Journal of Genital System & DisordersISSN: 2325-9728

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Short Communication, J Genit Syst Disor Vol: 4 Issue: 4

Global Health: Role of HPV Testing in Resource Poor Environment

Goodman A1*, Joseph N1, Bradford LS2, Dey BR3
1Department of Obstetrics and Gynecology, Massachusetts General Hospital Boston, MA, USA
2Department of Obstetrics and Gynecology, University of Massachusetts,Worcester, MA, USA
3Department of Medicine, Division of Hematology Oncology, Massachusetts General Hospital, USA
Corresponding author : Goodman A
MD, MS, Department of Obstetrics and Gynecology, Massachusetts General Hospital Boston, MA, USA
Tel: 617-724-4800
E-mail: [email protected]
Received: November 09, 2015 Accepted: December 09, 2015 Published: December 15, 2015
Citation: Goodman A, Joseph N, Bradford LS, Dey BR (2015) Global Health: Role of HPV Testing in Resource Poor Environment. J Genit Syst Disor 4:4. doi:10.4172/2325-9728.1000143

Abstract

Global Health: Role of HPV Testing in Resource Poor Environment

Eighty-five percent of cervical cancer deaths occur in the developing world. While cervical cancer is only the tenth most common cancer in women in developed countries, it is the leading cause of cancer related deaths in women in low and middleincome countries (LMICs). Despite this, there is a disproportionate allocation of cervical-cancer related resources in countries with the highest burden. Cervical cancer is preventable and amenable to early detection and treatment. Over the past two decades, largescale data investigating low cost screening interventions have demonstrated efficacy of cervical cancer prevention in many continents.

Keywords: Human papillomavirus; HPV; Low and middle income countries; LMIC; HPV testing; Cervical cancer screening

Keywords

Human papillomavirus; HPV; Low and middle income countries; LMIC; HPV testing; Cervical cancer screening

Discussion

There have been numerous efforts directed at improving primary and secondary prevention of cervical cancer. Clinical trials have found that HPV vaccination (Gardasil, Gardasil 9, Cerverix) is at least 95% effective in preventing HPV-16 or -18 persistent infection, and at least 93% effective in preventing vaccine-type specific lesions when given to girls prior to onset of sexual activity, or to those without prior infection with these subtypes [1-3]. The data also demonstrates that the HPV vaccine is widely accepted in LMICs. Vaccine coverage ranging from 55-75% can be achieved when delivery is school-based, health center based or combined with other health interventions [4,5]. However, widespread vaccination is not feasible due to sociocultural sensibilities, government distrust, and lack of patient anatomy and cost [6]. Secondary prevention in high-income countries with the Papanicolaou (Pap) smear has led to dramatic reduction of cervical cancer [7,8]. Over 90% of women in LMICs have never had a pap smear because of a lack of infrastructure for performance and interpretation of cytology, as well as the need for skilled cytotechnologists and cytopathologists. Yet cytology can be a low cost screening tool with immediate results. Programs have been developed where slides can be processed and screened on site during a clinic [9]. The majority of screening programs, however, have abandoned cytology as an option and focused attention and resources on visual inspection methods (such as visual inspection with acetic acid (VIA)), with a “see-and-treat approach”, thus eliminating the need for pathology-based intervention.
Cervical cancer screening with VIA has been an inexpensive intervention that has been used worldwide in resource poor regions. In a meta-analysis of eleven African and Indian cohort and cluster randomized trials of VIA compared to colposcopy and biopsies, VIA had a sensitivity of 79% and a specificity of 85% for the detection of CIN2 or greater [10]. A strong advantage of this technique is that it can be taught to community workers [11]. VIA can be used either as a triage to more complex screening protocols of colposcopy and biopsy or in a see-and-treat protocol [12]. In a seven-year follow-up where 60,631 women were randomized to VIA versus health education, there was a 25% decrease in cervical cancer incidence and a 35% reduction in cancer mortality in the VIA group [13].
HPV-testing, both alone and in conjunction with VIA, is an exciting area of research and development. While prevention with HPV vaccination is an important step in decreasing cervical cancer incidence and mortality, the prevalence and distribution of HPV subtypes has a geographic and ethnic variation [14]. The International Agency for Research on Cancer (IARC) HPV prevalence survey that recruits women from 26 regions for testing of HPV subtype infections identified a high prevalence of HPV in sub-Saharan Africa, Latin America, and India [15]. These regions have the highest rates of cervical cancer worldwide [16].
The specific high-risk HPV subtype varies by continent and by ethnic group. One large retrospective analysis of 8977 paraffin specimens of invasive cervical cancer from six different continents identified HR-HPV subtypes by PCR analysis [17]. HPV-16 associated cancers ranged from 66 % to 72% in Europe and North America, while in South America and Oceania it was 59%, 60% in Asia, and 48% in Africa. The greatest proportion of HPV -18 associated cervical cancers (23%) occurred in Africa. HPV-45 was an important highrisk subtype involving 10% of cancers in Africa, and 4-7% of cancers on other continents. HPV-33 was another significant minor highrisk subtype in both North America involving 6% of cancers and South America with 4% while it involved less than 3 percent in other continents. The remaining eight HR-HPV subtypes were associated with less than four percent of cancers. In Bhutan, 70% of cervical cancers contain HPV-16, and -18 [18].
Africa has the highest regional prevalence of HPV overall with 22% of women with HPV infections [17]. In Uganda, HPV -52 and -51 are more common than HPV -16 and -18 with detection rates of 12-13 percent versus 11 percent respectively [19]. In a study of 135 smears in Sudan, HPV 16 and 58 were the predominant HR-HPV subtypes [20].
An international cost-effective analysis evaluated several strategies for cervical cancer screening in Thailand, India, Peru, Kenya, and South Africa [21]. If women are screened once in their lifetime at around age 35 years with either Visual Inspection with Acetic acid (VIA) or HPV testing, a 25 to 36 % reduction in lifetime risk can occur. Risk is reduced further with a 40 % reduction for two screenings.
Women in rural India were randomized to HPV testing with Hybrid Capture® 2 High-Risk HPV DNA Test (HC-2) or no screening, cytological analysis, or VIA. In 8 years of follow-up, there were 34 deaths from cervical cancer in the HPV screened group as opposed to 54 deaths in the cytology group, 56 deaths in the VIA group, and 64 in the no screen group. Thus the cumulative incidence of advance cervical cancer was lower in women who had one HPV test versus no intervention [22]. Of note, the technicians responsible for processing HC-2 and reading cytology smears had had only three months of training.
In general, HPV tests are too expensive for a low resource setting. However one less expensive kit, care HPV (Qiagen Inc Gaithersberg MD) costs USD $5.00. In a study of 2388 women between the ages of 30 and 54, VIA, cytology, HPV testing with HC-2 and care HPV was performed. Colposcopy with biopsy was done as needed. The sensitivities and specificities of CIN2/3 were 41.4/94.5 for VIA, 85.3/87.5 for cytology, 97.1/85.6 for HC2, and 84.3/87.7 for care HPV [23]. In another cross sectional study of 5032 women in rural India, care HPV was superior to VIA and Pap testing for the detection of high-grade preinvasive cervical lesions [24]. An innovative digital diffraction analysis using a smartphone is being currently evaluated to detect HPV DNA and may be another low cost approach to screening [25].
IARC is creating a electronic directory of global screening programs through their IARC screening group http://screening. iarc.fr/cervicalindex.php [15]. There is also a coalition of healthcare advocacy organizations reports on cervical cancer screening efforts and disseminates lectures and pamphlets on screening in developing countries [26]. As more complete data emerges about worldwide cervical cancer rates and outcomes, HPV prevalence by region, and screening programs, it will be possible to fashion interventions of low cost screening and vaccination programs that are region and ethnic group appropriate.

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