|Year : 2015 | Volume
| Issue : 4 | Page : 101-106
Prevalence of Human Papillomavirus Infection in the Female Genital Tract of Kidney Transplant Recipients: A Systematic Review
Cleine Aglacy Nunes Miranda1, Paulo Henrique Lima2, Ana Katherine Gonçalves3, Maria Da Conceição de Mesquita Cornetta4, Ana Karla Monteiro Santana de Oliveira Freitas4, Ricardo Ney Oliveira Cobucci5, Janaina Cristiana de Oliveira Crispim6
1 Graduate Program in Development and Drug Innovation, Natal, Brazil
2 Department of Obstetrics and Gynecology, UFRN, Natal, Brazil
3 Education and Research Management MEJC / Ebserh, Natal, Brazil
4 Education and Research Management MEJC / Ebserh; Department of Obstetrics and Gynecology, UnP, Natal, Brazil
5 Department of Clinical and Toxicological Analysis, School of Pharmacy, UFRN, Natal, Brazil
6 Department of Obstetrics and Gynecology, UnP; Department of Clinical and Toxicological Analysis, School of Pharmacy, UFRN, Natal, Brazil
|Date of Web Publication||28-Oct-2015|
Janaina Cristiana de Oliveira Crispim
Faculdade de Farmácia, Rua Gal, Gustavo Godeiro de Farias, S/N. Petrópoles, 590, Natal, RN
Source of Support: None, Conflict of Interest: None
Estimation of the prevalence of high-risk human papillomavirus (HR-HPV) genotypes and cervical intraepithelial neoplasia (CIN) in female renal transplant recipients (RTRs) is important for formulating strategies for the prevention and screening of cervical cancer in this susceptible group. A systematic review of cohort studies was conducted to evaluate the prevalence of HR-HPV cervical infection and CIN in female kidney graft recipients in comparison to healthy controls. This study adhered to the meta-analysis of observational studies in epidemiology guidelines. Studies had to meet the following criteria: (1) Cohort studies of female RTRs that assessed results of cervical cytology and/or HPV prevalence, (2) studies including adult and nonpregnant subjects, (3) the description of the study's methodological and statistical methods is provided, and (4) the prevalence of HPV was clearly stated. The prevalence of HPV infection and CIN reported in the assessed studies ranged, respectively, from 4% to 45% and 0% to more than 48% in female RTR groups, while in the control groups the prevalence ranged from 17.5% to 38% and 0% to 13%. There are relatively few publications dealing with the prevalence of CIN and HPV infection in the population of transplant recipients, and the current available studies show important methodological differences. Therefore, new observational studies with larger numbers of transplanted women, proper design and control of these biases are needed to see if, among this population, the prevalence of HR-HPV infection and CIN is greater.
Keywords: Cervical intraepithelial neoplasia, human papillomavirus, kidney transplantation, prevalence
|How to cite this article:|
Miranda CA, Lima PH, Gonçalves AK, de Mesquita Cornetta MD, de Oliveira Freitas AM, Cobucci RN, de Oliveira Crispim JC. Prevalence of Human Papillomavirus Infection in the Female Genital Tract of Kidney Transplant Recipients: A Systematic Review. J Integr Nephrol Androl 2015;2:101-6
|How to cite this URL:|
Miranda CA, Lima PH, Gonçalves AK, de Mesquita Cornetta MD, de Oliveira Freitas AM, Cobucci RN, de Oliveira Crispim JC. Prevalence of Human Papillomavirus Infection in the Female Genital Tract of Kidney Transplant Recipients: A Systematic Review. J Integr Nephrol Androl [serial online] 2015 [cited 2018 Dec 19];2:101-6. Available from: http://www.journal-ina.com/text.asp?2015/2/4/101/168523
| Introduction|| |
Transplant recipients necessitate lifelong immunosuppression to avoid organ rejection and increase survival. As a result of enhanced survival, development of cancer is becoming a major cause of morbidity. , Although the late consequences of renal transplant are likely to be underreported, it is known that the overall incidence rate of cancer in renal transplant recipients (RTRs) is at least three to fivefold higher when compared to the general population with similar age and gender distribution.
In RTRs, the most prevalent neoplasms are not the cancers of the colon, breast, or lung that are commonly observed in the general population. Rather, it is uncommon tumors, such as Kaposi's sarcoma, vulvar/anal carcinomas, in situ cervix carcinomas, lip and hepatocellular carcinomas which are frequently observed.  What is more, several studies have observed a large number of malignancies in kidney transplant patients. ,,,,
One of the possible mechanisms by which immunosuppressants increase the risk of developing malignant carcinoma, is related to the infection with oncogenic viruses, such as the human papillomavirus (HPV). ,, Infection with HPV may be more aggressive in transplant recipients and the evolvement to premalignant conditions may be faster as well. , It is well established that persistent infection with high-risk HPV (HR-HPV) heralds the development of cervical neoplasia. ,
Therefore, estimation of the prevalence of HPV, mainly HR-HPV genotypes, in female RTRs is important to formulate strategies of prevention and screening of cervical cancer in this susceptible group.
The objective of this study was to provide a systematic review to evaluate the prevalence of HR-HPV cervical infection and cervical intra-epithelial neoplasia (CIN) in female kidney graft recipients in comparison to healthy controls.
| Methodology|| |
This study adhered to the meta-analysis of observational studies in epidemiology guidelines. 
Studies meeting the following criteria were included:
- Cohort studies of female RTRs that assessed results of cervical cytology and/or HPV prevalence,
- Studies including adult and nonpregnant subjects,
- The description of the study's methodological and statistical methods is provided, and
- The prevalence of HPV was clearly stated.
Search and selection of literature
Eligible studies were identified by searching the following databases: PubMed, Embase, Web of Science, and Google Scholar between 1984 and 2015. The studies were identified by a literature search of the databases using the following medical subject heading terms and/or text words: "HPV," "renal transplant," "prevalence," and "cervical lesions." The reference lists of the identified publications were reviewed for additional pertinent studies. No language restrictions were imposed.
Two researchers searched for articles published prior to March 2015. After searching the databases, 5515 potentially relevant papers were identified, of which, 5481 were excluded: 5269 after reviewing the title and 212 after reviewing the abstract. One study was included after reviewing the references.
Thus, 35 papers met the search criteria, of which seven articles were excluded for repetition of reporting. In the end, 28 papers were evaluated using the Newcastle-Ottawa scale,  of which, 23 were excluded [Figure 1]. The Newcastle-Ottawa scale evaluates the quality of cohort studies; articles that score higher than five have "high methodological quality." Two researchers independently applied the scale, and a third researcher resolved any discordance.
Various study characteristics were extracted from the original studies and included in the systematic review. The data included the first authors' last name, the year of publication, the country, the study design, the number of patients enrolled, if the studied population had a control and the mean age of transplant population [Table 1].
| Results|| |
The results of the selected studies are summarized in [Table 2] and [Table 3]. We found a great methodological heterogeneity between the articles, with significant differences in demographic characteristics of the populations studied and size of cohorts. The mode of HPV detection also varied among the studies. The polymerase chain reaction (PCR) was the main form of diagnosis, but other methods, such as HPV hybrid capture and cytomorphologic evaluation, were also used. Below, we point out the relevant results of each of the eligible studies.
Alloub et al, 1989,  was the first study to compare women with renal allografts and matched controls. They recruited 49 women who underwent kidney transplantation, in the same period, 69 women were recruited as controls. The histological findings showed a significantly higher prevalence of CIN in women with renal grafts 24 (48.5%) compared to 7 (10%) among controls (P < 0.0001). There was no significant difference between the groups in the rate of detection of total HPV DNA (45% in the women with allografts compared with 38% in the controls), the detection of type 16/18 HPV infection (both HR-HPV), however, was significantly higher among women with allografts compared with the controls (27% vs. 6%, P < 0.005).
Fairley et al., 1994,  assessed the prevalence of HPV DNA in women who received a renal transplant and compared this result with women who had renal impairment or were under dialysis. Only one woman (4.5%) of the renal impaired group had evidence of HPV DNA, while 18 (20%) of those on maintenance dialysis and 15 (22%) of the transplant patients were positive (P = 0.07 and P = 0.05, for renal impaired compared to dialysis and transplant groups respectively). This study also evaluated the presence of cervical abnormalities among the three groups. No abnormalities were present in the renal impaired population, but 11 of 89 (12.4%) on maintenance dialysis and 9 of 69 (13%) transplant patients had cytological abnormalities (P = 0.08 and P = 0.07, for renal impaired compared to dialysis and transplant group, respectively).
Morrison et al., 1996,  analyzed a small population of immunosuppressed RTRs. None of the 21 women included had CIN detected at the time of their examination, however, three women had previously been diagnosed with CIN, and when these cases were taken into consideration, the rate of CIN in this cohort was similar to that reported by other investigators. A single woman, who had prior history of CIN and vulvar condyloma acuminata, had a novel HPV type detected by PCR. The remaining 20 patients tested HPV negative.
Pietrzak et al., 2012,  collected samples from 60 kidney graft recipients and 60 healthy women. HR-HPV infection was diagnosed in 11 (18.3%) patients in the transplant group and in 15 (25%) patients in the control group, indicating a comparable infection rate between the two groups (P = 0.37). On initial screening, among the HR-HPV infected women, positive smear results were detected in two kidney graft recipients and in two healthy women. Colposcopy-guided cervical biopsy revealed that all cases were CIN2 + . However, of note, even though it was not an objective of this study, after 24 months of follow-up it was established that the rate of clearance of HR-HPV infection in the uterine cervix was similar in both groups.
Aggarwal et al., 2014,  collected cervical samples from 40 female RTRs and 80 controls. There was no evidence of cervical dysplasia or neoplastic change in any Pap smear More Details. HPV was detected in 32.5% (13/40) and 17.5% (14/80) of cases and controls, respectively (P = 0.18). The HPV genotypes 16 and 31 were the most commonly observed (38.5%), followed by HPV 18 (30.7%). In controls, HPV 16 was the most common subtype (71.4%).
| Discussion|| |
There are relatively few publications dealing with the prevalence of CIN and HPV infection in the population of transplant recipients, and the current available studies demonstrate important methodological differences. Because of this, it was impossible to build a meta-analysis using the results of the selected articles. Another problem is the small number of patients enrolled for the transplant group, which may underestimate the true prevalence of HPV infection in this population.
At present, there are still no convincing and unanimous HPV screening data from RTRs. For example, the prevalence of HPV is reported to be quite high in recipients according to Fairley et al., 1994,  but other data suggest a low HPV or comparable prevalence of HPV infection for renal recipients and controls. , Alloub et al., 1989,  only found a significantly higher prevalence of HPV 16/18 among renal recipients, a result that was in disagreement with data found by Pietrzak et al., 2012.  Despite these discordances, we can make some important suppositions. The low HPV prevalence found in some articles may be related, at least in part, to conservative sexual behaviors among female RTRs. In addition, recent sexual behavior is seen as an even more important determinant of HPV status in immunosuppressed women than past sexual behavior is. , This is consistent with the hypothesis that persistence of a newly acquired HPV infection and progression of the infection to a CIN lesion is more problematic than reactivation of latent virus. It seems also that there is no clear relation between the detection of HPV or CIN and the duration of immunosuppression. ,, This result is similar to that found by Origoni et al., 2011, studying a cohort of the Italian female kidney transplant recipients. They suggested that transplanted women might have a similar pattern of HPV infection, persistence, and regression as controls. 
Pietrzak et al., 2012,  utilized in their study, a novel approach for HPV infection diagnosis. They used the detection of HPV E6 and E7 mRNAs as a form to identify patients with an elevated risk of CIN and cervical cancer, since HPV DNA testing alone cannot discriminate between transient and transforming infection. The possibility of confirming a transforming HPV infection, thereby facilitating the early identification of women at greatest risk of cervical neoplasm development, seems very promising.  There are published reports pointing out that the introduction of HPV E6/E7 mRNA testing may improve the diagnostic accuracy in HR-HPV women.  According to this study, female kidney graft recipients of a reproductive age are as exposed to HR-HPV infection as a healthy individual. However, the utility of HPV E6/E7 mRNA in HR-HPV positive females was well established in those cases where lesions develop in the cervical canal, which often go undetected by exfoliative cytology. The detection of cervical dysplasia at an early stage would allow for timely and adequate therapy among these patients. 
Studies conducted by Anderson et al., Bruni et al. and de Sanjosé et al., ,, involving more than 1 million women in the five continents, where 18.1%, 11.7%, and 10.4% of the study population was infected by HPV, show a lower prevalence of this infection in nontransplanted women. However, we cannot compare these results with those found in the studies included in this review, as there are differences in the sample population studied, in the diagnostic methods used to detect the virus and in the populations studied with regard to sexual behavior and lifestyle habits.
Finally, in few studies that could be included in this systematic review, there is little information about number of partners, smoking habit or whether there was HPV vaccination in the study groups. These factors are known to influence the increase or decrease in the prevalence of HPV infection. Therefore, new observational studies with larger numbers of transplanted women, proper design and control of these biases are needed to see if among this population, the prevalence of HR-HPV infection and CIN is greater.
| Conclusion|| |
In the general population, the detection of pre-invasive disease by population based screening programs has reduced the incidence and mortality of cervical carcinoma.  On the premise that female transplant recipients are a high-risk group for developing cervical carcinoma, both the European and American Transplant Organizations recommend at least annual cervical smear testing. ,
Given the increased risk and poor prognosis associated with cervical cancer in the transplant population, the role of commercially available HPV vaccines that reduce the incidence of HPV 16-associated and HPV 18-associated cervical dysplasia is promising. However, a strategy of HPV vaccination before kidney transplantation is not considered to be cost effective. 
To conclude, new studies have shown that female kidney transplant recipients do not seem to have a higher risk of developing HPV infection and CIN during long-term immunosuppression therapy. These results were quite unexpected and unusual in the scenario of the correlation between immunological impairment and viral infection.  Because of this, further studies are important to finally determine the actual prevalence of HPV infection, the role of immunosuppression on HR-HPV infection and cervical lesion development among RTRs.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Table 1], [Table 2], [Table 3]