ABSTRACT:

Objective:

To analyze the incidence, mortality and survival of prostate cancer in Cuiabá and Várzea Grande, Brazil from 2000 to 2016.

Methods:

Data from the Population-based Cancer Registry and the Mortality Information System were used. Mortality and incidence trends were analyzed using joinpoint regression models by age group. Survival analyses were performed using the Kaplan-Meier method, and hazard ratio was estimated by age group.

Results:

From 2000 to 2016, 3,671 new cases and 892 deaths for prostate cancer were recorded. The average incidence and mortality rates were 87.96 and 20.22 per 100,000, respectively. Decreasing incidence trend was noted for all age groups from 2006 to 2016 (APC=-3.2%) and for men with 80+ years of age from 2000 to 2016 (APC=-3.0%), and increasing mortality trend for men 60-69 years of age from 2000 to 2009 (APC=3.2%). The specific five-year survival rate for prostate cancer was 79.6% (95%CI 77.2–81.9), and the rate decreased with advanced age (HR=2.43, 95%CI 1.5–3.9, for those 70 to 79 years old and HR=7.20, 95%CI 4.5–11.5, for those 80 or older).

Conclusion:

The incidence rate of prostate cancer showed a decreasing trend from 2006 for all age groups; the mortality rate was stable in that period, and worse prognosis was observed in men 70 years or older.

Keywords:
Prostate cancer; Incidence; Mortality; Survival

INTRODUCTION

According to the Global Cancer Statistics (GLOBOCAN), excluding non-melanoma skin cancer, it was estimated in the world for the year 2020, that there were 19.3 million new cases of cancer and 9.9 million related deaths, where 10.1 million (52.3%) and 5.5 million (55.5%), respectively, were in men. Prostate cancer has an estimated risk ranging from 6.3 to 83.4/100,000, with higher levels in China and Eastern European countries such as Belarus, Bulgaria and Slovakia1¹1 Sung H, Ferlay J, Siegel RL, Laversanne M, Soerjomataram I, Jemal A, et al. Global cancer statistics 2020: GLOBOCAN estimates of incidence and mortality worldwide for 36 cancers in 185 countries. CA Cancer J Clin 2021; 71(3): 209-49. https://doi.org/10.3322/caac.21660
https://doi.org/10.3322/caac.21660... .

In Brazil, in 2020, there were 98,000 new cases of prostate cancer¹1 Sung H, Ferlay J, Siegel RL, Laversanne M, Soerjomataram I, Jemal A, et al. Global cancer statistics 2020: GLOBOCAN estimates of incidence and mortality worldwide for 36 cancers in 185 countries. CA Cancer J Clin 2021; 71(3): 209-49. https://doi.org/10.3322/caac.21660
https://doi.org/10.3322/caac.21660... . In 2019, in Brazil, it was the second leading cancer-causing death in men, with 15,983 deaths²2 Brasil. Ministério da Saúde. Instituto Nacional de Câncer. Atlas de mortalidade por câncer. Rio de Janeiro: INCA; 2019.. A study that analyzed survival in 71 countries found that in Brazil, this type of cancer had a five-year survival rate of 92.8% during the 2000–2004 quadrennium, 94.8% in 2005–2009 and 94.1% in 2010–2014³3 Allemani C, Matsuda T, Di Carlo V, Harewood R, Matz M, Nikšic´ M, et al. Global surveillance of trends in cancer survival 2000-14 (CONCORD-3): analysis of individual records for 37 513 025 patients diagnosed with one of 18 cancers from 322 population-based registries in 71 countries. Lancet 2018; 391(10125): 1023-75. https://doi.org/10.1016/S0140-6736(17)33326-3
https://doi.org/10.1016/S0140-6736(17)33... .

There are some well-known risk factors for the development of prostate cancer that may explain its incidence, including advanced age (due to their slow growth, small prostate cancers may remain unknown), ethnicity (some studies show that black men have a higher incidence than white men) and hereditary origin (having a family history of prostate cancer increases the risk of developing it)⁴4 Perdana NR, Mochtar CA, Umbas R, Ah Hamid AR. The risk factors of prostate cancer and its prevention: a literature review. Acta Med Indones 2016; 48(3): 228-38. PMID: 27840359,⁵5 Leitzmann MF, Rohrmann S. Risk factors for the onset of prostatic cancer: age, location, and behavioral correlates. Clin Epidemiol 2012; 4: 1-11. https://doi.org/10.2147/CLEP.S16747
https://doi.org/10.2147/CLEP.S16747... .

It should be noted that cancer mortality trends result from previous trends in incidence and survival, and these three indicators are summary measures that provide instantaneous information on a long-term, that is, time-dependent, process. Thus, the joint analysis of the three indicators has the potential to provide a clearer picture of the progress of a particular type of cancer than any isolated measure⁶6 Ellis L, Woods LM, Estève J, Eloranta S, Coleman MP, Rachet B. Cancer incidence, survival and mortality: explaining the concepts. Int J Cancer 2014; 135(8): 1774-82. https://doi.org/10.1002/ijc.28990
https://doi.org/10.1002/ijc.28990... .

The objective of the study was to analyze the incidence, mortality and survival for prostate cancer in the cities of Cuiabá and Várzea Grande, Brazil from 2000 to 2016.

METHODS

This was a study on the incidence, mortality and survival of prostate cancer in the two most populous cities of Mato Grosso State, Cuiabá and Várzea Grande. In 2010, Cuiabá had a population of 551,098 inhabitants (48.8% males), a population density of 157.66 inhab./km² and a human development index (HDI) of 0.785. Várzea Grande, in turn, had a population of 252,596 inhabitants (52.5% males), a population density of 240.98 inhab./km² and an HDI of 0.734⁷7 Brasil. Instituto Brasileiro de Geografia e Estatística. Censo 2010 [Internet]. [acessado em 6 dez. 2021]. Disponível em: https://censo2010.ibge.gov.br/
https://censo2010.ibge.gov.br/... .

The municipalities of Cuiabá and Várzea Grande were selected because of the availability of incidence data that were obtained from the Population-Based Cancer Registry (RCBP) of Cuiabá, considering the period from 2000 to 2016, available on the RCBP system website (BasepopWeb), developed by the José Alencar Gomes da Silva National Cancer Institute (INCA). The data from the Cuiabá RCBP cover Cuiabá and Várzea Grande and those corresponding to the period from 2008 to 2016 were updated through the extension project "Surveillance of Cancer and its associated factors: updating of population-based and hospital records", in partnership with the Mato Grosso State Health Department (SES-MT).

The source of data on deaths that occurred between 2000 and 2017 was the Mortality Information System (SIM), data provided by SES-MT, while the population data were obtained from the Census Demographics of 2000 and 2010, and for the intercensal periods, population estimates obtained from the Information Technology Department of the Unified Health System were used⁷7 Brasil. Instituto Brasileiro de Geografia e Estatística. Censo 2010 [Internet]. [acessado em 6 dez. 2021]. Disponível em: https://censo2010.ibge.gov.br/
https://censo2010.ibge.gov.br/... .

Incidence and mortality rates (per 100,000 inhabitants) for prostate cancer (C61 in chapter II of the 10th edition of the International Statistical Classification of Diseases and Related Health Problems) were calculated for each year between 2000 and 2016. Specific crude rates were obtained for each age group using ten-year intervals and standardized by age, using the direct method, considering the world standard population proposed by Segi⁸8 Segi M. Cancer mortality for selected sites in 24 countries (1950-1957). Sendai: Department of Public Health, Tohoku University, School of Medicine; 1960. and modified by Doll et al.⁹9 Doll R, Payne P, Waterhouse JAH. Cancer incidence in five continents vol. I. Berlin: Springer-Verlag; 1966..

For the analysis of specific five-year survival, new cases of prostate cancer from 2008 to 2012 and related deaths from 2008 to 2017 were considered. The period for men to enter the cohort was from January 1, 2008 to December 31, 2012, with follow-up until December 31, 2017, the date established as the end of the study. These periods were selected on the basis of availability of data from the RCBP and SIM and the possibility of a relationship between them, considering a maximum time of five years between diagnosis and death. The probabilistic relationship of the bases (Figure 1) was carried out with the LinkPlus software, using the variables name of the individual and mother's name, taking into account the first name and date of birth. Deaths from prostate cancer were considered as failure, and loss of follow-up and death from other causes were considered as censure. The five-year survival time in months was obtained by the difference between the date of death and the date of diagnosis of prostate cancer.

Analysis of incidence and mortality trends was with joinpoint regression, using the calendar year as the regression variable. Serial autocorrelation was determined using the Durbin-Watson test, and the model of correlated errors was used for the analysis of incidence, The annual percent change (APC) and average annual percent change (AAPC), i.e., weighted geometric mean of the different APCs with weight equal to the size of the follow-up for each time interval, were calculated¹⁰10 Kim HJ, Fay MP, Feuer EJ, Midthune DN. Permutation tests for joinpoint regression with applications to cancer rates. Stat Med 2000; 19(3): 335-51. https://doi.org/10.1002/(sici)1097-0258(20000215)19:3<335::aid-sim336>3.0.co;2-z
https://doi.org/10.1002/(sici)1097-0258(... ,¹¹11 Clegg LX, Hankey BF, Tiwari R, Feuer EJ, Edwards BK. Estimating average annual per cent change in trend analysis. Stat Med 2009; 28(29): 3670-82. https://doi.org/10.1002/sim.3733
https://doi.org/10.1002/sim.3733... . The analysis by age group was performed from 50 years old or more, because in joinpoint regression, the series cannot have null values. The Kaplan-Meier method was used to determine the probability of specific survival at five years in general and by age group (<50 years; 50 to 59 years; 60 to 69 years; 70 to 79 years; 80 years or more). The hazard ratio (HR) and 95% confidence intervals were estimated using the Cox regression model. The assumption of the Cox model was confirmed by Schoenfeld residuals. Analyses were performed using the Joinpoint Regression Program, version 8.3.6.1 (Statistical Research and Applications Branch, National Cancer Institute, Bethesda, MD. USA) and STATA, version 16.0. A significance level of 5% was adopted.

This study was part of the research project titled "Cancer and its associated factors: analysis of population-based and hospital records", approved by the Ethics Committee of the Hospital Universitário Júlio Muller (CEP-HUJM) under approval No. 3.048.183, of November 20, 2018, and by the Research Ethics Committee of the Mato Grosso State Health Department (SES-MT) under approval No. 3.263.744, of April 12, 2019. The project had the advantage of partnering with the Ministry of Public Work 23rd Region and receiving funding, from July 2019 to July 2023.

RESULTS

In the period from 2000 to 2016, 3,671 new cases of prostate cancer were recorded in the municipalities studied, 74% of which were in Cuiabá. As for the distribution by age group, 2.6% were men under 50 years old, 15.2% for 50 to 59, 37% for 60 to 69, 32% for 70 to 79 and 13.3% for 80 or older. Regarding mortality, there were 892 deaths (68% in Cuiabá), with 0.6% in the 40 to 49 age group, 5.5% in the 50 to 59 group, 21.6% in the 60 to 69 group, 38.2% in the 70 to 79 group and 33.9% for those aged 80 years or over.

The average age-standardized incidence rates of prostate cancer in the period was 87.96 (per 100,000 inhabitants). The highest rates were recorded in 2004 (105.87), 2006 (110.56) and 2007 (107.52), and from 2006 onwards, there has been a steady decline, reaching 59.79 per 100,000 inhabitants in 2016. In the analysis by age group, the highest incidence rates in the period were observed between 60 and 69 years and between 70 and 79 years (Figure 2).

As for mortality, a mean age-standardized rate of 20.22 (per 100,000 inhabitants) was observed, with less variation over the period, from 27.71 in 2000 to 22.93 in 2016 The differences observed between age groups were smaller than those observed for incidence, with much higher values from 60 years onwards (Figure 2).

The age-standardized incidence rate for prostate cancer showed a stable trend until 2006 and a decrease between 2006 and 2016 (APC=-3.2%; 95%CI −6.1–-0.3). In the analysis by age group, there was a downward trend only among those aged 80 years or older and in the period from 2000 to 2016 (APC=-3.0%; 95%CI −5.7–-0.3). The trend of the age-standardized mortality rate, considering all of them, was stable during the period studied. Regarding age groups, only men 60 to 69 years showed an increasing trend between 2000 and 2009 (APC=3.2%; 95%CI 0.2–6.2), followed by stability between 2009 and 2016 (Table 1).

Between 2008 and 2012, 1,203 men were diagnosed with prostate cancer. When followed-up for five years, 234 died from the disease (Figure 1). The specific five-year survival of men diagnosed with prostate cancer in the study period was 79.6% (95%CI 77.2–81.9). The probability of specific survival at five years decreased with increasing age, being 96.3% (95%CI 76.5–99.5) in men younger than 50 years and 46.0% (95%CI 37, 2–54.4) in those aged 80 or over (Figure 3). The risk of death was statistically higher among those aged 70 to 79 years (HR=2.43; 95%CI 1.5–3.9) and 80 years or older (HR=7.20; 95%CI 4.5–11.5) when compared to those 50 to 59 (Table 2).

DISCUSSION

The results of the present study reveal that in the period between 2000 and 2016 in Cuiabá and Várzea Grande, the incidence rate of prostate cancer showed a decreasing trend from 2006 for all ages and among the elderly 80 and over. As for the mortality rate, specifically in the age group 60 to 69 years old, there was an upward trend between 2000 and 2009, but that was not enough to change the general trend of stability observed throughout the series. The specific five-year survival was 79.6% considering all ages and showed a negative association with age, such as lower survival from 70 years onwards.

The mean incidence rate observed in this study (87.96 per 100,000 inhabitants) was similar to that found in more developed regions or countries1,12. According to a systematic review carried out by Dasgupta et al.¹³13 Dasgupta P, Baade PD, Aitken JF, Ralph N, Chambers SK, Dunn J. Geographicalvariations in prostate cancer outcomes: a systematic review of international evidence. Front Oncol 2019; 9: 238. https://doi.org/10.3389/fonc.2019.00238
https://doi.org/10.3389/fonc.2019.00238... , men who live in socially favored and urban areas generally have greater access to the prostate-specific antigen (PSA) test, used for the diagnosis of the disease, which contributes to the increased incidence rates for prostate cancer. This may explain, at least in part, the high incidence rates of prostate cancer in the cities studied, especially among the elderly between 60 and 79 years, since Cuiabá and Várzea Grande are highly urbanized and enjoy greater availability of specialized services and diagnostic support.

Regarding the incidence trend, considering all ages, the rate was decreased from 2006. A study that evaluated the burden of prostate cancer based on data from population-based registries in 13 countries in Central and South America found for Brazil a growing trend of 2.8% between 2003 and 2007, explaining this result as a possible difference in the means of diagnosis, access to health and early detection¹⁴14 Sierra MS, Soerjomataram I, Forman D. Prostate cancer burden in Central and South America. Cancer Epidemiol 2016; 44 Suppl 1: S131-S140. https://doi.org/10.1016/j.canep.2016.06.010
https://doi.org/10.1016/j.canep.2016.06.... . Another study evaluated the temporal trends (from 1980 to 2012) in the incidence of prostate cancer in 44 countries based on population records and found a decrease or stability of rates in many of them, especially in developed countries¹²12 Culp MBB, Soerjomataram I, Efstathiou JA, Bray F, Jemal A. Recent global patterns in prostate cancer incidence and mortality rates. Eur Urol 2020; 77(1): 38-52. https://doi.org/10.1016/j.eururo.2019.08.005
https://doi.org/10.1016/j.eururo.2019.08... . In Brazil, a similar result was found with data from the cancer registry of Goiânia State: the incidence rate of prostate cancer showed a reduction of 4.1% in the period of 2008 to 2012.

For the elderly 80 and older, there was a downward trend in the incidence rate in the period. Analogously to the findings of the present study, Etxeberria et al.¹⁵15 Etxeberria J, Guevara M, Moreno-Iribas C, Burgui R, Delfrade I, Floristan Y, et al. Prostate cancer incidence and mortality in Navarre (Spain). An Sist Sanit Navar 2018; 41(1): 9-15. https://doi.org/10.23938/ASSN.0123
https://doi.org/10.23938/ASSN.0123... , reported for the period of 1975 to 2013, that only men over 75 years old had a reduced incidence rate of prostate cancer. Global estimates show that across all age groups, the incidence began to decline in 2008, with the biggest drop between 2011 and 2012, which might have been associated with reduced PSA¹1 Sung H, Ferlay J, Siegel RL, Laversanne M, Soerjomataram I, Jemal A, et al. Global cancer statistics 2020: GLOBOCAN estimates of incidence and mortality worldwide for 36 cancers in 185 countries. CA Cancer J Clin 2021; 71(3): 209-49. https://doi.org/10.3322/caac.21660
https://doi.org/10.3322/caac.21660... screening. Also, in a study carried out in Estonia (1995–2014), it was observed that most of those diagnosed with prostate cancer were between 65 and 74 years old, and that the incidence of cancer increased until 2011, stabilizing in the following years, probably thanks to increased PSA testing¹⁶16 Innos K, Baburin A, Kotsar A, Eiche IE, Lang K. Prostate cancer incidence, mortality and survival trends in Estonia, 1995-2014. Scand J Urol 2017; 51(6): 442-9. https://doi.org/10.1080/21681805.2017.1392600
https://doi.org/10.1080/21681805.2017.13... .

However, there is no consensus on whether the PSA test is indicated as a screening strategy for prostate cancer since studies demonstrate an imbalance between the possible risks and benefits of performing this test¹⁷17 Instituto Nacional de Câncer José Alencar Gomes da Silva. Detecção precoce do câncer. Rio de Janeiro: INCA: 2021. Disponível em: https://www.inca.gov.br/sites/ufu.sti.inca.local/files//media/document//deteccao-precoce-do-cancer.pdf
https://www.inca.gov.br/sites/ufu.sti.in... –¹⁹19 Modesto AADA, Lima RLB, D’Angelis AC, Augusto DK. Um novembro não tão azul: debatendo rastreamento de câncer de próstata e saúde do homem. Interface (Botucatu) 2018; 22(64): 251-62. https://doi.org/10.1590/1807-57622016.0288
https://doi.org/10.1590/1807-57622016.02... . In Brazil, INCA does not recommend the use of PSA for screening, and if the man wishes to have this test done, individual circumstances and professional opinion must be observed, highlighting the benefits and harms of this strategy¹⁷17 Instituto Nacional de Câncer José Alencar Gomes da Silva. Detecção precoce do câncer. Rio de Janeiro: INCA: 2021. Disponível em: https://www.inca.gov.br/sites/ufu.sti.inca.local/files//media/document//deteccao-precoce-do-cancer.pdf
https://www.inca.gov.br/sites/ufu.sti.in... .

The nature of the mortality rate in the cities studied differs from that observed in all of Brazil in the period of 1980 to 2010, in which the mortality rate from prostate cancer showed an upward trend²⁰20 Conceição MBM, Boing AF, Peres KG. Time trends in prostate cancer mortality according to major geographic regions of Brazil: an analysis of three decades. Cad Saúde Pública 2014; 30(3): 559-66. https://doi.org/10.1590/0102-311X00005813
https://doi.org/10.1590/0102-311X0000581... . A similar pattern of stability was observed in other early series, such as those from 1996 and 2006²¹21 Jerez-Roig J, Souza DLB, Medeiros PFM, Barbosa IR, Curado MP, Costa ICC, et al. Future burden of prostate cancer mortality in Brazil: a population-based study. Cad Saúde Pública 2014; 30(11): 2451-8. https://doi.org/10.1590/0102-311X00007314
https://doi.org/10.1590/0102-311X0000731... and from 1990 to 2015²²22 Guerra MR, Bustamante-Teixeira MT, Corrêa CSL, Abreu DMX, Curado MP, Mooney M, et al. Magnitude e variação da carga da mortalidade por câncer no Brasil e Unidades da Federação, 1990 e 2015. Rev Bras Epidemiol 2017; 20. Suppl 1: 102-17. https://doi.org/10.1590/1980-5497201700050009
https://doi.org/10.1590/1980-54972017000... . In the Central-West region, for the set of inland municipalities, a growing trend was observed in the period of 1980 to 2017 and a drop in rates for the capitals between 1997 and 2017²³23 Azevedo e Silva G, Jardim BC, Ferreira VM, Junger WL, Girianelli VR. Cancer mortality in the capitals and in the interior of Brazil: a four-decade analysis. Rev Saúde Pública 2020; 54: 126. https://doi.org/10.11606/s1518-8787.2020054002255
https://doi.org/10.11606/s1518-8787.2020... . Differences in mortality trends can be attributed to methodologies used to calculate rates, such as the redistribution of ill-defined causes²⁰20 Conceição MBM, Boing AF, Peres KG. Time trends in prostate cancer mortality according to major geographic regions of Brazil: an analysis of three decades. Cad Saúde Pública 2014; 30(3): 559-66. https://doi.org/10.1590/0102-311X00005813
https://doi.org/10.1590/0102-311X0000581... –²³23 Azevedo e Silva G, Jardim BC, Ferreira VM, Junger WL, Girianelli VR. Cancer mortality in the capitals and in the interior of Brazil: a four-decade analysis. Rev Saúde Pública 2020; 54: 126. https://doi.org/10.11606/s1518-8787.2020054002255
https://doi.org/10.11606/s1518-8787.2020... .

In the world, the temporal trend of reduced mortality from this type of cancer has been observed in high-development countries, such as Ireland, France and Australia (-5%) and Germany and the United Kingdom (-2.0%)¹²12 Culp MBB, Soerjomataram I, Efstathiou JA, Bray F, Jemal A. Recent global patterns in prostate cancer incidence and mortality rates. Eur Urol 2020; 77(1): 38-52. https://doi.org/10.1016/j.eururo.2019.08.005
https://doi.org/10.1016/j.eururo.2019.08... . These decreases have been associated, above all, with early detection and advances in forms of treatment (radical prostatectomy for localized tumors and increased hormone therapy, among others) and greater access to them. However, the contribution of PSA screening in reducing mortality is still controversial, as PSA level tends to increase in benign prostatic hyperplasia and not only in prostate cancer. In addition, PSA results are heterogeneous, and there is no unanimity in its use by the medical community¹³13 Dasgupta P, Baade PD, Aitken JF, Ralph N, Chambers SK, Dunn J. Geographicalvariations in prostate cancer outcomes: a systematic review of international evidence. Front Oncol 2019; 9: 238. https://doi.org/10.3389/fonc.2019.00238
https://doi.org/10.3389/fonc.2019.00238... ,¹⁷17 Instituto Nacional de Câncer José Alencar Gomes da Silva. Detecção precoce do câncer. Rio de Janeiro: INCA: 2021. Disponível em: https://www.inca.gov.br/sites/ufu.sti.inca.local/files//media/document//deteccao-precoce-do-cancer.pdf
https://www.inca.gov.br/sites/ufu.sti.in... –¹⁹19 Modesto AADA, Lima RLB, D’Angelis AC, Augusto DK. Um novembro não tão azul: debatendo rastreamento de câncer de próstata e saúde do homem. Interface (Botucatu) 2018; 22(64): 251-62. https://doi.org/10.1590/1807-57622016.0288
https://doi.org/10.1590/1807-57622016.02... .

For the age group 60 to 69 years, there was an inflection point in the trend of the mortality rate from prostate cancer, which showed a rise from 2000 to 2009 and stability from 2009 to 2016, and for the other age groups, there was stability. A result different from that observed for the whole of Brazil and for the Central-West region in the period of 1980 to 2010²⁰20 Conceição MBM, Boing AF, Peres KG. Time trends in prostate cancer mortality according to major geographic regions of Brazil: an analysis of three decades. Cad Saúde Pública 2014; 30(3): 559-66. https://doi.org/10.1590/0102-311X00005813
https://doi.org/10.1590/0102-311X0000581... , which showed a growing trend for all age groups from 60 years onwards. The improvement in the mortality indicator for this age group may indicate an improvement in access to early cancer diagnosis and treatment at an early stage. A study carried out in the Central-West region²⁴24 Silva JFS, Silva AMC, Lima-Luz L, Aydos RD, Mattos IE. Correlação entre produção agrícola, variáveis clínicas-demográficas e câncer de próstata: um estudo ecológico. Ciênc Saúde Coletiva 2015; 20(9): 2805-12. https://doi.org/10.1590/1413-81232015209.00582015
https://doi.org/10.1590/1413-81232015209... between 2005 and 2009 found a negative correlation between prostate cancer mortality rate and the proportion of the population that had annual medical check-ups and the proportion of the population covered by health insurance, which may somehow reflect the better coverage of the health care network and access.

Despite the stability, it is noteworthy that the mortality rate level was similar to that observed in less developed regions¹1 Sung H, Ferlay J, Siegel RL, Laversanne M, Soerjomataram I, Jemal A, et al. Global cancer statistics 2020: GLOBOCAN estimates of incidence and mortality worldwide for 36 cancers in 185 countries. CA Cancer J Clin 2021; 71(3): 209-49. https://doi.org/10.3322/caac.21660
https://doi.org/10.3322/caac.21660... ,¹²12 Culp MBB, Soerjomataram I, Efstathiou JA, Bray F, Jemal A. Recent global patterns in prostate cancer incidence and mortality rates. Eur Urol 2020; 77(1): 38-52. https://doi.org/10.1016/j.eururo.2019.08.005
https://doi.org/10.1016/j.eururo.2019.08... and exceeds that observed for the Central-West Region in the period of 2000 to 2011 and for the State of Mato Grosso between 2000 and 2011²⁰20 Conceição MBM, Boing AF, Peres KG. Time trends in prostate cancer mortality according to major geographic regions of Brazil: an analysis of three decades. Cad Saúde Pública 2014; 30(3): 559-66. https://doi.org/10.1590/0102-311X00005813
https://doi.org/10.1590/0102-311X0000581... . Higher mortality rates from prostate cancer may reflect, among other factors, the underlying incidence trends, the influence of harmful health behaviors and the precariousness of the cancer care network for the population in general⁴4 Perdana NR, Mochtar CA, Umbas R, Ah Hamid AR. The risk factors of prostate cancer and its prevention: a literature review. Acta Med Indones 2016; 48(3): 228-38. PMID: 27840359,⁵5 Leitzmann MF, Rohrmann S. Risk factors for the onset of prostatic cancer: age, location, and behavioral correlates. Clin Epidemiol 2012; 4: 1-11. https://doi.org/10.2147/CLEP.S16747
https://doi.org/10.2147/CLEP.S16747... ,²⁵25 Silva JFS, Mattos IE, Aydos RD. Tendência de mortalidade por câncer de próstata nos estados da região centro-oeste do Brasil, 1980–2011. Rev Bras Epidemiol 2014; 17(2): 395-406. https://doi.org/10.1590/1809-4503201400020009
https://doi.org/10.1590/1809-45032014000... . Considering the local reality, it is possible that the stability of the mortality rate at higher levels is associated with the difficulties of diagnosis and treatment and the precariousness of the care network, which still shows structural problems, which can hinder the time needed for treatment²²22 Guerra MR, Bustamante-Teixeira MT, Corrêa CSL, Abreu DMX, Curado MP, Mooney M, et al. Magnitude e variação da carga da mortalidade por câncer no Brasil e Unidades da Federação, 1990 e 2015. Rev Bras Epidemiol 2017; 20. Suppl 1: 102-17. https://doi.org/10.1590/1980-5497201700050009
https://doi.org/10.1590/1980-54972017000... ,²³23 Azevedo e Silva G, Jardim BC, Ferreira VM, Junger WL, Girianelli VR. Cancer mortality in the capitals and in the interior of Brazil: a four-decade analysis. Rev Saúde Pública 2020; 54: 126. https://doi.org/10.11606/s1518-8787.2020054002255
https://doi.org/10.11606/s1518-8787.2020... .

The specific survival of prostate cancer in Cuiabá and Várzea Grande was higher than that observed in all of Brazil, that is 70%, according to data from Brazil's National Oncology Base (Base Onco) from 2002 to 2003 and in the different regions: South (62%), Central-West (68%), North and Northeast (71% in both) and Southeast (72%)²⁶26 Braga SFM, Souza MC, Oliveira RR, Andrade EIG, Acurcio FA, Cherchiglia ML. Patient survival and risk of death after prostate cancer treatment in the Brazilian Unified Health System. Rev Saúde Pública 2017; 51(0): 46. https://doi.org/10.1590/S1518-8787.2017051006766
https://doi.org/10.1590/S1518-8787.20170... . In developed countries, such as the United States, net survival up to five years after diagnosis was 96.7%²⁷27 Steele CB, Li J, Huang B, Weir HK. Prostate cancer survival in the United States by race and stage (2001-2009): findings from the CONCORD-2 study. Cancer 2017; 123 Suppl 24(Suppl 24): 5160-77. https://doi.org/10.1002/cncr.31026
https://doi.org/10.1002/cncr.31026... , and survival in the 2010–2014 quadrennium was 90.2% in Austria and 93.6% in Canada²⁸28 Coleman MP, Quaresma M, Berrino F, Lutz JM, De Angelis R, Capocaccia R, et al. Cancer survival in five continents: a worldwide population-based study (CONCORD). Lancet Oncol 2008; 9(8): 730-56. https://doi.org/10.1016/S1470-2045(08)70179-7
https://doi.org/10.1016/S1470-2045(08)70... . This result can be attributed to advances in the diagnosis and treatment of prostate cancer, which may result in a higher cure rate or survival time.

In a population-based cohort study conducted in central Denmark, the estimated five-year survival was 65% and, when assessing the age group, a reduction in this indicator was noted from 70–79 years onwards²⁹29 Nguyen-Nielsen M, Nørgaard M, Jacobsen JB, Borre M, Thomsen RW, Søgaard M. Comorbidity and survival of Danish prostate cancer patients from 2000-2011: a population-based cohort study. Clin Epidemiol 2013; 5(Suppl 1): 47-55. https://doi.org/10.2147/CLEP.S47153
https://doi.org/10.2147/CLEP.S47153... . Regarding age, it is known that the higher the age group, the greater the risk of developing cancer and having a worse prognosis of survival. Likewise, when analyzing the age group, a study carried out in the United States based on the Surveillance, Epidemiology, and End Results Program (SEER) database, with 24,054 patients, observed that the worst survival results were found in men 65 or over³⁰30 Zheng Z, Zhou Z, Yan W, Zhou Y, Chen C, Li H, et al. Tumor characteristics, treatments, and survival outcomes in prostate cancer patients with a PSA level <4 ng/ml: a population-based study. BMC Cancer 2020; 20(1): 340. https://doi.org/10.1186/s12885-020-06827-z
https://doi.org/10.1186/s12885-020-06827... . In addition, other studies also show that the greater the age, the lower the probability of patient survival³¹31 Huang TB, Zhou GC, Dong CP, Wang LP, Luan Y, Ye JT, et al. Marital status independently predicts prostate cancer survival in men who underwent radical prostatectomy: an analysis of 95,846 individuals. Oncol Lett 2018; 15(4): 4737-44. https://doi.org/10.3892/ol.2018.7964
https://doi.org/10.3892/ol.2018.7964... –³³33 Xing Y, Meng Q, Sun L, Chen X, Cai L. Survival analysis of patients with unilateral and bilateral primary breast cancer in Northeast China. Breast Cancer 2015; 22(5): 536-43. https://doi.org/10.1007/s12282-014-0517-3
https://doi.org/10.1007/s12282-014-0517-... .

Survival is the parameter used to evaluate the results of cancer diagnosis and treatment, with observations obtained from health records. Although in Brazil there is little information available about survival in cancer patients, survival studies are important in assessing the distribution of resources and in identifying the main prognostic factors in a given region and population³⁴34 Freitas Júnior R, Nunes RD, Martins E, Curado MP, Freitas NMA, Soares LR, et al. Prognostic factors and overall survival of breast cancer in the city of Goiania, Brazil: a population-based study. Rev Col Bras Cir 2017; 44(5): 435-43. https://doi.org/10.1590/0100-69912017005003
https://doi.org/10.1590/0100-69912017005... .

As limitations of the research, we point out the lack of population-based data on staging at the time of diagnosis of prostate tumors in the state of Mato Grosso, which could raise hypotheses about early detection and advances in the treatment of the disease. Furthermore, the absence of information on the life table for the municipalities of Cuiabá and Várzea Grande made it impossible to calculate net survival³⁵35 Perme MP, Stare J, Estève J. On estimation in relative survival. Biometrics 2012; 68(1): 113-20. https://doi.org/10.1111/j.1541-0420.2011.01640.x
https://doi.org/10.1111/j.1541-0420.2011... ,³⁶36 Spika D, Rachet B, Bannon F, Woods LM, Maringe C, Bonaventure A, Coleman MP, Allemani C. Life tables for the CONCORD programme. Available from: http://csg.lshtm.ac.uk/life-tables
http://csg.lshtm.ac.uk/life-tables... .

The coverage and quality of SIM data have improved over the years³⁷37 Brasil. Ministério da Saúde. Secretaria de Vigilância em Saúde. Departamento de Vigilância de Doenças e Agravos Não Transmissíveis e Promoção da Saúde. Saúde Brasil 2014: uma análise da situação de saúde e das causas externas. Brasília: Ministério da Saúde; 2015. Disponível: https://bvsms.saude.gov.br/bvs/publicacoes/saude_brasil_2014_analise_situacao.pdf
https://bvsms.saude.gov.br/bvs/publicaco... ,³⁸38 Brasil. Ministério da Saúde. Secretaria de Vigilância em Saúde. Departamento de Vigilância de Doenças e Agravos Não Transmissíveis e Promoção da Saúde. Saúde Brasil estados 2018: uma análise de situação de saúde segundo o perfil de mortalidade dos estados brasileiros e do Distrito Federal. Brasília: Ministério da Saúde; 2018. Disponível: https://bvsms.saude.gov.br/bvs/publicacoes/saude_brasil_estados_2018_analise_situacao_saude_mortalidade.pdf
https://bvsms.saude.gov.br/bvs/publicaco... . In Cuiabá and Várzea Grande, ill-defined causes accounted for 4.76% of all deaths, rising from 9.51% in 2000 to 2.73% in 2016; in addition, their distribution was similar between age groups³⁹39 Brasil. Ministério da Saúde. DATASUS. Estatísticas vitais. Sistema de Informação sobre mortalidade [Internet] [acessado em 6 dez. 2021]. Disponível em: https://datasus.saude.gov.br/estatisticas-vitais/
https://datasus.saude.gov.br/estatistica... . For prostate cancer, the Cuiabá RCBP showed, for all the years analyzed, a microscopic verification greater than 70% and a percentage of cases registered only by the death certificate less than 20%, according to the International Agency for Cancer Registry⁴⁰40 Curado MP, Edwards B, Shin HR, Storm H, Ferlay J, Heanue M, et al. Cancer incidence in five continents vol IX. Lyon: International Agency for Research on Cancer; 2007. Disponível em: https://publications.iarc.fr/Book-And-Report-Series/Iarc-Scientific-Publications/Cancer-Incidence-In-Five-Continents-Volume-IX-2007
https://publications.iarc.fr/Book-And-Re... .

In the period from 2000 to 2016, there was a fluctuation in incidence rates, which might have been related to data quality, differences in diagnostic practice and death certification procedures¹⁴14 Sierra MS, Soerjomataram I, Forman D. Prostate cancer burden in Central and South America. Cancer Epidemiol 2016; 44 Suppl 1: S131-S140. https://doi.org/10.1016/j.canep.2016.06.010
https://doi.org/10.1016/j.canep.2016.06.... ,⁴¹41 Bray F, Znaor A, Cueva P, Korir A, Swaminathan R, Ullrich A, et al. Chapter 5. Quality control at the population- based cancer registry. In: Bray F, Znaor A, Cueva P, Korir A, Swaminathan R, Ullrich A, et al. Planning and developing population-based cancer registration in low- or middle-income Settings. In: Lyon: International Agency for Research on Cancer; 2014. p. 21-5.. Improvements in the coverage and quality of the RCPB and SIM are needed to provide robust statistics on the cancer burden.

The present study only evaluated age, but other factors also explain incidence, mortality and survival, such as ethnicity, heredity, marital status, place of residence and type of treatment⁴²42 Migowski A, Azevedo e Silva G. Sobrevida e fatores prognósticos de pacientes com câncer de próstata clinicamente localizado. Rev Saúde Pública 2010; 44(2): 344- 52. https://doi.org/10.1590/S0034-89102010000200016
https://doi.org/10.1590/S0034-8910201000... –⁴⁵45 Beksisa J, Getinet T, Tanie S, Diribi J, Hassen HY. Survival and prognostic determinants of prostate cancer patients in Tikur Anbessa Specialized Hospital, Addis Ababa, Ethiopia: a retrospective cohort study. PLoS One 2020; 15(3): e0229854. https://doi.org/10.1371/journal.pone.0229854
https://doi.org/10.1371/journal.pone.022... . Despite the limitations, the relevance of using a recent historical series and the possibility of simultaneously evaluating the indicators of incidence, survival and mortality are not extinguished.

This study made it possible to describe the decreasing trend in the incidence and the stability of mortality and also to estimate the survival of men with prostate cancer in Cuiabá and Várzea Grande. It was possible to identify that the age groups 60 to 69 years and 70 to 79 years were the ones with the highest incidence and mortality rates, respectively. In turn, those aged 70 years and over had the worst survival probability. Knowledge of incidence, mortality and survival contributes to understanding the magnitude of cancer and to targeting prostate cancer prevention and control measures.

ACKNOWLEDGMENTS

To the Coordination for the Improvement of Higher Education Personnel, the master's scholarships granted to Flávio de Macêdo Evangelista and Viviane Cardozo Modesto; to the Mato Grosso State Health Department (SES-MT) and the Ministry of Labor, 23rd Region for the financial support of the project; to the José Alencar Gomes da Silva National Cancer Institute (INCA) for its contribution to the training of cancer registrars.

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