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Open Access Research article

Female breast cancer survival in Qidong, China, 1972–2011: a population-based study

Jian Zhu1, Jian-Guo Chen12*, Yong-Sheng Chen1, Yong-Hui Zhang1, Lu-Lu Ding1 and Tao-Yang Chen1

Author Affiliations

1 Qidong Liver Cancer Institute, Qidong Cancer Registry, Qidong People’s Hospital, Qidong 226200, China

2 Nantong University Tumor Hospital/Institute, School of Public Health, Nantong 226361, China

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BMC Cancer 2014, 14:318  doi:10.1186/1471-2407-14-318

Published: 6 May 2014

Abstract

Background

Based on data from the population-based Qidong Cancer Registry, we report a survival analysis for female breast cancer patients diagnosed during 19722011 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 1534, 3544, 4554, 5564, 6574, 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 20032007, and the 10-year RS rates from 43.16% in 1972 to 60.85% in 19982002, 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.

Keywords:
Breast cancer; Cancer registration; Observed survival; Relative survival; Qidong