[Cancer Survival between 1995 and 2004 in the Basque Country, Spain].

BACKGROUND: geographic differences described in the prognosis of cancer patients in the Basque Country have been attributed to a different incidence in tumours with different lethality. Therefore, cancer relative survival adjusted by case-mix was included to estimate cancer survival by provinces and health regions, using data from 1995 to 2004. METHODS: a total of 93 585 cases of malignant tumours were identified from a population-based cancer registry. The five-year relative survival (RS) was calculated using Ederer´s method. The five-year relative excess risk (RER) of death was estimated with a generalised linear model, standardized by age and adjusted for sex, date of diagnosis and case-mix. RESULTS: the five-year RS increased from period 1995-1999 to 2000-2004, this latter, with values ranging by health regions between 46-58% and 57-65% in men and women, respectively. There was an excess risk of death in Bizkaia (RER=1.06, CI95%: 1.03-1.09), this same effect being identified in almost all the health regions in the province. In contrast, in Gipuzkoa province, differences were only statistically significant in the Gipuzkoa and Tolosa health regions (RER=1.07; CI95%: 1.02-1.13 and RER=0.91; CI95%: 0.84-0.98, respectively), and even these disappeared after adjusting for potential confounders. CONCLUSIONS: cancer patients of Bizkaia, except for the Uribe health region, presented a worse prognosis.

Supervivencia del cáncer en el País Vasco entre 1995-2004 / Cancer survival between 1995 and 2004 in the Basque Country, Spain

Fundamentos: las diferencias geográficas descritas en el pronóstico de los pacientes de cáncer en el País Vasco han sido atribuidas a la diferente incidencia en tumores de diferente letalidad. Por ello, se incluye la supervivencia relativa del cáncer ajustada por la casuística para estimar la supervivencia del conjunto de los tumores malignos por provincias y comarcas sanitarias, utilizando los datos de 1995 a 2004. El objetivo del trabajo es estimar la supervivencia de los tumores malignos en el País Vasco por provincias y comarcas sanitarias durante el período 1995-2004. Métodos: se incluyeron 93.585 tumores malignos del registro poblacional de cáncer. Se calculó la supervivencia relativa (SR) a 5 años con el método de Ederer. Se estimó el exceso de riesgo relativo (ERR) de muerte a los 5 años con el modelo lineal generalizado, estandarizando por edad y ajustando por sexo, período de diagnostico y casuística. Resultados: la SR a los 5 años aumentó en el período 2000-2004 con respecto a 1995-1999 con valores que oscilaron por comarcas entre el 46-58% y el 57-65% en hombres y mujeres, respectivamente. Se observó un exceso de riesgo de muerte en pacientes de Bizkaia (ERR= 1,06; IC95%: 1,03-1,09, efecto que se observo en casi todas sus comarcas. Por el contrario, en Gipuzkoa, sólo las comarcas Gipuzkoa y Tolosa mostraron diferencias significativas (ERR=1,07; IC95%: 1,02-1,13 y ERR=0,91; IC95%: 0,84-0,98, respectivamente), las cuales desaparecieron al ajustar el modelo. Conclusiones: dentro del Pais Vasco fueron los pacientes de Bizkaia, a excepción de la comarca Uribe, los que presentaron peor pronóstico(AU)

Background: geographic differences described in the prognosis of cancer patients in the Basque Country have been attributed to a different incidence in tumours with different lethality. Therefore, cancer relative survival adjusted by case-mix was included to estimate cancer survival by provinces and health regions, using data from 1995 to 2004. Methods: a total of 93 585 cases of malignant tumours were identified from a population-based cancer registry. The five-year relative survival (RS) was calculated using Ederer's method. The five-year relative excess risk (RER) of death was estimated with a generalised linear model, standardized by age and adjusted for sex, date of diagnosis and case-mix. Results: the five-year RS increased fromperiod 1995-1999 to 2000- 2004, this latter, with values ranging by health regions between 46-58% and 57-65% in men and women, respectively. There was an excess risk of death in Bizkaia (RER=1.06, CI95%: 1.03-1.09), this same effect being identified in almost all the health regions in the province. In contrast, in Gipuzkoa province, differences were only statistically significant in the Gipuzkoa and Tolosa health regions (RER=1.07; CI95%: 1.02-1.13 and RER=0.91; CI95%: 0.84-0.98, respectively), and even these disappeared after adjusting for potential confounders. Conclusions: cancer patients of Bizkaia, except for the Uribe health region, presented a worse prognosis(AU)

Recent changes in breast cancer incidence in Spain, 1980-2004.

BACKGROUND: Since the 1980s, Spain experienced two decades of sharply increasing breast cancer incidence. Declines in breast cancer incidence have recently been reported in many developed countries. We examined whether a similar downturn might have taken place in Spain in recent years. METHODS: Cases of invasive female breast cancer were drawn from all population-based Spanish cancer registries that had at least 10 years of uninterrupted registration over the period 1980-2004. Overall and age-specific changes in incidence rates were evaluated using change-point Poisson models, which allow for accurate detection and estimation of trend changes. All statistical tests were two-sided. RESULTS: A total of 80,453 incident cases of invasive breast cancer were identified. Overall age- and registry-adjusted incidence rates rose by 2.9% (95% confidence interval [CI] = 2.7% to 3.1%) annually during the 1980s and 1990s; there was a statistically significant change in this trend in 2001 (95% CI = 1998 to 2004; P value for the existence of a change point <.001), after which incidence declined annually by 3.0% (95% CI = 1.8% to 4.1%). This trend differed by age group: There was a steady increase in incidence for women younger than 45 years, an abrupt downturn in 2001 for women aged 45-64 years, and a gradual leveling off in 1995 for women aged 65 years or older. Separate analyses for registries that had at least 15 years of uninterrupted registration detected a statistically significant interruption of the previous upward trend in breast cancer incidence in provinces that had aggressive breast cancer screening programs and high screening participation rates, including Navarra (change point = 1991, P < .001), Granada (change point = 2002, P = .003), Bizkaia (change point = 1998, P < .001), Gipuzkoa (change point = 1998, P = .001), and Araba (change point = 1997, P = .002). CONCLUSIONS: The recent downturn in breast cancer incidence among Spanish women older than 45 years is best explained by a period effect linked to screening saturation.