Time trends in prostate cancer mortality according to major geographic regions of Brazil: an analysis of three decades

Tendência temporal da mortalidade por câncer de próstata segundo macrorregiões do Brasil: uma análise de três décadas

Las tendencias de la mortalidad por cáncer de próstata a través del tiempo, según las diferentes regiones brasileñas: un análisis de tres décadas

Abstracts

The aim of this study was to analyze prostate cancer mortality and time trends in Brazil, according to major geographic regions, States, and age brackets. Data on deaths from 1980 to 2010 were obtained from the Mortality Information System. Mortality trends were estimated using Prais-Winsten generalized linear regression. An upward time trend was observed in mortality in all regions of Brazil, with a mean annual increase of 2.8%. The upward trend in mortality occurred in most of the age brackets, with a concentration of deaths in men 70 to 79 years of age (41%) and a significant increase in the 40 to 60-year age bracket. The mortality rate increased significantly in all age brackets in the Northeast, compared to the other regions of Brazil. The study highlighted the importance of redistributing deaths from ill-defined causes in order to correct the mortality rates. The results point to significant regional differences and the need for continuous monitoring of mortality from prostate cancer in Brazil.

Prostatic Neoplasms; Mortality; Men's Health

Analisar a distribuição e a tendência temporal da mortalidade por câncer de próstata segundo macrorregiões, Unidades Federativas (UF) e faixa etária no Brasil. Foram utilizados dados do Sistema de Informações sobre Mortalidade (SIM), dos óbitos ocorridos entre 1980 e 2010. Estimou-se a tendência de mortalidade pelo método de Prais-Winsten de regressão linear generalizada. Verificou-se tendência temporal ascendente na taxa de mortalidade em todas as regiões do país, com aumento médio de 2,8% ao ano. A tendência ascendente na taxa de mortalidade ocorreu na maioria das faixas etárias, com concentração de óbitos entre homens de 70 a 79 anos (41%) e aumento significativo entre 40 e 60 anos. Houve um aumento significativo na taxa de mortalidade da Região Nordeste, e nas 25 UF em todas as faixas etárias comparada às demais regiões do Brasil. Verificou-se a importância na redistribuição de óbitos por causas mal definidas para correção das taxas de mortalidade. Os resultados apontam diferenças significativas regionais e a necessidade de monitoramento contínuo da mortalidade por câncer de próstata no Brasil.

Neoplasias da Próstata; Mortalidade; Saúde do Homem

Se analiza la distribución y la tendencia temporal de la mortalidad por cáncer de próstata según macrorregiones, Unidades Federativas (UF) y franja etaria en Brasil. Fueron utilizados datos del Sistema de Información sobre Mortalidad (SIM), con los óbitos acaecidos entre 1980 y 2010. Se estimó la tendencia de mortalidad por el método de Prais-Winsten de regresión lineal generalizado. Se verificó una tendencia temporal ascendente en la tasa de mortalidad en todas las regiones del país, con un aumento medio de un 2,8% al año. La tendencia ascendente en la tasa de mortalidad se produjo en la mayoría de las franjas de edad, concentrándose los óbitos entre hombres de 70 a 79 años (41%) y un aumento significativo entre 40 y 60 años. Hubo un aumento significativo en la tasa de mortalidad de la Región Nordeste, y en las 25 UF en todas las franjas de edad, comparadas con las demás regiones de Brasil. Se verificó la importancia en la redistribución de óbitos por causas mal definidas para la corrección de las tasas de mortalidad. Los resultados apuntan diferencias significativas regionales y la necesidad de un monitoreo continuo de la mortalidad por cáncer de próstata en Brasil.

Neoplasias de la Próstata; Mortalidad; Salud del Hombre

Introduction

Prostate cancer is the second leading tumor in incidence and the sixth cause of death among men in the world ¹. In Brazil, in the two years 2012 and 2013 there were approximately 60,180 new cases of prostate cancer, or an estimated risk of 62 new cases per 100,000 men, ranking first among cancers in men, excluding skin cancer ². In 20 years, the crude mortality rate increased from 3.7 deaths (1979) to 8.9 deaths per 100,000 (1990), ranking second as cause of death from cancer among men since 1999 ³. The economic cost of detecting, treating, and monitoring prostate cancer is high, due to the aggregate costs, burdening the health system and individual patients and contributing to the families’ impoverishment ⁴. In the United States, in 2008, expenditures were nearly US$ 110,520 per patient ⁵.

Prostate cancer raises serious challenges for the development of preventive measures, given the lack of knowledge on its natural history, in addition to presenting a prolonged latency period with multifocal and heterogeneous characteristics ⁶.

The only well-established risk factor for prostate cancer is age. Approximately 62% of cases in the world occur in men 65 years or older ². In the United States, prostate cancer incidence increased from 13.6 cases per 100,000 to 59.8 per 100,000 in men under 65 years, and from 649.3 to 763.4 cases per 100,000 in men over 65 years from 1975 to 2010 ⁷. This difference has been attributed to the increase in screening with digital rectal examination and prostate-specific antigen (PSA) screening in men 50 years and older ⁸.

Prostate cancer in individuals with a positive family history represents 13% to 26% of all cases. Epidemiological studies highlight that the risk of developing the disease among individuals with a family history is two to three times greater than expected for men of the same age bracket and ethnic group without a family history. Clinically, familial prostate cancer syndromes are diagnosed in 43% of patients less 70 years of age and 9% of those over 85 years ⁹.

Research also suggests that race or ethnicity is a risk factor for the disease, in addition to geographic region. Among African-descendant men in the United States, Jamaica, and other Caribbean countries, the risk of prostate cancer is 60% greater when compared to white Americans, while for Asian-American men the risk is 38% lower ⁹. This difference has been attributed to genetic susceptibility (5% to 10%) but also to heterogeneity in access to health services and different lifestyles between these groups. Diets with high animal fat and low intake of vitamins D and E, selenium, and isoflavonoids have been associated with increased risk of developing prostate cancer ^2,6.

Mortality rates from prostate cancer have decreased since 1990 in economically developed countries of North America and Europe and later in countries such as Chile, Argentina, Cuba, and Uruguay. Although this decline has been attributed to expansion in screening with PSA ¹⁰, there is no evidence of benefit from this measure for the majority of men without symptoms of the disease ^11,12.

Studies in Brazil since the 1980s point to an upward trend in the mortality rate from prostate cancer ^13,14,15. The South and Southeast, the wealthiest and most economically developed regions of the country, show a higher share of deaths from cancer when compared to the North and Northeast ^13,15. In Recife, capital of Pernambuco State in Northeast Brazil, Oliveira Jr. & Cesse ¹⁶ showed that although prostate was the second most common cancer site among men, since the risk was concentrated in the over-50 age bracket, its impact on years of potential life lost (YPLL) was the second lowest in 1990 and the lowest in 1999 (with a 24.6% drop in that decade), suggesting that deaths from prostate cancer were occurring at older ages.

Few studies in Brazil have analyzed mortality trends from prostate cancer. Secondary mortality data are available with 100% coverage and high national scope, thus allowing evaluations of trends in the disease itself and in health services’ case-resolution capacity. However, there are important gaps in knowledge on differences in health services access, use, and performance, besides cultural and socioeconomic characteristics related to lifestyle. These aspects appear to be reflected in annual variations in mortality rates from prostate cancer, with significant differences between the country’s major geographic regions in the last 31 years of coverage of the national Mortality Information System.

A literature review on prostate cancer mortality trends in PubMed, SciELO, and LILACS from June 2002 to June 2012 showed that the last such study in Brazil was published in 2011, referring to overall mortality trend from cancer, including prostate, from 1980 to 2006 ¹⁷.

Considering the epidemiological relevance of prostate cancer in male morbidity and mortality, and since it shows good prognosis when detected in the early stages, on-going studies on its mortality trends should be encouraged. The current study thus aimed to analyze the distribution and time trend in mortality from prostate cancer according to the major geographic regions of Brazil.

Methods

The study analyzed historical series of prostate cancer mortality according to age bracket, States, and major geographic regions of Brazil from 1980 to 2010. Data on deaths (the numerator in the mortality rate) were obtained from the Mortality Information System (Information Technology Department of the Brazilian Unified National Health System. http://www.datasus.gov.br), including deaths from prostate cancer classified in the 9^th and 10^th revisions of the International Classification of Diseases (ICD-9 and ICD-10) with codes 185 (from 1980 to 1995) and C61 (1996 to 2010) (Information Technology Department of the Brazilian Unified National Health System. Informações de Saúde: Demográficas e Socioeconômicas. http://www2.datasus.gov.br/DATASUS/index.php?area=0206, accessed on 14/Feb/2012). Demographic data were population estimates (the denominator in mortality rates) provided by the Brazilian Institute of Geography and Statistics (IBGE. População Residente – Brasil, 2011. http://tabnet.data sus.gov.br/cgi/tabcgi.exe?ibge/cnv/popuf.def, accessed on 06/Dec/2011) for the respective years.

In order to minimize potential bias due to differences in data quality on death certificates between States and over the years, the percentage of deaths from ill-defined causes was redistributed among other causes of death, except external causes ¹⁸.

Deaths from ill-defined causes with codes 780-799 and R00-R99 in ICD-9 and ICD-10, respectively, were redistributed proportionally according to the methodology used by the World Health Organization (WHO) ¹⁹. This technique follows proportional redistribution by which coded deaths occur in each of the chapters of ICD-9 and ICD-10 among deaths from defined causes, except for external causes, and has been used in other Brazilian studies ¹⁸. Correction factors were calculated according to the following formula: correction factor = total deaths - deaths from external causes/total deaths - deaths from external causes - deaths from ill-defined causes.

To avoid overestimating the number of deaths from prostate cancer, we distributed 50% of the ill-defined causes as corresponding to neoplasms in each age bracket and State. This criterion was based on Mello-Jorge et al. ²⁰ for validation of ill-defined causes of death.

Deaths corrected by State and age bracket were totaled to comprise the data by major geographic region and Brazil as a whole. Mortality rates were calculated and standardized with and without correction, by age, using the direct method, taking the standard world population as the reference ²¹. Time trend analyses were performed according to major geographic regions (Central-West, Northeast, North, Southeast, South) and age brackets (40-59, 60-69, 70-79, ≥ 80 years), and by State.

Time trend analysis used Prais-Winsten generalized linear regression ²², which allowed correction of first order autocorrelation in the analysis of data organized over time. It was thus possible to interpret whether the mortality trends were increasing, decreasing, or stable, besides quantifying the mean annual mortality increment with the respective 95% confidence intervals (95%CI). Statistical analysis used Stata version 9 (Stata Corp., College Station, USA).

To improve the visual grasp in the graphic display of time trends, third order moving average smoothing was used ²².

Results

From 1980 to 2010 there were 196,550 deaths from prostate cancer in Brazil, 49.7% in the Southeast region of the country and 20.6% in the Northeast. Redistribution of deaths from ill-defined causes led to a 7.7% increase, totaling 211,654 deaths. Standardized mortality rates increased from 9.9 (unadjusted) to 10.8 deaths per 100,000 men after correction, for the period’s overall average. Risk of death from prostate cancer in Brazil increased from 6.6 in 1980 to 14.2 deaths per 100,000 men in 2010 (corrected rates) (Figure 1).

Figure 1
- Historical series of mortality rates * from prostate cancer according to major geographic regions of Brazil from 1980 to 2010.

There was an upward trend in the mortality rate from prostate cancer in all major geographic regions of the country. The mortality rate in the Northeast increased from 3.8 in 1980 to 14.3 deaths/100,000 men in 2010. In the South, the rate increased from 7.8 to 15.1 deaths, and in the Southeast from 6.9 to 14.3 deaths/100,000 men (Figure 2).

Figure 2
- Prostate cancer mortality rate, uncorrected and corrected, in Brazil from 1980 to 2010.

Table 1 shows the mean variation in mortality rates according to the major geographic regions and the country as a whole, and the respective prostate cancer mortality trends. The Northeast showed the highest mean annual variation with 5%, while the lowest rates were in the South and Southeast, with mean annual increases of 2.4% and 2.6%, respectively. Although the risk of death increased in all the regions, the upward trend was smaller in the South and Southeast.

Table 1
- Prostate cancer mortality trend, total corrected deaths, mean variation (% and 95% confidence interval – 95% CI), according to major geographic regions of Brazil, 1980 to 2010.

Regions	Corrected deaths	Mean variation (%)	95%CI		Interpretation
			Lower	Upper
Central-West	12,189	3.5	2.9	4.1	Upward
Northeast	47,055	5.0	4.5	5.5	Upward
North	7,592	3.5	2.6	4.4	Upward
Southeast	105,089	2.6	2.0	3.2	Upward
South	39,730	2.4	1.8	3.1	Upward
Brazil	211,654	2.8	2.2	2.4	Upward

The highest mortality rates from 1980 to 2005 occurred in the South and Southeast. For 18 and 10 years, respectively, the States of Rio Grande do Sul and Rio de Janeiro maintained the highest mortality rates, although with downward time trends (data not shown).

The North showed the lowest rates from 1983 (3.7 deaths per 100,000 men) to 2010 (10.1 deaths per 100,000 men) (data not shown).

Table 2 shows the trends in mortality rates in the five geographic regions according to the age bracket. The 70-and-older bracket concentrated 41.4% of the deaths in the country. Of the total deaths, 6.5% occurred below 60 years of age.

Table 2
- Prostate cancer mortality trend and mean variation (% and 95% confidence interval – 95% CI) according to age brackets and major geographic regions of Brazil, 1980 to 2010.

Regions	Mean variation [% (95%CI)]				Interpretation
	40-59	60-69	70-79	≥ 80	40-59	60-69	70-79	≥ 80
Central-West	1.4 (-0.1; 2.9)	2.4 (1.8; 3.1)	2.4 (1.8; 3.0)	3.2 (2.2; 4.2)	Stable	Upward	Upward	Upward
Northeast	2.1 (1.6; 2.6)	3.6 (2.9; 4.3)	4.2 (3.5; 4.9)	5.5 (4.6; 6.5)	Upward	Upward	Upward	Upward
North	1.5 (0.1; 2.9)	2.5 (2.0; 3.0)	3.1 (2.8; 3.5)	3.0 (1.9; 4.0)	Upward	Upward	Upward	Upward
Southeast	0.9 (0.2; 1.6)	0.9 (-0.1; 2.0)	0.9 (-0.2; 2.0)	1.9 (0.9; 2.9)	Upward	Stable	Stable	Upward
South	0.6 (-0.2; 1.4)	0.9 (0.0; 1.9)	1.6 (1.0; 2.3)	2.4 (1.4; 3.3)	Stable	Upward	Upward	Upward
Brazil	1.1 (0.5; 1.7)	1.5 (0.5; 2.4)	1.9 (1.2; 2.6)	2.9 (2.3; 3.5)	Upward	Upward	Upward	Upward

Younger men (40 to 59 years of age) showed a stable mortality trend in the Central-West and South and an upward trend in the other regions. Comparing the 40-59 and 60-69-year age brackets, the risk of dying increased 13 times in the country (from 3.0 to 39.7 deaths per 100 thousand men). Mean variation in mortality rates was significantly higher in the Northeast compared to the other regions of Brazil, in all age brackets (Table 2).

Discussion

The study found an increase in mortality rates from prostate cancer in all regions of Brazil from 1980 to 2010. The highest rates occurred in the South and Southeast. However, in the North and Northeast the mean annual increase was higher in the three decades.

International time trend studies on mortality rates from prostate cancer identified decreases in England ²³, France, Australia, United States ²⁴, Singapore ²⁵, Nordic countries ²⁶, Austria ²⁷, and Norway ²⁸. Explanations for the downward trends in different countries suggest multiple factors, including changes in treatment strategies ^24,28.

As in Brazil, countries like Russia, Japan, ²⁴ and Poland ²⁹ presented upward mortality trends, suggesting natural aging ²⁴ of the population as the principal trigger in cell alterations.

In the 1990s, the increase in prostate cancer incidence in all the Nordic countries except Denmark led to the suspicion that the mortality trend was overestimated. Older patients may have had prostate cancer recorded as their cause of death, while other causes such as heart failure and lung diseases may have been the real underlying causes of death ³⁰.

A study that compared mortality from prostate cancer in the United States and the United Kingdom showed that differences in treatment can help explain differences in mortality trends between countries. In the United States, prostate cancer patients receive more aggressive treatment for the disease (radical prostatectomy) compared to the United Kingdom, where the mortality trend is higher. The drop in mortality in the United States may also be favored by the large number of trials involving new therapeutic approaches (Information Technology Department of the Brazilian Unified National Health System. IDB 2010 Brasil: Indicadores de Mortalidade, 2010. http://tabnet.datasus.gov.br/cgi/tabcgi.exe?idb2010/c05.def, accessed on 04/Sep/2012).

In Brazil, PSA tests paid for by the Brazilian Unified National Health System increased by 573.3% (from 34,157 to 195,825) from 1999 to 2007, with no indication of population and opportunistic screening by the Ministry of Health. The Southeast region supplied the most test, especially in the States of São Paulo and Minas Gerais (31.7% and 15%) ³¹, which may have contributed to an increase in prostate cancer diagnosis. There was a 32.9% increase in diagnostic and therapeutic services from 2005 to 2009. From the regional perspective, the largest increases in services occurred in the Northeast (50.7%) and North (35%) and the lowest in the Central-West (15.2%) ³². However, the expansion of testing in the country had no impact in terms of a reduction in mortality.

The reduction in deaths from ill-defined causes and thus improvement in classification of causes of mortality for diseases in general in the Northeast and North can also be explained by the implementation of specific programs and actions at the Federal, State, and Municipal levels. In Brazil, the proportion of deaths from ill-defined causes decreased from 20% in 1980 to 7.2% in 2009, when it varied from 3.8% in the Central West to 7.7% in the Northeast ³³.

The increasing mortality rates in all States of the Northeast are also consistent with a study from 1996 to 2005, focusing on uterine cervical cancer ³⁴. Improved access to diagnostic tests in the interior, leading to an increase in case detection, help explain this situation. Meanwhile, a study in Corumbá, Mato Grosso do Sul State ³⁵, identified a downward trend in prostate cancer mortality, suggesting that improved diagnosis and treatment accounts for the drop in death from prostate cancer, corroborating other studies ^{23,24,25,26,27}. According to a study from 1980 to 2006, the increase in mortality rate was common to all the State capital cities in the major geographic regions, except the South of Brazil, where rates were higher in the countryside ¹⁶. According to the current study, the South and Southeast, Brazil’s wealthiest regions, showed the lowest mean annual increases, below average for the country. Quality of care, training in diagnosis and treatment, quality of information provided to patients, and increased survival for patients with a cancer diagnosis may have contributed to the differences in relation to the other regions of the country ³⁶.

Analysis of mortality rates from prostate cancer by age bracket showed an upward trend in most of the regions. The exceptions, with stable mortality rates, included the Southeast (60 to 79 years of age) and Central-West and South (40 to 59 years), presumably due to intensification of early treatment, considering the increasing supply of radiotherapy services in these regions ¹⁷. Upward trends in the other regions at ages above 70 years corroborated the study by Fonseca et al. ¹⁴, which included prostate cancer in Brazilian State capitals.

Argentina showed an upward annual trend in prostate cancer mortality rates from 1986 to 1998 in age brackets 55 to 64 years (1.3%), 65 to 74 (3.6%), and 75 and older (4.4%), with a drop in subsequent years. The increase in deaths in older age brackets confirmed the striking effect of age, or the relationship between aging and mortality. The lower risk in younger age groups in this study suggests the influence of healthier behavioral factors ³⁷.

The current study showed a significant upward trend in the mortality rate in the 40 to 59-year age bracket, except in the Central-West and South of Brazil. In England and Wales, the mortality rate from prostate cancer declined by 26% from 1992 to 2004 in the 55 to 74-year age bracket. The findings suggest greater use of radical prostatectomy to treat localized tumors, contributing to a reduction in long-term mortality trends. In Brazil, there is still a gap in research on the association between the increase in deaths in the younger age bracket and family history ¹⁰.

Potential limitations to this study include the inability to disaggregate State mortality rates between the capital and the interior, in addition to the fact that the correction of deaths did not contemplate the imputation of unrecorded ages. However, in this study only 267 deaths (0.14%) presented unknown age.

The study increased the visibility and updated the situation with prostate cancer mortality in Brazil and its major geographic regions. However, strategies are still needed to improve control measures for prostate cancer. The study highlights the importance of on-going improvement in data from information systems, indispensable for monitoring diseases.

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Publication Dates

• Publication in this collection
  Mar 2014

History

• Received
  16 Jan 2013
• Reviewed
  24 July 2013
• Accepted
  22 Aug 2013