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Understanding of risk factors for the human papillomavirus (HPV) infection based on gender and race

Abstract

This study assessed if race and gender predict known sexual risk factors associated with HPV. Data (n = 301) were from a cross-sectional study conducted at a drag racing event on September 12–13, 2015 in Madison, Illinois. Both multivariable logistic and linear regression models estimated the association between race, gender, and sexual risk factors. About 63% of participants were males, and 65% identified as Blacks. Compared to females, males were more likely to have a higher number of oral sexual partners (OR = 2.10; 95% CI: 1.23, 3.57). Males were also more likely to have earlier oral sexual (b = −2.10; 95% CI: −3.60, −0.60) and vaginal sexual (b = −1.10; 95% CI: −1.69, −0.31) debuts compared to females. Blacks were more likely to have higher number of vaginal sexual partners (OR = 3.38; 95% CI: 1.81, 6.31) and earlier vaginal sex (b = −1.09; 95% CI: −1.78, −0.41) but less likely to have earlier oral sexual debuts compared with Whites (b = 2.67; 95% CI: 1.21, −4.13). Because HPV is associated with several cancers, our findings provide impetus for the development of targeted educational interventions aimed at improving the knowledge of these sexual risk factors, especially among men and across race groups.

Introduction

Sexually transmitted infections (STIs) remain a source of significant morbidity and mortality in the United States and are strongly associated with racial and gender disparities1. Notably, the human papillomavirus (HPV), with its more than 150 documented strains, is the most prevalent STI in the United States, and virtually all sexually active adults will acquire HPV infection in their lifetimes2. Although most of these strains remain asymptomatic, a few oncogenic types, particularly HPV-16 and HPV-18, are associated with an increased risk of several anogenital cancers, including cervical, vaginal, vulvar, penile, anal, as well as oropharyngeal cancers3. Each year, over 43,000 newly diagnosed cancers are thought to be associated with HPV, and nearly half of these new cancer cases are HPV-positive oropharyngeal cancer4. HPV-positive oropharyngeal cancer has emerged as a leading HPV-associated cancer in the United States4,5, and its incidence has increased by 225% in the last three decades6.

High-risk sexual behavior is the main risk factor associated with the acquisition and persistence of HPV infection and development of HPV-associated cancers7. These sexual risk behaviors include age of first vaginal sex, age of first oral sex, and number of oral and vaginal sexual partners7. Previous studies have shown that these HPV-associated sexual risk factors vary by socioeconomic status, age, race, and education level8. However, there is a dearth of information about how individuals engage in these sexual behaviors in the context of HPV, based on their race and gender9. Efforts to investigate predictors of HPV infection in populations at high risk for HPV infection are critical to addressing healthcare disparities, especially understanding the differences in sexual behavior between males and females and between individuals from different racial backgrounds. This is important nationally as STIs continue to contribute significantly to the healthcare expenditure of the United States and remain a significant cause of mortality and morbidity10. It is even more important in the St. Louis region, which has consistently reported higher STI rates than more than half of major metropolitan areas in the United States reporting to the CDC11.

The goal of this study was to assess racial and gender differences in the patterns of high-risk sexual behaviors among a predominantly Black population surveyed at an event hosted by the United Black Drag Racers Association (UBDRA). This event draws participants from communities throughout the St. Louis metropolitan area and the Midwest region. Study aims were to assess number of oral sexual partners, number of vaginal sexual partners, age of first oral sex, and age of first vaginal sex, in association with HPV infection in this population.

Results

Characteristics of the study participants are summarized in Table 1. A total of 301 individuals with a mean age of 48.9 ± 13.3 years completed the questionnaire. Of these, 63% were males, and 65% identified as Black. Approximately 45% of participants reported they have had five or more oral sexual partners and 77% reported they have had five or more vaginal sexual partners. Mean age for first oral sex was 19.6 ± 5.3 years and 16.6 ± 2.8 years for first vaginal sex. Compared with females, males had a higher number of oral (p = 0.0021) and vaginal (p = 0.0108) sexual partners, initiated both oral sex (p = 0.0181) and vaginal sex (p = 0.0002) at an earlier age, and were less educated (p = 0.0079). There was no statistically significant difference between males and females in terms of race, marital status, income, drinking and cigarette smoking status.

Table 1 Characteristics of survey participants, overall and stratified by sex, n = 301$.

Number of oral and vaginal sexual partners

Multivariable logistic regression, summarized in Table 2, revealed that gender was a significant predictor of number of oral sexual partners, but race was not. Males compared with females were more likely to have a high number of oral sexual partners (aOR = 2.10; 95% CI: 1.23, 3.57). There was no statistically significant difference between the race groups and number of oral sexual partners. Race was a significant predictor of number of vaginal sexual partners, but gender was not. Blacks were more likely to have a higher number of vaginal sexual partners (OR = 3.38; 95% CI: 1.81, 6.31) compared with Whites. There was no statistically significant difference between males and females with respect to number of vaginal sexual partners.

Table 2 Multivariable logistic regression models for number of oral and vaginal sexual partners in relation to sex and race and covariates, (n = 301).

Age at first oral and vaginal sex

In multivariable linear regression analysis, summarized in Table 3, gender and race were significant predictors of age at first oral sex. Males (b = −2.10; 95% CI: −3.60, −0.60) were more likely to have earlier oral sexual debut as compared with women. Whites were more likely to have earlier oral sexual debut as compared to Blacks (b = 2.67; 95% CI: 1.21, 4.13). In regard to age at first vaginal sex, males (b = −0.10; 95% CI: −1.69, −0.31) were more likely to have earlier vaginal sexual debut compared with females as were Blacks (b = −1.09; 95% CI: −1.78, −0.41) compared with Whites. Participants who were current cigarette smokers (b = −1.19; 95% CI: −2.02, −0.36) were more likely to have earlier vaginal sexual debut compared with never smokers.

Table 3 Multivariable linear regression models for age at first oral and vaginal sex in relation to sex and race and covariates, (n = 301)$.

Discussion

This study aimed at understanding the racial and gender differences in sexual risk-taking behaviors among individuals in a primarily Black community, and our findings indicate that there are considerable racial and gender differences in high-risk sexual behaviors that are associated with HPV infection. While male participants were more likely to initiate both vaginal and oral sexual intercourse earlier than women, Whites were more likely than Blacks in general to initiate oral sex. These racial and gender patterns shown in our study align with current trends in the incidence of HPV-associated cancers of the oropharynx and have important implications in their prevention. Recent data suggest that the rate of HPV-associated oropharyngeal cancer ranged from 3.5 to 4.8 times higher for men than for women, but significantly lower among Blacks than Whites11. The data derived from this study has importance for educating members of the community about cancer prevention through HPV vaccination.

Findings that demonstrated a significant difference in age of oral and vaginal sexual debut based on gender are consistent with previous studies that have shown that males, more than females, report earlier initiation of sexual activity12. On average, males in the United States report sexual debut at 16.8 years, females at 17.2 years12. Of note, much of the published data on sexual debut limits the definition of sexual intercourse to vaginal penetration, forgoing an important, yet commonly overlooked, practice that is oral sexual intercourse12. This study extends the scope of the literature by classifying sexual debut as age at either first vaginal or first oral intercourse. It is important to distinguish the role of gender differences in not only vaginal but also in oral sexual practices, because studies have reported that men are at a three-fold higher risk of developing HPV-associated head and neck cancers compared to females13. Oral HPV is a major etiological factor in the development of head and neck squamous cell cancers, particularly oropharyngeal cancer14, and linked to oral sexual practices2,3,14. Because males are more likely to initiate oral sex and they also have a higher burden of HPV-associated oropharyngeal cancer, it is important that males in the community be educated about their oral sex lifestyles and their higher risk of developing HPV-associated oropharyngeal cancer.

Oral sex behavior is well-established as a central driver of the increasing incidence of HPV-associated oropharyngeal cancer, which has now replaced cervical cancer as the leading HPV-associated cancer3,15. Because individuals who initiate oral and vaginal sex at an early age, and/or have a greater number of oral sexual partners have higher risks of developing oropharyngeal cancer2,3,13, our findings have important implications for the community, especially among males. While cervical cancer continues to contribute to the overall cancer burden of the United States, the incidence and mortality rates have decreased tremendously in the last five decades14. Cervical cancer is also limited to females, whereas HPV-associated oropharyngeal cancers not only affect both genders, they, in fact, disproportionately affect males16. Cervical cancer prevention and control has also benefitted strongly from the availability of an early detection tool, the Papanicolaou (Pap) test14. Its introduction in the 1940’s allowed for earlier detection of cervical precancerous lesions and has greatly contributed to the dramatic decrease in both the incidence and mortality rates related to cervical cancer14. However, similar screening mechanisms for precancerous lesions of the oropharynx, as part of a periodic health examination, have not been established, although there have been calls for such a mechanism to be established17. For this reason, greater focus on oropharyngeal cancer prevention by means of increasing awareness about risky sexual activities is warranted as the next best prevention strategy.

Currently, the position of the United States Preventive Services Task Force (USPSTF) is that there is inadequate evidence to establish mortality benefits for mass oral cancer screening for asymptomatic individuals16. This lack of clear evidence of benefits of mass oral cancer screening places greater value on HPV vaccination as an important means of preventing HPV-associated oropharyngeal cancer. All three HPV vaccines (bivalent, quadrivalent, nonavalent) presently in use are highly efficacious in providing long-term immunity against various strains of HPV, including the oncogenic types 16 and 18 which represent 90–95% of HPV-associated oropharyngeal cancers18. Previous HPV vaccine trials have demonstrated nearly 100% response by oral HPV strains to existing HPV vaccines19. However, vaccination coverage among American youth remains low. Currently, the percentage of female adolescents receiving all three doses of HPV vaccine by age 13–15 years was documented at 37.1%, whereas only 27.1% of males in the same age category completed the full three-dose series20. Although the complete dose of HPV vaccine has since been updated from three doses to two if taken before 15 years of age21, the persistently low HPV vaccine uptake render the Healthy People 2020 objective of achieving 80% uptake highly unlikely22. Not only would increasing vaccination coverage of males protect against transmission of oral HPV infection and effectively reduce the incidence of HPV-associated oropharyngeal cancers, but it would also imply a secondary protective effect for individuals who have not been vaccinated, through a phenomenon known as herd immunity23. Therefore, the results of our study identify an objective need for male-targeted HPV vaccination campaigns, as well as guided sexual health programs that are more conscious of the role that gender plays in sexual debut at a younger age.

Besides males having lower HPV vaccination uptake, other studies have shown that males have poorer knowledge of the association between HPV and oropharyngeal cancer, despite the fact that males are indeed at significantly higher risk for developing head and neck cancer than females6. Thus, while the USPSTF position on mass oral cancer screening is clear, this lack of knowledge about risk factors for head and neck cancer, such as HPV, has been cited as a rationale for providing educational opportunities for lay members of the public through oral cancer screening.

Differences in sexual practices vary by race and ethnicity and may shift over time as a reflection of societal influences on sexual behavior24. In the present study, our results found that Blacks, when compared to Whites, were more likely to have a higher number of vaginal sexual partners rather than oral sexual partners. These findings are consistent with previous studies which found that White youths tend to engage in oral sex more often than Black youths and that Black girls and boys tend to initiate oral sex at a later age than Whites, after having initiated vaginal sex at an earlier age25. There may be cultural or societal norms driving this racial pattern in initiating oral and vaginal sex shown in our study. A previous nationally representative study showed that Whites were more likely than Blacks to engage in oral sex and perceive it as nonsexual, less intimate, or serious26. Additionally, authors found that only 55% of Black males and 25% of Black females reported having oral sex as appealing, compared to 66% of White males and 55% of White females26. Because the increasing incidence of HPV-associated oropharyngeal cancer has been driven largely by White males6, this finding that Whites initiate oral sex earlier highlights the need to continue to increase knowledge about the association between oral sex, oral HPV, and HPV-associated oropharyngeal cancer.

It is well known that other high-risk behaviors impact an individuals’ risk for acquiring HPV infection, including cigarette smoking27. Results of this study parallel those of previous studies, having revealed that current smokers were more likely to engage in earlier sexual behavior28. These findings are perhaps suggestive that smoking behavior is a marker for other high-risk behaviors, including sexual activity. High-risk sexual behaviors, if established in adolescence, are likely to extend into adulthood and have serious implications for the risk of acquiring HPV infection. Given this established association between early sexual debut and substance abuse behaviors, interventions that address both risk domains are more likely to result in greater influence on positive behavior change than would focusing on either high-risk behavior.

Finally, this study adds value to the current literature through its innovative methodology. Survey of community members in a non-traditional setting proved useful for carrying out this research effectively. For some interventions, particularly those targeting high-risk populations, selection of an appropriate setting may seem less obvious. Therefore, identification of a potential setting that was both convenient and comfortable for our study participants was a strategic action employed in the planning phase of this investigation.

Additionally, application of electronic data capture for survey distribution offered logic features not otherwise available with the use of paper surveys. These design capabilities permitted customization of the survey to each participant and prevented submission of incomplete responses. Moreover, use of this questionnaire platform was less time-consuming and less costly compared with the use of a paper-based questionnaire. Prior studies have reported that use of Web-based questionnaires maintains similar, if not greater, accuracy of reported information, as well as fewer response errors and socially desirable responses compared to paper-based surveys29,30. Thus, integration of electronic data capture for this study purpose offered an attractive alternative within this population.

This study has several limitations that should be noted. First, the relatively small sample size of our study may have prevented the detection of other significant differences among the participants. However, our sample size is consistent with other community-based studies at race events31,32,33,34. Second, the data was collected from a convenience sample within a narrow population; therefore, our results are susceptible to selection bias. The possibility of recall and social desirability bias also deserves mention, as this study asked participants to recall sexual risk behaviors from their late adolescence to young adulthood – nearly three decades prior. As such, applicability of this survey to the current population that is at sexual debut will be more beneficial from an interventional and cancer prevention standpoint. Additionally, data regarding anal sex and oral sex, stratified by sexual orientation and practice (receptive vs. insertive) was not collected; however, future studies should include this information for the purpose of designing effective interventions in this population. This type of data concerning minority sexual practices, which are highly stigmatized in this population, may best be collected in a qualitative setting using focus groups or structured interviews35. Importantly, specific sexual practices (i.e., inceptive or receptive sex) may have different implications for enhancing the risk of HPV acquisition within the oral cavity.

Furthermore, most participants in our study were Black males; therefore, limiting the generalizability of our findings to the US population. However, because studies on demographic factors as predictors of risk of HPV infection are limited and predominantly focus on women, information from male participants, who are more susceptible to HPV-associated oropharyngeal cancer, is invaluable in identifying gender gaps to tailor methods to improve behavioral interventions. Though the generalizability of this study is limited by characteristics of the study sample, its conclusions prompt the need for future studies to include measures of HPV vaccination status, as well as knowledge and awareness of HPV and HPV-associated oropharyngeal cancer to better identify racial-gender gaps that may exist.

Conclusions

Our study showed that race and gender are independent predictors of HPV risk factors, and being male, and White were found to be risk factors for initiating earlier oral sex, a sexual behavior closely associated with HPV infection and HPV-associated oropharyngeal cancer. Our findings provide impetus for the development of targeted educational interventions that are sensitive to gender and racial differences in sexual risk behaviors. The need for preventive programs to improve knowledge of males about sexual risk factors and their link to cancer is paramount in the community.

Methods

The study was approved by the Saint Louis University Institutional Review Board. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This was a cross-sectional study conducted at the 2015 United Black Drag Racers Association event on September 12 and 13, 2015, in Madison, Illinois. Established in 1994, the UBDRA has gained national recognition as one of the premier Black organizations in the world of motorsports. Study participants consisted of UBDRA drag racers, vendors, and spectators from across the Midwest region who attended the drag race event. Participants responded to a 78-item questionnaire survey that was based on previously validated surveys36. The questionnaire was administered using research electronic data capture (REDCap) methods and software tools hosted at Saint Louis University35. REDCap is a secure, web-based application designed to support data capture for research studies providing (1) an intuitive interface for validated data entry, (2) audit trails for tracking data manipulation and export procedures, (3) automated export procedures for seamless data downloads to common statistical packages, and (4) procedures for importing data from external sources35. A total of 15 trained volunteer survey administrators approached all participants around the racing area, including spectators in the bleachers, vendors at concession stands, and drag racers in the pit area. Potential enrollees were informed of the anonymous nature of the survey and the objective of the study, and oral informed consent was obtained from all participants. The data collected represents a convenience sample of 301 participants, 18 years or older. In exchange for participation, subjects were offered the opportunity to be entered anonymously into a raffle drawing of 15 various prizes, valued at no more than $20 each.

Measures

Questions elicited sociodemographic factors including age, gender, race, marital status, education, income, drinking status, cigarette smoking status, as well as sexual factors including number of oral and vaginal sexual partners, age of first vaginal sex, and age at first oral sex. The independent variables assessed in this study included gender and race and were categorized as follows: race (White, Black or other [which combined low-frequency responses]), and gender (male or female).

The outcome variables assessed in this study included number of oral and vaginal sexual partners, age of first vaginal sex, and age of first oral sex. To collect this data, the following questions were asked: 1) At what age did you FIRST have vaginal sexual intercourse? (Please list age in years) 2) How many vaginal sexual partners have you had in your lifetime? 3) At what age did you FIRST have oral sexual intercourse? (Please list age in years) 4) How many oral sexual partners have you had in your lifetime? Number of sexual partners was categorized as follows: number of oral and vaginal sexual partners was classified as high vs. low with five or more representing a ‘high’ number, according to measures described by the National Health Statistics Report.

Covariates adjusted for included: age; marital status (married, single but dating, and single and not dating); education level (college graduate or higher, some college, associate degree, and high school diploma or less); income level (≥100,000, 75,000–99,999, 50,000–74,999, 25,000–49,999, <25,000); drinking status (never drinker, former drinker, current drinker); and cigarette smoking status [excluding e-cigarettes] (never smoker, former smoker, current smoker).

Statistical Analysis

Analyses were performed using statistical software (SAS, version 9.4; SAS Institute Inc, NC). Descriptive statistics (frequency and percentage) were used to analyze characteristics of the respondents. We compared sociodemographic characteristics and sexual behavioral factors by using χ2 tests for categorical variables and independent sample t tests for continuous variables. Multivariable logistic regression was used to examine the association between race and gender, and number of oral and vaginal sexual partners. Multivariable linear regression analysis assessed the association between race and gender, and age of first vaginal sex, and age of first oral sex. Analyses were 2-tailed, and statistical significance was set at p < 0.05.

Data Availability

Public access to the data is restricted; however, data may be available on request with permission from the United Black Drag Racers Association.

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Acknowledgements

Part of this work was presented at the 2016 American Public Health Association meeting in Denver, Colorado. We would like to acknowledge Deniece Webb for providing feedback and proofreading this manuscript. We would also like to acknowledge Dell Yates and Michell Nickerson of the Saint Louis University Cancer Center, and the executive and members of the United Black Drag Racers Association.

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Nosayaba Osazuwa-Peters: study concept, design, and supervision; collection, assembly, interpretation of data; manuscript drafting, revision, and approval of final version. Eric Adjei Boakye: statistical analysis, interpretation of data; manuscript drafting, revision, and approval of final version. Rebecca L. Rohde: collection, assembly, interpretation of data; manuscript drafting, revision, and approval of final version. Rajan Ganesh: collection, assembly, interpretation of data; manuscript drafting, revision, and approval of final version. Ammar S. Moiyadi: collection, assembly, interpretation of data; manuscript drafting, revision, and approval of final version. Adnan S. Hussaini: collection, assembly, interpretation of data; manuscript drafting, revision, and approval of final version. Mark A. Varvares: study concept, design, and supervision; interpretation of data; manuscript drafting, revision, and approval of final version.

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Correspondence to Nosayaba Osazuwa-Peters.

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Osazuwa-Peters, N., Adjei Boakye, E., Rohde, R.L. et al. Understanding of risk factors for the human papillomavirus (HPV) infection based on gender and race. Sci Rep 9, 297 (2019). https://doi.org/10.1038/s41598-018-36638-z

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