Human Papillomavirus Vaccine Update

Human papillomavirus in cancer: Infection, disease transmission, and progress in vaccines

Human papillomaviruses (HPVs) infect epithelial cells of human beings, and their replication cycle is associated with epithelial differentiation. More than 200 genotypes of HPVs were identified, and each of these HPVs shows distinct specificity for tissues and infection. HPV infection was involved in the development of lesions on the feet, genital warts and hands. The evidence of HPV infection revealed the role of HPVs in neck and head squamous cell carcinoma, esophageal cancer, cervical cancer, head and neck cancer, brain and lung tumours. The independent traditional risk factors, various clinical outcomes, and increased prevalence among certain populations and geographical regions have led increasing interest in HPV infection. The mode of HPVs transmission remains unclear. Moreover, in recent years, vertical transmission of HPVs was reported. This review concludes present knowledge about HPV infection, virulence strains, clinical significance of HPVs, and mode of transmission, and vaccination strategies.

Status and epidemiological characteristics of high-risk human papillomavirus infection in multiple centers in Shenyang

The different human papillomavirus (HPV) strains cause warts in various regions of the body. However, considering that the status and genotype distribution of HPV infection in women in Shenyang remain unknown, herein, we investigated the epidemiological characteristics of high-risk HPV (HR-HPV) infection in women in Shenyang, as well as the current state of HPV infection in Shenyang, to provide a theoretical basis for the prevention and treatment of cervical cancer. From December 2018 to December 2021, 6,432 urban and rural women from the Liaoning Cancer Hospital and the Sujiatun Women and Infants’ Hospital were assessed via the Thinprep cytology test (TCT) and HR-HPV detection. Of the 5,961 women enrolled, 739 were HPV positive (12.40%) and 562 were TCT positive (9.43%). Statistical analyses identified the following HPV risk factors: high school education or lower [OR = 1.426 (1.199–1.696), p < 0.001], age at first sexual encounter ≤ 19 years [OR = 1.496 (1.008–2.220), p = 0.046], and number of sexual partners > 1 [OR = 1.382 (1.081–1.768), p = 0.010], atypical squamous cells of undetermined significance (ASCUS) and above [OR = 10.788 (8.912–13.060), p < 0.001], non-condom-based contraception [OR = 1.437 (1.103–1.871), p = 0.007], nationalities other than Han [OR = 1.690 (1.187–2.406), p = 0.004], rural residence [OR = 1.210 (1.031–1.419), p = 0.020]. Compared to the HPV infection rate of women aged 56–65, that in women aged 35–45 [OR = 0.687 (0.549–0.860), p = 0.001] and 46–55 [OR = 0.740 (0.622–0.879), p = 0.001] decreased significantly. To conclude, risk factors of HPV infection among female patients include high school age and below, initial sexual encounter at age ≤ 19 years, number of sexual partners > 1, ASCUS and above, non-condom contraception, nationalities other than Han nationality and rural population. Collectively, this study provides insights for the improved prevention and treatment of cervical cancer.

Depo Medroxyprogesterone (DMPA) Promotes Papillomavirus Infections but Does Not Accelerate Disease Progression in the Anogenital Tract of a Mouse Model

Contraceptives such as Depo-medroxyprogesterone (DMPA) are used by an estimated 34 million women worldwide. DMPA has been associated with increased risk of several viral infections including Herpes simplex virus-2 (HSV-2) and Human immunodeficiency virus (HIV). In the current study, we used the mouse papillomavirus (MmuPV1) anogenital infection model to test two hypotheses: (1) contraceptives such as DMPA increase the susceptibility of the anogenital tract to viral infection and (2) long-term contraceptive administration induces more advanced disease at the anogenital tract. DMPA treatments of both athymic nude mice and heterozygous NU/J (Foxn1nu/+) but ovariectomized mice led to a significantly increased viral load at the anogenital tract, suggesting that endogenous sex hormones were involved in increased viral susceptibility by DMPA treatment. Consistent with previous reports, DMPA treatment suppressed host anti-viral activities at the lower genital tract. To test the impact of long-term contraceptive treatment on the MmuPV1-infected lower genital tract, we included two other treatments in addition to DMPA: 17β-estradiol and a non-hormone based contraceptive Cilostazol (CLZ, Pletal). Viral infections were monitored monthly up to nine months post infection by qPCR. The infected vaginal and anal tissues were harvested and further examined by histological, virological, and immunological analyses. Surprisingly, we did not detect a significantly higher grade of histology in animals in the long-term DMPA and 17β-estradiol treated groups when compared to the control groups in the athymic mice we tested. Therefore, although DMPA promotes initial papillomavirus infections in the lower genital tract, the chronic administration of DMPA does not promote cancer development in the infected tissues in our mouse model.

Promoting Healthy Sexuality for Children and Adolescents With Disabilities

This clinical report updates a 2006 report from the American Academy of Pediatrics titled "Sexuality of Children and Adolescents With Developmental Disabilities." The development of a healthy sexuality best occurs through appropriate education, absence of coercion and violence, and developmental acquisition of skills to navigate feelings, desires, relationships, and social pressures. Pediatric health care providers are important resources for anticipatory guidance and education for all children and youth as they understand their changing bodies, feelings, and behaviors. Yet, youth with disabilities and their families report inadequate education and guidance from pediatricians regarding sexual health development. In the decade since the original clinical report was published, there have been many advancements in the understanding and care of children and youth with disabilities, in part because of an increased prevalence and breadth of autism spectrum disorder as well as an increased longevity of individuals with medically complex and severely disabling conditions. During this same time frame, sexual education in US public schools has diminished, and there is emerging evidence that the attitudes and beliefs of all youth (with and without disability) about sex and sexuality are being formed through media rather than formal education or parent and/or health care provider sources. This report aims to provide the pediatric health care provider with resources and tools for clinical practice to address the sexual development of children and youth with disabilities. The report emphasizes strategies to promote competence in achieving a healthy sexuality regardless of physical, cognitive, or socioemotional limitations.

Exploring attitudes of adolescents and caregivers towards community-based delivery of the HPV vaccine: a qualitative study

BACKGROUND

Human Papillomavirus (HPV) vaccination among adolescents is an important strategy to prevent cervical and other cancers in adulthood. However, uptake remains far below the Healthy People 2020 targets for the US. Given the barriers to population-level vaccination policies and challenges to incorporating additional action items during clinical visits, we sought to explore alternative delivery mechanisms, specifically delivery of the vaccine in community settings.

METHODS

We conducted six focus groups (three with adolescents aged 11-14 who had not received the HPV vaccine and three with caregivers of adolescents meeting those criteria) from Black, Latino, and Brazilian communities in Massachusetts. We utilized a framework analysis approach that involved a multi-stage coding process employing both prefigured and emergent codes. Initial interpretations were refined through consultation with an advisory board.

RESULTS

Adolescents and caregivers expressed a range of concerns about the HPV vaccine and also described interest in learning more about the vaccine, emphasizing the importance of a relationship with a trusted provider as a facilitator of vaccine acceptance. Regarding community-based delivery of the vaccine, reactions were mainly negative. However, adolescents and caregivers noted that receiving information in community settings that could seed a conversation with a trusted provider would be welcome. Interestingly, the notion of a trusted provider seemed to extend broadly to practitioners linked to the trusted main provider.

CONCLUSIONS

The study highlights an opportunity for increasing HPV vaccination among some racial and ethnic minority populations by leveraging trusted community organizations to provide information and seed conversations with a potentially broad group of trusted providers. A task-shifting approach, or reliance on staff with fewer formal credentials, may offer opportunities to support vaccination in resource-constrained settings.

Sexual health and education guidelines for the care of people with spina bifida

Sexual development is not only comprised of the changes to a person's body during puberty; it is a part of social development and should be considered in the context of basic and routine human desires for connectedness and intimacy, beliefs, values and aspirations. As is true for everyone, it is important that individuals with spina bifida have opportunities to acquire developmentally appropriate, relevant and accurate sexual health knowledge. Those with spina bifida need to be able to negotiate sexual desire, intimacy and sexual expression. They also need education about their sexual health and how to limit the negative outcomes of sexual activity related to sexually transmitted infections, unplanned pregnancy or sexual coercion, violence, abuse or exploitation. This article discusses the Spina Bifida Sexual Health and Education Healthcare Guidelines from the 2018 Spina Bifida Association's Fourth Edition of the Guidelines for the Care of People with Spina Bifida using the World Health Organization's framing of sexual health and reviews the literature on sexual health and education for individuals with spina bifida.

Human Papillomavirus Vaccine Uptake, Knowledge, and Acceptance for Youth: A Systematic Review of Appalachia

Though vaccine uptake and public support have risen since the release of the first HPV vaccines, the United States has far lower initiation and completion rates for the HPV vaccine series in comparison to other vaccines indicated for youth. Disparities are even greater in the Appalachian regions. Understanding factors contributing to these discrepancies is vital to improving vaccine rates in Appalachia. A comprehensive literature search identified all articles pertaining to HPV vaccination in children and adolescents living in Appalachia. The final 15 articles were included in a systematic review of the topic.

Evaluation of inter-observer concordance of the Swede score for digital colposcopic images

Objective

To assess inter-observer concordance by training level when applying the Swede score to digital colposcopy images.

Materials and methods

Concordance study assembled in a cross-sectional study. The population consisted of patients referred for colposcopy to a cervical pathology reference center in Bogotá, Colombia, due to abnormal cytology. Convenience sampling was used. Measured variables were age, level of education, marital status, risk factors for cervical cancer such as parity, age of sexual activity initiation and number of sexual contacts, contraceptive method, cytology report and colposcopy result according to the criteria of the Swede score. Concordance was calculated using the weighted kappa (k) index.

Results

The analysis was based on a set of 3 digital colposcopic images of 251patients. For the total score on the scale, low agreement (k = 0.38; 95% CI: 0.26-0.44) was found between two expert gynecologists; low agreement (k = 0.27; IC 95 %: 0.20-0.38) was also shown for a pair of gynecologists with different training levels, while moderate agreement (k = 0.45; 95% CI: 0.34-0.53) was found for the third pair. For individual criteria on the Swede scale, the best agreement was found for "acetowhite reaction" and "lesion size" (k = 0.43; 95% CI: 0.33-0.53).

Conclusions

Inter-observer concordance using the Swede score for digital colposcopic images ranged from low to moderate according to the level of training of the gynecologists.

Using an integrated conceptual framework to investigate parents' HPV vaccine decision for their daughters and sons

Despite being an effective cancer prevention strategy, human papillomavirus (HPV) vaccination in Canada remain suboptimal. This study is the first to concurrently evaluate HPV vaccine knowledge, attitudes, and the decision-making stage of Canadian parents for their school-aged daughters and sons. Data were collected through an online survey from a nationally representative sample of Canadian parents of 9-16 year old children from August to September 2016. Measures included socio-demographics, validated scales to assess HPV vaccine knowledge and attitudes (using the Health Belief Model), and parents' HPV vaccination adoption stage using the Precaution Adoption Process Model (PAPM; six stages: unaware, unengaged, undecided, decided not, decided to, or vaccinated). 3779 parents' survey responses were analyzed (1826 parents of sons and 1953 parents of daughters). There was a significant association between child's gender and PAPM stage of decision-making, with parents of boys more likely to report being in earlier PAPM stages. In multinomial logistic regression analyses parents of daughters (compared to sons), parents of older children, and parents with a health care provider recommendation had decreased odds of being in any earlier PAPM stage as compared to the last PAPM stage (i.e. vaccinated). Parents who were in the 'decided not to vaccinate' stage had significantly greater odds of reporting perceived vaccine harms, lack of confidence, risks, and vaccine conspiracy beliefs. Future research could use these findings to investigate theoretically informed interventions to specifically target subsets of the population with particular attention towards addressing knowledge gaps, perceived barriers, and concerns of parents.

Viral Oncology: Molecular Biology and Pathogenesis

Oncoviruses are implicated in approximately 12% of all human cancers. A large number of the world's population harbors at least one of these oncoviruses, but only a small proportion of these individuals go on to develop cancer. The interplay between host and viral factors is a complex process that works together to create a microenvironment conducive to oncogenesis. In this review, the molecular biology and oncogenic pathways of established human oncoviruses will be discussed. Currently, there are seven recognized human oncoviruses, which include Epstein-Barr Virus (EBV), Human Papillomavirus (HPV), Hepatitis B and C viruses (HBV and HCV), Human T-cell lymphotropic virus-1 (HTLV-1), Human Herpesvirus-8 (HHV-8), and Merkel Cell Polyomavirus (MCPyV). Available and emerging therapies for these oncoviruses will be mentioned.