Colorectal cancer prevention. An approach to increasing compliance in a faecal occult blood test screening programme

Colorectal Cancer Screening with Faecal Occult Blood Testing: Community Intention, Knowledge, Beliefs and Behaviour

The objective of this study was to examine the current community intention, knowledge, beliefs and behaviour regarding colorectal cancer (CRC) screening with faecal occult blood testing (FOBT). A cross sectional telephone survey of the general population was conducted in Queensland, Australia. A random sample of 1,136 residents aged 40-80 years were invited to participate in the survey with a response rate of 77.8%. 77.5% (95% confidence interval [95% CI]: 74.0 to 80.7%) of respondents reported that they would participate in CRC screening by FOBT if recommended to do so by doctors or health authorities. Screening intention was significantly associated with interest in further information concerning CRC or CRC screening (odds ratio: 6.7; 95% CI: 3.4 - 13.1), belief that CRC screening is necessary for persons without symptoms (5.0; 95% CI: 1.5 -17.1), and belief that treating bowel cancer in the early stages increases a person's chance of survival (5.1; 95% CI: 2.6 - 9.9). Knowledge of seeking medical advice (2.8; 95% CI: 0.9 - 8.7) and diarrhoea/constipation as a symptom of CRC (1.7; 95% CI: 0.9 - 3.2), self-initiated screening behaviour (1.5; 95% CI: 0.8 -2.9), and medical check a couple of times a year or more (2.4; 95% CI: 0.9 - 6.5) were also marginally significantly associated with screening intention. Community intention to screen for CRC with FOBT may have increased over recent years. Screening intention is associated with community knowledge, attitudes/beliefs and behaviour.

Implementation and process evaluation of a workplace colorectal cancer screening program in eastern Washington

Colorectal cancer screening is a life-saving intervention, but screening rates are low. The authors implemented and evaluated the Spokane Colorectal Cancer Screening Program-a novel worksite intervention to promote colorectal cancer screening that used a combination of evidence-based strategies recommended by the Guide to Community Preventive Services, as well as additional strategies. Over a period of approximately 3 months, participating worksites held one or more physician-led seminars about colorectal cancer screening for employees. They also distributed free fecal immunochemical tests at the worksite to employees 50 years and older, and they provided test results to employees and their primary care physician. The authors measured attendance at seminars, test kits taken and returned, employee awareness of the program, and colorectal cancer screening rates in participating and comparison worksites. It is estimated that 9% of eligible employees received kits at the worksite, and 4% were screened with these kits. The Spokane Colorectal Cancer Screening Program was a promising pilot test of an innovative worksite screening program that successfully translated evidence-based strategies into practical use in a brief period of time, and it merits a larger study to be able to test its effects more rigorously.

Guaiac versus immunochemical tests: faecal occult blood test screening for colorectal cancer in a rural community

OBJECTIVE

To describe patient participation and clinical performance in a colorectal cancer (CRC) screening program utilising faecal occult blood test (FOBT).

METHODS

A community-based intervention was conducted in a small, rural community in north Queensland, 2000/01. One of two FOBT kits--guaiac (Hemoccult-II) or immunochemical (!nform)--was assigned by general practice and mailed to participants (3,358 patients aged 50-74 years listed with the local practices).

RESULTS

Overall participation in FOBT screening was 36.3%. Participation was higher with the immunochemical kit than the guaiac kit (OR=1.9, 95% CI 1.6-2.2). Women were more likely to comply with testing than men (OR=1.4, 95% CI 1.2-1.7), and people in their 60s were less likely to participate than those 70-74 years (OR=0.8, 95% CI 0.6-0.9). The positivity rate was higher for the immunochemical (9.5%) than the guaiac (3.9%) test (chi2=9.2, p=0.002), with positive predictive values for cancer or adenoma of advanced pathology of 37.8% (95% CI 28.1-48.6) for !nform and 40.0% (95% CI 16.8-68.7) for Hemoccult-II. Colonoscopy follow-up was 94.8% with a medical complication rate of 2-3%.

CONCLUSIONS

An immunochemical FOBT enhanced participation. Higher positivity rates for this kit did not translate into higher false-positive rates, and both test types resulted in a high yield of neoplasia.

IMPLICATIONS

In addition to type of FOBT, the ultimate success of a population-based screening program for CRC using FOBT will depend on appropriate education of health professionals and the public as well as significant investment in medical infrastructure for colonoscopy follow-up.

Colorectal cancer screening: health impact and cost effectiveness

BACKGROUND

Colorectal cancer is the second leading cause of cancer-related death in the United States, yet recommended screenings are not delivered to most people. This assessment of colorectal cancer screening's value to the U.S. population is part of the update to a 2001 ranking of recommended clinical preventive services found in the accompanying article. This article describes the burden of disease prevented and cost-effectiveness as a result of offering patients a choice of colorectal cancer screening tools.

METHODS

Methods used were designed to ensure consistent estimates across many services and are described in more detail in the companion articles. In a secondary analysis, the authors also estimated the impact of increasing offers for colorectal cancer screening above current levels among the current cross-section of adults aged 50 and older.

RESULTS

If a birth cohort of 4 million were offered screening at recommended intervals, 31,500 deaths would be prevented and 338,000 years of life would be gained over the lifetime of the birth cohort. In the current cross-section of people aged 50 and older, 18,800 deaths could be prevented each year by offering all people in this group screening at recommended intervals. Only 58% of these deaths are currently being prevented. In year 2000 dollars, the cost effectiveness of offering patients aged 50 and older a choice of colorectal cancer screening options is $11,900 per year of life gained.

CONCLUSIONS

Colorectal cancer screening is a high-impact, cost-effective service used by less than half of persons aged 50 and older.

The efficacy of tailored print materials in promoting colorectal cancer screening: results from a randomized trial involving callers to the National Cancer Institute's Cancer Information Service

In this large randomized trial among callers to the Cancer Information Service (CIS), tailored print materials were tested for efficacy in promoting colorectal cancer (CRC) screening (fecal occult blood test [FOBT], flexible sigmoidoscopy, or colonoscopy). All participants completed baseline interviews at the end of their usual service calls to the CIS, as well as short-term (6-month) and longer-term (14-month) telephone follow-up interviews. The study sample (n = 4,014) was restricted to English-speaking CIS callers 50 + years of age, who would be eligible for CRC screening at 14 months follow-up and did not call the CIS about CRC or CRC screening. Four experimental conditions were compared: a single untailored (SU) mailout of print material (the control condition); a single tailored (ST) mailout of print material; four (multiple) tailored (MT) mailouts of print materials spanning 12 months, all of which were tailored to information obtained at baseline; and four (multiple) retailored (MRT) mailouts also spanning 12 months, with retailoring of the print materials (mailouts 2, 3, and 4) based on updated information obtained from the 6-month follow-up interviews. Consistent with the main hypothesis of this trial, a significant linear trend across the SU, ST, MT, and MRT groups was found at 14 months (42%, 44%, 51%, and 48%, respectively, p = 0.05). Only for MT was there a significant difference compared with SU (p = 0.03) for the sample as a whole, while no differences were found for MT vs. MRT at 14 months. Significant moderator effects in the predicted direction were found among females, younger participants, and among those with a history of CRC screening, all of which involved the SU vs. MT MRT comparisons. Only among younger participants (ages 50-59) was there a difference between SU vs. ST at 14 months. Given these results, we conclude from this trial the following: (1) the MRT intervention failed to show added benefit beyond the MT intervention, (2) the significant intervention effects involving the MT and MRT conditions can be explained by tailoring and/or the longitudinal nature of both interventions, and (3) the most compelling evidence in support of tailoring was found for the ST condition among younger participants, where a significant need for interventions exists at the national level. Directions for future research are discussed in light of the results summarized above.

Screening for bowel cancer among NSW adults with varying levels of risk: a community survey

OBJECTIVE

To estimate the extent and modality of screening for colorectal cancer in NSW among community-dwelling adults aged over 40 with varying degrees of familial risk.

DESIGN

Cross-sectional telephone survey with participants randomly selected from the electronic NSW telephone directory.

MAIN RESULTS

5.7% of people at average risk aged 40-49 report having had at least one faecal occult blood test (FOBT) in the previous five years, compared with 18.4% of those at average risk aged 50 and over. Of those at above-average risk (by age and familial risk), 7.9% reported that they had had an FOBT in the previous five years. Around 5% of respondents aged 40-49 and 10% of those aged 50+ reported having had a colonoscopy/sigmoidoscopy for screening within the previous five years, compared with 30% of those at above-average risk. People with medical insurance were more likely to have undergone a screening test (either FOBT or sigmoidoscopy/colonoscopy), than those without insurance (PR = 1.30; 95% CI 1.02-1.67). Compared with those employed full time, those who were retired (PR = 1.45 95% CI 1.01-2.09) and those who reported home duties (PR = 1.54 95% CI 1.01-2.36) were slightly, but significantly more likely to report having had a test. As perception of personal risk for colorectal cancer increased, so did the likelihood of having had a screening test within the previous five years (PR = 1.19; 95% CI 1.05-1.35).

CONCLUSION

We have reported important baseline data with which to compare the progress of both pilot screening programs and more widespread implementation of colorectal screening in Australia. In particular, we have highlighted the need for greater participation in screening for those at increased familial risk.

Socio-demographic correlates of screening intention for colorectal cancer

OBJECTIVE

To assess the relationship between socio-demographic factors and screening intention for colorectal cancer (CRC).

METHODS

A cross-sectional survey of a random sample of 884 Queenslanders aged 40-80 years was conducted using a computer-assisted telephone interviewing system. The factors measured included socio-demographic characteristics, personal history of CRC, knowledge of others with CRC and perceived symptom status. Chi-squared and Monte Carlo estimates of Fisher Exact Tests were performed to determine the associations between socio-demographic factors and screening intention. In multivariate analyses, multinomial logistic regression (MNLR) was utilised to examine potential determinants of screening intention.

RESULTS

77.5% (95% CI 74.0%-80.7%) of the respondents indicated their intention to participate in CRC screening if it were recommended by their doctor or health authorities. The likelihood ratio chi-squared tests in the MNLR analyses show that age (chi(df = 6)2 = 15.0; p = 0.02), education (chi(df = 8)2 = 19.4; p = 0.01), perceived symptom status (chi(df = 4)2 = 22.9; p = 0.00), sex (chi(df = 2)2 = 4.5; p = 0.11), income (chi(df = 14)2 = 19.6; p = 0.14) and personal history of CRC (chi(df = 2)2 = 4.3; p = 0.12) were potential determinants of screening intention. Other socio-demographic factors, including country of birth, private health insurance status, Socio-economic Index for Areas, and Rural and Remote Areas Classification codes, were not associated with screening intention.

CONCLUSIONS AND IMPLICATIONS

The results indicate that a variety of socio-demographic factors are associated with screening intention and need to be considered in the future development of a population-based screening program for CRC.

Early detection for colorectal cancer: new aspects in fecal occult blood screening

The authors report on promising diagnostic methods of occult intestinal bleeding and discusses the potential new strategy of early detection of colorectal carcinomas in respect to old and new diagnostic measures available. Because of the limited sensitivity and specificity of classical methods used for the demonstration of occult fecal blood, the authors recommend the introduction of new techniques and markers in screening practice. It is presumed that new discoveries in molecular biology will improve the accuracy of early colorectal cancer prevention. Their implementation into routine screening, however, will not take place in the near future. Until their realization, improved screening efficacy is expected from the use of more specific and sensitive blood tests.