| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
1 University of California, Berkeley, Berkeley, California; 2 University of California, San Francisco, San Francisco, California; and 3 Northern California Cancer Center, Fremont, California
Requests for reprints: Joan R. Bloom, School of Public Health, University of California, 409 Warren Hall, Berkeley, CA 94720-7360. Phone: 510-642-4458; Fax: 510-643-6981. E-mail: jbloom{at}berkeley.edu
| Abstract |
|---|
|
|
|---|
Methods: A sample of 208 African American men, ages 40 to 74 years, were recruited through relatives or friends whose prostate cancer diagnosis was reported to the California Cancer Registry during the years 1997 to 2001 and from churches and African American social groups. Following a screening interview to determine eligibility, 88 men with self-reported, first-degree family history of prostate cancer and 120 without such history were interviewed by telephone. Logistic regression was used to create models of perceived risk, prostate cancer worries, receipt of a digital rectal exam, and/or prostate-specific antigen (PSA) testing.
Results: Men with a self-reported family history of prostate cancer did not perceive their risk as higher than men without a family history, nor did they report more cancer worries. They were more likely to report having a recent PSA test, but not a digital rectal exam. Having a higher than average perceived risk was associated with younger age, a college education, and lower mental well-being, and reporting more prostate cancer worries and being more likely to have had a recent PSA test.
Conclusions: Although there continues to be controversy about PSA testing, these data suggest that African American men at above-average risk are inclined to be screened. (Cancer Epidemiol Biomarkers Prev 2006;15(11):216773)
| Introduction |
|---|
|
|
|---|
Thus, many African America men have two major risk factors, ethnicity and family history. Whittemore et al. (6) considered African American as well as Asian American men in their case control study of prostate cancer risk in North America. The overall odds ratio (OR) for family history, adjusted for age, region of residence, and ethnicity was 2.5, and the OR did not differ significantly by race. Although the proportion reporting only second-degree relatives with prostate cancer did not differ between cases and controls, men reporting at least one first-degree relative were at increased risk. Relative to men with no first-degree relatives with prostate cancer, the risk among those with an affected brother was slightly higher than those with an affected father or son (OR 2.9 compared with 2.0), whereas the OR for both a brother and a father or son was 6.4 (6).
A substantial proportion of men with a family history or other risk factors remain unaware of their heightened risk (7). In a study of 139 first-degree relatives of men with prostate cancer, of the 105 men who knew about their familial risk, only 62% believed that they were at higher risk than the average man (8). A survey of African American and Euro-American men interviewed during National Prostate Awareness week in 1992 found low knowledge regarding risk factors for prostate cancer. Only 41% of African American men and 56% of Euro-American men knew that heredity could increase prostate cancer risk, whereas 53% of African American men and of 33% Euro-American men were aware that race was a risk factor (9). Two recent studies of African American men reported poor knowledge of prostate cancer with the average percentage of correct screening information being 61.9% and 68.4%, respectively. In the latter study, family history was related to screening behavior (10, 11). The Behavioral Risk Factor Survey (12) in New York found that 9% of men perceived themselves to be at "high" risk and 18% perceived that they were at "no risk." Those that perceived themselves to be at no risk were older and had less education and lower income. However, in a special survey of African American men, 7% perceived that they were at high risk of developing prostate cancer and 16% believed themselves to be at no risk. Among African American men, being at high risk versus no risk did not vary demographically (12). Finally, a study of urban and rural men in Georgia reported that rural African American men had the lowest knowledge of prostate cancer risk factors, only 10% of rural and urban African American men and rural Euro-American men perceived their risks of prostate cancer to be high (13).
Men with a family history of prostate cancer report cancer worries that may increase symptoms of depression and compromise function in daily life (9). At the same time, 60% of the family members of the men wanted to know what their risk was; the desire to know was related to having a son, other children, and a father whose prostate cancer treatment had a curative intent. Although cancer worries may have motivated men to seek information regarding their risk and screening for prostate cancer, higher levels of anxiety were related to reduced screening (14). In a U.S. study, Taylor et al. (15) also found that psychological distress was greater for those reporting high perceived risk. These findings are interpreted as suggesting that moderate anxiety enhances action on the part of the individual, whereas high levels of anxiety are inhibiting. However, in another study, men with a family history of prostate cancer (half of the sample of 166 men) reported greater perceived vulnerability and were more likely to report their intention to be screened and to have been screened in the past. Perceived vulnerability mediated the relationship between family history and intention to be screened (16). In summary, recent studies indicate that heightened perception of cancer risk and moderate worries are strong predictors of screening (17-19).
The primary purpose of this study is to describe the extent to which African American men are aware of prostate cancer as a serious threat to their health, are aware of their risk of prostate cancer based on their race and family history, are knowledgeable about prostate cancer, and have used early detection methods [digital rectal exam (DRE), prostate-specific antigen (PSA) testing]. The major hypotheses tested are that men with a first-degree family history of prostate cancer perceive their risk to be higher, are more worried about getting prostate cancer, and are more likely to have recently used early detection methods than men without such history.
| Materials and Methods |
|---|
|
|
|---|
Procedures
Eligible African American men were recruited through relatives or friends whose prostate cancer diagnosis before age 75 years was reported to the California Cancer Registry during the years 1997 to 2001. Due to difficulties reaching potentially eligible subjects without a family history of prostate cancer, we also recruited men from churches and African American social groups. Following a screening interview to determine eligibility, men with asked to refer their brother, son, or a friend/acquaintance to the study.
After gaining permission to contact the brother/son or friend, a trained interviewer ascertained eligibility and conducted a 30-minute telephone interview to assess physical and mental health status, awareness of prostate cancer risk, screening behavior, and knowledge of prostate cancer. For reasons of confidentiality a brother, son, or friend referred by a prostate cancer survivor was not informed that someone with prostate cancer had referred him to the study. We developed a close-ended, structured telephone interview and trained the four interviewers to administer it in English in a consistent way. Periodically, they also met to discuss issues that came up regarding its administration. The Institutional Review Boards of the participating institutions approved the conduct of the study.
Sample
Of 899 prostate cancer cases reported to the registry, 134 did not have a phone number and 49 did not have a phone number or an address. Six cases were excluded because their physicians advised against contacting them, 21 did not fit the sampling criteria, 42 had died, 25 were too ill, 247 refused, 59 could not be reached after 20 attempts, and 8 had not been interviewed by the end of recruitment. The 308 men who were reached and screened for having eligible family members or friends (if no eligible family members) referred 199 potential participants (Fig. 1
).
|
Of 222 referrals from African American community groups (including churches), 112 completed the survey (18 brothers/sons of men with prostate cancer and 94 without a family history of prostate cancer). Of the remaining, 7 were ineligible, 3 did not have a phone number, 8 refused, 14 could not be reached after 20 phone calls, and 78 were not interviewed as recruitment was complete. The final sample included 208 men, ages 40 to 74 years, 88 men with a self-reported first-degree family history of prostate cancer, and 120 without such a history. This sample size provides 80% power to detect at the 0.05 level (two sided) a difference of 20 percentage points between men with and without a family history of prostate cancer in the proportion with higher than average perceived risk.
Measures
The interview consisted of the following measures used in other surveys of men with prostate cancer:
Analysis Plan
Descriptive statistics were computed for study variables, including means and SDs for continuous variables and frequencies for categorical variables. Because the comparison of interest for cancer worries was between highly worried men and others, the scale was dichotomized at the highest quartile in the analysis. For perceived risk, the comparison of interest was between men with higher than average perceived risk and others. Perceived risk and prostate cancer worries were treated as binary in the analyses.
Logistic regression was used to create models of perceived risk (higher than average versus other), prostate cancer worries (
5 versus <5), corresponding to the highest quartile versus the lower three quartiles, receipt of DRE (recent versus not recent or never), and receipt of PSA (recent versus not recent or never). To ascertain the relationships among self-reported first-degree family history, perceived risk, worries, and screening following the posited order of influence, perceived risk was modeled as a function of family history (yes versus no); worries as a function of family history and perceived risk; and DRE and PSA as functions of family history, perceived risk, worries, and relevant barriers. All models controlled for sociodemographics, health-related factors, and knowledge. Sociodemographic factors in the models included age (continuous), marital status (married/partner versus single), education (college graduate versus less), employment (yes versus no), insurance (private versus public/none), recruitment source (survivor versus organization), and social network index (continuous). Health-related factors included check-up in past year (yes versus no), physical well-being (continuous), mental well-being (continuous), number of chronic conditions (continuous), and number of urinary tract symptoms (continuous). Knowledge was treated as a continuous variable. Barriers to both DRE and PSA included cost of doctor visit (yes versus no), time off work for appointment (yes versus no), and concern about side effects of prostate cancer treatment (yes versus no). The DRE-specific barrier was discomfort of the DRE (yes versus no); and PSA-specific barriers were worry about PSA results (yes versus no), cost of PSA test (yes versus no), and finding a blood test upsetting (yes versus no). A score of 3 to 5 was considered to indicate the presence of a barrier.
| Results |
|---|
|
|
|---|
60% correct (5.32 of 9). The most common potential barriers to cancer screening were the discomfort of a DRE and concerns about the side effects of cancer treatment, followed by worry about PSA results and taking time off work to keep a doctor's appointment. Over half the men had a DRE in the past year and approximately half had a PSA in the past year.
|
|
| Discussion |
|---|
|
|
|---|
The major hypotheses tested were that men with a first-degree family history of prostate cancer perceive their risk to be higher, are more worried about getting prostate cancer, and are more likely to have recently used early detection methods than men without such history.
The results do not support the hypothesis that family history is associated with increased perceived risk. Rather, younger, better-educated men and men with poorer mental health perceived themselves to be at increased risk. Our findings are consistent with the findings from the 1992 National Prostate Awareness week findings that 41% of African American men interviewed knew that heredity could increase their risk, whereas 53% were aware that race was a risk factor (9), and the Behavioral Risk Factor Survey findings in New York (12) that older men and those with less education were more likely to perceive that they were at no risk. They also suggest that awareness of risk factors for prostate cancer may not have increased among older and less educated men. The relationship between mental health and perceived risk has been found in other studies as well (37).
The results do not support the hypothesis that family history is associated with greater worries about getting prostate cancer. Perceiving oneself at risk was significantly associated with prostate cancer worries. It is not unexpected that individuals who were at higher perceived risk reported greater cancer worries. Although this finding is consistent with the literature, it has not been documented with regard to African American men (14). Although having a first-degree relative increases one's risk of the disease by an OR of 2.5 (6), the perception of being at higher than average risk (OR, 3.7) was more strongly associated with concerns about getting prostate cancer than was family history (OR, 2.3). These findings suggest that although awareness of the importance of heredity on risk is not salient in this group of men, perceived risk is, and this is the factor driving cancer worries.
The results support the hypothesis that family history is associated with the use of the early-detection method that is specific to prostate cancer, PSA testing. This is consistent with the literature which has found that screening intentions of men informed about the benefits of screening as well as the efficacy of PSA screening have been associated with family history, younger age, as well as uniformed older men (17-19).
However, there was no relationship between family history and having had a digital rectal exam. We did find that the discomfort of the DRE exam was reported as a barrier. If the man finds the DRE procedure uncomfortable, he may be less likely to agree to the exam when his symptoms previously have been related to a chronic condition, such as benign prostate hypertrophy. A negative attitude to the DRE does not seem to deter some men from prostate cancer screening. A study of 13,500 healthy men undergoing PSA-only screening found that 78% would participate in a screening that included both DRE and PSA. African American men (34% of the sample) were the most willing to participate in a PSA plus DRE screening (84%; ref. 38) and, in another study, 77% reported that they would follow-up abnormal results (39). In our current study, being older was associated with having had a recent DRE or a recent PSA test. Men who had seen a physician for a health check-up were also more likely to have had a recent DRE or PSA test.
Education also was associated with prostate cancer knowledge (not shown). The relationship between age and education and knowledge of risk factors such as being African American is not surprising, suggesting that younger, better-educated men are more widely read and, therefore, more aware of their risk. It is not surprising that knowledge by itself did not have a direct effect on risk perception because intervention to increase knowledge often result in a reduction of one's intention to be screened (39). This may be an age or period effect as prostate cancer was not widely publicized 10 years ago.
However, the number of nonspecific urinary tract symptoms was negatively associated with screening, because chronic symptoms with negative test results were not perceived as requiring further exams. The cost of a doctor's visit was a deterrent for having a PSA in the past year, whereas worry about the results was not. Cost has been considered an access barrier to screening for cancer and other chronic illnesses (40). These data provide additional support for cost as a barrier to access. Contrary to the literature, neither prostate cancer knowledge nor prostate cancer worries were related to screening behavior (9, 14). However, worry about the test results was positively associated with having a recent PSA test, very likely because a portion of men who had been recently tested were being monitored because of elevated PSA levels.
Men's knowledge of their family history was sometimes imperfect. For example, two brothers who had prostate cancer each referred the other to the study as a cancer-free individual. Eleven men known to have a family history of prostate cancer were unaware of the fact and, in this analysis were classified as having no family history of the disease. As described earlier, to protect the confidentiality of the index cases, participants were not given the names of the persons who had referred them.
There are some limitations to the study as well. Participants were highly educated with 37.5% having a college education. This compares favorably to African American men living in California. Based on the 2003 California Health Interview Survey, 30.8% of African American men ages 40 to 74 years are college graduates (41). There are some differences in education by recruitment source. Among case referrals, 32% had a high school diploma or less and 31% were college graduates; among organizational referrals, 16% had a high school diploma or less and 43% were college graduates. Thus, the registry referrals were similar in educational attainment to the general population of African American men in California. But those recruited through community organizations had substantially higher levels of education. Thus, this limits the ability to generalize the study results to all African American men ages 40 to 74 years.
A second possible limitation is also based on the method of recruitment. Most of the men with a first-degree family history of prostate cancer were recruited through a father or brother whose cancer was reported to the registry, whereas most of the men without a family history of the disease were recruited through church groups and other organizations. Given the difference in recruitment sources, it is not surprising that men without a family history had significantly larger social networks than did the relatives of cancer survivors (P = 0.0002). Thus, men without a family history may have had more access to information about PSA testing through their network of friends and relatives (23). However, the analysis controlled for social network size and found that family history increased the odds of having a PSA test in the past year 3-fold.
The importance of this study lies in its finding that family history and perceived risk were both independently associated with having a recent PSA test in African Americans. In contrast to others (16), perceived risk does not mediate the relationship between family history and screening. It is possible that physicians were more likely to refer men with a family history of prostate cancer for PSA testing, whereas men with higher perceived risk initiated screening themselves. Because a medical visit provides the opportunity for the physician to recommend or the patient to request a PSA test, the path to screening is through one's physician.
| Conclusions |
|---|
|
|
|---|
| Acknowledgments |
|---|
| Footnotes |
|---|
The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.
Received 9/26/05; revised 8/21/06; accepted 8/29/06.
| References |
|---|
|
|
|---|
This article has been cited by other articles:
![]() |
L. P. Wallner, A. V. Sarma, M. M. Lieber, J. L. St. Sauver, D. J. Jacobson, M. E. McGree, M. E. Gowan, and S. J. Jacobsen Psychosocial Factors Associated with an Increased Frequency of Prostate Cancer Screening in Men Ages 40 to 79 Years: The Olmsted County Study Cancer Epidemiol. Biomarkers Prev., December 1, 2008; 17(12): 3588 - 3592. [Abstract] [Full Text] [PDF] |
||||
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| Cancer Research | Clinical Cancer Research |
| Cancer Epidemiology Biomarkers & Prevention | Molecular Cancer Therapeutics |
| Molecular Cancer Research | Cancer Prevention Research |
| Cancer Prevention Journals Portal | Cancer Reviews Online |
| Annual Meeting Education Book | Meeting Abstracts Online |