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. 2011 May 9;13(4):574–578. doi: 10.1038/aja.2010.126

Prostate cancer: an emerging threat to the health of aging men in Asia

Ling Zhang 1, Bao-Xue Yang 1, Hai-Tao Zhang 2, Jin-Guo Wang 1,3, Hong-Liang Wang 1,3, Xue-Jian Zhao 1,3
PMCID: PMC3739604  PMID: 21552284

Abstract

The aim of this study was to determine and examine the possible reasons for the difference in prostate cancer incidence between Asian men and North American men by literature review. Data regarding cancer incidence and mortality were obtained from the database of the International Agency for Research on Cancer (IARC). A literature review was conducted by studying related articles published in peer-reviewed journals such as the The New England Journal of Medicine, Journal of Clinical Oncology, A Cancer Journal for Clinicians and Asian Journal of Andrology. To evaluate the early diagnosis and survival rates, the mortality-to-incidence rate ratio (MR/IR) was calculated from the IARC data. By comparing prostate cancer data between Asian men and North American men, we found that differences in the incidence rate and MR/IR could be attributed largely to a lack of annual prostate cancer screening with serum prostate-specific antigen (PSA) in most Asian countries. It is likely that PSA screening also contributes significantly to the differences in prostate cancer mortality rates. Prostate cancer has the highest incidence rate among five common malignancies in Asian Americans. However, the MR/IR ratio of prostate cancer is the lowest among cancers. These data seem to further support the usefulness of PSA screening, even though the percentage of low risk cancers is greater in prostate cancer than in other cancers. The low incidence rate of prostate cancer does not reflect the actual statistics of this disease in Asia. The data from limited institutions in many Asian countries seem to bias the true incidence and mortality rates. To improve this situation, incorporating PSA screening for prostate cancer, as well as constructing a nationwide cancer registration system, will be helpful.

Keywords: Incidence, mortality, prostate cancer, prostate-specific antigen

Introduction

The trend of an aging population presents a serious socioeconomic problem in Asian countries. The population over 60 years old in Asia is about four times greater compared to those of North America and Europe.1 Thus, health problems will be a greater burden in Asian countries despite rapid socioeconomic growth. Cancer is commonly associated with aging, and early diagnosis is the only way to improve treatment results and lower cancer mortality. For example, the 5-year survival rate of patients with prostate cancer when diagnosed and treated in the early stages is nearly 99%.2

Prostate cancer is diagnosed mostly in men above 50 years of age. However, the incidence and mortality rates of prostate cancer are very low in Asian men, and so it has not been considered a major threat in this population. According to the 2002 data from the International Agency for Research on Cancer (IARC), the United States had the highest prostate cancer incidence rate in the world at 124.8/105 person year (PY).

The incidence rate of prostate cancer in China was 1.6/105 PY, which ranked 170th. Other countries in Asia, including Japan (12.6/105 PY, 114th), Korea (7.6/105 PY, 134th) and Vietnam (2.8/105 PY, 161st), were also reported as having low incidence rates.3 Such a large difference in the prostate cancer incidence rate between North America and Asia cannot be entirely explained by variations in diet, race and environmental factors,4, 5 and this fact is a cause of concern for many researchers.

The difference in prostate cancer incidence rates between North American and Asian men could be due to a difference in prostate-specific antigen (PSA) screening prevalence

In 2006, Kamangar et al.6 described the overall cancer incidence, mortality and prevalence of lung, breast, colon and rectum, stomach, prostate, liver, cervix and oesophageal cancer in selected geographic regions of the world using GLOBOCAN (2002) and five-continent databases from the IARC. The incidence rate of prostate cancer in North America (119.9/105 PY) was nearly 25.5 times higher than that of Asia (4.7/105 PY). However, the mortality rate of prostate cancer in North America was only 5.9 times higher than that in Asia (15.8/105 PY versus 2.7/105 PY). The authors stated that the enormous difference between the two continents could not be explained by variations in diet and race, and they concluded that annual screening for prostate cancer with a serum PSA measurement in men of 50 years or older in North America is likely another significant contributing factor. The authors used the mortality-to-incidence rate ratio (MR/IR) as an indirect index for the evaluation of survival and early diagnosis. The MR/IR ratio was 0.13 in North America. This means that that there were 13 deaths for every 100 newly diagnosed prostate cancer patients. The MR/IR in Asia was 0.57. The small value for MR/IR in North America may provide further supporting evidence that vigorous annual screening with PSA is feasible and may reduce prostate cancer mortality.

The worldwide prostate cancer MR/IR ratios from IARC decreased markedly from 2002 to 2008.3, 7 As shown in Table 1 and Figure 1, new prostate cancer cases worldwide have increased from 679 060 to 914 000 during this period. Prostate cancer incidence rate has increased from 25.3/105 to 28.5/105 PY, while mortality rate has decreased from 8.2/105 to 7.5/105 PY. The MR/IR ratio has decreased from 0.32 to 0.26. The prostate cancer incidence rate in North America has decreased from 119.9/105 to 85.7/105 PY, and the mortality rate has decreased from 15.8/105 to 9.9/105 PY, accompanied with a decrease in the MR/IR ratio from 0.13 to 0.12. Of all the continents, Europe had the most remarkable change. The prostate cancer incidence rate increased from 40.0/105 PY in 2002 to 61.4/105 PY in 2008. However, the mortality rate decreased from 14.2/105 to 12.1/105 PY and the MR/IR ratio decreased from 0.36 to 0.20. This remarkable progress could be attributed to the European Randomized Study of Screening for Prostate Cancer.8 Although Asia and Africa have made some improvements in mortality rates and MR/IR ratios, the changes are modest compared to other continents.

Table 1. Worldwide age-standardized incidence rates, mortality rates and mortality-to-incidence rate ratios (2008)7.

  Cases Incidence rate (cases/105 PY) Death Mortality rate (cases/105 PY) MR/IR ratio
World 913 770 28.5 258 381 7.5 0.26
North America 213 705 85.7 32 591 9.9 0.12
Oceania 21 428 94.5 4294 15.3 0.16
Europe 385 440 61.4 89 908 12.1 0.20
South America 84 111 50.2 29 274 16.2 0.32
Asia 133 171 7.2 59 643 3.2 0.44
Africa 39 460 17.5 28 006 12.5 0.71
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Abbreviation: MR/IR, mortality-to-incidence rate ratio.

Figure 1.

Figure 1

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Worldwide age-standardized incidence rates, mortality rates and mortality-to-incidence rate ratios.7 MR/IR, mortality-to-incidence rate ratio.

Reasons for the low incidence and high MR/IR ratio of prostate cancer in Asia

As showed in Table 1, the prostate cancer incidence rate in Asia was 7.2/105 PY, and the mortality rate was 3.2/105 PY, which were markedly lower than that of other continents. The MR/IR ratio (0.44) was significantly higher than that of other continents, except for Africa. These results indicate that prostate cancer in Asia may be very small in number, but it is a very high risk disease when compared with that in other continents. However, do these results reflect reality?

Age-standardized incidence rates, mortality rates and MR/IR ratios in Asia

The data in Table 2 come from the IARC databases.7 The MR/IR ratios in Japan, Korea and Singapore had decreased to 0.22, 0.18 and 0.20, respectively, which were very close to those in Europe (0.20) and North America (0.12). In Japan, the early diagnosis of prostate cancer started a relatively long time ago, and Japanese urologists pay attention to and take an active part in the early diagnosis and treatment of prostate cancer.9 In 2008, the incidence rate of prostate cancer in China was 4.3/105 PY, much higher than that in 2002 (1.6/105 PY). Meanwhile, the mortality rate decreased from 0.62 to 0.42. These results demonstrate that prostate cancer can be detected at an early stage and that treatment can be effectively performed.10 However, it should be noted here that the incidence and mortality rate data mostly came from limited clinical institutes and not from mass screening results. In Philippines, Vietnam and Malaysia, the MR/IR ratios were over 0.50. It may be shown in these countries that prostate cancer is only diagnosed at late clinical stages. In a late cancer stage, life expectancy and quality of life are considered poor.

Table 2. Age-standardized incidence rates, mortality rates and mortality-to-incidence rate ratios in Asia (2008)7.

  Cases Incidence rate (cases/105 PY) Death Mortality rate (cases/105 PY) MR/IR ratio
China 33 802 4.3 14 297 1.8 0.42
Japan 38 619 22.7 9989 5.0 0.22
Korea 6382 22.4 1204 4.1 0.18
Singapore 616 20.0 125 3.9 0.20
Philippines 2491 10.1 1290 5.3 0.52
Vietnam 1208 3.2 716 1.9 0.59
Malaysia 821 9.2 508 5.8 0.63
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Abbreviation: MR/IR, mortality-to-incidence rate ratio.

The incidence rates of prostate cancer among Asian Americans are not low

In 2007, McCracken et al.11 compared prostate cancer incidence and mortality rates for ethnic groups of Asian Americans with those of non-Hispanic whites. The data were provided by the Los Angeles Cancer Surveillance Program and the California Cancer Registry from 2000 to 2002. The incidence rate among non-Hispanic whites was 159.9/105 PY. Among all Asian ethnic groups, Filipino Americans had the highest incidence rates (113.3/105 PY). The incidence rates of Japanese Americans, Chinese Americans and Vietnamese Americans were 103.4/105, 80.4/105 and 65.4/105 PY, respectively. Korean Americans had the lowest incidence rate (51.0/105 PY). There were obviously some differences between Asian Americans and non-Hispanic whites, which might truly be associated with variations in race and lifestyle, particularly dietary differences.12, 13 Furthermore, the incidence rates among Asian Americans were significantly higher than the average level (4.7/105 PY) in Asian men living in their homeland.11 The MR/IR ratio is probably the most valuable indicator of cancer survival and an early diagnosis. As stated previously, the prostate cancer incidence rate (51.0–113.3/105 PY) varied significantly among the Asian American ethnic groups; however, MR/IR ratios (0.111–0.146) were lower than that of non-Hispanic white men (0.169). These results indicate that the incidence and mortality rates of Asian people are expected to be greatly improved, even in their homeland, by increasing PSA screening.

The comparison of incidence rates and MR/IR ratios of five malignant tumours among Asian Americans

McCracken et al.11 calculated MR/IR ratios based on the incidence and mortality rate data of five malignant tumours (Table 3). Despite the fact that prostate cancer was the most commonly diagnosed cancer among Asian American men, except for Korean and Vietnamese Americans, the MR/IR ratios of prostate cancer were significantly lower than those of lung, liver, stomach and colon/rectal cancers. All five malignant tumours could be detected by mass screening, but why were the MR/IR ratios of prostate cancer lower than that of the other four cancers? PSA is secreted by the prostate gland epithelial cell and is a tissue-specific antigen of the prostate. Adenocarcinoma cells have the ability to secrete PSA into interstitial fluid and elevate the serum PSA level. Because the prostate gland is of parenchymatous organ, prostate cancer can be diagnosed easily and safely by ultrasound-guided systematic biopsy. PSA mass screenings annually performed in North America have increased patient diagnoses at early stages and facilitated efficient treatment. One study has demonstrated that the 5-year survival rate of clinically localized prostate cancer reaches 99%.2 Although lung, liver, stomach and colon/rectum cancers have their respective markers, they are generally useful only at advanced clinical stages. These cancers can be diagnosed mainly by imaging procedures such as X-ray examinations including computed tomography, magnetic resonance imaging or endoscopic examination. Systematic multiple biopsies, as performed in the prostate, are usually not suitable for a secondary examination. In addition, prostate cancer is generally slow growing in nature compared to other cancers, especially low-risk cancers with a PSA <10 ng ml−1 and a Gleason score <7, which seems to the reason that the four other cancers are diagnosed at a later clinical stage compared to prostate cancer.

Table 3. The comparison of age-adjusted incidence rates, mortality rates and mortality-to-incidence ratios for five kinds of cancers between Asia Americans and white Americans (per 100 000)11.

    Chinese Filipino Vietnamese Korean Japanese Non-Hispanic white
Prostate cancer IR 80.4 113.3 65.4 51.0 103.4 159.9
  MR 8.9 15.7 9.1 7.1 15.1 27.0
  MR/IR 0.11 0.14 0.14 0.15 0.14 0.17
Lung cancer IR 52.3 71.9 72.8 56.3 41.1 77.9
  MR 46.6 49.8 47.2 52.3 36.0 64.0
  MR/IR 0.89 0.69 0.65 0.93 0.88 0.82
Colon/rectum cancer IR 52.2 48.4 39.1 57.8 57.8 57.8
  MR 18.2 16.6 11.1 19.1 27.1 21.3
  MR/IR 0.35 0.34 0.28 0.34 0.42 0.36
Stomach cancer IR 18.3 7.2 28.1 54.6 27.0 9.5
  MR 14.1 4.1 15.5 35.2 18.1 5.0
  MR/IR 0.77 0.57 0.55 0.65 0.67 0.53
Liver cancer IR 23.3 16.8 54.3 33.7 9.3 6.8
  MR 19.9 12.0 35.5 26.6 8.3 6.0
  MR/IR 0.85 0.71 0.65 0.79 0.89 0.88
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Prevalence of PSA screening in men over 50 years old is imperative in Asian countries

The analysis of prostate cancer incidence rates and the MR/IR ratios suggests that the incidence rates were not in fact low in the Asian population. The fact that MR/IR ratios were significantly lower in Asian Americans than in white Americans suggests that the prevalence of PSA screening will make it possible to detect prostate cancer at early stages and treat the disease efficiently in Asian countries. In addition, our group has conducted a PSA-based prostate cancer screening in men over 50 years old in Changchun, China. The results showed that the overall prostate cancer detection rate in this cohort was 1.7%. However, cases with Gleason scores 8–10 accounted for 34% of all prostate cancer cases.10, 14, 15, 16 Our data suggest that the prostate cancer incidence rate in China would be almost equivalent to those of Europe and the United States; prostate cancer is prevalent in developing Asian countries and the mortality risk can no longer be ignored. Furthermore, the data suggest that the rate of high-risk patients may be variable and dependent on lifestyle and/or ethnic background from country to country.

Prostate cancers with Gleason scores ≤6 are classified as well-differentiated cancers. This kind of prostate cancer has the lowest invasive potential, often forms a carcinoma nodus and develops slowly. When the carcinoma nodus grows into the urethra, it will result in difficult urination, which forces the patient to the hospital. However, if difficult urination is due to the cancer, it is likely at an advanced stage and the best opportunity for treatment may have been lost. These are the prostate cancer patients that urologists can usually detect in the clinic. Some urologists in China look at prostate cancer as a very slow-growing cancer that is not life threatening in nature. These traditional views sometimes result in mismanagement and allow the cancer to metastasize.

Prostate cancers with Gleason scores ≥8 have highly invasive abilities, and micrometastases are often present even at an early stage.17 Prostate cancer cells of this type will demonstrate the ability for infiltrative growth into the interstitial space instead of forming a carcinoma nodus that often oppresses the urethra. In such cases, patients will not have any genitourinary symptoms leading them to visit an urologist even in advanced stages until metastases symptoms develop. An early stage cancer generally shows no symptoms; therefore, in order to detect the cancer early, a mass screening system is important. Measurement of the serum PSA has been recognized worldwide as a safe and cost-effective method for detecting prostate cancer, and it is the only effective method to detect prostate cancer at an early stage. The percentage of prostate cancers with a Gleason score ≥8 was 34% according to data from the PSA mass screening in Changchun, China.16 Stamey et al.18 also showed that the percentages of tumours with a Gleason score ≥8 during four successive 5-year periods were 30.89%, 26.82%, 28.00% and 35.03%, respectively, from 1983 to 1988. These results indicate that PSA screening can result in the early diagnosis and treatment of prostate cancer as well as the detection of early stage cancer, but cannot change the pathological grade. PSA mass screening can diagnose cancer irrespective of its malignancy; highly malignant prostate cancer can also be detected at its early stage without metastasis allowing for curative treatment. For this reason, both the incidence rates and the MR/IR ratios significantly decreased in 2008 compared with those in 2002 in the IARC data.3, 7

On the other hand, PSA screening would lead to an overdiagnosis and overtreatment for tumours with a Gleason score ≤6.19, 20 The American Cancer Society pays great attention to the issue of overdiagnosis and overtreatment and emphasizes providing sufficient information about screening to allow participants to make an informed decision. The American Cancer Society recommends that men should begin to receive PSA screenings at age 50. Men at higher risk should receive screening from the age of 45. For men whose PSA is <2.5 ng ml−1, screening intervals can be extended to every 2 years. With a PSA level between 2.5 and 4.0 ng ml−1, screening should be conducted annually. Men with a PSA level ≥4.0 ng ml−1 are recommended to be referred for further evaluation or a prostate biopsy.21

The effect of prostate cancer screening on prostate cancer mortality was observed in two similar studies with different results. The United States-based Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial indicated that the death rate from prostate cancer was very low and did not differ significantly between a PSA screening group and a control group.22 However, Hugosson et al.23 found that PSA-based population screening for prostate cancer led to a 44% reduction in prostate cancer disease-specific mortality. Higher contamination with opportunistic screening of the control group was thought to be the reason for the contradicting results of the US study. PSA screening rates in Asian developing countries are still very low, and even in Japan, the percentage of men over 50 years of age who received PSA screenings was estimated to be less than 20%.24 Men had little opportunity to take part in a screening in most Asian countries if they were not invited. Similar trials are needed to evaluate the effects of PSA screening on prostate cancer mortality in Asia.

Summary

In this review, we have examined the possible reasons for the difference in prostate cancer incidence rates and MR/IR ratios between Asia and North America. Annual screening for prostate cancer with PSA in aging men in North America leads to early detection and treatment at as early a stage as possible. A nationwide cancer screening system results in the detection of numerous cancer patients at an early stage and leads to a higher prostate cancer incidence rate and lower MR/IR ratio. The higher prostate cancer incidence rates among Asian American men suggest that the incidence rate in native Asian men would be much higher if they received annual PSA screening. The low MR/IR ratio in Asian American men is equivalent to that of Non-Hispanic whites and is the lowest of five kinds of malignant tumours, suggesting that PSA screening has the potential to improve prostate cancer mortality and increase the cancer detection rate because the tumour marker has a high specificity. Therefore, PSA mass screening should be promoted more vigorously in Asian countries.

Acknowledgments

The authors are grateful to Professor Masaaki Kuwahara for his critical reading and revising of our manuscript. This work was funded by the National Natural Science Foundation of China (Nos. 30801354 and 30970791) and Jilin Provincial Science & Technology Department China (No. 20080154).

The authors declare no competing financial interests.

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