Accurately estimating breast cancer survival in Spain: cross-matching local cancer registries with the National Death Index Estimación precisa de la supervivencia de cáncer de mama en España: emparejamiento de los registros locales de cáncer con el Índice Nacional de Defunciones

• Main Authors: M. Carmen Martos, Carme Saurina, Cristina Feja, Marc Saez, M. Carmen Burriel, Maria Antònia Barceló, Pilar Gómez, Gemma Renart, Tomás Alcalá, Rafael Marcos-Gragera
• Format: Article in Journal/Newspaper
• Language: English; Spanish; Portuguese
• Published: Pan American Health Organization 2009
• Subjects: Neoplasias de la mama; vigilancia; registro médico coordinado; estadísticas vitales; tasa de supervivencia; España; Breast neoplasms; surveillance; medical record linkage; vital statistics; cancer survival rate; Spain; Medicine; R; Arctic medicine. Tropical medicine; RC955-962; Public aspects of medicine; RA1-1270; Arctic
• Online Access: https://doaj.org/article/8cee6dc6205a4bdfbac4d697f029e6f9

OBJECTIVES: To assess the impact of using data from the National Death Index (NDI) of Spain to estimate breast cancer survival rates among residents of Girona and Zaragoza diagnosed in 1995-1999. METHODS: This was an observational, longitudinal epidemiologic study, using two population- based cancer registries. Data collected were of female residents of Girona or Zaragoza who had been diagnosed with breast cancer in 1995-1999. Observed and relative 5-year survival rates were estimated, first using the information available from the Girona and Zaragoza cancer registries, and then with the inclusion of NDI data. The 5-year relative survival rate and corresponding 95% Confidence Intervals were estimated using the Hakulinen method. The Kaplan-Maier method and Log Rank test were used to compare survival curves. RESULTS: No statistically significant difference in survival curves was observed in Girona for the data obtained before and after cross-matching with the NDI. However, there was a significant difference in Zaragoza. A comparison of the relative survival rates of each of the two registries before NDI cross-matching showed differences of 3.9% (5-year) and 16.1% (10-year) between the two, whereas after the cross-match, the difference was only 0.5% (5-year) and 1.2% (10-year). CONCLUSIONS: In Spain it is imperative that there be systematic use of NDI data to supplement cancer registries, so that comparisons of relative survival rates between registries can be improved. OBJETIVO: Evaluar el efecto de utilizar los datos del Índice Nacional de Defunciones (IND) de España para estimar las tasas de supervivencia de cáncer de mama en las mujeres residentes en Girona y Zaragoza que recibieron el diagnóstico de cáncer de mama en 1995-1999. MÉTODOS: Se realizó un estudio epidemiológico observacional y longitudinal basado en el empleo de los registros de cáncer de mujeres residentes en Girona y Zaragoza que habían recibido el diagnóstico de cáncer de mama en 1995-1999. Se estimaron las tasas de supervivencias observada y ...