A New Strategy for Elimination of Human Paplloma Virus-related Disease after Human Papillomavirus Vaccines Introduction

Yoo-Jin Park; Tae-Hee Kim; Hae-Hyeog Lee; Jun-Mo Kim

doi:10.14777/uti.2020.15.3.63

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Review A New Strategy for Elimination of Human Paplloma Virus-related Disease after Human Papillomavirus Vaccines Introduction: Yoo-Jin Park, Tae-Hee Kim¹, Hae-Hyeog Lee¹, Jun-Mo Kim^2,; Urogenital Tract Infection 2020;15(3):63-70.
DOI: https://doi.org/10.14777/uti.2020.15.3.63
Published online: December 31, 2020

Department of Interdisciplinary Programme in Biomedical Science, Soonchunhyang University Graduate School, Asan, Korea

¹Department of Obstetrics and Gynecology, Soonchunhyang University Buchoen Hospital, Soonchunhyang University College of Medicine, Bucheon, Korea

²Department of Urology, Soonchunhyang University Buchoen Hospital, Soonchunhyang University College of Medicine, Bucheon, Korea

Correspondence to: Jun-Mo Kim,

, Department of Urology, Soonchunhyang University Bucheon Hospital, 170 Jomaru-ro, Wonmi-gu, Bucheon 14584, Korea, Tel: +82-32-621-5464, Fax: +82-32-621-5016, E-mail: urojun@schmc.ac.kr

• Received: December 2, 2020 • Accepted: December 17, 2020

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Abstract
INTRODUCTION
MAIN BODY
CONCLUSIONS
NOTES
REFERENCES

Abstract

Human papillomavirus (HPV) infections are the most common sexually transmitted diseases in male and female. The most common HPV types include HPV 6/11/16/18/31/33/45/52/58. Bivalent (bHPV), quadrivalent (qHPV), and nonavalent (nHPV) vaccines, have been developed worldwide to protect against HPV infections. This paper describes the worldwide trends in HPV infections after HPV vaccination and shows the progressive changes in national HPV vaccination programs toward gender-neutral vaccination (GNV). This review article is based on original and review articles on the HPV-associated disease burden and nationwide vaccination trends. In Korea, epidemiology studies have shown a decline in the incidence of cervical cancer from 16.3% (in 1999) to 9.1% (in 2015). Interestingly, based on the 2019 annual report from Korean Center for Disease Control, the incidence of anogenital warts increased in both sexes during 2014-2018 and was 2.6 times higher in male than female in 2018. These results indicate the good efficacy of HPV vaccinations against both diseases in female. Other studies suggest that GNV would almost eliminate the risks of HPV-associated diseases in most countries, compared to female-only vaccination. HPV vaccine coverage remains lower in male in Korea despite the vaccine efficacy in both sexes and the worldwide GNV trend. Scaling up HPV vaccination in both sexes should be encouraged. Furthermore, removing the HPV-attributable burden through nHPV vaccination could be considered, showing that HPV 31, 33, 45, 52, 58, which are not covered by bHPV and qHPV, are as prevalent as HPV 6, 11, 16, 18.
Keywords: Papillomavirus infections; Condy-lomata acuminata; Papillomavirus vaccines; Sexually transmitted disease, viral

INTRODUCTION

Human papillomavirus (HPV) infections are the most common sexually transmitted infections in female and male. HPV infections are typically transient without symptoms and are cleared within 1-2 years [1]. On the other hand, persistence can result in anogenital warts (AGW) and premalignant or cancerous lesions in the anogenital and oropharyngeal regions [2,3]. In female, cervical cancer is the most common manifestation, where 100% of cases are caused by HPV infections. In male, cancers of the penis, anus, oral cavity, and pharynx are associated with HPV.

Three prophylactic HPV vaccines have been licensed worldwide to protect against HPV infections and associated lesions in the cervix, vulva-vagina, and anus: bivalent (bHPV), quadrivalent (qHPV), and nonavalent (nHPV), which target HPV 16/18, HPV 6/11/16/18, and HPV 6/11/16/18/31/33/45/52/58, respectively (Table 1). Most national HPV vaccination programs worldwide have been targeting females, with some countries (e.g., United States, Australia, Germany, and United Kingdom) performing gender-neutral vaccination (GNV) [4-6]. Recent studies, however, have suggested that HPV vaccination in both sexes is expected to result in even greater reductions in HPV-associated disease burdens. GNV is expected to result in the near-elimination of AGW in both sexes in Australia, with reductions of more than 90% in both sexes by 2030 [7]. Eighty percent GNV coverage could eliminate the qHPV types [6].

Although the disparity between the sexes is narrowing worldwide, HPV vaccination in Korea tends to target females. In Korea, reductions in the prevalence of AGW in female have been reported since 2012, which were attributed to the introduction of HPV vaccination [8]. Furthermore, the Korean Center for Disease Control 2019 annual report suggested that the incidence of AGW increased 2.3-3.3 times in both sexes during 2014-2018, and 2.6 times higher in male than female in 2018 (Fig. 1) [9]. Similarly, the nationwide incidence of cervical cancer in Korea has decreased from 16.3% in 1999 to 9.1% in 2015 [10]. Nevertheless, new genotypes of HPV other than qHPV types are considered important (e.g., HPV 52, 58) based on epidemiological data, and AGW has been increasing in male in Korea [8]. This review describes the trends in HPV-associated diseases and cancers worldwide and in Korea after introducing HPV vaccination. In addition, the worldwide progressive changes in national programs toward GNV and the necessity of GNV for HPV elimination are described.

MAIN BODY

1. Literature Search Strategy and Selection Criteria

A literature search of electronic databases was conducted using the following keywords: “Human Papillomavirus Infections”, and “Papillomavirus Vaccines”. These were combined with the following search terms: “Genital Warts”, “Cervical Cancer”, “Penile Cancer”, “Oropharyngeal Cancer”, and “Viral Sexually Transmitted Disease” for HPV infections; and “Gardasil” and “Cervarix” for HPV vaccinations.

Original and review articles written in English or Korean were included. Abstract-only studies, case reports, letters to the editors, commentaries, laboratory science studies, and any other non-relevant studies were excluded. The abstracts of all identified studies were reviewed to exclude irrelevant articles. Full-text reviews were performed to determine if the inclusion criteria had been satisfied. The reference lists of relevant articles from the first literature search were also reviewed for additional articles.

2. The Trend of HPV Infections in Korea

1) Prevalence of HPV infections in Korea

More than 210 HPV genotypes have been officially recognized, some of which are carcinogenic. The most well-known carcinogenic HPV types are 16 and 18. The overall prevalence of HPV infections in Korea ranges from 16.7% to 40.7%, and HPV 16 is the most common carcinogen [11]. In female worldwide, the most commonly reported HPV type is HPV 16, and the next most common types vary according to the region: HPV 52/58/18 in Asia and HPV 53/52/18 in North America [12]. The majority of HPV-associated cancers in male are attributable to HPV 16 [13,14]. On the other hand, the prevalence of HPV in Korea has changed.

Nah [11] reported that among the carcinogen types in 18,815 Korean female, the most commonly detected HPV types were 52 (3.2%), 58 (2.7%), 16 (2.0%), 56 (1.9%), and 51 (1.8%). Lee et al. [15] reported the HPV type distribution among 60,775 female aged 18-79 years. Among 87.7% of HPV single-type infections and 12.3% of multiple infections, the four most common high-risk HPV genotypes were HPV 16 (26.0%), HPV 52 (25.5%), HPV 58 (12.3%), and HPV 18 (7.1%). According to a study on the HPV-type distribution in five Asian countries (South Korea, Malaysia, Vietnam, Singapore, and the Philippines) [16], the most common types among invasive cervical cancer were HPV 16 (36.8-61.3%), 18 (12.9-35.4%), 52 (5.4-10.3%), and 45 (1.5-17.2%). In cases of cervical intraepithelial neoplasia 2/3/adenocarcinoma in situ, HPV 16 (29.7-46.6%) was the most prevalent, followed by HPV 52 (17.0-66.7%) and HPV 58 (8.6-16.0%). The authors reported that HPV 53 (9.69%), followed by HPV 58 (7.90%) and 52 (7.81%), are common HPV types, and reported that in Korea, HPV 52 and 58 were prevalent HPV types, as well as HPV 16. Park et al. [17] reported that the most common high-risk HPV types included HPV 16 (6.8%), HPV 33 (4.5%), HPV 18 (2.3%), and HPV 68 (2.3%) among 150 male patients with AGW. According to a study on the prevalence of HPV in female (N=672) and male (N=381) university students in Korea [18], the most common types in female students were HPV 51, followed by HPV 53 and 56, HPV 16 and 52, and HPV 18. This pattern was similar in male students except for no HPV 56 infections. These HPV types are associated with most HPV-associated diseases.

2) Trend in HPV-associated diseases

(1) HPV associated diseases in male: HPV infections have various genitourinary manifestations ranging from AGW to penile and anal carcinoma in male [19]. The overall prevalence of AGW in Korea has increased steadily from 51.1 (in 2007) to 98.0 (in 2015) per 100,000, with an annual percent change (APC) of +8.3%. The prevalence in males has increased steadily over time with an APC of +11.6% (p<0.001) [8]. Although neonatal uncircumcision is the most significant risk factor for penile cancer, HPV infections are also believed to be associated with penile cancers [20]. In a recent epidemiological study, an increased risk of penile cancer was associated with a history of Bowen’s disease (relative risk [RR] 9.4), which is generally considered to be caused by high-risk HPV infections and AGW (RR 5.9). The risk of penile cancer in uncircumcised male (RR 3.2) or circumcised after the neonatal period (RR 3.0) has decreased [21].

The most prevalent HPV infection sites in male are reportedly the penis and scrotum [22,23]. Previous studies have reported that the prevalence of HPV infections on the external genitalia ranges from 28-45% in males aged 17-70 years [24-26]. According to a recent report, the prevalence of HPV in the external genitalia among 1,160 healthy male aged 18-70 years in Brazil, Mexico, and the United States was 65.2% in the penile glans, coronal sulcus, penile shaft, and scrotum [27]. Rubin et al. [20] evaluated the prevalence of HPV subtypes in penile intraepithelial neoplasia (PIN), which is a dysplastic premalignant lesion; 90% of PIN lesions were HPV-positive, with HPV 16 being the most common type (40.7%). A systematic review of 31 studies, including 1,466 penile carcinomas, revealed a worldwide HPV prevalence of 46.9%, with a relative contribution of HPV 16 (60.23%), HPV 18 (13.35%), and HPV 6/11 (8.13%) [28].

These results suggest a close association between HPV infections and the development of AGW and penile carcinoma. Considering the increasing epidemiological burden of HPV infections in male, HPV is also an important issue for male’s health in Korea.

(2) HPV-associated diseases in female: In female, cervical HPV infections the most common sexually transmitted infections. Cervical cancer is ranked second in terms of incidence (after breast cancer) and third for mortality (after breast and lung cancers) among female worldwide [29]. Cervical cancer is the seventh most common cancer and the third leading cause of cancer-related death among Korean female [30]. Cervical cancer is the third most common cancer site in female aged 15-34 after thyroid and breast cancer. On the other hand, the nationwide incidence of cervical cancer in Korea has decreased continuously from 16.3% in 1999 to 9.1% in 2015, with an estimated APC of -3.7% (p<0.05) [10]. Despite the decreasing incidence of cervical cancer, its risks remain high in Korea. The HPV is closely associated with the transformation of cervical epithelial cells, leading to precancerous lesions or cancer [31]. Nah et al. [11] reported that HPV 16, 52, 58, 33, and 31 were prevalent in high-grade squamous intraepithelial lesions (HSIL) in cervical specimens among Korean female. A meta-analysis also found that HPV 58, 18, 52, and 33 were prevalent in HSIL in Korean female [32]. These HPV types can cause AGW or precancerous lesions (HSIL), which may become cancerous. Thus, these HPV types are of concern. For these reasons, many countries have implemented large-scale vaccination projects that have been effective and lifesaving against cervical cancer.

3. HPV Vaccination

1) Trend of gender-neutral HPV vaccination globally

More than 65 countries have introduced HPV vaccination programs. Most of these programs targeted females. In contrast, some countries vaccinate both sexes, including the United States, Australia, Austria, and Switzerland [6]. From 2011 to 2016, the HPV vaccine coverage rates of routine vaccination at age 11-12 years has increased from 37.7% to 45.7% in females and from 7.8% to 27.4% in males in the United States [33]. The National Cancer Institute (NCI)-designated cancer centers promote practices to eliminate HPV-associated cancers (e.g., cervical, oropharyngeal, anal, and penile cancers) via GNV and cancer screening. They stated that more than 80% of males and females aged 13-15 years should be vaccinated by 2020 as part of the nation’s Healthy People 2020 goals [34].

The introduction of GNV will decrease the risks of HPV-associated diseases significantly compared to female-only vaccination in most countries. A meta-analysis [6] predicted that if both sexes are vaccinated, 80% coverage would be sufficient to eliminate the most common four types of HPV in most models. Eighty percent HPV vaccine coverage in males and females in combination with maintaining long-term vaccine efficacy could eliminate HPV 6, 11, 16, and 18, with a median relative reduction in HPV prevalence of 1.00 after 70 years in 10 high-income regions, including Australia, Canada, the United Kingdom, and the United States.

Korostil et al. [7] also indicated that GNV would lead to the near-elimination of AGW in both sexes in Australia, with relative reductions of more than 90% in both sexes by 2030. These reductions would be less than 80% and 65% in females and males, respectively, without male vaccination.

2) HPV vaccination in Korea compared to the global trend

In Korea, bHPV 16/18 and qHPV 6/11/16/18 vaccines have been available since 2008 and 2007, respectively. Although the nHPV vaccine is available in Korea, it has not been included in the national immunization program (NIP) until now. These vaccines have decreased the prevalence of HPV-associated diseases, such as AGW and cervical cancer. Two-dose HPV vaccines to girls aged 13 or 14 years have been included in the NIP from 2016. On the other hand, the rate of HPV vaccination among males is lower than females in Korea despite the narrowed sex disparity in HPV vaccinations worldwide.

Recently, a nHPV was licensed and launched worldwide, including Korea. In Korea, the nHPV was licensed in January 2016 and was available in July 2016. The nHPV is recommended in America and Europe for the prevention of AGW, precancerous lesions, and cancers of the cervix/vulvo-vagina/anus. In addition to HPV 6, 11, 16, and 18, it covers the high-risk HPV types of HPV 31, 33, 45, 52, and 58, which are not included in bHPV and qHPV vaccines. Although HPV 52 and 58 are prevalent HPV types (in addition to HPV 16) in Korea, they are not covered by the bHPV and qHPV vaccine [35].

Most countries currently only implement vaccination in females. On the other hand, an awareness of the burden of HPV attributable diseases in male has increased. Recent data suggest that it is possible to prevent HPV-associated diseases when implementing GNV. Vaccination in males provides a herd effect in females by preventing HPV spread, as well as personal benefit. These benefits are expected to be enhanced using nHPV [36].

3) Effectiveness of HPV vaccination

(1) Decrease in HPV prevalence and disease after HPV vaccination in females: Previous studies have suggested that HPV vaccination programs decrease HPV infections in both sexes worldwide. Machalek et al. [37] reported a 92% decrease in the prevalence of qHPV types in young female aged 18-24 in Australia, from 22.7% (pre-NIP era) to 1.5% (8-9 years post-NIP era). This result is consistent with the findings by Garland et al. [38], who evaluated the prevalence of qHPV vaccine-targeted genotypes of HPV 6/11/16/18 in female aged 18-25 years in Australia from 2011 to 2015 (4-8 years post-initiation of HPV NIP). Among 737 vaginal swabs for HPV DNA detection, 184 cases (25.0%) tested positive for HPV infection. A very low prevalence of qHPV genotypes was observed: 1.7% in HPV-positive participants.

Dilner et al. [39] estimated the changes in HPV prevalence among >12,000 cervical screening female before (2004-2005) and after (2012-2013) the introduction of qHPV vaccination in Denmark, Norway, and Sweden. Despite the small vaccination coverage in cervical screening aged female, the decrease in HPV positive reactions was significant in female aged 18-26 years, from 54.4% to 48.1% (p<0.001). Moreover, the decrease was significant for qHPV vaccine types of HPV 6/11/16/18, from 22.3% to 16.6% (p<0.001). A significant decrease in qHPV types was noted in all countries, with a difference of -6.1% (from 20.3% to 14.2% in Denmark, p=0.0005), -4.1% (from 26.7% to 22.6% in Norway, p=0.03), and -5.6% (from 19.0% to 13.4% in Sweden, p=0.0008). Furthermore, the nHPV type of HPV 31 also decreased from 8.1% to 6.4% (in female aged 18-26 years) and from 6.4% to 2.1% (in female aged 27-50 years), possibly due to cross-protection from qHPV vaccination [40].

According to a nationwide study [8] on the annual prevalence of AGW from 2007 to 2015 in Korea, the prevalence in females increased until 2012 and decreased thereafter, with an APC of +3.6%, highlighting the effect of HPV vaccination (particularly in females) (p<0.05). In contrast, the prevalence in males increased continuously with an APC of +11.6%, probably due to the decreased HPV vaccination rate compared to females (p<0.001). As a result, the male-to-female prevalence rate ratios of AGW increased continuously from 1.1-2.0 in all ages over the last nine years, suggested that the prevalence has increased more in males than females (p<0.001).

(2) Effectiveness of HPV vaccination in males: Although HPV infections cause diseases and cancers in males, few studies have explored the effectiveness and safety of HPV vaccination in males. According to Harder et al. [41], male vaccination is moderately effective in anogenital HPV infections (efficacy of 46.9%), grade 2 and 3 anal intraepithelial lesions (61.9% and 46.8%, respectively), and oral infections (88%). Giuliano et al. [42] reported that non-violated qHPV vaccination decreased the incidence of HPV 6/11/16/18-related HPV-associated diseases among 4,065 males in 18 countries. The efficacy of a three-dose regimen qHPV vaccine against HPV 6/11/16/18-related external urogenital lesions was shown to be 90.4% against condyloma acuminata. The efficacy against persistent infections with HPV6/11/16/18 was 85.6%.

Previous studies suggested that if current vaccination coverage is applied to the male model, it will decrease the HPV-related disease burden to both sexes equally by preventing an additional 22,122 and 25,226 cervical carcinomas and other HPV-associated carcinomas in females over the next 100 years, respectively [4]. HPV vaccination in males prevents HPV infection and the development of associated anogenital lesions. Although the worldwide trend in sex disparity in HPV vaccinations has narrowed, and the vaccine efficacy has been demonstrated in both sexes, HPV vaccine coverage remains lower among males than females in Korea. Scaling up HPV vaccination in males and females in Korea should be encouraged, considering the sex-difference trends in HPV infections.

4.National Strategy on HPV-Related Disease Prevention in Korea

In female, cervical cancer screening can prevent cervical cancer as part of the national strategy for HPV infections. The adaptation of screening programs has led to a decreased incidence of cervical cancers worldwide. Many epidemiologic studies have supported the effectiveness of cervical cancer screening on the incidence of invasive squamous cell carcinoma in regions, including the United States, Canada, and Europe [43]. In the United States, NCI-designated cancer centers aimed to screen 93% of age-eligible females for cervical cancer to provide prompt follow-up and appropriate treatment of females who screen positive for high grade cervical precancerous lesions by 2020 [34].

In Korea, the Papanicolaou (Pap) smear was introduced in 1988 in health examinations to employees and those insured by the National Health Insurance (NHI) program. The Pap smear has played an essential role in reducing cervical cancer in Korea. The rate of Pap smears has increased from 33.5% in 1998 to 45.5% in 2009 in Korea [43]. Since 2016, the National Cancer Screening Program provides free cervical cancer screening biennially to all Korean female over 20 years of age.

HPV vaccines are recommended in both sexes and are believed to be effective regardless of a previous HPV infection history. Although GNV is provided in some regions, including the United States, Australia, and the United Kingdom, the national strategy of HPV vaccination in Korea continues to target females. GNV is expected to result in greater reductions in HPV-associated disease burdens; hence, HPV vaccination in males should be considered. According to the Korean guidelines for sexually transmitted infections published by the Centers for Disease Control and Prevention, qHPV or nHPV vaccinations are recommended in males. They are available from the age of 9 years and are recommended between 11-12 years. Adolescents who miss or fail to terminate HPV vaccinations between 9-12 years are recommended to vaccinate from 13-26 years. For males aged 27 or older, qHPV or nHPV are recommended if they have the HPV infection risk factors [44].

CONCLUSIONS

HPV infections are the most common sexually transmitted infections and an important cause of cervical, anogenital, and oropharyngeal cancers. Although the prevalence of cervical cancer has been decreased markedly owing to the HPV vaccination program in females in many countries, new genotypes, such as HPV 52 and 58, are considered as important as HPV 16, and the prevalence of AGW has been increasing in male in Korea. A new HPV vaccination strategy, such as the GNV program and the introduction of the nHPV vaccine, can eliminate most HPV-related diseases.

NOTES

CONFLICT OF INTEREST

No potential conflict of interest relevant to this article was reported.

AUTHOR CONTRIBUTIONS

Y.J.P. participated in data collection and wrote the manuscript. T.H.K. participated in the study design and coordination. H.H.L. participated in the manuscript editing. J.M.K. participated in the study design and helped to draft the manuscript. All authors read and approved the final manuscript.

Fig. 1

Tendency of gender difference in anogenital warts prevalence in Korea, 2014.2018 (adapted from 2019 annual report from the Korean Center for Disease Control: Trend of occurrence of Korean domestic sexually transmitted disease declaration) [9].

Table 1

Currently available HPV vaccinations in Korea

Characteristic	Bivalent (2vHPV)	Quadrivalent (4vHPV)	Nanovalent (9vHPV)
Brand name	Cervarix	Gardasil	Gardasil 9
Manufacturer	GlaxoSmithKline	Merck and Co, Inc.	Merck and Co, Inc.
Virus-like particles	16, 18	6, 11, 16, 18	6, 11, 16, 18, 31, 33, 45, 52, 58
Injection interval
Age of 9-13		0, 6 month
Age >14		0, 2, 6 month
Age of 9-14	0, 6 month		0, 6 month
Age >15	0, 1, 6 month		0, 2, 6 month
Volume per dose	0.5 ml	0.5 ml	0.5 ml
Administration	Intramuscular	Intramuscular	Intramuscular

HPV: human papillomavirus.

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A New Strategy for Elimination of Human Paplloma Virus-related Disease after Human Papillomavirus Vaccines Introduction

Urogenit Tract Infect. 2020;15(3):63-70. Published online December 31, 2020

DOI: https://doi.org/10.14777/uti.2020.15.3.63

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Figure

A New Strategy for Elimination of Human Paplloma Virus-related Disease after Human Papillomavirus Vaccines Introduction

Fig. 1 Tendency of gender difference in anogenital warts prevalence in Korea, 2014.2018 (adapted from 2019 annual report from the Korean Center for Disease Control: Trend of occurrence of Korean domestic sexually transmitted disease declaration) [9].

Fig. 1

A New Strategy for Elimination of Human Paplloma Virus-related Disease after Human Papillomavirus Vaccines Introduction

Table 1

Currently available HPV vaccinations in Korea

Characteristic	Bivalent (2vHPV)	Quadrivalent (4vHPV)	Nanovalent (9vHPV)
Brand name	Cervarix	Gardasil	Gardasil 9
Manufacturer	GlaxoSmithKline	Merck and Co, Inc.	Merck and Co, Inc.
Virus-like particles	16, 18	6, 11, 16, 18	6, 11, 16, 18, 31, 33, 45, 52, 58
Injection interval
Age of 9-13		0, 6 month
Age >14		0, 2, 6 month
Age of 9-14	0, 6 month		0, 6 month
Age >15	0, 1, 6 month		0, 2, 6 month
Volume per dose	0.5 ml	0.5 ml	0.5 ml
Administration	Intramuscular	Intramuscular	Intramuscular

HPV: human papillomavirus.

Table 1 Currently available HPV vaccinations in Korea

HPV: human papillomavirus.