Colorectal cancer risk factors and relative risk.
Abstract
Colorectal cancer (CRC) is one of the leading causes of cancer death in the world. Many risk factors have been identified in the development of colorectal cancer. It is necessary to carry out activities related to risk factors in order to implement effective CRC early diagnosis and screening programs and achieve positive outcomes. International screening guidelines have been created and these are being implemented by individual countries according to their own health policies. Colorectal cancer prevention and early training in terms of disease identification, counseling against negative disease perceptions, and changing false beliefs will reduce the fear of CRC and ensure the development of positive health behaviors and acceptance of screening. Among recent developments in cancer prevention, “cancer risk counseling” has become quite prominent. Individual-specific colorectal cancer risk counseling programs are developed through the assessment of individual risk factors by focusing on a genetic assessment and the development of a risk management plan. This chapter will examine and define colorectal cancer prevention and risk counseling strategies in relation with the relative literature.
Keywords
- Colorectal cancer
- prevention
- cancer risk counseling
- screening
- clinical guidelines
1. Introduction
Colorectal cancer (CRC) is one of the leading causes of cancer death in the world. Colorectal cancer is a significant public health problem in many countries considering its incidence, mortality rate, and treatment costs [1]. Among all cancer deaths, mortality due to CRC ranks second in the world and accounts for 9–10% of all cancers deaths [2–4]. Colorectal cancer is the second most common cancer worldwide [5]. The incidence of CRC in North America and highly industrialized areas such as northwestern Europe and Australia is high, but is low in less developed regions such as Asia, Africa, and South America [2, 5, 6]. Lifetime risk of developing CRC varies between 2.4 and 6%. Risk factors possessed by individuals may increase this rate [2, 3]. It is necessary to carry out activities related to risk factors in order to implement effective CRC early diagnosis and screening programs and achieve positive outcomes. Moreover, implementing cost-effective screening programs decreases costs and increases the effectiveness of CRC screening [7, 8]. Many people do not know the risk factors for CRC; it is reported that those who do know them should be encouraged and supported by professionals to apply safeguard measures and effective interventions. More than half of CRC incidents can be prevented by implementing protection strategies in accordance with risk factors [9, 10]. However, to achieve this, negative behaviors must be changed to positive, and individuals should be directed toward early diagnosis in accordance with their risk conditions and monitored [11, 12]. In the realization of primary and secondary prevention strategies, bespoke colon cancer risk counseling is important for reducing morbidity and mortality [11–13].
2. Colorectal cancer prevention and risk counseling
2.1. Colorectal cancer prevention
2.1.1. Colorectal cancer risk factors
Advancing age, familial and genetic factors, environmental factors, and lifestyle/behavioral factors affect the development of CRC [2, 6–8]. Colorectal cancer risk factors are divided into two groups, those that can be changed and those that cannot [1, 6, 10].
2.1.2. Colorectal cancer prevention strategies
The aim is to prevent cancer, precancerous lesions, and reduce the incidence of cancer-related morbidity and mortality and cancer spread, or at least diagnose it at earlier stages. Cancer prevention research, and the reduction of cancer morbidity and mortality, requires a three-dimensional approach: primary, secondary, and tertiary prevention [4, 6, 11, 20].
Factors increasing the risk | Relative risk |
---|---|
One first-degree relative | 2.2 |
More than one relative | 4.0 |
Relative diagnosed before 45 | 3.9 |
Crohn’s disease | 2.6 |
Ulcerative colitis Colon Rectum |
2.8 1.9 |
Diabetes | 1.2 |
Excessive alcohol consumption |
1.6 |
Obesity | 1,.2 |
Red meat consumption | 1.2 |
Processed meat consumption | 1.2 |
Smoking cigarette | 1.2 |
Physical activity (colon) | 0.7 |
Consumption of dairy products | 0.8 |
Fruit consumption | 0.9 |
Vegetable consumption | 0.9 |
Total dietary fiber consumption (10 g/day) |
0.9 |
2.1.2.1. Primary prevention strategies
Primary prevention includes reducing the effects of carcinogens by using chemopreventive agents or removing environmental carcinogens. The goal of primary prevention is to prevent cancer from starting by reducing individual risk. Primary prevention focuses on lifestyle changes and risk factors related to chemoprevention. Primary prevention measures focus on two areas: making lifestyle changes toward changing primary risk factors and chemoprevention (chemical protection) strategies [20, 21].
2.1.2.1.1. Lifestyle changes
2.1.2.1.2. Chemopreventive measures
The administration of drugs or natural compounds to prevent the development of CRC is called chemoprevention. Colorectal cancer chemoprevention can be considered for advanced adenomas greater than 1 cm with villous histology, and more than two adenomas independent of the size of the adenoma and histology. Also, patients with a family history of cancer or cancer in first-degree relatives benefit from chemoprevention. Some 10% of all CRC groups can benefit from chemoprevention [22]. Research into chemoprevention of CRC is very active and chemical measures are recommended to more people in the high-risk group [6, 18, 21, 22]. Results of studies on chemical measures vary. Nonsteroidal anti-inflammatory drugs (NSAIDs) and aspirin have been determined to inhibit the enzyme cyclo-oxygenase (COX-1 and COX-2), which is involved in development of CRC. Regular aspirin or other NSAID use in humans reduces CRC development by 30–50%. In the recent past, these agents were not recommended for the general population (average risk), but today aspirin and other NSAIDs are recommended for the average-risk group. However, aspirin and other NSAIDs have adverse effects such as gastrointestinal bleeding and stroke, thus the benefit/risk balance of these drugs has restricted their use. In addition, calcium, vitamin D, folic acid, hormone replacement therapy, and the protection provided by statins need to be evaluated in further studies [6, 18, 21, 22].
2.1.2.2. Secondary prevention strategies
Secondary prevention, which enables slow-growing lesions to be diagnosed at early stages, includes early diagnosis and screening methods. Screening achieves better results because it avoids the onset of new cases and enables treatment of tumors at an early stage, which provides a better prognosis. Screening methods such as colonoscopy can identify abnormal cancerous changes so cancer can be prevented from fully developing. Secondary prevention is often associated with the removal of precancerous lesions or intraepithelial neoplasia (e.g., ductal carcinoma in situ, adenoma, or hyperplasia). In this way, disease is caught at an early stage, and the incidence of patients with advanced stage disease and mortality decreases [20, 23]. Polyps, especially adenomatous-type polyps, are known to be the precursor of CRC. The estimated 5-year survival rate of localized tumor (limited to the bowel wall) is 90%, it is 68% when the regional lymph node is involved, and 10% in the presence of distant metastases. CRC screening is recommended for the entire population; some people have a higher risk of developing CRC than others. The most important step is to assess the correct risk of developing CRC, screening is most effective test for individuals [6, 21, 23–27].
Colorectal cancer screening tests are divided into two groups:
Stool tests: guaiac-based fecal occult blood test (gFOBT), fecal immunochemical test, stool DNA test.
Structural analysis: flexible sigmoidoscopy (FS), colonoscopy, double barium contrast radiography, computed tomographic (CT) colonography, virtual colonoscopy, capsule endoscopy.
Each test has different advantages and disadvantages and can be used alone or in combination according to the request and the status of the individual [6]. Secondary prevention measures “Who should be screened and how?” The answer to the questions of who and which test brings clarity to the issue of how and how much will be applied at intervals, which is why CRC screening recommendations/guidelines have been established in many countries [6, 11, 21].
2.1.2.3. Clinical guidelines on colorectal cancer prevention
The aim of screening is to detect a precancer condition in the healthy population, as well as very early-stage malignancies that can be treated with a clearly curative intervention. In this context, international clinical guidelines have been created by the following organizations:
American Cancer Society (ACS), The US Multi-Society Task Force on Colorectal Cancer (USMSTF), and American College of Radiology
U.S. Preventive Services Task Force (USPSTF)
National Comprehensive Cancer Network (NCCN)
European Society for Medical Oncology (ESMO)
Screening tests and follow-up intervals are implemented and updated frequently by these organizations, depending on study results and technical improvements. The recommendations are not applied in the same way for the whole population; there are variations between countries and appropriate tests are recommended based on individual risk situations [6, 11, 16, 21, 24–28]. Although all guidelines recommend starting routine screening for CRC and adenomatous polyps in asymptomatic adults at age 50, there is less agreement as to the screening method, frequency of screening, and at which age screening may be safely discontinued. The recommendations differ for the method, frequency, and age of screening commencement in high-risk patients.
Test | Interval recommendations | Training issues to facilitate decision-making advantage/disadvantage |
---|---|---|
Flexible sigmoidoscopy | Every 5 years1,2 Every 10 years3 The optimal interval should not be <10 years and may even be extended to 20 years3 |
|
Colonoscopy | Every 10 years1,2,3 The optimal interval should not be <10 years and may even be extended up to 20 years3 |
|
Double-contrast colonography | Every 5 years1,2 Uncertain3 |
|
Virtual colonoscopy/ CT colonography |
Every 5 years1 Uncertain2,3 |
|
Test | Recommendations interval |
Training issues to facilitate decision-making advantage/disadvantage |
---|---|---|
Guiac-based FOBT |
Annually1, 2 Annually3 The test interval should not exceed 2 years3 |
|
Fecal immuno-chemical test | Annually1 Uncertain2 The test interval should not exceed 3 years3 |
|
Stool DNA test | Uncertain1,2,3 |
|
Risk category | Starting year | Recommendations/interval | Comment |
---|---|---|---|
CRC or adenomatous polyps in the first 60 years of first-degree relative or two or more first-degree relatives at any age |
40 years, or 10 years younger than the age of the CRC diagnosis in the youngest relative CRC diagnosis1,2 40 years, or 5 years younger than the age of cancer onset in first-degree relatives3 |
Colonoscopy1,2 FOBT and colonoscopy3 Every 5 years1,2,3 |
|
Two adenomatous/CRC polyps in first- or second-degree relatives aged over 60 years |
40 years1,2 or 5 years younger than the age of disease onset in first-degree relatives3 |
Screening frequency and recommendations for moderate risk individuals are applied1,2 Screening/follow-up procedure will be determined by clinical follow-up of patients3 |
Individuals can now scan any screening test but should begin at an early age |
Risk category | Starting year | Recommendations/interval | Comment |
---|---|---|---|
Genetically diagnosed with FAP or without evidence of genetic testing and those suspected in FAP |
10 or 12 years old1,2 Starting at age 12–14 years and continued lifelong in mutation carriers3 |
Individual genetic anomaly that carries genetic tests to determine the annual FSA and consulting requirements1,2 Sigmoidoscopy every 2 years3 |
If genetic testing is positive, colectomy should be considered Screening and monitoring procedures following clinical cases will be determined3 Once adenomas are detected, annual colonoscopy should be carried out until colectomy is planned3 |
For AFAP | Starting at age 18–20 years and continued lifelong in mutation carriers. |
Colonoscopy every 2 years |
After adenomas are detected, colonoscopy should be carried out annually3 |
Genetically or clinically diagnosed with HNPCC individuals, or high-risk individuals for HNPCC | 20–25 years of age or their immediate family members or 10 years younger than the age of the CRC diagnosis in the youngest relative1,2 Starting at age 20–25 or 5 years before the youngest case in the family3 |
Colonoscopy every 1–2 years and counseling on whether the genetic testing is necessary1,2Colonoscopy every 1–2 years.3 Upper limit is not established.3 |
First-degree relatives of people with known hereditary MMR gene mutations should be offered genetic testing for HNPCC. Family mutation as yet unknown, but also those having one of the first three criteria of modified Bethesda should be recommended Screening and monitoring procedures following clinical cases will be determined3 |
The US Preventive Services Task Force (USPSTF) recommends using high-sensitivity fecal occult blood testing, sigmoidoscopy, or colonoscopy from the age 50 years and to continue until the age of 75 years [28]. Higher risk individuals should begin screening at a younger age, and likely more frequently. Whether individuals need to be screened beyond the age of 75 years must be decided on an individual basis. Recommended screening tests and intervals are as follows:
High-sensitivity fecal occult blood test (FOBT)—annual
Flexible sigmoidoscopy—5 yearly (every 3 years with FOBT)
Colonoscopy—every 10 years
Colonoscopy can be used for screening or as a follow-up diagnostic tool in symptomatic patients, or when the results of another CRC screening test are unclear or abnormal [28].
The National Comprehensive Cancer Network (NCCN) has released separate guidelines for average- (Table 2), increased- (Table 3), and high-risk individuals (Table 4). For average individuals, the NNCN’s guidance is almost identical to that of the ACS, USMSTF, and ACR. These guidelines make recommendations for each risk factor for individuals at high risk [27, 28].
According to all international guidelines, screening tests are stratified according to the personal risk of disease. The CRC screening guidelines of ESMO are in parallel with the guiding principles of the European guidelines. The ESMO recommendations for average-, increased-, and high-risk individuals are shown in Tables 2–4, respectively. Guaiac (g) FOBT reduced CRC mortality in average-risk populations by 15% in different age groups. To date, only FOBT has been recommended for men and women aged 50–74 years. Fecal immunochemical testing appears to be superior to gFOBT with respect to detection rates and positive predictive values for adenomas and cancer. Flexible sigmoidoscopy has been demonstrated to reduce CRC and mortality rates when conducted in organized screening programs. FS screening should be discontinued in patients of average risk aged more than 74 years because of the increased number of comorbidities in this population. There is no current evidence to support adding in a one-off sigmoidoscopy to FOBT screening. There is limited efficacy of colonoscopy in reducing CRC incidence and mortality. The optimal age for a single colonoscopy is circa 55 years but the age range for this test is 50–74 years. Newer screening techniques such as computed tomography colonography, stool DNA testing, and capsule endoscopy are still under evaluation and as such should not yet be relied upon to screen the average-risk population [29, 30].
Colorectal cancer screening remains a subject of debate regarding to whom, with which method, and at what frequency; however, its cost-effectiveness has been demonstrated and this is key in influencing the decision to implement CRC screening programs [7, 31]. Policymakers and health professionals who decide on which CRC screening strategy to recommend or implement must be well informed. It is vital that resources are used efficiently when planning or implementing nationwide CRC screening programs, and that a cost-effective option for CRC screening is selected. According to the results of recent review studies, there is a complexity which screening test is the most cost-effective and which screening test should be chosen [7, 31].
Individuals are divided into categories according to their risk of CRC, and the type and frequency of screening methods varies depending on the risk category [6, 21, 23–27]. The risk of developing CRC for an individual is classified into three categories: moderate risk, increased risk, and high risk; screening is recommended in accordance with the risk group of individuals [6, 13]. Persons with known gene mutation or those with suspected gene mutations have a very high risk of contracting the disease [6, 13, 21, 24–27].
2.1.2.3.1. Moderate/average-risk group
Everyone is under the lowest risk for CRC [21]. Personal and family history of colorectal polyps or ulcerative colitis without CRC, chronic inflammatory bowel disease such as Crohn’s disease without CRC, and all individuals aged 50 years and over are at average risk [6, 21, 24–27]. Individuals at average risk are recommended for screening; the frequency of follow-up is shown in Table 2.
2.1.2.3.2. Increased risk group
In this group, risk of CRC is growing twice according to the individuals in average risk. Individuals with a history of adenomatous polyps are at significantly higher risk. A family history of CRC or adenoma increases a person’s risk of developing CRC. If there is a family history CRC or adenomas including first-degree relatives (mother, father, sibling, or child) before the age of 60, the risk of developing CRC at any age (—three to four times the average risk) significantly increases. Screening recommendations for high-risk individuals are shown in Table 3.
2.1.2.3.3. High-risk group
The risk of CRC in individuals with a known genetic mutation is high. The most common hereditary CRC syndrome, HNPCC, also known as Lynch syndrome, is an autosomal dominant syndrome and accounts for 3–5% of all CRCs. Familial adenomatous polyposis, which is characterized by multiple adenomatous colonic polyps, is an autosomal dominant syndrome comprising 1% of all CRC cases. For the FAP, the average age of cancer diagnosed is 39 years for FAP, but in the individuals with FAP 75% of adenomas occurred in 20 years. Recommended screening and surveillance programs for high-risk individuals are shown in Table 4 [6, 21, 24, 30].
2.1.2.4. Tertiary prevention strategies
Tertiary prevention is used in the treatment of specified diseases or prevention of complications associated with the disease, is often used to treat one type of cancer and metastasis, or involves treating patients at risk for development of a secondary primary cancer [20]. The target of tertiary prevention in cancer patients is to reduce morbidity and mortality with the optimal treatment. Primary and secondary prevention practices are recommended in developing or less developed countries due to the fact that greater economic burden of tertiary prevention [20].
2.2. Colon cancer risk counseling
Today, although advances in treatment and screening standards established successful tests for CRC, it is not perceived as a curable and preventable disease. Many people do not know that even simple measures can prevent CRC. Cancer can be prevented in some individual cases, and it is very important to develop the perception in the community and belief that cancer can be prevented and is curable. Determining the level of risk and interpretation, encouraging preventive behaviors, and improving the early diagnosis and screening behaviors are important parts of early detection and screening programs. Prevention of colon cancer will be successful with the health efforts of professionals to increase awareness of the disease, risk assessments, counseling programs with appropriate recommendations, and diagnose the patients in an early stage [32, 33]. In studies conducted in recent years in the prevention of cancer, “cancer risk counseling” concept stands out [32, 34]. Physicians and nurses who work in primary healthcare services and oncology units have an important role and responsibilities in implementing programs and changing behavior that encourages early screening and diagnosis of cancer. Cancer risk counseling focuses on genetic assessment, assessment of individual risk factors, and the development of a risk management plan [35]. At this point, health professionals trained in CRC counseling can take control of their risk by reaching the individuals at an early stage [11, 12, 32, 36, 37]. Cancer risk counseling should be done in a second step in primary care with asymptomatic individuals at moderate risk and members of the increased-risk and high-risk groups. For example, risk counseling to individuals who have registered in family medicine and family health centers in the moderate-risk group is given by public health nurses. Family of individuals with hereditary CRC and of patients are counseled by doctors and nurses in clinical oncology for as long as treatment continues, or by clinical staff of family cancer clinics/genetic private surveillance programs or outpatient clinics, for those with chronic bowel disease if they are under follow-up [32, 36–38]. To conduct CRC risk counseling, physicians and nurses must have the authority and knowledge on this subject.
This risk counseling process encompasses a comprehensive cancer risk assessment, and determining genetic predisposition, information, guidance training and screening, genetic counseling, and creation of a risk management plan that includes the monitoring and evaluation plan. To achieve effective results in risk counseling, giving individual-specific messages, making an assessment of risk status together with the individual, and supporting the individual in the decision-making process is essential. In addition, it is aimed to follow-up screening participation of the individuals, and guide individuals who receive abnormal test results. Thus, CRC risk counseling aims to reduce morbidity and mortality with an increase in screening rates and to detect disease at an early stage [33, 35, 38].
Risk advisor staff who conduct risk counseling and risk assessments must have certain characteristics. CRC staff have to have adequate current information about hardware, communication techniques, good training, and counseling skills. Also, a counseling room should have adequate ventilation and lighting systems suitable for training and counseling. Colorectal cancer risk counseling identifies risk factors for an individual that can and cannot be changed (hazard identification/risk assessment); screening for risk factors proposition includes monitoring of behavior change initiatives and behavioral changes [38].
2.2.1. Stages of colorectal cancer risk counseling
Colorectal cancer risk counseling includes individual education and counseling and is implemented in three stages [32, 38]:
Stage 1: Application phase
Stage 2: Follow-up phase
Stage 3: Evaluation phase
2.2.1.1. Application phase
The creation of awareness through risk assessment and transfer of disease-specific information/education consist of three parts. Before making giving detailed information, disease awareness should be created for the individual, the individual’s attention should be directed toward the subject and they should be allowed to ask questions [38]. At this stage, awareness about factors that increase the risk of disease must be created, and behavioral changes must be implemented in order to ensure appropriate counseling skills and evidence-based interventions [14]. A wide range of communication media have been used in studies aiming to increase awareness of CRC screening ranging from personal letters to TV advertisements. While facilitating effective participation in CRC screening initiatives, such as reminders, mass media and the media, group training, personal training, and assessments, are taken by reducing structural barriers to healthcare professionals and include initiatives such as feedback. The effectiveness of personal reminders, personal training, and counseling in improving CRC screening has been proven [10, 25, 39–44].
Sections | Initiatives/methods | Tools |
---|---|---|
Application phase | ||
Creating awareness | Banners, posters, models, TV and newspaper advertisements, letters, mail/invitation via e-mail, phone messages, calendars, giveaway/inducers such as promotion, promotional stands | |
Risk assessment | Risk assessment tables, pedigree charts, graphs, histograms, electronic health records | |
Disease-specific information | Slides, posters, pamphlets, educational videos, health beliefs scales, written materials | |
Phone calls, text messages, e-mail, reminders, call center awards | ||
Automated phone calls Web-based assessment |
demographic, socioeconomic, cultural characteristics, and medical history (previous/existing diseases, especially chronic bowel disease, polyps),
a detailed family history (especially first- and second-degree relatives),
cognitive and psychosocial (cognitive capacity, CRC knowledge, risk perception, CRC-related health beliefs and attitudes, perceptions, motivation, concerns, barriers, CRC relevant experience, anxiety and fears, coping mechanisms and social support status, decision-making and decision support systems),
lifestyle behaviors (habits that increase the risk of CRC, dietary behaviors, physical activity status, smoking and alcohol use, stress level, given the importance of such a negative attitude and a healthy lifestyle),
do not collect data on exposure to environmental risk factors and other characteristics.
Risk assessment tools for practical risk assessment (risk calculation tool, pedigram) can be made using electronic health records [10, 25, 33, 35, 39, 45]. According to the data obtained, a risk rating of the risk assessment is performed. The risk rating is how to determine whether an individual is at risk and making orientation relative to the risk. The degree of risk of cancer is important in guiding the individual screening tests [6, 11, 21]. In this regard, national/international guidelines should be considered. Risk assessment, web-based tools, and mathematical models of interpretation of risk may make it easier to use directed individual protection proposals. Graphical presentation of risk status (bar, pie, histogram) makes it easier to explain and to understand the risk [6, 21, 33, 45]. Health behavior models have been developed for people to understand why there are different health behaviors or practices they are going to implement. While counseling individuals, health behavior models act as a “black box” to determine factors that affect preventive behaviors and to change negative behaviors to positive. These models are Health Belief Model, Transtheoretic Model, Health Promotion, and Preventive Health Model [11, 12, 14, 38, 39].
The risk status of the individual is described in a way that can be understood. Words, tone of voice, body images, and facial expressions of health personnel can affect the understanding individual risk information. The level of education of the individual, age, cultural, and linguistic differences should be taken into account. In addition, the cost of diagnosis and treatment, transportation requirements, communication, and cultural characteristics are important for the care of the patient’s decision. Particular circumstances of the individual (e.g., affected my social and personal values, and economic and environmental conditions) should be considered. Individuals are given information regarding their assessment and risk diagnostics; when interpreting cancer risks, results that will disrupt the motivation for the individual’s protection behavior or descriptions that will cause anxiety/fear should be avoided [33, 45].
2.2.1.2. Follow-up phase
Maintainance of awareness of the individual is intended to support the CRC protection behavior. It will increase the importance of the disease and practical initiatives to ensure the consistency of behavior covered in the training. The next follow-up face-to-face meeting in the implementation phase can be done through methods such as e-mail or telephone (Table 5). During these initiatives, any information that was given during training that was not clear can be questioned. For example, healthy lifestyle behaviors and screening recommendations for prevention of CRC can be repeated/reviewed, and information can be discussed about where to go in the event of receiving negative test results. At this stage, the behavior of individuals regarding disease protection is expected to show increased enthusiasm. All associated individuals (family, friends, healthcare professionals) are encouraged to support positive and protective behavior [11, 12, 21, 25, 35, 38].
2.2.1.3. Evaluation phase
At this stage, CRC protection behavior exhibited by the individual is evaluated. Changing an individual’s behavior is not a goal that can be realized in a short time, it requires long-term follow-up. In order to ensure continuity, to maintain positive behaviors and enable behavior changes to occur, regular implementation of risk counseling (e.g., 3, 6, 12, 24 months) should be carried out [34, 35, 39]. The evaluation phase, which allows for obtaining feedback from individuals, is usually advised to be face to face. Reasons for an individual wishing to end the program should be taken to identify obstacles and need to reschedule procedures overcome these barriers [11, 12, 21, 32, 35, 38, 41, 45].
3. Conclusions
Primary and secondary prevention practices in the management of CRC are to be carried out together. Applying primary measures alone will not be enough, only having screening tests will not prevent the disease occurrence. Primary healthcare physicians and nurses have an important role in the implementation of risk counseling. Colorectal cancer risk counsellers are required to have special knowledge and skills. Therefore, the staff who undertake counseling are required to have received appropriate training. Colorectal cancer risk counseling is a process that applies to all stages of implementation, including monitoring, evaluation stages, and health services. Many initiatives and recommended methods for each stage of the process have been demonstrated in research. Adequate training in CRC risk counseling practice of health professionals, all relevant employees in surgery, oncology, and public health has been estimated to reduce the incidence of CRC.
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