Comparing a fecal immunochemical test and circulating tumor DNA blood test for colorectal cancer screening adherence.

BACKGROUND AND AIM: Colorectal cancer (CRC) screening programs are most effective at reducing disease incidence and mortality through sustained screening participation. A novel blood test modality is being explored for CRC screening, but it is unclear whether it will provide sustained screening participation. This study aimed to investigate whether a circulating tumor DNA (ctDNA) blood test improved CRC screening re-participation when compared with a fecal immunochemical test (FIT) and to define the predictors of sustained CRC screening in an Australian population. METHODS: South Australians who initially participated in CRC screening using a ctDNA blood test (n = 36) or FIT (n = 547) were offered the same CRC screening test approximately 2 years later through an extended phase of a randomized controlled trial. Surveys collected demographic, psychosocial, and clinical information. Predictors of CRC screening re-participation were explored using chi-square, Wilcoxon tests, and logistic regression. RESULTS: Participants offered a second ctDNA blood test were equally likely to re-participate in CRC screening as those who completed a FIT in the first round and who were offered the same test (61% vs 66% re-participation respectively, P = 0.6). CRC fatalism, health activation, and self-efficacy were associated with repeated screening participation. Test awareness was predictive of repeated FIT-based CRC screening. CONCLUSIONS: Targeted interventions to improve CRC screening awareness and increase patient health activation may improve CRC screening adherence. A ctDNA blood test may be a suitable CRC screening option to maintain CRC screening adherence in people who do not participate in screening with FIT.

Age- and sex-stratified detection rates and associated factors of colorectal neoplasia in the Tianjin colorectal cancer screening program from 2012 to 2020.

PURPOSE: Colorectal cancer (CRC) screening has been implemented in Tianjin, China since 2012. The objective was to estimate the neoplasia detection rate in a high-risk population by age and sex and to investigate the potential factors associated with colorectal neoplasia. PATIENTS AND METHODS: This study is based on data of the Tianjin CRC screening program from 2012 to 2020. Residents with a positive high-risk factors questionnaire (HRFQ) or a positive faecal immunochemical test (FIT) were identified as high-risk participants and were subsequently recommended for a free colonoscopy. RESULTS: A total of 4,117,897 eligible participants aged 40-74 years completed both a HRFQ and FIT, and 217,164 (5.3%) of them were identified as high-risk participants. Positive rates of preliminary screening increased with age and were higher in females than in males. For 57,971 participants undertaking colonoscopy, the detection rates of nonadvanced adenoma, advanced adenoma and CRC were 37.8%, 5.7% and 1.6%, respectively. Detection rates of advanced neoplasia increased from the age of 50 and were higher in males. For nonadvanced neoplasia, a strong increase was observed in males from the age of 40 and in females from the age of 50. Male sex had a greater impact on individuals aged 40-49 than on older individuals. Several factors including current smoking, drinking, and higher body mass index (BMI) were significantly associated with the presence of neoplasia, whereas, these associations were mainly restricted to individuals aged above 50 but not those aged 40-49 years. CONCLUSIONS: These findings support that age-specific risk stratification and sex-specific initiating ages for CRC screening should be recommended to improve the accuracy and effectiveness of current screening strategy.

Durability of FIT Screening After Cessation of a Screening Outreach Intervention.

INTRODUCTION: Organized outreach to increase CRC screening using mailed FIT tests has been shown to be effective, but durable changes to screening behavior after cessation of screening is not known. METHODS: In this study, after cessation of funding for an organized cancer screening outreach program, we evaluated whether adherence to screening remained elevated. Patients aged 50-75 years eligible for CRC screening from eight safety net clinics were randomly assigned to outreach intervention vs usual care alone in 2016 to 2018; the primary outcome analyzed was the difference in the cumulative proportion of completed FIT screening between study assignments 1 year after study cessation. RESULTS: Despite higher rates of FIT screening for patients who were randomly assigned to the outreach intervention, FIT completion was not significantly different between the group that received the outreach services versus the usual care group (28.3% vs 29.8%, p = 0.158). CONCLUSION: Outreach campaigns and their activities must be sustained to maintain improved rates of screening participation.

Practice of colorectal cancer screening in the United Arab Emirates and factors associated - a cross-sectional study.

BACKGROUND: Colorectal cancer is a significant public health concern globally, with high incidence and mortality rates. Despite the implementation of CRC screening guidelines, the uptake of screening among adults in the UAE remains low. This study aimed to assess the practice, factors associated, barriers, and knowledge gaps among adults in the UAE. MATERIALS AND METHODS: 2100 residents of the UAE, aged > = 40 years, participated in the study. A validated questionnaire was used to collect data. Data was collected through online platforms and face-to-face interviews in healthcare settings. Chi-Square test and binary logistic regression were used for data analysis. RESULTS: The study revealed a low CRC screening rate of 9.1%. Factors analyzed included age groups, health insurance coverage, regular physician checkups, family history of CRC, awareness of CRC, and knowledge levels about CRC and its signs and symptoms. Participants in the 50-59 age group showed a slightly higher likelihood of CRC screening, but the difference was not statistically significant. However, individuals in the 60-69 and > = 70 age groups were more likely to undergo screening. Regular physician checkups, family history of CRC, prior knowledge of CRC, and knowledge about the disease and its signs and symptoms were associated with a higher likelihood of screening, with statistically significant OR. CONCLUSION: A low CRC screening rate of 9.1% among adults. Barriers to screening included not being offered a test by physicians, fear of positive results, discomfort with the screening process, perception of pain, and lack of knowledge. Identifying particulate barriers and developing targeted measures requires larger-scale research.

Implementing Mailed Colorectal Cancer Fecal Screening Tests in Real-World Primary Care Settings: Promising Implementation Practices and Opportunities for Improvement.

Colorectal cancer (CRC) screening reduces morbidity and mortality, but screening rates in the USA remain suboptimal. The Colorectal Cancer Control Program (CRCCP) was established in 2009 to increase screening among groups disproportionately affected. The CRCCP utilizes implementation science to support health system change as a strategy to reduce disparities in CRC screening by directing resources to primary care clinics to implement evidence-based interventions (EBIs) proven to increase CRC screening. As COVID-19 continues to impede in-person healthcare visits and compel the unpredictable redirection of clinic priorities, understanding clinics' adoption and implementation of EBIs into routine care is crucial. Mailed fecal testing is an evidence-based screening approach that offers an alternative to in-person screening tests and represents a promising approach to reduce CRC screening disparities. However, little is known about how mailed fecal testing is implemented in real-world settings. In this retrospective, cross-sectional analysis, we assessed practices around mailed fecal testing implementation in 185 clinics across 62 US health systems. We sought to (1) determine whether clinics that do and do not implement mailed fecal testing differ with respect to characteristics (e.g., type, location, and proportion of uninsured patients) and (2) identify implementation practices among clinics that offer mailed fecal testing. Our findings revealed that over half (58%) of clinics implemented mailed fecal testing. These clinics were more likely to have a CRC screening policy than clinics that did not implement mailed fecal testing (p = 0.007) and to serve a larger patient population (p = 0.004), but less likely to have a large proportion of uninsured patients (p = 0.01). Clinics that implemented mailed fecal testing offered it in combination with EBIs, including patient reminders (92%), provider reminders (94%), and other activities to reduce structural barriers (95%). However, fewer clinics reported having the leadership support (58%) or funding stability (29%) to sustain mailed fecal testing. Mailed fecal testing was widely implemented alongside other EBIs in primary care clinics participating in the CRCCP, but multiple opportunities for enhancing its implementation exist. These include increasing the proportion of community health centers/federally qualified health centers offering mailed screening; increasing the proportion that provide pre-paid return mail supplies with the screening kit; increasing the proportion of clinics monitoring both screening kit distribution and return; ensuring patients with abnormal tests can obtain colonoscopy; and increasing sustainability planning and support.

Qualitative Analysis of Colorectal Cancer Screening for African American and Hispanic Populations in Nebraska: an Application of the PRECEDE Framework.

Nationally and in Nebraska, African Americans (AA) and Hispanics have lower colorectal cancer (CRC) screening rates compared to non-Hispanic Whites. We aimed to obtain perspectives from AA and Hispanic cancer survivors and caregivers in Nebraska about CRC screening to improve outreach efforts. Data from four virtual focus groups (AA female, AA male, Hispanic rural, and Hispanic urban) conducted between April-August 2021 were analyzed using a directed content approach based on the Predisposing, Reinforcing, and Enabling Constructs in Educational Diagnosis and Evaluation (PRECEDE) model. Most of the 19 participants were female (84%) and survivors (58%). Across groups, awareness of colonoscopy was high, but awareness of fecal testing needed to be higher, with confusion about different types of fecal tests. Predisposing factors were trust in the health system; awareness of CRC screening; machismo; fear of cancer; embarrassment with screening methods; and negative perceptions of CRC screening. Enabling factors included provider recommendations, healthcare access, and insurance. Reinforcing factors included prioritizing personal health and having a support system. Suggestions to improve screening included increasing healthcare access (free or low-cost care), increasing provider diversity, health education using various methods and media, and enhancing grassroots health promotion efforts. Lack of awareness, accessibility issues, attitudes and perceptions of CRC and CRC screening, trust, and cultural and linguistic concerns are major issues that need to be addressed to reduce CRC screening disparities among AA and Hispanic adults.

Knowledge, Attitudes, and Beliefs About Colorectal Cancer Screening in Puerto Rico.

The purpose of this study was to describe the psychosocial factors influencing participation in colorectal cancer screening (CRCS) among Puerto Rican men and women. We conducted seven focus groups in metropolitan and rural areas of Puerto Rico (PR) with men and women (using gender specific groups) aged 50 to 80 years (n = 51) who were non-adherent to CRC guidelines. The focus group guide included questions related to colorectal cancer (CRC) and CRC screening knowledge, attitudes, and beliefs. We analyzed data using a modified grounded theory approach to identify emergent themes. Focus groups revealed seven major themes that represented barriers to CRCS: (1) lack of CRC knowledge, (2) lack of knowledge about colorectal cancer screening tests as well as the required preparation, (3) embarrassment, (4) low perceived benefit of CRCS and sense of fatalism, (5) transportation (mostly among participants in rural areas), (6) lack of time, and (7) financial burden. All participants understood the benefits of CRCS once the procedure was explained. Additionally, participants reported a lack of provider recommendation for CRCS. In this group of Puerto Rican participants who were non-adherent to CRCS, there were misconceptions about CRC, screening tests available, and preparation and testing procedures. Participants' low levels of knowledge and negative attitudes concerning CRCS and low reported provider recommendation were important deterrents to screening. These findings suggest the need for educational efforts to increase knowledge and attitudes about CRCS and improved patient-provider communication to reduce missed opportunities to recommend.

Smartphone Application to Reinforce Education Increases High-Quality Preparation for Colorectal Cancer Screening Colonoscopies in a Randomized Trial.

BACKGROUND & AIMS: Sufficient bowel preparation is crucial for successful screening and surveillance colonoscopy. However, rates of inadequate preparation are still high. We investigated the effects of reinforced patient education using a smartphone application software (APP) for colonoscopy preparation in participants in a CRC screening program. METHODS: We performed a prospective, endoscopist-blinded study of 500 patients undergoing split-dose bowel preparation for CRC screening or surveillance colonoscopies at multiple centers in Germany, from November 2017 through January 2019. Participants (n = 500) were given oral and written instructions during their initial appointment and then randomly assigned (1:1) to groups that received reinforced education starting 3 days before the colonoscopy (APP group) or no further education (controls). The primary outcome was quality of bowel preparation according to the Boston bowel preparation scale. Secondary outcomes included polyp and adenoma detection rates, compliance with low-fiber diet, split-dose laxative intake, perceived discomfort from the preparation procedure. RESULTS: The mean Boston bowel preparation scale score was significantly higher in the APP-group (7.6 ± 0.1) than in the control group (6.7 ± 0.1) (P < .0001). The percentage of patients with insufficient bowel preparation was significantly lower in the APP group (8%) than in the control group (17%) (P = .0023). The adenoma detection rate was significantly higher in the APP group (35% vs 27% in controls) (P = .0324). Use of the APP was accompanied by a lower level of non-compliance with correct laxative intake (P =.0080) and diet instructions (P = .0089). The APP group reported a lower level of discomfort during preparation (P < .0001). CONCLUSIONS: In a randomized trial, reinforcing patient education with a smartphone application optimized bowel preparation in the 3 days before colonoscopy, increasing bowel cleanliness, adenoma detection, and compliance in patients undergoing CRC screening or surveillance. ClinicalTrials.gov no: NCT03290157.

Prevalence and risk factors for sessile serrated lesions in an average risk colorectal cancer screening population.

BACKGROUND AND AIM: The reported prevalence and risk factors for sessile serrated lesions (SSLs) show significant variation. We aimed to specifically study the prevalence and potential risk factors of SSLs in an average risk colorectal cancer (CRC) screening population of Chinese subjects. METHODS: This is a case-control study of prospectively collected data from a territory-wide colorectal screening program in Hong Kong. Information on risk factors was obtained from questionnaires completed prior to screening colonoscopy. We compared subjects with SSLs against controls without these lesions to identify potential risk factors using multivariable logistic regression. RESULTS: Of 12 039 asymptomatic screening subjects, 6011 subjects received a screening colonoscopy with 2214 subjects (36.8%) having conventional adenomas, 486 subjects (8.1%) having hyperplastic polyps, and 85 subjects (1.4%) having SSLs only. Of these subjects, three had synchronous advanced adenomas and were excluded from the analysis. More than 60% of these lesions were in the proximal colon. We compared these 82 subjects with SSLs only and 3226 controls without any polyps. After multivariable logistic regression, age ≥ 66 years, smoking, and diabetes mellitus (DM) were significant independent risk factors for SSLs. CONCLUSION: In this study, we report the prevalence of SSLs to be 1.4%. Age ≥ 66 years, smoking, and DM were independent risk factors for these lesions. Our findings provide relevant new data that should be taken into consideration when designing region-specific surveillance programs for SSLs with the ultimate goal of reducing the risk of CRC.

Faecal haemoglobin concentration among subjects with negative FIT results is associated with the detection rate of neoplasia at subsequent rounds: a prospective study in the context of population based screening programmes in Italy.

OBJECTIVE: To estimate the predictive role of faecal haemoglobin (f-Hb) concentration among subjects with faecal immunochemical test (FIT) results below the positivity cut-off for the subsequent risk of advanced neoplasia (AN: colorectal cancer-CRC-or advanced adenoma). DESIGN: Prospective cohort of subjects aged 50-69 years, undergoing their first FIT between 1 January 2004 and 31 December 2010 in four population-based programmes in Italy. METHODS: All programmes adopted the same analytical procedure (OC Sensor, Eiken Japan), performed every 2 years, on a single sample, with the same positivity cut-off (20 µg Hb/g faeces). We assessed the AN risk at subsequent exams, the cumulative AN detection rate (DR) over the 4-year period following the second FIT and the interval CRC (IC) risk following two negative FITs by cumulative amount of f-Hb concentration over two consecutive negative FITs, using multivariable logistic regression models and the Kaplan-Meier method. RESULTS: The cumulative probability of a positive FIT result over the subsequent two rounds ranged between 7.8% (95% CI 7.5 to 8.2) for subjects with undetectable f-Hb at the initial two tests (50% of the screenees) and 48.4% (95% CI 44.0 to 53.0) among those (0.7% of the screenees) with a cumulative f-Hb concentration ≥20 µg/g faeces. The corresponding figures for cumulative DR were: 1.4% (95% CI 1.3 to 1.6) and 25.5% (95% CI 21.4 to 30.2) for AN; 0.17% (95% CI 0.12 to 0.23) and 4.5% (95% CI 2.8 to 7.1) for CRC. IC risk was also associated with cumulative f-Hb levels. CONCLUSION: The association of cumulative f-Hb concentration with subsequent AN and IC risk may allow to design tailored strategies to optimise the utilisation of endoscopy resources: subjects with cumulative f-Hb concentration ≥20 µg/g faeces over two negative tests could be referred immediately for total colonoscopy (TC), while screening interval might be extended for those with undetectable f-Hb.

A risk prediction tool for colorectal cancer screening: a qualitative study of patient and provider facilitators and barriers.

BACKGROUND: Despite proven effectiveness of colorectal cancer (CRC) screening, at least 35% of screen-eligible adults are not current with screening. Decision aids and risk prediction tools may help increase uptake, adherence, and efficiency of CRC screening by presenting lower-risk patients with options less invasive than colonoscopy. The purpose of this qualitative study was to determine patient and provider perceptions of facilitators and barriers to use of a risk prediction tool for advanced colorectal neoplasia (CRC and advanced, precancerous polyps), to maximize its chances of successful clinical implementation. METHODS: We conducted qualitative, semi-structured interviews with patients aged 50-75 years who were not current with CRC screening, and primary care providers (PCPs) at an academic and a U.S. Department of Veterans Affairs Medical Center in the Midwest from October 2016 through March 2017. Participants were asked about their current experiences discussing CRC screening, then were shown the risk tool and asked about its acceptability, barriers, facilitators, and whether they would use it to guide their choice of a screening test. The constant comparative method guided analysis. RESULTS: Thirty patients and PCPs participated. Among facilitators were the tool's potential to increase screening uptake, reduce patient risk, improve resource allocation, and facilitate discussion about CRC screening. PCP-identified barriers included concerns about the tool's accuracy, consistency with guidelines, and time constraints. CONCLUSIONS: Patients and PCPs found the risk prediction tool useful, with potential to increase uptake, safety, and efficiency of CRC screening, indicating potential acceptability and feasibility of implementation into clinical practice.

Nanostructured SmFeO3 Gas Sensors: Investigation of the Gas Sensing Performance Reproducibility for Colorectal Cancer Screening.

Among the various chemoresistive gas sensing properties studied so far, the sensing response reproducibility, i.e., the capability to reproduce a device with the same sensing performance, has been poorly investigated. However, the reproducibility of the gas sensing performance is of fundamental importance for the employment of these devices in on-field applications, and to demonstrate the reliability of the process development. This sensor property became crucial for the preparation of medical diagnostic tools, in which the use of specific chemoresistive gas sensors along with a dedicated algorithm can be used for screening diseases. In this work, the reproducibility of SmFeO3 perovskite-based gas sensors has been investigated. A set of four SmFeO3 devices, obtained from the same screen-printing deposition, have been tested in laboratory with both controlled concentrations of CO and biological fecal samples. The fecal samples tested were employed in the clinical validation protocol of a prototype for non-invasive colorectal cancer prescreening. Sensors showed a high reproducibility degree, with an error lower than 2% of the response value for the test with CO and lower than 6% for fecal samples. Finally, the reproducibility of the SmFeO3 sensor response and recovery times for fecal samples was also evaluated.

High prevalence of advanced colorectal neoplasia and serrated polyposis syndrome in Hodgkin lymphoma survivors.

BACKGROUND: Hodgkin lymphoma (HL) survivors treated with abdominal radiotherapy and/or alkylating chemotherapy have an increased risk of colorectal cancer (CRC). This study was aimed at evaluating the prevalence of colorectal neoplasia in HL survivors. METHODS: This multicenter cohort study assessed the diagnostic yield of advanced colorectal neoplasia detected by a first surveillance colonoscopy among HL survivors treated with abdominal radiotherapy and/or procarbazine. Advanced colorectal neoplasia included advanced adenomas (high-grade dysplasia, ≥25% villous component, or ≥10-mm diameter), advanced serrated lesions (dysplasia or ≥10-mm diameter), and CRC. The results were compared with those for a Dutch general population cohort that underwent a primary screening colonoscopy (1426 asymptomatic individuals 50-75 years old). This study demonstrated the results of a predefined interim analysis. RESULTS: A colonoscopy was performed in 101 HL survivors, who were significantly younger (median, 51 years; interquartile range [IQR], 45-57 years) than the general population controls (median, 60 years; IQR, 55-65 years; P < .001). The prevalence of advanced neoplasia was higher in HL survivors than controls (25 of 101 [25%] vs 171 of 1426 [12%]; P < .001). Advanced adenomas were detected in 14 of 101 HL survivors (14%) and in 124 of 1426 controls (9%; P = .08). The prevalence of advanced serrated lesions was higher in HL survivors than controls (12 of 101 [12%] vs 55 of 1426 [4%]; P < .001). Serrated polyposis syndrome was present in 6% of HL survivors and absent in controls (P < .001). CONCLUSIONS: HL survivors treated with abdominal radiotherapy and/or procarbazine have a high prevalence of advanced colorectal neoplasia. The implementation of a colonoscopy surveillance program should be considered.

Barriers of colorectal cancer screening in rural USA: a systematic review.

INTRODUCTION: Colorectal cancer (CRC) screening rates are lower in rural areas in the USA. To guide the design of interventions to improve CRC screening, a systematic review was conducted to identify CRC screening barriers for rural populations. METHODS: A search was conducted in four literature databases - Medline, CINAHL, Embase, and Scopus - for articles from 1998 to 2017 that examine CRC screening barriers in rural areas. This review included a total of 27 articles reporting perceived CRC screening barriers by rural residents or providers or examining factors associated with CRC screening of rural populations in the USA. RESULTS: The most frequently reported barriers were high screening cost and lack of insurance coverage, embarrassment or discomfort undergoing screening, lack of knowledge or perceived need on CRC screening, and lack of physician recommendation. These barriers were confirmed in quantitative studies examining their association with CRC screening status. Age, marital status, and race/ethnicity were the most frequently reported factors associated with CRC screening in rural areas. Lack of prevention attitude toward cancer, perceived lack of privacy, shortage of specialists, and distance to test facilities were reported as rural-specific barriers for CRC screening. CONCLUSIONS: Main barriers for CRC screening at both the individual and healthcare system level are identified in rural areas and they are in line with those found in urban areas in general. In particular, lack of prevention attitude toward cancer, perceived lack of privacy, shortage of specialists, and distance to test facilities disproportionately hamper CRC screening for rural Americans.

Knowledge and social engagement change in intention to be screened for colorectal cancer.

OBJECTIVE: Innovative technologies have been used to promote colorectal cancer (CRC) screening among the underserved. However, the impact of these innovative technologies on knowledge and social engagement likelihood as they relate to subsequent intention to be screened across different populations has not been fully explored. DESIGN: Using a pre-post-test design with an inflatable walk-through colon, we assessed changes in knowledge and social engagement likelihood across populations and their associations with intention to be screened in two community settings. One was a community setting in Washington State (WA); the other, a college campus in New Mexico (NM). Differential effects on knowledge and social engagement likelihood were examined across demographic groups (race/ethnicity, gender, age, education, insurance status, and geographic region). Finally, we assessed if changes in knowledge and social engagement likelihood were associated with CRC screening intention. RESULTS: NM males had greater gains in CRC knowledge than NM females; in WA, Hispanics, younger, less educated, and uninsured participants had greater gains in knowledge. NM females and younger WA participants were more likely to discuss CRC with their social networks than NM males and older WA participants. In WA, Hispanics and older adults reported greater intention to be screened for CRC. Change in social engagement likelihood, but not knowledge, was associated with intention to be screened. CONCLUSIONS: The effectiveness of health promotion technologies on knowledge and social engagement may vary across different demographic characteristics. Further, the importance of social engagement likelihood in interacting with intention to be screened was substantiated.

Tailored message interventions versus typical messages for increasing participation in colorectal cancer screening among a non-adherent population: A randomized controlled trial.

BACKGROUND: The purpose of this study was to examine the effectiveness and cost-efficiency of a tailored message intervention compared with a non-tailored message intervention for increasing colorectal cancer (CRC) screening rates among a non-adherent population, in a community-based client reminder program. METHODS: After a baseline survey for psychological segmentation, 2140 eligible individuals were randomly assigned either to a group with a tailored matched-message condition (N = 356), a group with a non-tailored unmatched-message condition (N = 355), or to two control groups, one using a typical message with a professional design (N = 717) and one without a professional design (N = 712). The main outcome measure was attendance rates in a community-organized CRC screening program within five months of receiving a print reminder. RESULTS: There was a significant difference in fecal occult blood test (FOBT) attendance rates at follow-up assessments between the tailored matched-message condition (14.0 %) and the control (9.9 %; OR = 1.48, p = 0.026), while there was no significant difference between the unmatched-message condition (11.0 %) and the control (OR = 1.12, p = 0.558), and between the matched-message condition and the unmatched-message condition (OR = 1.32, p = 0.219). The cost of a one-person increase in FOBT screening was 3,740 JPY for the tailored matched-message condition, while it was 2,747 JPY for the control. CONCLUSIONS: A tailored-message intervention for segmented individuals designed to increase CRC screening rates in a community-based client reminder program was significantly effective compared to a usual reminder, but not more effective than an unmatched message in a randomized controlled trial, and was not sufficiently effective to highlight its value from a cost perspective. Therefore, the tailored intervention including target segmentation needs to be improved for future implementation in a CRC screening program for a non-adherent population. TRIAL REGISTRATION: UMIN Clinical Trials Registry UMIN000004384 . Date of Registration: March 2011.

Invitation strategies for colorectal cancer screening programmes: The impact of an advance notification letter.

AIM: To estimate the impact of an advance notification letter on participation in sigmoidoscopy (FS) and fecal immunochemical test (FIT) screening. METHODS: Eligible subjects, invited in 3 Italian population based programmes using FS and in 5 using FIT, were randomised (1:1:1), within GP, to: A) standard invitation letter; B) advance notification followed after 1month by the standard invitation; and C) B+indication to contact the general practitioner (GP) to get advice about the decision to be screened. We calculated the 9-month attendance and the incremental cost of each strategy. We conducted a phone survey to assess GP's utilization and predictors of participation. RESULTS: The advance notification was associated with a 20% increase in the attendance among 15,655 people invited for FS (B vs A - RR: 1.17, 95% CI: 1.10-1.25; C vs A - RR: 1.19, 95% CI: 1.12-1.27); the incremental cost ranged between 10 and 9 Euros. Participation in FIT screening (N=23,543) was increased only with simple pre-notification (B vs A - RR: 1.06, 95% CI: 1.02-1.10); the incremental cost was 22.5 Euros. GP consultation rate was not increased in group C. CONCLUSIONS: An advance notification represents a cost-effective strategy to increase participation in FS screening; its impact on the response to FIT screening was limited.

Laypersons' views of material incentives for enhancing colorectal cancer screening.

BACKGROUND: Colorectal cancer (CRC) early detection improves health outcomes; screening programmes invest efforts in initiating invitations to target populations to be tested. Enhanced adherence is essential for reduction of morbidity and mortality. Participation rates in Israel are still relatively low. OBJECTIVE: To explore lay views regarding the concept of receiving material incentives in exchange for enhanced adherence to CRC screening. RESEARCH DESIGN: Qualitative study. Between November 2009 and February 2010 six focus group discussions were carried out in two urban, middle and low socio-economic status primary care clinics in a Northern city in Israel. Participants were eligible individuals for CRC screening, aged 50-68 (N = 24). Data analysis followed the principles of grounded theory, supported by qualitative software. RESULTS: Participants found administering incentives in exchange for CRC screening inappropriate on rational and moral grounds. They valued their relations with the medical team and the health system more than the potential gain expected. Individuals eligible for CRC screening perceived themselves as responsible for their health, admitting difficulties in realizing this responsibility. Incentives were reported unsuitable for solving reported screening difficulties and a potential harm to the doctor-patient relationship. CONCLUSIONS: Focus group participants expressed an unconventional voice towards the use of material incentives. They pointed to the need for focused support of health behaviour change and valued their autonomy. While a proportion of the invitees in the target population see the importance of screening and appreciate the HMO's initiative to invite them for testing, they also expressed their need for support from the HMO in realizing the recommended health behaviour.

Modelling the impact of bias in fecal immunochemical testing on long-term outcomes of colorectal cancer screening.

BACKGROUND: As the impact of unmanaged bias (i.e. systematic source of inaccuracy) in fecal immunochemical test (FIT) analytical performance on long-term colorectal cancer (CRC) outcomes is unknown, we assessed the impact bias in FIT performance in an ongoing FIT-based CRC screening program. METHODS: This study consisted of two parts: cross-sectional observational data analysis to estimate change in short-term outcomes and microsimulation modelling to estimate change in long-term outcomes assuming different levels of bias by assuming 15 % lower up to 15 % higher Hemoglobin detected in the stool compared to observed. Two scenarios were considered: bias occurring 1) one-time only, due to the occasional bias associated with the FIT kits used in 2020 and 2) consistently due to a constant bias associated with the FIT kits used from 2020 onwards. RESULTS: With a hypothetical bias of -15 % to +15 %, we observed a positivity rate ranging from 6.7 % to 7.8 %, and a detection rate for CRC between 0.65 % and 0.68 %. Single biases in FIT performance resulted in less than 0.1 % change in long-term CRC screening outcomes, while consistent biases resulted in a much larger change (up to 1.4 % in CRC cases and CRC-related deaths and up to 2.07 % in total costs). Detecting lower Hemoglobin concentrations resulted in a relatively larger change on long-term CRC outcomes in comparison to positive bias. CONCLUSIONS: Because of the substantial impact of consistent FIT bias, it is important to set evidence-based acceptance criteria of bias on long-term CRC screening outcomes and in particular, the introduction of an asymmetrical or upward shifted tolerance interval for FIT bias.

miRNA as a Biomarker for the Early Detection of Colorectal Cancer.

MicroRNAs (miRNAs) are short, non-coding RNA segments that can be detected in a variety of clinical samples, including serum, stool, and urine. While miRNAs were initially known for their effect on post-translational gene expression, the last decade of research has shown them to be promising biomarkers for the detection of many types of cancer. This paper explores the use of miRNA detection as a tool for colorectal cancer (CRC) screening. We discuss the current state of miRNA detection, compare it to the existing CRC screening tools, and highlight the advantages and drawbacks of this approach from a clinical and logistical perspective. Our research finds that miRNA-based tests for CRC show great potential, but that widespread clinical adoption will be conditional on future research overcoming key hurdles.