Guaiac Faecal Occult Blood Test Research Articles

Survey of Emergency Department Clinicians on the Utility of the Guaiac Fecal Occult Blood Test.

Emergency department (ED) clinicians utilize the guaiac fecal occult blood test (gFOBT) in their assessment of suspected gastrointestinal bleeding or unexplained anemia despite supporting evidence. ED clinicians' ability to predict the gFOBT results and how the gFOBT results could affect ED patient disposition has not been previously studied. Methods: From October 16, 2019, through September 15, 2020, we conducted a single-site survey of ED clinicians before and after performing gFOBTs during routine clinical care. Survey data were collected and retrospectively evaluated with unadjusted and multivariable regression analyses. We examined a total of 133 combined pre-gFOBT and post-gFOBT surveys. ED clinicians accurately predicted gFOBT results with an area under the receiver operating characteristic curve of 0.75 (95%CI, 0.66-0.85). Of clinician-predicted certain or very probable positive gFOBT results, only 79% were actually positive. In multivariable analyses, decreased hematocrit level (odds ratio (OR), 0.31/10% increase; 95%CI, 0.14-0.61), decreased red blood cell count (OR, 0.41/1x1012/L increase; 95%CI, 0.21-0.75), and absence of firm stool consistency (OR, 0.09; 95%CI, 0.01-0.42) were associated with positive gFOBT results (allP<.006). The most common reason for performing gFOBTs was black stool or suspected melena, followed by decreased hemoglobin level, red blood in stool, and suspected upper gastrointestinal tract bleeding. Before performing gFOBT, 50.8% of clinicians responded that the test results would change patient disposition, which decreased to 30.5% after the gFOBT result. We found that ED clinicians cannot predict the gFOBT results with high accuracy. A suspected GI bleed is the main reason for performing the test in the ED.

S986 Quality Initiative to Instate Accurate Guaiac Fecal Occult Blood Test Requests and Interpretation to Decrease Unnecessary Testing, Misdiagnosing, and Improve Cost in a Large Community Hospital

S986 Quality Initiative to Instate Accurate Guaiac Fecal Occult Blood Test Requests and Interpretation to Decrease Unnecessary Testing, Misdiagnosing, and Improve Cost in a Large Community Hospital

Abstract A140: Stool-Based Colorectal Cancer Screening During the COVID-19 Pandemic in a Safety-Net Setting: A Mixed-Methods Study

Abstract Purpose: The COVID-19 pandemic resulted in a marked decrease in preventative screening services for colorectal cancer, especially for more involved procedures like colonoscopies. Nationally, some health systems turned to more socially distanced options such as fecal immunochemical tests (FIT) and guaiac fecal occult blood tests (gFOBT). This study aimed to examine the effects of pandemic protocols on FIT and gFOBT utilization in a large municipal safety-net setting. Methods: This mixed methods study examined primary care visits in Los Angeles County’s municipal safety-net system. Semi-structured interviews were conducted with key stakeholders at multiple levels of the organization. These insights were combined with analysis of structured Electronic Health Record data on orders and procedure codes for completed colorectal cancer screening, including screening colonoscopies and FIT/gFOBT tests within the Los Angeles County health system’s ambulatory care and hospital-based providers, in order to explore trends in colorectal cancer screening during the pandemic. Results: Pre-pandemic, stool tests such as FIT and gFOBT were already the dominant initial screening modality for colorectal cancer in the health system. Across the system, FIT/gFOBT rates decreased during the initial wave of the pandemic and took significant time to recover to pre- pandemic levels. System stakeholders noted significant challenges with utilization of stool sample modalities as a screening method during the pandemic, including poor return rates and patient hesitancy to come in person to receive or return tests. Efforts were made to improve upon utilization, for example implementing distribution of stool tests like the FIT via mail. Rates of screenings may also have been affected by the increase in use telehealth services during the pandemic, by which providers often communicated with patients to order FIT/gFOBT tests during the period. Conclusion: Socially distanced approaches to colorectal cancer screening were an attractive solution for safety-net health systems looking to continue preventative care efforts in a pandemic setting. Our study highlights unique challenges exacerbated by the pandemic that should be considered in the context of future utilization of these screening modalities. In the post-pandemic term, emphasis on FIT/gFOBT utilization, in combination with lessons learned during the pandemic, could help to overcome delays in screening precipitated by COVID-19 by decreasing barriers to access for vulnerable populations (e.g. transportation access, work flexibility) in comparison to endoscopy. Citation Format: Willow Pastard, Cameron Kaplan, Chun Nok Lam, Laura Solano, Sonali Saluja, Sarah Axeen, John Thacker, Todd Schneberk, Jennifer Tsui. Stool-Based Colorectal Cancer Screening During the COVID-19 Pandemic in a Safety-Net Setting: A Mixed-Methods Study [abstract]. In: Proceedings of the 17th AACR Conference on the Science of Cancer Health Disparities in Racial/Ethnic Minorities and the Medically Underserved; 2024 Sep 21-24; Los Angeles, CA. Philadelphia (PA): AACR; Cancer Epidemiol Biomarkers Prev 2024;33(9 Suppl):Abstract nr A140.

Systematic review: Mortality associated with raised faecal immunochemical test and positive faecal occult blood results.

Faecal haemoglobin (f-Hb) testing is used in colorectal cancer (CRC) screening and increasingly to guide the investigation in patients with symptoms suggestive of CRC. Studies have demonstrated increased mortality with raised f-Hb. To assess the association of raised f-Hb with all-cause, non-CRC (any cause excluding CRC) and cause-specific mortality. We searched Medline and Embase on 9 February 2024 to identify papers reporting mortality after faecal immunochemical (FIT) or guaiac faecal occult blood tests (gFOBT). The primary outcome was all-cause mortality following a positive compared to a negative test. The search identified 3155 papers. Ten met the inclusion criteria: three reported gFOBT and seven reported FIT results, as screening tests. These reported a total of 14,687,625 f-Hb results. Elevated f-Hb was associated with an increased risk of all-cause, non-CRC and cause-specific mortality including death from cardiovascular, digestive and respiratory diseases. Crude risk ratios for all-cause mortality with a positive versus negative test were derived from six papers (three reporting gFOBT, three FIT). An increased risk was demonstrated in five, with RRs ranging from 1.11 (95% CI: 1.06-1.16) to 2.95 (95% CI: 2.85-3.05). For non-CRC mortality risk, RRs ranged from 1.09 (95% CI: 1.04-1.15) to 2.79 (95% CI: 2.70-2.89). We did not perform meta-analysis due to a limited number of papers reporting suitable results for each type of f-Hb test. All-cause, non-CRC and cause-specific mortality appear higher in those with raised f-Hb. Population-based studies are warranted to elicit whether this association occurs in symptomatic patients.

Factors associated with precancerous stomach lesions and progresion: A 7-year multi-center prospective cohort study on the low incidence of gastric cancer in central Saudi Arabia.

In Saudi Arabia (SA) no data are available on precancerous stomach lesions (PSLs) or the associated risk factors. We aimed to identify PSLs and investigate factors associated with PSLs and their progression. This 7-year prospective study screened for PSLs in asymptomatic Saudi patients aged 45-75 years in central SA (n = 35,640). Those who had high-sensitivity guaiac fecal occult blood tests (HSgFOBT+) and negative colonoscopy results (n = 1242) were subjected to upper GI endoscopy to identify PSLs and were followed up every 3 years or earlier, depending on the type of PSL. Factors associated with PSLs were investigated. The 7-year participation rate was 86.9% (1080/1242). The 7-year prevalence of PSLs was 30.9% (334/1080). The incidence rate of PSLs was 134 new cases/100,000 population/year, total population at risk - 35,640 and 44.3 new cases/1,000 persons/year among the 1080 participants with HSgFOBT+ and negative colonoscopy results. Among the 334 participants with PSLs, 8 (2.4%) had neoplastic progression to GC during the surveillance period. Age, Helicobacter pylori infection, smoking status, a diet with preserved salty foods, low income, and a family history of GC were associated with PSLs. The incidence of GC is low in central SA, but screening for PSLs among participants with HSgFOBT+ and negative colonoscopy findings may contribute to the early detection and subsequent treatment of GC. HP eradication, not smoking, normal body weight, and adhering to a healthy diet seem to be potential factors associated with the development of PSLs. Further studies are needed to search if such interventions would decrease the incidence of PSLs and progression to early GC.

Income differences in time to colon cancer diagnosis.

People with low income have worse outcomes throughout the cancer care continuum; however, little is known about income and the diagnostic interval. We described diagnostic pathways by neighborhood income and investigated the association between income and the diagnostic interval. This was a retrospective cohort study of colon cancer patients diagnosed 2007-2019 in Ontario using routinely collected data. The diagnostic interval was defined as the number of days from the first colon cancer encounter to diagnosis. Asymptomatic pathways were defined as first encounter with a colonoscopy or guaiac fecal occult blood test not occurring in the emergency department and were examined separately from symptomatic pathways. Quantile regression was used to determine the association between neighborhood income quintile and the conditional 50th and 90th percentile diagnostic interval controlling for age, sex, rural residence, and year of diagnosis. A total of 64,303 colon cancer patients were included. Patients residing in the lowest income neighborhoods were more likely to be diagnosed through symptomatic pathways and in the emergency department. Living in low-income neighborhoods was associated with longer 50th and 90th-percentile symptomatic diagnostic intervals compared to patients living in the highest income neighborhoods. For example, the 90th percentile diagnostic interval was 15 days (95% CI 6-23) longer in patients living in the lowest income neighborhoods compared to the highest. These findings reveal income inequities during the diagnostic phase of colon cancer. Future work should determine pathways to reducing inequalities along the diagnostic interval and evaluate screening and diagnostic assessment programs from an equity perspective.

The association between organised colorectal cancer screening strategies and reduction of its related mortality: a systematic review and meta-analysis

BackgroundTo assess the long-term association between organised colorectal cancer (CRC) screening strategies and CRC-relate mortality.MethodsWe systematically reviewed studies on organised CRC screening through PubMed, Ovid Medline, Embase and Cochrane from the inception. We retrieved characteristics of organised CRC screening from included literature and matched mortality (over 50 years) of those areas from the International Agency for Research on Cancer in May 2023. The variations of mortality were reported via the age-standardised mortality ratio. A random-effects model was used to synthesis results.ResultsWe summarised 58 organised CRC screening programmes and recorded > 2.7 million CRC-related deaths from 22 countries where rollout screening programmes were performed. The CRC screening strategy with faecal tests (guaiac faecal occult blood test (gFOBT) or faecal immunochemical tests (FIT)) or colonoscopy as the primary screening offer was associated with a 41.8% reduction in mortality, which was higher than those offered gFOBT (4.4%), FIT (16.7%), gFOBT or FIT (16.2%), and faecal tests (gFOBT or FIT) or flexible sigmoidoscopy (16.7%) as primary screening test. The longer duration of screening was associated with a higher reduction in the pooled age-standardised mortality ratio. In particular, the pooled age-standardised mortality ratio became non-significant when the screening of FIT was implemented for less than 5 years.ConclusionsA CRC screening programme running for > 5 years was associated with a reduction of CRC-related mortality. Countries with a heavy burden of CRC should implement sustainable, organised screening providing a choice between faecal tests and colonoscopy as a preferred primary test.

Rectally obtained fecal samples can be used for fecal occult blood testing in dogs, and fecal immunochemical tests do not detect canine or feline blood.

The first objective was to determine if the sample collection method (naturally voided vs digital rectal examination collection) affected fecal occult blood test (FOBT) results. The second objective was to assess the ability of human fecal hemoglobin immunochemical tests to detect canine and feline blood. 308 privately owned dogs, healthy and sick. Guaiac FOBTs were performed on paired voided and rectally obtained canine fecal samples. The kappa statistic was used to assess agreement between the 2 collection methods, and a multivariate regression model was used to identify factors associated with a positive FOBT. Two fecal immunochemical tests (FITs; Hemosure One Step and OC-Light S) were tested with serially diluted human, canine, and feline blood. Voided and rectally obtained samples showed strong FOB-positivity agreement (k = 0.80), with 92.5% concordance and only 13/308 dogs negative on void but positive on rectal. Multivariate analysis showed dogs with gastrointestinal disease (P = .0008, rectal; P = .0001, void) were more likely and heavier dogs (P = .0037, rectal; P = .0022 void) were less likely to test FOBT positive. Health status, fasting status, NSAID use, and age were associated with FOBT results on univariate, but not multivariate, analysis. FITs did not detect canine or feline blood at any concentration while human blood performed as expected. Rectally obtained fecal samples can be reliably used for FOBTs. Human FITs may not be suitable for companion animals, but evaluation of other available tests is needed.

Evaluation of polypus growth among fecal immunochemical test positive patients

Background: Colorectal cancer is a difficult clinical condition to treat all over the world. Adenomatous polyps are thought to be cancer precursors. A colonoscopy is required to detect and confirm ulcerative colitis mucosal healing. Different screening procedures, including as colonoscopy, fecal immunochemistry test (FIT), guaiac fecal occult blood test (gFOBT), computed tomography (CT) colonography, and others, are used to detect polyps or ulcers early. Although the gold standard colonoscopy serves both diagnostic and therapeutic purposes, the FIT can identify advanced adenoma or established cancer, as well as the mucosal condition of ulcerative colitis. The FIT is a less costly approach for detecting colonic disease that is appropriate for our demographic. The aim of the study was to observe the type of polypus growth among FIT positive patients. Methods: This observational cross-sectional study was conducted at the department of colorectal surgery, Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh. The study duration was 1 year, from July 2019 to August 2020. At the initial stage, a total of 510 participants were selected among the patients attending the outdoor department of BSMMU colorectal surgery following the inclusion and exclusion criteria. Results: The male: female ratio was 1.7:1 in our study. 48.28% were from the age group of 50-59 years. The most common clinical presentation or symptom among the participants was constipation, observed in 81.03% of cases. 39.66% of the participants had abdominal pain, 32.76% had rectal mucus discharge, 12.07% had observed changes in their bowel movement, while 6.90% had a lack of appetite. Among the participants, 42 had pedunculated polyp, while 16 had sessile polyps. A total of 55.17% had non-advanced pedunculated polyp, 22.41% had non-advanced sessile polyp, 17.24% had advanced grade pedunculated polyp, while the remaining 5.17% had advanced grade sessile polyp. Histopathological findings revealed that 44.83% of the participants had tubular adenoma with low grade dysplasia (LGD) among the non-advanced pedunculated polyps’ cases, 17.24% had tubular adenoma with LGD among the non-advances sessile cases. Among the advanced pedunculated polyps’ cases, 6.90% had tubular adenoma with high grade dysplasia (HGD), 3 (5.17%) had villous adenoma with dysplasia, and 2 (3.45%) had tubulovillous with dysplasia. Among the 3 advances sessile polyps cases, 3.45% had tubular adenoma with HGD, while 1 patient had malignancy. Conclusions: It was observed that FIT positive patients had a higher frequency of pedunculated polyps, specifically advanced pedunculated polyps. Both sessile and pedunculated polyps had a high prevalence among patients aged between 50-59 years.

Epidemiology, Risk Factors for Gastric Cancer and Surveillance of Premalignant Gastric Lesions: A Prospective Cohort Study of Central Saudi Arabia.

(1) Background: Saudi Arabia (SA) is a country with a low incidence of gastric cancer (GC). In this study, we sought to assess the epidemiology of GC, its clinicopathological profiles, and its association with risk factors as well as to identify premalignant gastric lesions (PGL) and examine neoplastic progression. (2) Methods: This five-year prospective study screened for GC and PGL in asymptomatic Saudi patients, aged 45-75 years (n = 35,640) and living in Al Kharj, Riyadh province in central SA. Those who were positive in a high-sensitivity guaiac fecal occult blood test (HSgFOBT+) and had negative results in colonoscopy offered to undergo upper GI endoscopy (n = 1242). Factors associated with GC were examined. (3) Results: The five-year participation rate was 87% (1080/1242). The incidence rate of GC was 26.9 new cases per 100,000 population per year (9.6 new cases per year/total population at risk-35,640), and it was 8.9 cases per 1000 persons per year among the 1080 subjects with HSgFOBT+ and negative colonoscopy results. The five-year mortality rate was 67% among patients with GC (n = 48), 3.0% among participants in the gastric screening program (n = 1080) and 0.09% among the original population participating in the colorectal screening program (n = 35,640). Intestinal-type adenocarcinoma was the most frequent type (77%), with the tumor most commonly located in the antrum (41%). Overall, 334 participants had PGL, and seven of them (2.1%) showed neoplastic progression to GC during the follow-up. Factors associated with GC were age, Helicobacter pylori (HP) infection, obesity (body mass index BMI > 30), smoking, a diet of salty preserved foods, low income and a family history of GC. (4) Conclusions: The incidence of GC is low in central SA, but screening for PGL and GC among patients with HSgFOBT+ and negative colonoscopy may prevent or result in the early treatment of GC. HP eradication, normal body weight, not smoking and adhering to a healthy diet can reduce the risk of GC. The resulting data provide important input for the improvement of national guidelines.

Screening for Colorectal Cancer in Asymptomatic Average-Risk Adults: A Guidance Statement From the American College of Physicians (Version 2).

The purpose of this updated guidance statement is to guide clinicians on screening for colorectal cancer (CRC) in asymptomatic average-risk adults. The intended audience is all clinicians. The population is asymptomatic adults at average risk for CRC. This updated guidance statement was developed using recently published and critically appraised clinical guidelines from national guideline developers since the publication of the American College of Physicians' 2019 guidance statement, "Screening for Colorectal Cancer in Asymptomatic Average-Risk Adults." The authors searched for national guidelines from the United States and other countries published in English using PubMed and the Guidelines International Network library from 1 January 2018 to 24 April 2023. The authors also searched for updates of guidelines included in the first version of our guidance statement. The Appraisal of Guidelines for Research and Evaluation II (AGREE II) instrument was used to assess the quality of eligible guidelines. Two guidelines were selected for adoption and adaptation by raters on the basis of the highest average overall AGREE II quality scores. The evidence reviews and modeling studies for these 2 guidelines were also used to synthesize the evidence of diagnostic test accuracy, effectiveness, and harms of CRC screening interventions and to develop our guidance statements. Clinicians should start screening for colorectal cancer in asymptomatic average-risk adults at age 50 years. Clinicians should consider not screening asymptomatic average-risk adults between the ages of 45 to 49 years. Clinicians should discuss the uncertainty around benefits and harms of screening in this population. Clinicians should stop screening for colorectal cancer in asymptomatic average-risk adults older than 75 years or in asymptomatic average-risk adults with a life expectancy of 10 years or less. Clinicians should select a screening test for colorectal cancer in consultation with their patient based on a discussion of benefits, harms, costs, availability, frequency, and patient values and preferences. Clinicians should select among a fecal immunochemical or high-sensitivity guaiac fecal occult blood test every 2 years, colonoscopy every 10 years, or flexible sigmoidoscopy every 10 years plus a fecal immunochemical test every 2 years as a screening test for colorectal cancer. Clinicians should not use stool DNA, computed tomography colonography, capsule endoscopy, urine, or serum screening tests for colorectal cancer.

Interval cancers in a national colorectal screening programme based on faecal immunochemical testing: Implications for faecal haemoglobin concentration threshold and sex inequality.

To compare interval cancer proportions (ICP) in the faecal immunochemical test (FIT)-based Scottish Bowel Screening Programme (SBoSP) with the former guaiac faecal occult blood test (gFOBT)-based SBoSP and investigate associations between interval cancer (IC) and faecal haemoglobin concentration (f-Hb) threshold, sex, age, deprivation, site, and stage. The ICP data from first year of the FIT-based SBoSP and the penultimate year of the gFOBT-based SBoSP were compared in a prospective cohort design. With FIT, 801 colorectal cancers (CRCs) were screen detected (SDC), 802 were in non-participants, 548 were ICs, 39 were colonoscopy missed and 72 were diagnosed after incomplete screening; with gFOBT: 540, 904, 556, 45, and 13, respectively. FIT had a significantly higher proportion of SDC compared to IC than gFOBT. For FIT and gFOBT, ICP was significantly higher in women than men. As f-Hb threshold increased, ICP increased and, for any f-Hb threshold for men, a lower threshold was required for comparable ICP in women. In Scotland, the current threshold of ≥80 µg Hb/g faeces would have to be lowered to ≥40 µg Hb/g faeces for women to achieve sex equality for ICP. In the FIT-based SBoSP, there were four times as many stage I SDC than IC. This was reversed in advanced stages, with twice as many stage IV CRC diagnosed as IC versus SDC. Reducing the numbers of IC requires lowering the f-Hb threshold. Using different f-Hb thresholds for women and men could eliminate the sex disparity, but with additional colonoscopy.

Colorectal cancer: A narrative review

Colorectal cancer is the second most common cancer in women and a third in men globally. Its mortality is rising with a major contribution from a low- and middle-income countries. We highlight the current trends in the demographics, histopathological patterns and management of colorectal cancer to improve care and prognosis of the disease. A search of PubMed, Hinari, Google Scholar, Directory of Open Access Journals and African Journal Online was made. Only full articles were reviewed. Most colorectal tumours develop via a multistep process involving a series of histological, morphological and genetic changes that accumulate over time. Clinical features are varied, non-specific and dependent on the site of the tumour and the extent of luminal narrowing caused by the tumour. Colonoscopy is vital in establishing the diagnosis of colorectal cancer as it allows visualization of the colon and permits tumour biopsy. Treatment is both multimodal and multidisciplinary involving surgery, radiation therapy and cytotoxic therapy. The incidence and mortality may be significantly reduced by screening which can either be invasive or non-invasive. The non-invasive uses tumour markers such as guaiac faecal occult blood test or immunohistochemical faecal occult blood test while the invasive tests include the flexible sigmoidoscopy and colonoscopy. The burden of colorectal cancer may likely increase due to its current trend and ageing population; deficiency in cancer prevention efforts as a result of lack of government policies, low level of awareness and inadequacy of cancer registries. We advocate collaborative efforts to combat the scourge of the disease.

Artificial intelligence in colorectal cancer screening.

KEY POINTS Colorectal cancer (CRC) is one of the most commonly diagnosed cancers in Canada and leads to death in 10% of cases.[1][1] In Canada, organized CRC screening usually involves a fecal immunochemical test or guaiac fecal occult blood test every 2 years for individuals aged 50–75 years. For

Colon Capsule Endoscopy in the Diagnosis of Colon Polyps: Who Needs a Colonoscopy?

Colon screening programs have reduced colon cancer mortality. Population screening should be minimally invasive, safe, acceptably sensitive, cost-effective, and scalable. The range of screening modalities include guaiac or immunochemical fecal occult blood testing and CT colonography and colonoscopy. A number of carefully controlled studies concur that second-generation capsule endoscopy has excellent sensitivity for polyp detection and a high negative predictive value. Colon capsules fulfill the screening expectation of safety, high sensitivity for polyp detection, and patient acceptance, and appear to straddle the divide between occult blood testing and colonoscopy. While meeting these criteria, there remains the challenges of scaling, capsule practitioner training, resource allocation, and implementing change of practice. Like CT colonography, capsule screening presents the clinician with a decision on the threshold for colonoscopy referral. Overall, colon capsules are an invaluable tool in polyp detection and colon screening and offer a filter that determines “who needs a colonoscopy?”.

Do faecal test-based colorectal cancer screening pilots provide data that are reflected in subsequent programmes? Evidence from interval cancer proportions.

Guidelines on colorectal cancer (CRC) screening with guaiac faecal occult blood tests (gFOBTs) and faecal immunochemical tests (FITs) include the need for a pilot before a programme is introduced. Interval cancers (ICs), cancers arising after a negative screening test result but before the next scheduled invite, are important indicators of programme quality. Our aim was to compare IC in the gFOBT-based Scottish Bowel Screening Programme (SBoSP), a FIT-based pilot, and the FIT-based SBoSP, to assess if the pilot provided data that was reflected in the subsequent programme. The IC proportions (ICPs) data ([IC/(IC + screen detected CRC)] x 100) from the penultimate year of the gFOBT-based SBoSP, the 6-month pilot and the first year of the FIT-based SBoSP were compared. To ensure appropriate comparison, these data were only from the two pilot NHS Boards. For all participants, and females and males, the ICPs were very similar in the gFOBT-based SBoSP and the pilot. The faecal haemoglobin concentration (f-Hb) threshold for the pilot was set at ≥80μg Hb/g faeces. However, in marked contrast, in the FIT-based SBoSP, at the same threshold, the ICPs were lower. In all three groups, the ICPs were higher in females than in males. Data on variables in pilots, including ICP, can be informative, but only if variables such as FIT system are held consistent between pilot and programme. Lowering the f-Hb threshold for females to give the same ICP as males might be a strategy to minimise sex inequality.

SA28 Systematic Review of Screening Interventions for Colon and Rectal Cancer, from the Point of View of the Instituto Mexicano Del Seguro Social

Evaluate the sensitivity and specificity of the fecal immunochemical test (FIT) for the diagnosis of adult patients with colorectal cancer (CRC) compared to the guaiac fecal occult blood test (gFOBT), Conventional colonoscopy (CC), and flexible sigmoidoscopy (FS), existing in the Instituto Mexicano del Seguro Social (IMSS). Methodology: We conducted a systematic review to evaluate the sensitivity and specificity of the FIT test compared to the screening options currently available at the IMSS to diagnose of adult patients with CRC.

Using Intervention Mapping to Develop a Theory-Based Intervention to Promote Colorectal Cancer Screening in Egypt.

Background:Colorectal cancer (CRC) incidence and mortality rates are increasing in Egypt. Because no national screening guidelines exist, developing an effective evidence-based screening intervention could lower rates by early detection of pre-cancerous and cancerous lesions and polyps. This paper describes the development of a CRC screening intervention in Alexandria, Egypt using Intervention Mapping (IM). Materials and Methods:Between September 2019 and March 2020, the successive steps of the IM process were completed. Beginning with the needs assessment, we conducted a literature review, held focus groups with residents of Alexandria, and conducted interviews with local gastroenterologists and oncologists. Program objectives and target audience were determined before designing the program components and implementation plan. Using the PRECEDE-PROCEED theoretical model, predisposing, reinforcing, and enabling screening barriers were assessed. Finally, we developed a Standard Operating Procedures manual detailing aspects of the intervention and evaluation to serve as a model for an expanded screening program. Results:The needs assessment, e.g., literature review, seven focus groups (N=61 participants) and interviews (N=17 participants), indicated that barriers among residents included CRC knowledge deficits, fear/anxiety regarding testing, high cost, and lack of accessibility. Physicians believed CRC testing should only be performed for high risk individuals. Findings from each step of the process informed successive steps. Our final intervention consisted of training components for medical students (Health Champions) who would deliver the intervention to patients in primary care waiting rooms, providing short descriptions of CRC risks and screening, educational brochures, and distributing vouchers for no-cost guaiac fecal occult blood test kits. Health Champions would then follow up with the patients, providing results and referrals for no-cost colonoscopy testing for those with abnormal results. Conclusion:Utilizing the IM steps successfully led to development of a theory-based CRC screening intervention for Egypt. Next steps include the implementation of a feasibility pilot intervention.

Benefit of Biennial Fecal Occult Blood Screening on Colorectal Cancer in England: A Population-Based Case-Control Study.

BackgroundThe English national bowel cancer screening program offering a guaiac fecal occult blood test began in July 2006. In randomized controlled trials of guaiac fecal occult blood test screening, reductions in mortality were accompanied by reductions in advanced stage colorectal cancer (CRC). We aimed to evaluate the effect of participation in the national bowel cancer screening program on stage-specific CRC incidence as a likely precursor of a mortality effect.MethodsIn this population-based case-control study, cases were individuals diagnosed with CRC aged 60-79 years between January 1, 2012, and December 31, 2013. Two controls per case were matched on geographic region, gender, date of birth, and year of first screening invitation. Screening histories were extracted from the screening database. Conditional logistic regression with correction for self-selection bias was used to estimate odds ratios (odds ratios corrected for self-selection bias [cOR]) and 95% confidence intervals (CIs) by Duke stage, sex, and age.Results14 636 individuals with CRC and 29 036 without were eligible for analysis. The odds of CRC (any stage) were increased within 30 days of a screening test and decreased thereafter. No reduction in CRC (any stage) among screened individuals compared with those not screened was observed (cOR = 1.00, 95% CI = 0.89 to 1.15). However, screened individuals had lower odds of Duke stage D CRC (cOR = 0.68, 95% CI = 0.50 to 0.93). We estimate 435 fewer Duke D CRC by age 80 years in 100 000 people screened biennially between ages 60 and 74 years compared with an unscreened cohort.ConclusionThe impact of colorectal screening on advanced CRC incidence suggests that the program will meet its aim of reducing mortality.

Cause of Death, Mortality and Occult Blood in Colorectal Cancer Screening.

Simple SummaryColorectal cancer (CRC) screening participants with significant traces of hemoglobin in their stool have been reported to have higher mortality and different causes of death (other than CRC) compared to those without. We aimed to investigate these differences among screening participants after 33 years of follow-up. We confirmed that participants with detectable fecal hemoglobin were more likely to die in the study period and to die from different causes, such as cardiovascular and endocrine and hematological diseases, compared to those without detectable fecal hemoglobin. This confirms that fecal hemoglobin may have potential as a marker for diseases not directly related to the colon and rectum and may represent a target for future preventive measures.Fecal hemoglobin (f-Hb) detected by the guaiac fecal occult blood test (gFOBT) may be associated with mortality and cause of death in colorectal cancer (CRC) screening participants. We investigated this association in a randomly selected population of 20,694 participants followed for 33 years. We followed participants from the start of the Hemoccult-II CRC trial in 1985–1986 until December 2018. Data on mortality, cause of death and covariates were retrieved using Danish national registers. We conducted multivariable Cox regressions with time-varying exposure, reporting results as crude and adjusted hazard ratios (aHRs). We identified 1766 patients with at least one positive gFOBT, 946 of whom died in the study period. Most gFOBT-positive participants (93.23%) died of diseases unrelated to CRC and showed higher non-CRC mortality than gFOBT-negative participants (aHR: 1.20, 95% CI 1.10–1.30). Positive gFOBT participants displayed a modest increase in all-cause (aHR: 1.28, 95% CI: 1.18–1.38), CRC (aHR: 4.07, 95% CI: 3.00–5.56), cardiovascular (aHR: 1.22, 95% CI: 1.07–1.39) and endocrine and hematological mortality (aHR: 1.58, 95% CI: 1.19–2.10). In conclusion, we observed an association between positive gFOBT, cause of death and mortality. The presence of f-Hb in the gFOBT might indicate the presence of systemic diseases.