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Principles of successful cancer screening.

Screening for cancer is the application of various tests to apparently healthy individuals in order to identify who among them has occult disease, which may be either invasive disease or a precursor lesion. For any given cancer site, the potential of screening to reduce morbidity and mortality is based on well-defined criteria for the evaluation of screening effectiveness and on acceptable performance to be realized in the average community setting. Screening programs are most successful when they are organized into a system that leads to high rates of participation, high quality, and constant surveillance and evaluation. If the elements that contribute to a successful screening program are not well organized and integrated, then the fullest potential of screening will not be realized.

Community Participation↗

Randomized controlled trial of a patient decision aid for colorectal cancer screening.

PURPOSE: To conduct a pilot test of a decision aid designed to help patients choose among currently recommended colorectal cancer screening programs. METHODS: Randomized controlled trial comparing a patient decision aid based on multicriteria decision-making theory with a simple educational intervention. PATIENT POPULATION: 96 patients at average risk for colorectal cancer seen in an Internal Medicine practice in Rochester, New York. OUTCOME MEASURES: The two primary outcome measures were patient decision process and the decision outcome. Patient decision process was assessed using the decisional conflict scale. Decision outcome was defined as the proportion of colorectal cancer screening plans carried out. RESULTS: After controlling for the effects of the physicians in a factorial analysis of variance, patients who used the decision aid had lower decisional conflict regarding colorectal cancer screening decisions (F ratio 6.47, P = 0.01) due to increased knowledge, better clarity of values, and higher ratings of the quality of the decisions they made. There was no difference between the groups in decision outcomes: 52% of patients in the control group and 49% in the experimental group completed planned screening tests (P = 1.0). CONCLUSIONS: In a pilot study, a multicriteria-based patient decision aid for colorectal cancer screening improved patients' decision-making processes but had no effect on the implementation of screening plans.

Aged↗

Social ties and colorectal cancer screening among Blacks and Whites in North Carolina.

Few studies have examined the relationship between social networks and colorectal cancer screening in diverse populations. Prior research suggests that the type of social support as well as the amount or frequency of support available from one's social network may be associated with health outcomes. Therefore, the current study examined relationships between both structural (i.e., quantitative aspects of the social network, such as number of ties and frequency of contact with ties) and functional (i.e., functions provided by social network ties, such as offering emotional or instrumental support) aspects of social ties and utilization of colorectal cancer screening tests. Analyses included 697 randomly selected Blacks and Whites ages 51 to 80 years enrolled as controls in the North Carolina Colon Cancer Study. Social tie and screening information was obtained from face-to-face interviews. Forty-seven percent of participants (40% Blacks and 51% Whites) reported use of one of the options for colorectal cancer screening according to the guidelines at that time. Compared with those with the fewest social connections, those who were most socially connected were more likely to report recent use of colorectal cancer screening [odds ratio (OR), 3.2; 95% confidence interval (95% CI), 1.7-6.2]. This association was stronger among Blacks (OR, 3.8; 95% CI, 1.3-10.7) than Whites (OR, 2.9; 95% CI, 1.2-6.9; P for interaction = 0.006). There were also positive associations between being a church group (OR, 1.9; 95% CI, 1.4-2.7) and other group member (OR, 1.6; 95% CI, 1.1-2.2) and screening. Neither emotional (e.g., offering reassurance that one is cared for) nor instrumental (e.g., giving material assistance) support was associated with screening behavior. These data suggest that structural rather than functional aspects of social ties may be important in influencing colorectal cancer screening behavior.

Adult↗

Cervical cancer screening among Chinese immigrants in Seattle, Washington.

INTRODUCTION: Chinese American women have high rates of invasive cervical cancer, compared to the general population. However, little is known about the Pap testing behavior of ethnic Chinese immigrants. METHODS: We conducted a community-based survey of Chinese immigrants living in Seattle, Washington, during 1999. Two indicators of cervical cancer screening participation were examined: at least one previous Pap smear and Pap testing in the last 2 years. RESULTS: The overall estimated response rate was 64%, and the cooperation rate was 72%. Our study sample for this analysis included 647 women. Nearly one quarter (24%) of the respondents had never had a Pap test, and only 60% had been screened recently. Factors independently associated with cervical cancer screening use included marital status, housing type, and age at immigration. CONCLUSION: Our findings confirm low levels of cervical cancer screening among Chinese immigrants to North America. Culturally and linguistically appropriate Pap testing intervention programs for less acculturated Chinese women should be developed, implemented, and evaluated.

Journal Article↗

Knowledge, beliefs, attitudes, and cancer screening among inner-city African-American women.

Three hundred twenty-one inner-city African-American women were interviewed to determine their knowledge, attitudes, and beliefs regarding cancer and cancer screening, and their cancer screening histories. The women were recruited from a variety of sources in Atlanta and were interviewed in their homes by trained lay health workers. Half of the subjects had an annual household income of < $15,000. About half had received a Pap smear and clinical breast examination within the year preceding the interviews. For women > 35 years old, 35% had received a mammogram within the recommended interval. Younger women and women with higher incomes were more likely than older women and those with lower incomes to have received a Pap test and clinical breast examination within the preceding year, but income was not significantly associated with mammography histories. In general, women who were more knowledgeable about cancer and its prevention were more likely to have been appropriately screened. However, various attitudes and beliefs regarding cancer generally were not associated with screening histories. We conclude that cancer screening programs for inner-city minority women should focus on improving knowledge levels among older women rather than attempting to alter attitudes and beliefs.

Adult↗

Impact of a breast cancer screening community intervention.

BACKGROUND: Efforts to detect breast cancer in its early stages are necessary to reduce breast cancer-associated mortality. This study evaluated the impact of a multicomponent intervention implemented between 1987 and 1990 to increase a community's utilization of breast cancer screening by women over 50 years of age. METHODS: The study used a pretest/post-test two-community design, with one community assigned as the intervention community and the other as the comparison. The intervention consisted of a comprehensive physician involvement component and a community education effort. To assess the overall impact of the interventions, we measured women's participation in screening via random digit dial telephone surveys at three time points, each approximately 18 months apart. RESULTS: Over the course of the study, there were dramatic improvements in breast cancer screening participation in both communities. However, the intervention city showed more improvement in selected variables than did the comparison community in the early phases of the project between baseline and midpoint. These included increased advice by physicians to have mammograms, increased awareness that screening is necessary in the absence of symptoms, increased awareness that many women over 50 have mammograms, decreased perception of barriers to clinical breast exam, and an increase in the proportion of women having a clinical breast exam. In addition, significantly fewer women in the intervention city than in the comparison city reported never having had a mammogram at midpoint. CONCLUSIONS: The findings demonstrate limited impact of a community intervention during a period of increasing adoption of mammography screening, in part, due to this rapidly rising secular trend. Additionally, increased activities in the comparison community were documented. Therefore, as incidence of screening increases, targeted activities aimed at population subgroups are warranted, and evaluation designs need to include multiple comparison groups or broader geographic random samples.

Aged↗

Breast cancer screening among ethnically diverse low-income women in a general hospital psychiatry clinic.

Most low-income minority women do not obtain screening mammography on a regular basis. Compliance with recommended breast cancer screening guidelines may be even lower in women with psychiatric illnesses. We investigated compliance with breast cancer screening guidelines among 121 ethnically diverse low-income women recruited from a general hospital psychiatry clinic. Mammography and clinical breast examination (CBE) had been obtained in the previous year by 59% and 70% of the patients 40 years of age and older, respectively. Among patients 20 years of age and older, 42% reported monthly breast self-examination (BSE). Physician recommendation of mammography was the strongest predictor of having obtained both a mammogram and a CBE within the previous year. There was an inverse relationship between breast cancer knowledge and screening mammography. Patients who were Hispanic, more educated, more confident in performing BSE, and whose physicians recommended monthly BSE were more likely to perform BSE monthly. These results highlight the importance of physician recommendation of compliance with screening guidelines for early detection of breast cancer. Because psychiatric patients typically are treated by psychiatrists on a regular and frequent basis, psychiatrists are in a unique position not only to encourage cancer screening but also to monitor patient compliance with their recommendations.

Adult↗

Cost-effectiveness of breast cancer screening in Spain.

In the last several years, the development of an effective breast cancer screening procedure has increased the possibility of the early detection of this cancer. We investigated the cost-effectiveness of a breast cancer screening program to screen 100,000 women 50-64 years of age in Catalonia (Spain). The cost-effectiveness ratio was measured in terms of the cost per cancer detected comparing program costs to the estimated number of cancers detected. We assumed a participation rate, sensitivity, and specificity of 70%, 92%, and 94%, respectively, and that 0.36 breast cancers could be detected per 100 women screened. We estimated a total cost of $2.1 million with $1.4 million for the mammographic stage and $0.7 million for the detection of the true positive mammographic results. The cost per woman screened was $30. We estimated that 252 cases of breast cancer could be detected with the program. The cost-effectiveness ratio obtained in this study was $8,424 per cancer detected. Sensitivity analysis has shown that cost-effectiveness results are sensitive to the variations in the following variables: specificity, cancer detection rate, and screening costs. In planning preventive programs, breast cancer screening should be considered one of the priorities.

Biopsy↗

Colon cancer screening practices following genetic testing for hereditary nonpolyposis colon cancer (HNPCC) mutations.

BACKGROUND: Although increased colonoscopic surveillance is recommended for hereditary nonpolyposis colon cancer (HNPCC) mutation carriers, limited information is available on adherence to colorectal cancer screening recommendations. This study investigated colonoscopy practices following genetic testing for HNPCC mutations. METHODS: This prospective cohort study was conducted between May 22, 1996, and November 13, 1999. Participants were 98 men and women without a personal history of colon cancer or colectomy who were identified from 11 extended HNPCC families. Colonoscopy use was evaluated by telephone before genetic counseling and was reassessed 1, 6, and 12 months following test results disclosure. RESULTS: During the 12 months following genetic counseling and testing, 73% (16/22) of HNPCC mutation carriers, 16% (8/49) of noncarriers, and 22% (6/27) of decliners reported having a colonoscopy (chi(2) = 23.97, P<.001). After controlling for clinical factors and pretest screening practices, HNPCC mutation carriers were significantly more likely than test decliners to have a colonoscopy (odds ratio [OR], 12.12; 95% confidence interval [CI], 3.42-42.96; P<.001). There were no differences in colonoscopy use between noncarriers and decliners (OR, 0.60; 95% CI, 0.28-1.29; P =.19). Perceived control over developing colon cancer also had a significant effect on posttest colonoscopy use (OR, 2.19; 95% CI, 1.22-3.94; P =.01). CONCLUSIONS: Genetic testing may motivate increased colonoscopic screening among HNPCC mutation carriers. Increased efforts may be needed to assess patients' family histories of colon cancer and provide appropriate referrals for genetic counseling and testing to target colonoscopic screening to high-risk individuals.

Adult↗

'I got a letter...' a qualitative study of women's reasoning about attendance in a cervical cancer screening programme in urban Sweden.

OBJECTIVE: This explorative study aims at investigating how 'healthy' women describe and reason about participation in a cervical cancer screening programme in Sweden. The study is part of a multidisciplinary research project studying a population-based cervical cancer-screening programme from the perspective of different actors. SETTING AND METHODS: Data collection took place at three ante-natal health centres (ANHCs) in demographically diverse areas in the Stockholm region in spring 1995. Interviews were conducted and audiotaped with 66 'healthy' women at the ANHCs immediately before taking a Papanicolau test. Open questions such as 'Why have you come here today?' and 'What kind of test will you take?' were used to initiate the interview. Verbatim transcripts were analysed with a modified phenomenographical method to identify and describe qualitatively different ways of understanding cervical cancer screening. RESULTS: Four different ways of reasoning about cervical cancer screening are described, with only one similar to the biomedical rationale for screening with focus on attending for the test/results. Two types of reasoning refer to the invitation letter as a catalyst, with one emphasizing benefits in attendance and the second emphasizing hinders to attendance. A final way of reasoning focuses on the individual's own proactive role in prevention. Common themes are also identified. IMPLICATIONS: This study complements the research literature by providing a better knowledge base of the variations in reasoning among women attending screening, often seen as a homogenous group. It can contribute to better adapting the screening situation to the varied needs and expectations of the women who attend.

Adult↗

Colorectal cancer screening in older men and women: qualitative research findings and implications for intervention.

As part of the formative research for developing interventions to increase colorectal cancer screening in men and women aged 50 and older, 14 focus groups were conducted to identify (1) knowledge, attitudes, and beliefs about colorectal cancer and colorectal cancer screening, (2) barriers to screening, and (3) strategies for motivating and supporting behavior change. Participants had either private insurance or Medicare and reported different levels of experience with colorectal cancer screening. Overall, they were poorly informed about colorectal cancer and the possible benefits of screening, reporting little or no information from physicians or mass media, negative attitudes toward screening procedures, and fear of cancer. Despite references to the subject matter as embarrassing or private, both men and women, African Americans and whites, appeared to talk candidly and comfortably in the permissive context of the focus group. This study's findings suggest that public education campaigns, decision aids, and targeted interventions are urgently needed to put colorectal cancer screening on the public's "radar screen," to increase awareness of the prevention and early detection benefits of screening, and to encourage people 50 and older-and the health care providers who serve them-to make screening a high priority.

Aged↗

A breast cancer screening programme operating in a liberal health care system: the Luxembourg Mammography Programme, 1992-1997.

The national breast cancer screening programme in Luxembourg, the Mammography Programme (MP), was launched in 1992. Its primary goal was to set up an organised breast cancer screening with biennial invitation-reinvitation of women 50-64 years, 2-view mammography, technical quality assurance, double-reading procedures and close monitoring of performance. In 1994, the decision was taken by health authorities to only reimburse screening mammograms done within the MP. We evaluated the performance of 3 screening rounds that took place in 1992-1997. In 1992, 4,815 women had opportunistic screening and 4,790 attended the MP. In 1997, 861 women had opportunistic screening and 8,603 attended the MP. In 1997, the participation rate in the MP reached 50%. The referral rate in the MP was 10% for initial screening and 5% for subsequent screening. Echographic examinations accounted for 71% of referrals. Per 1,000 screened women, biopsy and cancer rates were 18.0 and 8.0 for initial screening and 10.3 and 5.8 for subsequent screening. Twenty-one percent of the breast cancers diagnosed in screened women were interval cancers. The age-adjusted proportion of tumours >20 mm was 56.1% before 1992, 45.1% for women not (yet) screened by the MP, 27.0% for interval cancers, 26.6% for initial screening and 12.0% for subsequent screenings. Tumour size distribution was similar to that observed in the Dutch Breast Cancer Screening Programme, 1990-1993, except that in the latter programme, no difference was observed between initial and subsequent screening. The Luxembourg experience shows that in a liberal health care system, a policy of organising the screening process by reimbursing only those mammograms done within the context of the organised screening programme can drastically reduce opportunistic screening. Further efforts in the Mammography Programme will aim at increasing participation and look at ways to decrease referrals to echography.

Aged↗

Performance of cancer screening in a university general internal medicine practice: comparison with the 1980 American Cancer Society Guidelines.

The authors evaluated use of seven cancer screening tests by 52 providers in a university general internal medicine practice, using 1980 American Cancer Society (ACS) recommendations as standards for comparison. Performance rates were determined by retrospective medical record reviews of a stratified random sample of 525 patients. In addition, the 48 physicians and four nurse-practitioners in the practice were interviewed to determine their opinions, knowledge and perceived use of the tests. Performance rates were low, significantly below the ACS guidelines for all tests except Pap smear. Providers used the tests significantly more often to evaluate patients with cancer risk factors or for new patients. They significantly overestimated their own performances of six tests. More than a fourth of the providers disagreed with the use of mammography, sigmoidoscopy, pelvic or rectal examinations for screening asymptomatic adults. Their knowledge about cancer screening and the ACS recommendations was highly variable, and frequently quite limited. Providers offered four major reasons for not performing the screening tests: provider forgetfulness, lack of time, inconvenience and logistical difficulties, and patient discomfort or refusal.

Academic Medical Centers↗

Receptivity of a worksite breast cancer screening education program.

A breast cancer screening education program was offered to 97 major worksites in Forsyth County, North Carolina. Worksites could design a program by choosing components that consisted of (1) brochures, (2) breast cancer education classes taught by program staff or (3) sending company nurses to be trained by program staff to then teach employees at the worksite. A total of 63 out of the original 97 companies (65%) accepted and offered a program to their employees. Worksites that chose to sponsor a program were more likely to have already sponsored breast cancer education programs at their worksites (P = 0.027) or to have a medical department (P = 0.006). The type of component selected was significantly associated with a history of sponsoring other health education programs (P < 0.001). Fourteen worksites chose the more intensive component, the training of a company nurse. More than half of the worksites that had never sponsored and had no plans to sponsor worksite breast education programs were receptive to our program (43 of 73, 59%). The majority of these sites (67%) chose the brochure. These results indicate that worksites are receptive to offering breast cancer educational programs if varying types of components can be selected.

Adult↗

Who uses decision aids? Subgroup analyses from a randomized controlled effectiveness trial of two prostate cancer screening decision support interventions.

OBJECTIVE: To examine who reported using unsolicited prostate cancer screening decision aids distributed as part of a randomized controlled trial, whether reported use varied by type of aid (video or pamphlet), and what affect reported use had on study outcomes. METHODS: A total of 1,152 men aged 50 and older from four medical facilities in the United States were randomly assigned to pamphlet, video or usual care (control). Materials were mailed 2 weeks prior to clinic appointments in general internal medicine. Outcomes were assessed by phone survey 1 week after appointments. Analyses examined the reported use of materials by study group, the association between patient characteristics and reported use, and the impact of reported use (adjusting for patient characteristics) on a 10-item knowledge index. RESULTS: Fifty-six percent of those randomized to receive the video and 50% of those randomized to receive the pamphlet reported using the materials. Reported use of the video was higher for patients who had greater than a high school education (OR 1.73), were married (OR 2.20), and reported no prior abnormal prostate cancer screening test results (OR 3.39). Reported use of the pamphlet did not vary by patient characteristics. In intent-to-treat analyses (ignoring reported use), individuals randomized to the video and pamphlet groups had significantly higher knowledge scores relative to the control group (7.44, 7.26 and 6.90 respectively). Adjusting for reported use modestly increased the estimated differences across treatment groups but did not substantially change conclusions about the relative effects of these aids on knowledge. CONCLUSIONS: Only half of men receiving unsolicited prostate cancer screening decision aids before a visit reported using the aids, and who reported using them varied by type of aid. Efforts to broadly implement decision aids may need to offer a variety of approaches, and incorporate creative strategies to enhance reaching all population subgroups.

Aged↗

Barriers to cervical cancer screening: a qualitative study with women in Serbia.

Serbia employs opportunistic approaches to cervical cancer screening, leading to inequitable health care access. To better understand the health care needs of women, we investigated their knowledge of and perceived barriers to cervical cancer screening. Data reported in the paper arise from nine focus group discussions with 62 women from diverse socio-economic backgrounds. They were recruited in two cities with contrasting social settings, Belgrade, the Serbian capital, and a regional town, Smederevo. Thematic analysis identified that the interplay of social and personal barriers influenced women's poor presentation for screening. Inadequate public health education, lack of patient-friendly health services, socio-cultural health beliefs, gender roles, and personal difficulties were the most salient barriers to screening. We suggest how within the context of opportunistic screening patient education may be employed. The introduction of compulsory cervical cancer screening, suggested by some participants, is also discussed.

Adult↗

Comparing acculturation scales and their relationship to cancer screening among older Mexican-American women.

BACKGROUND: Hispanic women in the United States are less likely to participate in breast and cervical cancer screening than women of other racial and ethnic groups. To plan appropriate interventions requires an understanding of the barriers to participation, including those of acculturation and assimilation. Few studies have examined the effects of acculturation and assimilation on the cancer-screening behavior of Mexican-American women. PURPOSE: Because of the extensive use of the Cuellar acculturation scale and the more recent use of the Hazuda scale, we explore the utility of these two measures to predict Pap smear and mammography screening. Using a population-based sample of Mexican-American women aged 40 years and older, we compare the two scales with each other and describe their relationship to sociodemographic factors and to participation in cancer screening. METHODS: The data are from baseline surveys in El Paso and Houston, Tex., conducted before the implementation of community interventions to improve Pap smear and mammography screening in low-income Mexican-American women. Study subjects were 923 randomly selected Mexican-American women aged 40 years and older living in 16 El Paso census tracts and seven Houston census tracts. Personal interviews solicited information on age, martial and employment status, household annual income and size, education, health insurance coverage, Pap smear and mammogram history, and a series of acculturation dimensions. Acculturation was measured using the abbreviated version of the Cuellar scale developed for the Hispanic Health and Nutrition Examination Survey, 1982-1984, and the Hazuda scale developed for the San Antonio Heart Study. The eight-item Cuellar acculturation scale assessed the extent to which Spanish and English were spoken, preferred, read, and written; the ethnic identification of the respondent and her parents; and generational status in the United States. The Hazuda scale assessed the following dimensions of acculturation: adult proficiency in English, adult pattern of English versus Spanish language usage, value placed on preserving Mexican cultural origin, attitude toward traditional family structure and sex-role organization, and adult interaction with members of mainstream society. RESULTS: The Cuellar scale was highly correlated with Hazuda's two language dimension. The Hazuda scale dimensions, Mexican cultural values and traditional family attitudes, correlated the least with Cuellar's scale. All the acculturation dimensions, Cuellar's and Hazuda's, were strongly associated with education and health insurance coverage. With the use of multiple logistic regression to adjust for education, health insurance, and other variables, English proficiency was a predictor of both a recent Pap smear and a recent mammogram. No other language-based acculturation dimension was associated with a recent screening with adjustment for education, health insurance, and other variables. However, in controlling for these factors, we found that a woman's attitude toward traditional family structure was related inversely to mammogram screening. That is, women who held the strongest traditional Mexican family attitudes were more likely to participate in mammography screening. CONCLUSION: This study shows the importance of separating the effects of acculturation on cancer screening from those due to social and economic conditions. Results suggest that the Hazuda scale provides a more multidimensional approach than the Cuellar scale and is a superior measure of the acculturation process. Traditional Mexican family attitudes positively influence mammogram-screening behavior, and this finding has implications for cancer control interventions in this population.

Acculturation↗

Cancer screening--benefits, harms and making an informed choice.

BACKGROUND: Screening is a two edged sword, with potential benefits and harms. Despite professional and public enthusiasm for cancer screening there are substantial harms, and increasing evidence that it is not always a good idea to detect cancer early. On the other side, the benefits of cancer screening are quite rare and have been oversold. OBJECTIVE: This article discusses the potential harms of cancer screening and evidence for the benefits. DISCUSSION: Well recognised harms include the psychological and physical harms of false positive and false negative tests. More recent research is uncovering what may turn out to be the biggest downside of cancer screening; the potential to uncover clinically irrelevant disease (pseudo-disease) and therefore harm from unnecessary treatment.

Decision Making↗