Long-term survival trends of gastric cancer patients between 1972 and 2011 in Qidong.
BACKGROUND
There have been few reports on long-term survival of gastric cancer patients. This study analyzed the survival data of gastric cancer patients obtained from the population-based Qidong Cancer Registry between 1972 and 2011, providing a basis for evaluation of gastric cancer treatment and prognosis.


METHODS
The cumulative observed survival rate and relative survival rate of gastric cancer patients were calculated using Hakulinen's method via the SURV3.01 software, which was developed by the Finnish Cancer Registry. The date of the last follow-up for the survival status of the 15,401 registered cases was April 30, 2012.


RESULTS
The 1-, 5-, 10-, 20-, and 30-year observed survival rates were 33.82%, 14.18%, 10.35%, 6.63%, and 4.19%, respectively, and the 1-, 5-, 10-, 20-, and 30-year relative survival rates were 35.43%, 18.13%, 17.50%, 21.96%, and 32.84%, respectively. For males, the corresponding observed survival rates were 34.50%, 14.40%, 10.42%, 6.46%, and 4.05%, and the corresponding relative survival rates were 36.23%, 18.67%, 18.28%, 23.73%, and 38.61%. For females, the corresponding observed survival rates were 32.62%, 13.80%, 10.22%, 6.95%, and 4.46%, and the corresponding relative survival rates were 34.03%, 17.21%, 16.28%, 19.70%, and 26.78%. Significant differences in relative survival rates were observed between sexes (P = 0.003). For the 15-34, 35-44, 45-54, 55-64, 65-74, and 75+ age groups, the 5-year relative survival rates were 16.13%, 21.77%, 18.63%, 12.61%, 7.99%, and 2.94%, respectively, and the 10-year relative survival rates were 16.49%, 22.83%, 20.50%, 15.97%, 15.88%, and 15.73%, respectively. Remarkable improvement could be observed for the 5-, 10-, and 15-year relative survival rates in Qidong beginning in the 1980s.


CONCLUSIONS
The survival outcome of registered gastric cancer cases in Qidong showed gradual progress over the past two decades.
Qidong Liver Cancer Institute, Qidong People's Hospital, Qidong, Jiangsu, 226200, P.R. China. qdcys@126.com.
Yong-Sheng
YS
Chen
Qidong Liver Cancer Institute, Qidong People's Hospital, Qidong, Jiangsu, 226200, P.R. China. chenjg@vip.sina.com.|Department of Epidemiology, Nantong University Tumor Hospital/Institute, Nantong, Jiangsu, 226361, P.R. China. chenjg@vip.sina.com.
Jian-Guo
JG
Chen
Qidong Liver Cancer Institute, Qidong People's Hospital, Qidong, Jiangsu, 226200, P.R. China. jsqdzj8888@sina.com.
Jian
J
Zhu
Qidong Liver Cancer Institute, Qidong People's Hospital, Qidong, Jiangsu, 226200, P.R. China. 309797940@qq.com.
Yong-Hui
YH
Zhang
Qidong Liver Cancer Institute, Qidong People's Hospital, Qidong, Jiangsu, 226200, P.R. China. 119448035@qq.com.
Lu-Lu
LL
Ding
D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D002681:China / Q000453:epidemiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009026:Mortality / Q000639:trends; D012042:Registries; D017678:Sex Distribution; D013274:Stomach Neoplasms / Q000401:mortality*; D016019:Survival Analysis; D055815:Young Adult