234.97 per 100, 000. The mortality rate of liver cancer, being 20.45 per 100, 100 in 1958 was increased to 49.04 per 100, 000 in 1972, and up to 69.29 per 100, 000 in 2007. According to the registration data of 1972 - 2007, the death from liver cancer was accounted for 34.88% of all deaths due to cancers, with a CR of 58.86 per 100, 000, CASR of 38.36 per 100, 000, and WASR, 49.37 Per 100, 000 in Qidong. The truncated rate for the age group 35 - 64 was 117.08 per 100, 000, and the cumulative rate for the age group 0-74 and the cumulative risk were 5.15% and 5.02%, respectively. The CRs for males was 90.52 per 100, 000 and for females was 27.93 per 100, 000, with a sex ratio of 3.24:1. For the period of 1972 - 2007, the PC for CR was 49.71%, and APC was +1.41%, showing an increasing variation tendency. The APCs for CASR and WASR, however, were decreasing, with a percentage of -1.11%, and -0.84%, respectively. The age-specific mortality rates by period showed a decreasing trend for those under age of 44. Moreover, age-birth cohort analysis showed a more rapid lowering mortality in the age groups 35-, 30-, 25-, and 15-, that is, those born after 1950's.
  
  
  CONCLUSIONS
  Liver cancer remains the leading death cause due to cancers in Qidong, with a continuing higher crude mortality rate. Yet the age-standardized mortality rate has presented a declining posture. The liver cancer mortality in young people in Qidong demonstrates a continuously falling trend. The campaign for the control of liver cancer in Qidong has achieved initial success.
authors.affiliation: Department of Epidemiology, Qidong Liver Cancer Institute, China. chenjg@vip.sina.com
authors.forename: Jian-guo
authors.initials: JG
authors.lastname: Chen
authors.forename: Jian
authors.initials: J
authors.lastname: Zhu
authors.forename: Yong-hui
authors.initials: YH
authors.lastname: Zhang
authors.forename: Yong-sheng
authors.initials: YS
authors.lastname: Chen
authors.forename: Lu-lu
authors.initials: LL
authors.lastname: Ding
authors.forename: Jian-hua
authors.initials: JH
authors.lastname: Lu
authors.forename: Yuan-rong
authors.initials: YR
authors.lastname: Zhu
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D002681:China / Q000453:epidemiology; D005260:Female; D006801:Humans; D007223:Infant; D008113:Liver Neoplasms / Q000401:mortality*; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000401:mortality; D012042:Registries; D012189:Retrospective Studies; D012737:Sex Factors; D055815:Young Adult