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HOME > Intest Res > Volume 17(3); 2019 > Article
Review Prevalence and risk factors of colorectal cancer in Asia
Martin CS Wong,orcid, Hanyue Ding, Jingxuan Wang, Paul SF Chan, Junjie Huang
Intestinal Research 2019;17(3):317-329.
DOI: https://doi.org/10.5217/ir.2019.00021
Published online: May 20, 2019

Jockey Club School of Public Health and Primary Care, Faculty of Medicine, Chinese University of Hong Kong, Hong Kong Special Administrative Region, China

Correspondence to Martin CS Wong, Jockey Club School of Public Health and Primary Care, Faculty of Medicine, Chinese University of Hong Kong, 4/F, School of Public Health, Prince of Wales Hospital, Shatin, N.T., Hong Kong Special Administrative Region, China. Tel: +852-2252-8782, Fax: +852-2606-3500, E-mail: wong_martin@cuhk.edu.hk
• Received: March 5, 2019   • Revised: March 29, 2019   • Accepted: April 1, 2019

© Copyright 2019. Korean Association for the Study of Intestinal Diseases. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Globally, colorectal cancer (CRC) is a substantial public health burden, and it is increasingly affecting populations in Asian countries. The overall prevalence of CRC is reported to be low in Asia when compared with that in Western nations, yet it had the highest number of prevalent cases. This review described the prevalence of CRC in Asia according to the International Agency for Research on Cancer from World Health Organization (WHO) database and summarized its major risk factors. Non-modifiable factors include genetic factors, ethnicity, age, gender, family history and body height; smoking, alcohol drinking, weight, Westernized diet, physical inactivity, chronic diseases and microbiota were involved in environmental factors. These risk factors were separately discussed in this review according to published literature from Asian countries. CRC screening has been playing an important role in reducing its disease burden. Some recommendations on its screening practices have been formulated in guidelines for Asia Pacific countries.
  • Keywords: Colorectal neoplasms; Epidemiology; Risk; Asia
The global burden of colorectal cancer (CRC) has been rising rapidly with population growth, changes in demographics and Westernization of lifestyle habits. It was estimated to have 18.1 million new cancer cases, and 9.6 million deaths caused by cancer in year 2018 [1]. CRC is the third commonest diagnosed cancer and the second leading cause of cancer-related mortality [2,3]. According to the World+Health Organization (WHO) GLOBOCAN database, there are 1,849,518 estimated new CRC cases and 880,792 CRC-related deaths in 2018 [4]. Regional estimates show that among half of the new cases, deaths and 5-year prevalent cases were found in Asia.
Approximately 70% CRC cases are sporadic cases which were influenced by environmental factors including dietary habits, physical activity, smoking and alcohol consumption. About 25% of the CRC cases have a genetic predisposition, and 5% of CRC patients have inherited factors associated with its development [5,6]. Family history of CRC and the presence of common chronic conditions, such as metabolic syndrome and fatty liver, were among the key factors reported by existing literature. In a report from Continuous Update Project [7], being physically active, consuming wholegrains, dairy products, foods containing dietary fiber and taking calcium supplements are protective factors against the risk of CRC [8-11]. On the contrary, consuming red or processed meat, consumption of alcoholic beverages, being overweight or obese, and being tall are the risk factors of CRC [9,11-13]. These factors associated with CRC were supported by a meta-analysis including 103 global cohort studies [14]. Recent studies emphasized that global variations in socio-economic development, dietary habits, lifestyle factors, ethnicity and genetics might be drivers of its diverse epidemiology among different countries. The present review discusses the prevalence of CRC; its risk factors and validated models for risk stratification as developed in various countries.
The estimated 5-year cancer prevalent cases were shown in Fig. 1. In 2018, there were 4,789,635 patients who had been diagnosed as having CRC within the previous 5 years. CRC affected men and women almost equally, with 2,595,326 men and 2,194,309 women diagnosed with CRC in 2018. The 5-year prevalence of CRC was 62.8/100,000, and ranked the second among all cancer types [4].
The global epidemiological metrics of CRC were shown in Table 1. Europe had the highest 5-year prevalence, incidence and mortality. Although North America had higher prevalence and incidence, the age-standardized mortality rate was similar to that of Asian countries. According to the statistics of the American Cancer Society, it was estimated that approximately 145,600 new CRC cases would be diagnosed in United States for 2019, whereas the mortality rates are decreasing in both men and women in the past decades [15]. More advanced treatment strategies and the implementation of CRC screening might contribute to its mortality decline.
Africa had the lowest 5-year prevalence, crude incidence and crude mortality rates of CRC (Table 1). The incidence and mortality of CRC varied over 10-fold; and the 5-year prevalence varied over 20-fold between Europe and Africa. These regional differences might be due to an interaction between genetic factors and environmental exposure.
China, Japan, Korea, Malaysia, Singapore and Turkey had higher 5-year prevalence rates than that in other Asian countries (≥ 46.5/100,000) (Fig. 2).
The prevalence, incidence and mortality rates of CRC in Asia were shown in Table 2. China had the highest number of prevalent cases, new cases and deaths, and this could be due to the large population size in China. Japan, Korea, China, Turkey, and Thailand were heavily affected by CRC. India, Indonesia, Vietnam, and Iran had relatively low prevalence, incidence and mortality rates. Tables 1 and 2 showed that certain Asian countries, such as Japan and Korea, the 5-year prevalence and age-standardized incidence were higher than that reported in Western countries. A higher crude incidence (74.1/100,000) and crude mortality (51.5/100,000) was reported for Hong Kong from the latest report of its local Cancer Registry [16]. The temporal trends of these epidemiological figures are different, where China showed an increasing incidence and mortality, Singapore demonstrated rising incidence but reducing mortality, and Japan was reported as having decreasing incidence and mortality [17].
A prospective multinational colonoscopy survey found that more patients were detected as having distal neoplasm than with proximal neoplasm (45.2% vs. 39.3%) [18]. Some literature compared the clinicopathologic characteristics of colorectal adenoma in different timepoint, and suggested a trend of proximization of colorectal adenoma [19,20]. Recently, a Chinese crosssectional study reported a higher adenoma detection rate in the right colon as compared to the left colon (44.1% vs. 39.0%) [21]. This change in tumor-sidedness of colorectal adenoma was similar with global pattern [22]. Comparing Asian and Western countries, the United States had a higher proportion of proximal adenomas than that found in South Korea (62.8% vs. 45.9%, P<0.001) [23]. A Korean study indicated that higher proportion of the older populations had right-sided adenoma than the younger group (76.6% vs. 65.2%, P<0.001) [24]. A study from Japan suggested the gender-specific difference in the proximal shift of CRC, and reported that female gender was an independent factor associated with right-sided adenoma [25]. Since an increasing prevalence of CRC exerts a great impact on public health burden, a targeted approach to identify subjects with risk factors is crucial to inform preventive strategies.
There are many risk factors associated with the incidence of CRC. Some non-modifiable factors include genetic factors, ethnicity, age, gender, body height, and family history of CRC.
1. Genetic Factors
The sequential accumulation of mutations in adenomatous polyposis coli (APC), Kirsten-ras (K-ras) and p53 were found to be involved in chromosomal instability (CIN)-associated carcinogenesis, while BAT25 and BAT26 were involved in microsatellite instability (MSI)-associated carcinogenesis [26,27]. However, some Asian studies among patients with CRC showed lower mutation rate of APC, K-ras, and p53 in Mongoloids than Caucasians [28-31]. Novel molecular markers were recently detected by genome-wide association studies (GWAS) in Asia. GWAS has been a powerful tool used to identify variants of single nucleotide polymorphisms (SNP), which could evaluate an individual’s genetic susceptibility to CRC risk. Risk variants were extracted from tumor-adjacent normal tissues, blood samples and buccal cells based on various types of methods to replicate for genotype analysis [32-34]. To date, more than 50 independent loci were identified in relation to their CRC risk. Most GWAS have been conducted among people in European descent [32]. In recent years, researchers had extended their genetic correlation studies to Asian populations, such as Chinese, Japanese and Korean [32, 33, 35, 36]. A study of East-Asian ancestral data introduced 4 loci: 6p21.1 (rs4711689), 8q23.3 (rs2450115, rs6469656), 10q24.3 (rs4919687), and 12p13.3 (rs11064437) which were associated with the risk of CRC [32]. Moreover, personal behavior may also affect the genetic susceptibility and CRC risk. Longer pack-year of cigarette smoking increased CRC risk and significantly interacted with loci of 14q22.3 (rs1957636) and 20p12.3 (rs4813802) in Korean men; 1q41 (rs6687758) and 11q12.2 (rs174537) in Korean women [36]. Besides, Asian and Western ethnicity may have different implications to CRC. Recently, researchers evaluated CRC genetic risk to Asian population and identified 14 loci in the Asia CRC consortium, where 8 loci could not be replicated in European descent [33]. Genetic susceptibility and variation are gaining importance for GWAS and could inform risk of CRC.
2. Ethnicity
The Asia Pacific consensus identified some Asian ethnic groups, like Chinese, Japanese and Korean, that were more susceptible to CRC [37]. A multinational prospective cohort study which included individual of 9 ethnicities (Chinese, Indian, Indonesian, Japanese, Korean, Malay, Filipino, Thai, and white) reported increased risk for advanced colorectal neoplasia among Japanese, Korean and Chinese [18]. One Malaysian study that examined the incidence and mortality by ethnicity reported that Chinese population had the highest age-standardized incidence (27.35/100,000) and age-standardized mortality (11.85/100,000) when compared with Indians and Malays [38]. Similar conclusion was also demonstrated in a Singaporean study that was conducted among populations of Asian Descents, where Chinese had a higher CRC incidence than Indian and Malays [39]. A cohort study of the United States investigated the age-adjusted CRC incidence of Asian populations in California. It found that the incidence among foreign-born Japanese (74.6/100,000) was more than 3-fold of that among foreign-born South Asians (22.0/100,000) [40].
3. Age
Age is the most significant factor influencing the risk of CRC development. Risk of CRC increases dramatically after age 50 years; 90% of all CRCs are diagnosed after 50 years old. According to the Surveillance, Epidemiology and End Results Program from National Cancer Institute, the incidence rate of CRC in the United States increased sharply after age 40 years and rates for male subjects were significantly higher than that in female subjects [41]. This trend was also identified and reported in various Asian countries. One recent Korean report examining the age-specific incidence of CRC reported that the CRC age-specific incidence increased sharply among individuals aged 35 to 64 years when compared with those aged ≥ 65 years [42]. This positive association between CRC risk and advanced age was also reported by the cancer statistics report published for China [43], Japan [44], and Hong Kong [16].
A population-based cluster analysis conducted in China earlier has confirmed that with increasing life expectancy, CRC incidence and mortality are higher [45]. The life expectancy was the highest in Hong Kong (84.23), Japan (83.98), and Korea (82.02) [46]. The longer life expectancy may account for the higher incidence and mortality of CRC in these regions.
4. Gender
Many Asian countries reported that male gender was associated with a higher incidence of CRC. In terms of the latest national estimates of cancer statistics based on the Korea National Cancer Incidence Database, the age-standardized incidence of CRC was higher in male (40.2/100,000) than that in female (22.2/100,000) in 2015 [42]. Others Asian countries or regions also reported similar results, like Japan (64.8/100,000 in male; 36.7/100,000 in female, 2013) [44], China (20.7/100,000 in male; 14.4/100,000 in female, 2014) [43], and Hong Kong (44.6/100,000 in male; 27.6/100,000 in female, 2016) [47]. In addition, there was a differential distribution of CRC between men and women, where higher proportion of men were diagnosed with cancer in the distal rectum and colon than women [48-50]. Although the etiology for gender difference remained uncertain, some researchers made efforts to explain the difference. Some large-scale studies explored the role of estrogens and progestins as protective ingredients against CRC in hormone replacement therapy in postmenopausal women [51,52]. Others suggested that gender difference could be attributed to varying levels of exposure to dietary and lifestyle risk factors [53]. Also, a survey showed that men aged 50 years or above were particularly unaware of the symptoms of CRC and the benefits of screening [54], rendering them less likely to seek medical advice among symptomatic patients and attend screening program among asymptomatic individuals.
5. Family History
People who had a family history of CRC or adenomatous polyps were considered as having higher risk for CRC. Possible explanations included inherited risks, environmental factors, or a combination of both [55]. A case-control study of Hong Kong compared the prevalence of advanced colorectal neoplasia among asymptomatic siblings of CRC patients with siblings of individuals without family members suffering from CRC. The study found a 3-fold difference between the prevalence of advanced neoplasia among case group (7.5%) and control group (2.9%) [56]. Asian studies also supported that family history of CRC was significantly associated with CRC risk (OR, 2.0–3.5) [57,58]. A Korean study further specified family history was associated with proximal colon cancer in men (HR = 1.4) and distal colon cancer in both men (HR = 1.4) and women (HR = 1.6) [59]. A meta-analysis on 9.28 million individuals found that the increase in RR of CRC attributed to family history was higher in younger subjects [60]. Another prospective study conducted in 16 AsiaPacific countries concluded it is unnecessary to discriminate proband identity in screening patients with affected first-degree relatives [61].
6. Body Height
A global meta-analysis reported that each 5-cm increase in height was associated with a RR of 1.04-fold in Western countries [13], and this positive association was also supported by a recent global review [62]. Some Asian research supported this conclusion. A Japanese research found that body height was associated with risk of CRC in both men and women [63]. A Korean study found similar association with risk for colon cancer [64]. Another Korean research indicated height had a positive association with increased risk of distal colon cancer (P-trend = 0.003 in male) and rectal cancer (P-trend = 0.004 in female) [59]. Whereas, other studies reported no significant association between height and CRC risk for either men or women [65,66].
1. Smoking
In order to further stratify the risk of CRC, The Asia-Pacific Colorectal Screening Working Group for CRC developed a validated score and identified age, gender, family history and smoking as predictive factors of advanced neoplasia [67]. Smoking is a modifiable risk factor responsible for 8.4% incident CRC and death of CRC in male and 0.4% in female [68]. A Japanese research specifically outlined the positive association between packyears of smoking and the risk of rectal cancer in male [63], while another Singapore-Chinese study reported that smoking was only associated with risk of having rectal cancer [69]. A Korean study also reported that former smokers had higher risk of distal cancer in men (HR = 1.4), but not CRC [59]. Nevertheless, there were 2 studies in Thailand and Oman that reported no significant association between smoking and risk of CRC [70,71].
2. Alcohol Drinking
When compared with non-drinkers, higher alcohol consumption was significantly associated with elevated CRC risk [72,73]. There is a dose-response relationship found in a study from Japan [74], but not among Singaporeans who consumed alcohol 7 or more times per week [69]. Some studies found that the risk of CRC imposed by alcohol consumption affects was different at different sites and in different gender. It has been reported that both frequent and high amount of alcohol consumption had positive associations with the risk of distal colon cancer in Korean men and rectal cancer in Korean women (P-trend < 0.001, respectively) [59]. A study from Japan indicated that alcohol consumption in male demonstrated a dose-response relationship with risk of cancer in distal colon and rectum, but not proximal colon [75]. Drinking alcohol was responsible for higher incidence and mortality of CRC, attributing for 8.7% in men and 1.1% in women in China [68]. Two studies conducted in Thailand [70] and Oman [71] did not show such an association.
3. Overweight and Obesity
A recent cohort study of Asian women observed that obesity has a positive association with risk of colon cancer but not risk of rectal cancer [76]. Whereas, some studies found opposite results that overweight and obesity increased the risk of colon cancer in men only, but not in women [63,65,77-79]. The association between overweight or obesity and CRC risk on both gender was also reported in China [68], Japan [80], Malaysia [72], and Oman [71]. A Korean study found BMI was a site-specific risk factor which was associated with risk of distal colon cancer in men (P-trend < 0.001), and marginally increased risk of proximal colon cancer in women (P-trend = 0.057) [59]. A study conducted in Singapore indicated that there was a U-shaped, quadratic association between BMI and colon cancer risk, but there was no association between BMI and rectal cancer risk [81].
Some studies used other measurements such as waist circumference or waist-hip ratio as a proxy measure of central obesity. The cohort study mentioned before considered abdominal obesity as an independent risk factor for colonic cancer [76]. A Chinese study demonstrated a positive association between central adiposity and CRC risk in male [78]. A systematic review from World Cancer Research Fund and the American Institute for Cancer Research demonstrated RRs were 1.02 per 10 cm increase in waist circumference and 1.03 per 0.1 unit increase in waist-hip ratio [13].
4. Westernized Diet
Westernized diet refers to a dietary composition with more red meat and processed meat, less fruit and vegetable, and it contributes to the development of CRC [82]. There was a systematic review summarizing most associations between dietary patterns and CRC in Asia [83]. This review found that white meats have no association, while red meats and processed meats have positive associations with CRC risk. Conversely, general consumption of vegetables, fruits and fiber are protective factors against CRC risk. This observation was also replicated by recent studies in China [68,84], Korea [85], Japan [58]. Yet, some research reported that the magnitude of the associations were different between gender and sites. For example, a study conducted in Korea indicated there was a higher risk of proximal colon cancer in men (P-trend = 0.005) and rectal cancer in women (P-trend = 0.02) for those who frequently consumed meat [59]. A study performed in Japan concluded that higher consumption of processed meat significantly affected men, not women [86,87]. There are some studies that found no association between food consumption and risk of CRC in China [88], Japan [89,90], and Singapore [91]. The Ohsaki cohort study indicated that a Japanese dietary pattern had no association with CRC risk [92].
5. Physical Inactivity
A systematic review found an inverse association between physical activity and CRC among Japanese population, and this association was stronger for colon cancer than for rectal cancer [93]. A Chinese study found that physical inactivity accounted for 8.9% of all incidence and death of CRC in male and 9.0% in female [68]. A study conducted in Malaysia supported that performing regular physical activity could prevent CRC [72], although the finding was not echoed by a study among Chinese individuals [89].
6. Chronic Diseases
Since aging is global issue, there is a need for us to explore the relationship between multimorbidity and CRC. Generally speaking, common chronic diseases that have been identified as risk factors for CRC include diabetes mellitus, hypertension and coronary artery disease. Individuals with diabetes had higher risk for CRC in China (OR = 4.97) [57]. Diabetes mellitus and hypertension had association with risk of CRC among men but not among women in Korea [79], and similarly in people living in Western countries [90]. Researchers in Hong Kong also reported the prevalence of CRC was higher in patients with coronary artery disease, which might be due to the concomitant presence of diabetes and hypertension among those with heart diseases [94].
7. Microbiota
The influence of microbiota on CRC remains controversial. Recent metagenomics studies suggested a causal relationship between microbial dysbiosis and CRC [95-97]. A study conducted in Hong Kong revealed that the multifaceted role of the microbiome in the development of CRC was indicated by the alterations of the gut virome [98]. There was a support to the bacterial theory of colorectal carcinogenesis. An association of CRC caused by Streptococcus gallolyticus, Bacteroides fragilis, Fusobacterium nucleatum, Peptostreptococcus species was found in another study performed in Hong Kong [99]. Results of a global meta-analysis showed that there was a 1.4-fold increased risk of CRC in patients with Helicobacter pylori, but the authors also admitted that there was a possibility of publication bias which could not be ruled out [100]. Despite the above positive results on the association between microbiota and CRC, inconsistent result was also found. In a meta-analysis based on Asian populations consisting of 2,081 patients with colorectal neoplasm and 5,598 healthy controls, no statistical association between H. pylori infection and risk of colorectal neoplasm was found [101].
Stratifying risk tiers of CRC has been recommended by the Asia Pacific Working Group on CRC as a simple means to improve the cost-effectiveness of screening program, as well as to tailor make individuals to receive more appropriate screening tests [102]. To stratify risk among Asians, the most widely-adopted strategy was based on age–asymptomatic individuals aged over 50 years were recommended for screening programs irrespective of their risk. In regions including Korea, Japan, Hong Kong, Singapore, Turkey, and Taiwan, these asymptomatic subjects were subsidized for screening [67,103-105]. Yet in other Asian regions, neither governmental subsidy nor national guidelines were available. Screening colonoscopy studies in Asia confirmed that at the age of 50, the risk of finding advanced neoplasia is significantly increased from around 1% to > 3% [106-109].
However, other factors such as gender, family history, lifestyle habits and race may affect the outcome of CRC screening. Several statistical tools have been developed to stratify the risks of CRC among Asian subjects. Age, body mass index, serum cholesterol, family history of cancer, and alcohol consumption were included in many risk-stratifying models among Korean screening population. Their discriminatory capabilities to stratify risk was moderate, and were noted by studies especially on male subjects [110]. Similarly, Japanese scholars developed risk prediction models by assessing age, BMI, daily physical activity, alcohol consumption, smoking habit, family history of CRC, and diabetes [111]. In addition, China developed its own risk-assessment questionnaire [112]. According to the questionnaire, “high risk” subjects are subsidized to colonoscopy even when their fecal occult blood test results are negative. The Asia-Pacific Colorectal Screening (APCS) developed a validated score ranging from 0 to 7, identifying age, gender, family history and smoking to stratify risk into 3 tiers: 0–1, average risk; 2–3, moderate risk; and 4–7, high risk. subjects with moderate risk and high risk had 2.6-fold (95% CI, 1.1–6.0) and 4.3-fold (95% CI, 1.8–10.3) increased prevalence of advanced neoplasia, respectively, than subjects with average risk [67]. Some guidelines have included the APCS score to stratify subjects according to risk levels–average risk subjects were recommended to receive fecal immunochemical test whilst colonoscopy may be reserved for subjects with high risk [113]. A study compared 4 existing sigmoidoscopy-based strategies, highlighting the need to devise a new scoring system for prediction of advanced proximal neoplasia [114]. A novel instrument of predicting the susceptibility to all colorectal neoplasia in asymptomatic persons has also been developed, facilitating informed choices on screening tools [115]. However, there were some challenges to the adoption of risk algorithms [116], including the time required for stratification in busy clinical settings and the selfreported nature of some variables.
The Asia Pacific Consensus recommended the target age range for CRC screening as 50 to 75 years [102], which is the same as the U.S. Preventive Services Task Force [116]. Meanwhile, as the prevalence of CRC increased sharply among younger Asian adults in the past decades, more scholars noted the importance to develop risk assessment tools, especially for subjects aged < 50 years. Based on the Young Adult Colorectal Screening score in Korea, the risk of advanced colorectal neoplasia increased 5.8-fold (95% CI, 3.4–9.8) in the high-risk tier when compared with the low-risk tier [110]. According to the updated CRC screening guideline from the American Cancer Society, the starting age for CRC screening has been lowered to 45 years old as a qualifying recommendation [117].
More recently, risk stratification tools combining family history and blood-based RNA tests were recommended by international professionals on CRC. Some studies used genetic risk score, which adopts risk variants to predict CRC. Studies in Korea based on 7 SNPs (rs3802842, rs4939827, rs6983267, rs10505477, rs10795668, rs961253, and rs9929218) to develop a genetic risk score for prediction. These 7 SNPs had significant associations with CRC and rectal cancer, but no clear association with colon cancer. To predict CRC, the model that incorporates traditional risk score and genetic risk score failed to show significant change when compared with traditional risk score alone. But for rectal cancer alone, there was a 3% improvement in its discriminatory capability [118]. A Chinese study used 7 SNPs (rs647161, rs10505477, rs6983267, rs10795668, rs7229639, rs4939827, and rs2423279) to build a genetic risk score. The results showed a combination of genetic risk score and traditional risk factors, including age, gender, smoking and alcohol consuming, performed better than traditional risk model to predict CRC risk in Chinese Han population [119]. A study from Japan also reported a significant association between weighted genetic risk score and CRC risk. They also indicated that the prediction model included general risk factors and genetic factors, which was better than models with no genetic components [120].
Adherence is also important to ensure the success of a CRC screening program. Reminders should be considered in individuals with higher risk for CRC screening noncompliance. Recently, a randomized controlled trial showed that telephone calls and short message services conferred a 5.2- and 2.4-fold higher likelihood of compliance [121,122]. More considerations include the affordability of these interventions, and the resources required for post-screening diagnosis [123].
CRC is public health burden in Asian countries due to increase in its prevalence and incidence. This should be addressed by health education to heighten disease awareness, formulation of screening initiatives, and strengthening of various preventive strategies. Risk factors in Asia have slight differences with Western countries, and targeted screening based on individual risk seems a cost-effective approach in countries where colonoscopy resources are limited. The development of risk stratification tools for more accurate prediction of CRC and advanced neoplasia is warranted.

FINANCIAL SUPPORT

The authors received no financial support for the research, authorship, and/or publication of this article.

CONFLICT OF INTEREST

No potential conflict of interest relevant to this article was reported.

AUTHOR CONTRIBUTION

Conceptualization: Wong MC. Writing - original draft preparation: Ding H, Wang J, Chan PS. Writing - review and editing: Ding H, Wang J, Huang J, Wong MC. Supervision project administration: Wong MC. Approval of final manuscript: all authors.

Thanks for the cooperation of our team.
Fig. 1.
Estimated 5-year cancer prevalent cases in 2018 (top 10). There were 4,789,635 patients (2,595,326 men and 2,194,309 women) who had been diagnosed as having colorectal cancer within the previous 5 years. Data source: International Agency for Research on Cancer, GLOBOCAN 2018, World Health Organization (WHO) [4].
ir-2019-00021f1.jpg
Fig. 2.
The 5-year prevalence of colorectal cancer in Asia, 2018. China, Japan, Korea, Malaysia, Singapore, and Turkey had higher 5-year prevalence rates than that in others area (≥46.5/100,000). Data source: International Agency for Research on Cancer, GLOBOCAN 2018, World Health Organization (WHO) [4].
ir-2019-00021f2.jpg
Table 1.
Estimated Worldwide Epidemiology of Colorectal Cancer in 2018
Population 5-Year prevalent case 5-Year prevalencea New Crude incidencea Age-standardized incidencea Death Crude mortalitya Age-standardized mortalitya
Asia 2,356,976 51.9b 957,896 21.1b 17.7b 461,422 10.2b 8.3b
Europe 1,403,877 188.7d 499,667 67.2d 30.0c 242,483 32.6d 12.6c
North America 534,049 146.8d 179,771 49.4d 26.2c 64,121 17.6c 8.4b
Latin America and the Caribbean 315,005 48.3b 128,006 19.6b 16.8b 64,666 9.9b 8.1b
Africa 113,625 8.8b 61,846 4.8b 8.2b 40,034 3.1b 5.5b
Oceania 66,103 160.2d 22,332 54.1d 33.1c 8,066 19.5c 10.7c
World 4,789,635 62.8 1,849,518 24.2 19.7 880,792 11.5 8.9

a Proportions per 100,000.

b Rate < world proportion.

c Rate ≥ world proportion & < 2×world proportion.

d Rate ≥ 2×world proportion.

Data source: International Agency for Research on Cancer, GLOBOCAN 2018, World Health Organization (WHO) [4].

Table 2.
Estimated Epidemiology of Colorectal Cancer in Asia, 2018
Population 5-Year prevalent case 5-Year prevalencea New case Crude incidencea Age-standardized incidencea Death Crude mortalitya Age-standardized mortalitya
China 1,248,644 87.7c 521,490 36.6c 23.7c 247,563 17.4c 10.9c
Japan 431,679 339.4d 148,151 116.5d 38.9d 57,910 45.5d 12.0c
Korea 122,933 240.3d 42,363 82.8d 44.5d 9,762 19.1c 8.7c
India 113,046 8.3b 56,751 4.2b 4.4b 43,090 3.2b 3.4b
Indonesia 66,175 24.8b 30,017 11.3b 12.1b 16,386 6.1b 6.9b
Turkey 49,614 60.6c 20,031 24.5c 21.0c 10,033 12.2c 10.2c
Thailand 42,417 61.3c 17,534 25.3c 15.5b 9,462 13.7c 8.4c
Philippines 34,268 32.2b 15,680 14.7b 18.9c 8,821 8.3b 11.0c
Vietnam 32,895 34.1b 14,733 15.3b 13.4b 8,104 8.4b 7.0b
Iran 24,345 29.7b 9,864 12.0b 12.9b 4,153 5.1b 5.6b
Asia 2,356,976 51.9 957,896 21.1 17.7 461,422 10.2 8.3

a Proportions per 100,000.

b Rate < world proportion.

c Rate ≥ world proportion & <2×world proportion.

d Rate ≥ 2×world proportion.

Data source: International Agency for Research on Cancer, GLOBOCAN 2018, World Health Organization (WHO) [4].

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      Prevalence and risk factors of colorectal cancer in Asia
      Intest Res. 2019;17(3):317-329.   Published online May 20, 2019
      DOI: https://doi.org/10.5217/ir.2019.00021
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    Prevalence and risk factors of colorectal cancer in Asia
    Image Image
    Fig. 1. Estimated 5-year cancer prevalent cases in 2018 (top 10). There were 4,789,635 patients (2,595,326 men and 2,194,309 women) who had been diagnosed as having colorectal cancer within the previous 5 years. Data source: International Agency for Research on Cancer, GLOBOCAN 2018, World Health Organization (WHO) [4].
    Fig. 2. The 5-year prevalence of colorectal cancer in Asia, 2018. China, Japan, Korea, Malaysia, Singapore, and Turkey had higher 5-year prevalence rates than that in others area (≥46.5/100,000). Data source: International Agency for Research on Cancer, GLOBOCAN 2018, World Health Organization (WHO) [4].

    Fig. 1.

    Fig. 2.

    Prevalence and risk factors of colorectal cancer in Asia
    Population 5-Year prevalent case 5-Year prevalencea New Crude incidencea Age-standardized incidencea Death Crude mortalitya Age-standardized mortalitya
    Asia 2,356,976 51.9b 957,896 21.1b 17.7b 461,422 10.2b 8.3b
    Europe 1,403,877 188.7d 499,667 67.2d 30.0c 242,483 32.6d 12.6c
    North America 534,049 146.8d 179,771 49.4d 26.2c 64,121 17.6c 8.4b
    Latin America and the Caribbean 315,005 48.3b 128,006 19.6b 16.8b 64,666 9.9b 8.1b
    Africa 113,625 8.8b 61,846 4.8b 8.2b 40,034 3.1b 5.5b
    Oceania 66,103 160.2d 22,332 54.1d 33.1c 8,066 19.5c 10.7c
    World 4,789,635 62.8 1,849,518 24.2 19.7 880,792 11.5 8.9
    Population 5-Year prevalent case 5-Year prevalencea New case Crude incidencea Age-standardized incidencea Death Crude mortalitya Age-standardized mortalitya
    China 1,248,644 87.7c 521,490 36.6c 23.7c 247,563 17.4c 10.9c
    Japan 431,679 339.4d 148,151 116.5d 38.9d 57,910 45.5d 12.0c
    Korea 122,933 240.3d 42,363 82.8d 44.5d 9,762 19.1c 8.7c
    India 113,046 8.3b 56,751 4.2b 4.4b 43,090 3.2b 3.4b
    Indonesia 66,175 24.8b 30,017 11.3b 12.1b 16,386 6.1b 6.9b
    Turkey 49,614 60.6c 20,031 24.5c 21.0c 10,033 12.2c 10.2c
    Thailand 42,417 61.3c 17,534 25.3c 15.5b 9,462 13.7c 8.4c
    Philippines 34,268 32.2b 15,680 14.7b 18.9c 8,821 8.3b 11.0c
    Vietnam 32,895 34.1b 14,733 15.3b 13.4b 8,104 8.4b 7.0b
    Iran 24,345 29.7b 9,864 12.0b 12.9b 4,153 5.1b 5.6b
    Asia 2,356,976 51.9 957,896 21.1 17.7 461,422 10.2 8.3
    Table 1. Estimated Worldwide Epidemiology of Colorectal Cancer in 2018

    Proportions per 100,000.

    Rate < world proportion.

    Rate ≥ world proportion & < 2×world proportion.

    Rate ≥ 2×world proportion.

    Data source: International Agency for Research on Cancer, GLOBOCAN 2018, World Health Organization (WHO) [4].

    Table 2. Estimated Epidemiology of Colorectal Cancer in Asia, 2018

    Proportions per 100,000.

    Rate < world proportion.

    Rate ≥ world proportion & <2×world proportion.

    Rate ≥ 2×world proportion.

    Data source: International Agency for Research on Cancer, GLOBOCAN 2018, World Health Organization (WHO) [4].

    Table 1.

    Table 2.

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