title: Female breast cancer survival in Qidong, China, 1972-2011: a population-based study.
abstract: BACKGROUND
  Based on data from the population-based Qidong Cancer Registry, we report a survival analysis for female breast cancer patients diagnosed during 1972-2011 in order to assess the long-term trends for the prognosis of this cancer.
  
  
  METHODS
  The last follow-up for survival status of the 3,398 registered female breast cancer cases was April, 2012. Cumulative observed survival (OS) and relative survival (RS) rates were calculated using Hakulinen's method performed by the SURV3.01 Software developed at the Finnish Cancer Registry.
  
  
  RESULTS
  The one-, three-, five-, ten-, fifteen-, twenty-, thirty-, and forty- year OS rates were 83.61%, 67.53%, 58.75%, 48.56%, 42.57%, 38.30%, 29.19%, 19.35%; and the RS rates were 84.76%, 70.45%, 63.12%, 56.81%, 55.26%, 56.36%, 62.59%, 84.00%, respectively. Five-year RS rates of age groups 15-34, 35-44, 45-54, 55-64, 65-74, and 75+ were 60.17%, 68.27%, 67.79%, 56.03%, 55.50%, and 57.28%; 10-year RS rates were 54.16%, 59.59%, 61.34%, 47.78%, 51.30%, and 59.28%, respectively. There were statistical differences among the age groups (RS: χ2 = 152.15, P = 0.000). Remarkable improvement could be seen for the 5-year RS rates from 52.08% in 1972 to 69.26% in 2003-2007, and the 10-year RS rates from 43.16% in 1972 to 60.85% in 1998-2002, respectively.
  
  
  CONCLUSIONS
  Survival outcomes from Qidong registered cases with breast cancer have shown gradual progress during the past 40 years. The disparities between survival rates of this area and developed countries are getting narrower, but there is still great need for improving survival in Qidong.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhu
authors.affiliation: Qidong Liver Cancer Institute, Qidong Cancer Registry, Qidong People's Hospital, Qidong 226200, China. chenjg@vip.sina.com.
authors.forename: Jian-Guo
authors.initials: JG
authors.lastname: Chen
authors.forename: Yong-Sheng
authors.initials: YS
authors.lastname: Chen
authors.forename: Yong-Hui
authors.initials: YH
authors.lastname: Zhang
authors.forename: Lu-Lu
authors.initials: LL
authors.lastname: Ding
authors.forename: Tao-Yang
authors.initials: TY
authors.lastname: Chen
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000367:Age Factors; D000368:Aged; D001943:Breast Neoplasms / Q000175:diagnosis / Q000401:mortality* / Q000628:therapy; D002681:China / Q000453:epidemiology; D005260:Female; D054624:Health Status Disparities; D054625:Healthcare Disparities; D006801:Humans; D008875:Middle Aged; D011379:Prognosis; D012042:Registries; D016019:Survival Analysis; D015996:Survival Rate; D013997:Time Factors; D055815:Young Adult