Hong Kong Med J 2011;17:89–95 | Number 2, April 2011
A population-based analysis of incidence, mortality, and stage-specific survival of cervical cancer patients in Hong Kong: 1997-2006
FY Cheung, Oscar WK Mang, Stephen CK Law
Hong Kong Cancer Registry, R Block, 1/F, Queen Elizabeth Hospital, Kowloon, Hong Kong
OBJECTIVES. To determine the trends in incidence and mortality of cervical cancer patients diagnosed during 1997 to 2006, and to describe stage-specific survival using population-based cancer registry data.
DESIGN. Retrospective, population-based study.
SETTING. Hong Kong.
PATIENTS. All patients diagnosed with cervical cancer between 1997 and 2006. Patients eligible for survival analysis were followed up till 31 December 2007.
MAIN OUTCOME MEASURES. Age-standardised incidence and mortality rates and average annual percent changes in these parameters were calculated using the Poisson regression model. Survival was expressed as relative survival rate using a period approach. Hazard ratios of mortality including 95% confidence intervals for certain variables were estimated using the Cox proportional hazards model.
RESULTS. During the 10-year period of the study, overall annual incidence and mortality rates decreased by 4.2% and 6.0%, respectively. Significant rates of reduction were observed in all age-groups except those younger than 45 years. The reduction in incidence of squamous cell carcinoma (3.6% annually) was less than that of adenocarcinoma (5.2%) and other histological types (6.8%). In all, 3807 (86.4%) of the patients were included in survival analysis. The overall 5-year relative survival rate was 71.3% (95% confidence interval, 69.5-73.1%), while the values for stages I, II, III, and IV were 90.9%, 71.0%, 41.7%, and 7.8%, respectively. Age, stage, and histology were independent prognostic factors. Survival of stage IA patients was as good as that of the general population.
CONCLUSIONS. As in other industrialised countries, the incidence and mortality rate of cervical cancer were decreasing. Stage-specific population-based cancer survival was available for the first time, and was useful as an indicator of cancer control. Collaboration between public and private sectors to further improve the follow-up data could provide more comprehensive surveillance information.
Key words: Epidemiologic studies; Incidence; Prevalence; Survival analysis; Uterine cervical neoplasms
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