Prevalence of cervical disease at age 20 after immunisation with bivalent HPV vaccine at age 12-13 in Scotland: retrospective population study
BMJ 2019; 365 doi: https://doi.org/10.1136/bmj.l1161 (Published 03 April 2019) Cite this as: BMJ 2019;365:l1161Linked editorial
The remarkable impact of bivalent HPV vaccine in Scotland
Linked opinion
Bivalent HPV vaccine in Scotland is having a considerable and sustained effect

All rapid responses
(Word count without footnotes and citations: 934)
In April 2019, Palmer et al [1] published a retrospective population study crediting vaccination against human papilloma virus (HPV) with reduction in HPV prevalence in Scotland, and the authors attributed a reduction in HPV prevalence among unvaccinated women with “herd protection.” However the authors did not mention Scotland’s population-wide public health campaigns to address endemic vitamin D deficiency. The Scottish Government recognized the high prevalence of vitamin D deficiency in its population and began recommending vitamin D supplementation not later than 2006. Vitamin D deficiency results in impaired mucosal and immune defenses and correlates in a dose-dependent manner with increased cervicovaginal HPV infection [2]. By 2009, coincident with the start of the HPV vaccination campaign in 2008, numerous vitamin D supplementation (and sun exposure) campaigns were being implemented throughout Scotland to combat the documented population-wide problem of vitamin D deficiency.
Our views of vitamin D experienced a paradigm shift in the early part of this century with landmark publications such as Vieth’s authoritative documentation of safety in 1999 [3], Zittermann’s “Vitamin D in preventive medicine” in British Journal of Nutrition in 2003 [4], and Vasquez’s “Clinical importance of vitamin D (cholecalciferol): a paradigm shift with implications for all healthcare providers” in 2004 [5] followed by an important partial summary of vitamin D usage guidelines in British Medical Journal in 2005 [6]. These and similarly themed articles have contributed to increased awareness of vitamin D’s safety and roles in preventive medicine and public health, including reducing the burden of infectious diseases such as viral infections and various types of cancer. Consistent with this evidence of safety and benefit, along with evidence that the human daily requirement is an order of magnitude greater than previously believed [7], use of vitamin D supplementation began to increase slowly and then exponentially in the United States [8] and other countries, especially English-speaking societies, most notably the United Kingdom. Indeed, according to the Scottish Health Survey 2003 [9], use of dietary supplements such as vitamins (including vitamin D), fish oils (a source of vitamin D) and minerals (magnesium supplementation improves vitamin D status and is necessary for vitamin D activation, binding, transport, metabolism, and gene expression [10]) had already begun to increase between 1998 and 2003. Certainly not later than 2006, the Scottish Government was already recommending widespread use of vitamin D supplements to combat the high prevalence of vitamin D deficiency in Scotland [11].
Widespread vitamin D deficiency in Scotland was followed by widespread recommendations for vitamin D supplementation starting in 2006 and 2009. In 2006, Burleigh and Potter published in Scottish Medical Journal [12] stating that, “The prevalence of vitamin D deficiency is high in older outpatients in this geographical area.” In 2007, Hyppönen and Power [13] showed that among British adults “Prevalence of hypovitaminosis D in the general population was alarmingly high during the winter and spring, which warrants action at a population level rather than at a risk group level.” In 2008, Rhein [14] further specified that “Vitamin D deficiency is widespread in Scotland.” In 2009, the Scottish Government acknowledged the need to educate its population about the importance of vitamin D3 supplementation [15]. From that time until the present, the Scottish Government, United Kingdom National Health Services, and various advocacy groups and programs (e.g., ScotsNeedVitaminD.com[16], Healthy Start, which provides vitamin D supplements to all children and pregnant women in Scotland [17]) continue assertive public health campaigns recommending vitamin D supplementation and increased vitamin D production via sun exposure via the “Shine on Scotland” program initiated in 2009 [18] for all of its citizens [19-23].
Vitamin D supplementation has been the subject of many clinical trials documenting anti-inflammatory, antiviral, and anticancer benefits. Correction of vitamin D deficiency has significant anti-inflammatory [24] and immunomodulatory [25] benefits. Vitamin D and its direct metabolites promote production of antimicrobial peptides which have antibacterial and antiviral properties, while also reducing viral replication by inhibiting the NF-kappaB pathway. Consistent with these immunomodulatory and antiviral mechanisms, data from several placebo-controlled trials shows that vitamin D provides benefit in a variety of infectious conditions including human immunodeficiency virus (HIV) [26], hepatitis C virus [27-29] and upper respiratory infections [30-31]. Vitamin D administration displays impressive clinical effectiveness against dermal HPV as shown in case reports, clinical series, and placebo-controlled trials, with remarkable safety, high efficacy, and a consistent trend toward complete resolution of lesions [32-36]. In 2014, Schulte-Uebbing et al [37] published “Chronical cervical infections and dysplasia (cervical intraepithelial neoplasia [CIN] 1-2): vaginal vitamin D treatment” showing that among 200 women with cervical dysplasia, vitamin D vaginal suppositories (12,500 IU, 3 nights per week, for 6 weeks) provided “very good anti-inflammatory effects” and “good antidysplastic effects” in women with CIN 1. In 2017, Vahedpoor and colleagues [38] published a double-blind placebo-controlled trial of vitamin D in women with HPV, in which they found that vitamin D3 administration for 6 months among women with CIN1 resulted in its regression and had beneficial effects on markers of insulin metabolism and antioxidant status. In 2018, Vahedpoor and colleagues [39] published a double-blind placebo-controlled trial of vitamin D in women with HPV, in which they observed, “The recurrence rate of CIN1/2/3 was 18.5 and 48.1% in the vitamin D and placebo groups respectively”, thereby clearly favoring treatment with vitamin D over placebo.
In Scotland, programs advocating HPV vaccination (started in 2008) and vitamin D supplementation (started not later than 2006 and again in 2009) occurred in close chronologic proximity. Crediting the reduction in HPV-related disease solely to vaccination via retrospective population study is potentially invalid and misleading, especially when the authors make no account whatsoever of the national program for vitamin D supplementation which started in the same timeframe. Numerous studies have shown that vitamin D provides immunomodulatory, anti-inflammatory, microbiome-modifying, antiviral and anti-HPV benefits with high safety, good efficacy, low cost, wide availability, and clinically important collateral benefits.
[1] Palmer T, Wallace L, Pollock KG, Cuschieri K, Robertson C, Kavanagh K, Cruickshank M. Prevalence of cervical disease at age 20 after immunisation with bivalent HPV vaccine at age 12-13 in Scotland: retrospective population study. BMJ. 2019 Apr 3;365:l1161. doi: 10.1136/bmj.l1161
[2] Shim J, Pérez A, Symanski E, Nyitray AG. Association Between Serum 25-Hydroxyvitamin D Level and Human Papillomavirus Cervicovaginal Infection in Women in the United States. J Infect Dis. 2016 Jun 15;213(12):1886-92. doi: 10.1093/infdis/jiw065
[3] Vieth R. Vitamin D supplementation, 25-hydroxyvitamin D concentrations, and safety. Am J Clin Nutr. 1999 May;69(5):842-56
[4] Zittermann A. Vitamin D in preventive medicine: are we ignoring the evidence? Br J Nutr. 2003 May;89(5):552-72
[5] Vasquez A, Manso G, Cannell J. The clinical importance of vitamin D (cholecalciferol): a paradigm shift with implications for all healthcare providers. Altern Ther Health Med. 2004 Sep-Oct;10(5):28-36 https://www.ncbi.nlm.nih.gov/pubmed/15478784
[6] Vasquez A, Cannell J. Calcium and vitamin D in preventing fractures: data are not sufficient to show inefficacy. BMJ. 2005 Jul 9;331(7508):108-9 https://doi.org/10.1136/bmj.331.7508.108-b and https://www.ncbi.nlm.nih.gov/pmc/articles/PMC558659/
[7] Heaney RP, Davies KM, Chen TC, Holick MF, Barger-Lux MJ. Human serum 25-hydroxycholecalciferol response to extended oral dosing with cholecalciferol. Am J Clin Nutr. 2003 Jan;77(1):204-10
[8] Rooney MR, Harnack L, Michos ED, Ogilvie RP, Sempos CT, Lutsey PL. Trends in Use of High-Dose Vitamin D Supplements Exceeding 1000 or 4000 International Units Daily, 1999-2014. JAMA. 2017 Jun 20;317(23):2448-2450. doi: 10.1001/jama.2017.4392
[9] "The proportion of adults who report taking dietary supplements (such as vitamins, fish oils, minerals etc) has increased slightly since 1998 (there was no change between 1995 and 1998). In 1998, 15% of men and 16% of women aged 16-64 took some form of dietary supplement, which increased to 20% and 26%, respectively, in 2003." The Scottish Health Survey 2003. Chapter 3 Fruit and Vegetable Consumption and Eating Habits. https://www.webarchive.org.uk/wayback/archive/20180602183443/http://www.... Accessed April 2019
[10] Reddy P, Edwards LR. Magnesium Supplementation in Vitamin D Deficiency. Am J Ther. 2019 Jan/Feb;26(1):e124-e132. doi: 10.1097/MJT.0000000000000538
[11] "Therefore, routine vitamin D supplementation is recommended for all children over 1 year of age and should be continued until 5 years unless the diet is diverse and plentiful." Scottish Government. Nutritional Guidance for Early Years: food choices for children aged 1-5 years in early education and childcare settings. Published: 23 Jan 2006. https://www.gov.scot/publications/nutritional-guidance-early-years-food-... Accessed April 2019
[12] Burleigh E, Potter J. Vitamin D deficiency in outpatients: a Scottish perspective. Scott Med J. 2006 May;51(2):27-31
[13] Hyppönen E, Power C. Hypovitaminosis D in British adults at age 45 y: nationwide cohort study of dietary and lifestyle predictors. Am J Clin Nutr. 2007 Mar;85(3):860-8
[14] Rhein HM. Vitamin D deficiency is widespread in Scotland. BMJ. 2008 Jun 28;336(7659):1451. doi: 10.1136/bmj.39619.479155.3A
[15] Boy wins NHS backing in vitamin D campaign. The Scotsman 2009 December https://www.scotsman.com/news/boy-wins-nhs-backing-in-vitamin-d-campaign... Accessed April 2019
[16] “At scotsneedvitamind.com, we believe the people of Scotland would see health improvements by taking a regular Vitamin D supplement. We think there is enough evidence currently available to make all of us take action, from health care professionals to parents and teachers.” https://scotsneedvitamind.com/about-us/ Accessed April 2019
[17] "The United Kingdom National Health Services created a program called Healthy Start, which offers vouchers for free vitamin D supplements to qualifying pregnant women, women with a baby under one year old and children under the age of five years located in Scotland, Northern Ireland, England and Wales. In April of 2017, the Scottish government partnered with the Healthy Start program to offer free vitamin D supplements to all Scottish pregnant women, regardless of whether they qualify for vouchers. This joint effort was created to decrease the risk of rickets and other health complications caused by vitamin D deficiency. Scotland offers free vitamin D supplements for all pregnant residents. Posted on: November 28, 2017 by Missy Sturges and John Cannell, MD. https://www.vitamindcouncil.org/scotland-offers-free-vitamin-d-supplemen.... See also: National Health Services Scotland. Vitamin D. https://www2.gov.scot/resource/0038/00386784.pdf Accessed April 2019
[18] Scottish warning over vitamin D levels. 19 September 2010 https://www.bbc.com/news/uk-scotland-11355810 Accessed April 2019
[19] "Following recommendations from the Scientific Advisory Committee on Nutrition (SACN), Scottish Government advice on vitamin D for all age groups has been updated as follows: Everyone age 5 years and above should consider taking a daily supplement of 10 micrograms vitamin D, particularly during the winter months (October – March)." Scottish Government. Vitamin D. https://www2.gov.scot/Topics/Health/Healthy-Living/Food-Health/vitaminD Accessed April 2019
[20] Scottish Government. Vitamin D information for health professionals in Scotland. November 2017 https://www.gov.scot/binaries/content/documents/govscot/publications/pub... Accessed April 2019
[21] "Scots should consider taking vitamin D supplements all-year round, but particularly in autumn and winter, according to new health advice." All Scots advised to take vitamin D says new health guidance. 21 July 2016. https://www.bbc.com/news/uk-scotland-36856176 Accessed April 2019
[22] "International experts are calling for food in Scotland to be fortified with vitamin D, in an attempt to cut the large numbers of people who develop multiple sclerosis at sunshine-deprived northern latitudes." Add vitamin D to Scotland's food – experts: Dosing whole population would help cut levels of multiple sclerosis, say scientists. 23 Dec 2011 https://www.theguardian.com/uk/2011/dec/23/vitamin-d-scotland-food-multi... Accessed April 2019
[23] All Scottish babies should have vitamin D supplement, CMO says. The Pharmaceutical Journal 2017 Nov 30. https://www.pharmaceutical-journal.com/news-and-analysis/news/all-scotti... Accessed April 2019
[24] Timms PM, Mannan N, Hitman GA, Noonan K, Mills PG, Syndercombe-Court D, Aganna E, Price CP, Boucher BJ. Circulating MMP9, vitamin D and variation in the TIMP-1 response with VDR genotype: mechanisms for inflammatory damage in chronic disorders? QJM. 2002 Dec;95(12):787-96
[25] Sánchez-Armendáriz K, García-Gil A, Romero CA, Contreras-Ruiz J, Karam-Orante M, Balcazar-Antonio D, Domínguez-Cherit J. Oral vitamin D3 5000 IU/day as an adjuvant in the treatment of atopic dermatitis: a randomized control trial. Int J Dermatol. 2018 Dec;57(12):1516-1520. doi: 10.1111/ijd.14220
[26] Stallings VA, Schall JI, Hediger ML, Zemel BS, Tuluc F, Dougherty KA, Samuel JL, Rutstein RM. High-dose vitamin D3 supplementation in children and young adults with HIV: a randomized, placebo-controlled trial. Pediatr Infect Dis J. 2015 Feb;34(2):e32-40. doi: 10.1097/INF.0000000000000483
[27] Abu-Mouch S, Fireman Z, Jarchovsky J, Zeina AR, Assy N. Vitamin D supplementation improves sustained virologic response in chronic hepatitis C (genotype 1)-naïve patients. World J Gastroenterol. 2011 Dec 21;17(47):5184-90. doi: 10.3748/wjg.v17.i47.5184
[28] Nimer A, Mouch A. Vitamin D improves viral response in hepatitis C genotype 2-3 naïve patients. World J Gastroenterol. 2012 Feb 28;18(8):800-5. doi: 10.3748/wjg.v18.i8.800
[29] Komolmit P, Kimtrakool S, Suksawatamnuay S, Thanapirom K, Chattrasophon K, Thaimai P, Chirathaworn C, Poovorawan Y. Vitamin D supplementation improves serum markers associated with hepatic fibrogenesis in chronic hepatitis C patients: A randomized, double-blind, placebo-controlled study. Sci Rep. 2017 Aug 21;7(1):8905. doi: 10.1038/s41598-017-09512-7
[30] Jung HC, Seo MW, Lee S, Kim SW, Song JK.Vitamin D3 Supplementation Reduces the Symptoms of Upper Respiratory Tract Infection during Winter Training in Vitamin D-Insufficient Taekwondo Athletes: A Randomized Controlled Trial. Int J Environ Res Public Health. 2018 Sep 14;15(9). pii: E2003. doi: 10.3390/ijerph15092003
[31] Lee MT, Kattan M, Fennoy I, Arpadi SM, Miller RL, Cremers S, McMahon DJ, Nieves JW, Brittenham GM. Randomized phase 2 trial of monthly vitamin D to prevent respiratory complications in children with sickle cell disease. Blood Adv. 2018 May 8;2(9):969-978. doi: 10.1182/bloodadvances.2017013979
[32] Moscarelli L, Annunziata F, Mjeshtri A, Paudice N, Tsalouchos A, Zanazzi M, Bertoni E. Successful treatment of refractory wart with a topical activated vitamin d in a renal transplant recipient. Case Rep Transplant. 2011;2011:368623. doi: 10.1155/2011/368623. Epub 2012 Jan 3.
[33] Aktaş H, Ergin C, Demir B, Ekiz Ö. Intralesional Vitamin D Injection May Be an Effective Treatment Option for Warts. J Cutan Med Surg. 2016 Mar-Apr;20(2):118-22. doi: 10.1177/1203475415602841. Epub 2015 Aug 20
[34] Raghukumar S, Ravikumar BC, Vinay KN, Suresh MR, Aggarwal A, Yashovardhana DP. Intralesional Vitamin D3 Injection in the Treatment of Recalcitrant Warts: A Novel Proposition. J Cutan Med Surg. 2017 Jul/Aug;21(4):320-324. doi: 10.1177/1203475417704180. Epub 2017 Apr 6.
[35] Naresh M. A Study of Effectiveness of Intralesional Vitamin D3 in Treatment of Multiple Cutaneous Warts. IOSR Journal of Dental and Medical Sciences (IOSR -JDMS) 2019:18(3),84-87
[36] Abdel Kareem IM, Ibrahim IM, Fahmy Mohammed SF, Ahmed AA. Effectiveness of intralesional vitamin D3 injection in the treatment of common warts: single-blinded placebo-controlled study. Dermatol Ther. 2019 Mar 28:e12882. doi: 10.1111/dth.12882
[37] Schulte-Uebbing C, Schlett S, Craiut I, Antal L, Olah H. Chronical cervical infections and dysplasia (CIN I, CIN II): vaginal vitamin D (high dose) treatment. Dermatoendocrinol 2014 Oct; 6:e27791. doi:10.4161/derm.27791
[38] Vahedpoor Z, Jamilian M, Bahmani F, Aghadavod E, Karamali M, Kashanian M, Asemi Z. Effects of Long-Term Vitamin D Supplementation on Regression and Metabolic Status of Cervical Intraepithelial Neoplasia: a Randomized, Double-Blind, Placebo-Controlled Trial. Horm Cancer. 2017 Feb;8(1):58-67. doi: 10.1007/s12672-016-0278-x. Epub 2017 Jan 3
[39] Vahedpoor Z, Mahmoodi S, Samimi M, Gilasi HR, Bahmani F, Soltani A, Sharifi Esfahani M, Asemi Z. Long-Term Vitamin D Supplementation and the Effects on Recurrence and Metabolic Status of Cervical Intraepithelial Neoplasia Grade 2 or 3: A Randomized, Double-Blind, Placebo-Controlled Trial. Ann Nutr Metab. 2018;72(2):151-160. doi: 10.1159/000487270. Epub 2018 Feb 21
Competing interests: Dr Alex Vasquez is a lecturer and author of numerous articles, letters, and books related to topics of nutrition, clinical medicine, neuroinflammation, and the human microbiome. Dr Vasquez has served as a consultant to Biotics Research Corporation.
I am grateful to Timothy Palmer [1]. In line with Castanon and Sasieni [2] I was careful not to argue that incidence of cervical cancer had gone up in 20-24 year-olds in England [3], only that it had not apparently gone down. He notes "that it has occurred in a cohort of largely unvaccinated women", but vaccination began for 18 year-old women in 2008, so by 2014-15 they would surely be "largely" vaccinated.
Regarding problems with safety I provided a short bibliography to Julia Brotherton in an earlier letter [3] and there are some further references here [4]. The many issues represented by these publications should not be swept aside.
[1] Timothy J Palmer, 'Re: Prevalence of cervical disease at age 20 after immunisation with bivalent HPV vaccine at age 12-13 in Scotland: retrospective population study', 7 April 2019, https://www.bmj.com/content/365/bmj.l1161/rr-3
[2] Alejandra Castanon, Peter Sasieni, 'Is the recent increase in cervical cancer in women aged 20–24 years in England a cause for concern?', Preventive Medicine Volume 107, February 2018, Pages 21-28, https://www.sciencedirect.com/science/article/pii/S0091743517304802
[3] John Stone, 'Cervical Disease Vs Cervical Cancer' 6 April 2019, https://www.bmj.com/content/365/bmj.l1161/rr-2
[4] John Stone, 'Re: The remarkable impact of bivalent HPV vaccine in Scotland', 4 April 2019, https://www.bmj.com/content/365/bmj.l1375/rr
[5] John Stone 'Primum non nocere', 11 December 2018, https://www.bmj.com/content/363/bmj.k4602/rr
Competing interests: No competing interests
In his Author Perspective, following this article, Tim Palmer writes
“ In Scotland, as elsewhere, no serious adverse effects have been demonstrably linked to the vaccine. The ratio of benefit to possible harm therefore strongly supports Immunisation.”
The WHO has a website which collects global reports of adverse events (1).
When Steve Hinks drew attention to the totals for the HPV vaccine in 2017, there were over 300,000 adverse events recorded, and more than 400 deaths, following HPV vaccination. (2,3 )
In the UK, the MHRA collects Yellow Card reports of adverse events.
Hinks has commented on the inconsistent nature of replies from the MHRA, and the confusion this may cause (3).
However, a Freedom of Information request to the MHRA last year, revealed that in the period May 2006- -Feb 2018, in the UK, adverse event reports for the HPV vaccine totalled 3194, total reactions 12,783, fatal outcome reports, 8. (4)
(NB The MHRA will email copies of FOI reports to interested people. The BMJ has seen the emails from the MHRA, which confirm these figures ).
Tim Palmer appears to make light of concerns that have been expressed about safety issues with the HPV vaccine. The background to these concerns has been comprehensively referenced and discussed in a recent book (5). An awareness of these safety issues is essential when individual young people and/or their parents are being acquainted with what is known about the HPV vaccine.
The UK Supreme Court judgement, re Montgomery, in 2015, made that quite clear. (6,7)
Palmer’s final sentence, “ This is a veritable triumph for medicine “, is his opinion.
His opinion does not diminish the very clear clinical responsibilities that follow from the Montgomery judgement.
Unless information is provided, by the vaccinator, about the risks, rare or not, valid informed consent is not possible.
This article, together with Palmer’s remarks re “ no serious adverse effects “ may be widely read.
Perhaps distributed freely, as an educational reprint, to doctors.
Doctors may be encouraged by Palmer’s views not to consider or mention to patients the evidence of serious adverse events following HPV vaccination referred to above. If they didn’t, it could invalidate any consent (to any intervention) that was given.
The England and Wales High Court recently awarded a patient £4.4 million in damages following a failure to obtain informed consent (9).
Have Palmer and the other authors considered how their paper might influence this aspect of practice ?
2 https://www.bmj.com/content/358/bmj.j3414/rr-22
3 https://www.bmj.com/content/358/bmj.j3414/rr-13
4 https://www.gov.uk/government/publications/mhra-requests-under-the-freed...
FOI 18/014 Human Papilloma Virus (HPV) Vaccine Drug Analysis Print
5 Mary Holland, J.D, KIM Mack Rosenberg J.D., and Eileen Iorio.
The HPV Vaccine on Trial. Skyhorse Publishing 2018.
6 https://www.supremecourt.uk/cases/docs/uksc-2013-0136-judgment.pdf
7 https://www.bmj.com/content/357/bmj.j2224
8 https://www.supremecourt.uk/decided-cases/docs/UKSC_2013_0136_Judgment.pdf
Competing interests: No competing interests
Response to Rapid responses 7iv2019
As the Corresponding Author for the above paper, I thank John Stone, Peter Selley, Juan Gervas and Christopher Exley for their comments. We have considered their comments, and offer the following response.
John Stone. Cervical screening programmes have reduced the incidence of invasive cervical cancer. The rationale for cervical cancer screening is based on the detection (and management of) of pre-invasive lesions: CIN2 and CIN3, thereby preventing progression to invasive cancer. It is therefore a reasonable expectation that the reduction of CIN2 and CIN3 described in the paper will lead to a reduction in cancer. The paper does not show a reduction in cancer due to the natural history of the disease and the time frame of assessment, given that immunised women are only just reaching the age at which they might be diagnosed with cancer. However cervical screening systems and cancer registries in the UK are set up in a way that will allow us to monitor cancer incidence in immunised cohorts in due course. Scotland is in the process of analysing data on the longer term efficacy of immunisation, including cohorts in which cancers have been diagnosed.
We believe that the recent rise in invasive cancer in England (in a particular age cohort) to which Mr Stone refers reflects changes in screening practice, as indicated by Sasieni and Castenon, and note that it has occurred in a cohort of largely unvaccinated women. The commitment to longitudinal monitoring in Scotland of both pre-invasive and invasive disease stratified by age and immunisation status will be of value in understanding why this increase has been observed. Given the changes in pre-invasive disease observed in 20-year olds, and the natural history of CIN and invasive cancer, HPV immunisation is unlikely to be a relevant factor.
Peter Selley. The reduction in the numbers of terminations of pregnancy in Scotland will have many causes, including the availability of emergency birth control and changes in contraception practice. Arguably data on STI are a better indicator of changes in sexual behaviour than the rates for termination of pregnancy. The data on HPV prevalence in cervical samples (Kavanagh et al, Lancet Infectious Diseases 2017) have shown that other high risk HPV did not decrease while 16/18/31/33/45 did. This suggests that sexual behaviour has not changed and that reduction of aforementioned types is strongly driven by immunisation. Obtaining robust proxies of sexual behaviour is challenging and we could not capture specific information on this aspect within this population based study. While we accept that temporal changes in sexual behaviour may have had an influence on the observations, we would suggest that it would be unlikely solely account for the significant reductions observed.
Juan Gervas. We accept that this is an observational study with associated unavoidable limitations; however we would reject the notion that the results are “clinically irrelevant”. The published evidence of vaccination on both HPV and clinical outcomes in the UK and elsewhere shows that there are already benefits to women and health care systems from reduced referral for colposcopy for high grade disease. The effect of an intervention on the absolute risk of a disease such as cervical cancer, which has a long natural history, will take time to become apparent. The timeframe of the study, and nature of the cohorts involved – those attending for first screen - means that we cannot determine impact over a life time at this stage. However, we are committed to monitoring the longitudinal impact of vaccine in women to address this.
Christopher Exley. The references cited in the introduction to the paper give the global and Scottish background to the significance of cervical cancer as a disease. With regard to the specific questions raised about the attendance for screening and the performance of the Scottish Screening programme, these have been considered in the Discussion. Additionally, national statistics on the performance and uptake of screening, the incidence and mortality from cervical cancer and the incidence of pre-invasive disease are reported and published, and aggregated data are accessible online.
With regard to serious adverse reactions to the vaccine, we have not included a discussion on vaccine safety because the purpose of this particular study is the evaluate vaccine effectiveness. However, in her linked Editorial, Professor Julia Brotherton does address the question of vaccine safety. In Scotland and the UK, as elsewhere, we monitor vaccine safety routinely and have shown no serious adverse effects that can be objectively linked to the administration of the vaccine. (Cameron R et al, Intern Med J. 2016 Apr;46(4):452-7. doi: 10.1111/imj.13005; Skufka J et al, Vaccine 36 (2018) 5926–5933).
Although no reduction on invasive disease has yet been demonstrated, this is a function of the length time since the introduction of the vaccines, the biology of the oncogenesis by HPV, and the characteristics of the screening programme. As noted above in the response to Mr Stone, the very success of cytology-based screening programmes, predicated as they are on the detection and treatment of CIN2 and CIN3, indicates that the reduction in CIN2 and CIN3 incontrovertibly demonstrated in this paper will be followed by a reduction in invasive cancer in the near future.
The wider context within which HPV immunisation should be considered is set out in the accompanying editorial and opinion piece.
Competing interests: No competing interests
Success inevitably depends on what you are measuring [1]. The HPV vaccines were marketed not on their ability reduce Human Papilloma viruses but on their ability to reduce cervical cancer, but manifestly this has not happened. In a recent article Castanon and Sasieni 'Is the recent increase in cervical cancer in women aged 20–24 years in England a cause for concern?' [2] argue that the steep rise in England of cervical cancers in what is the first generation of women targeted with these products is an artefact of lowering the screening age by seven months, but manifestly the levels have not gone down. I cannot help thinking a lowering of incidence of cervical cancer rates among young women our health officials would be shouting it from the roofs. And it has not happened.
[1] Palmer et al, '
Prevalence of cervical disease at age 20 after immunisation with bivalent HPV vaccine at age 12-13 in Scotland: retrospective population study',
BMJ 2019; 365 doi: https://doi.org/10.1136/bmj.l1161 (Published 03 April 2019)
[2] Alejandra Castanon, Peter Sasieni, 'Is the recent increase in cervical cancer in women aged 20–24 years in England a cause for concern?', Preventive Medicine Volume 107, February 2018, Pages 21-28, https://www.sciencedirect.com/science/article/pii/S0091743517304802
Competing interests: No competing interests
Could the falling prevalence of pre-malignant cervical disease in young women in Scotland be related to a change in sexual behaviour over the last few years?
Since 2008 - the same period examined in this study - the number of terminations of pregnancy in women under 20 in Scotland has halved, and the termination rate in the under 16 age group has fallen from 4.0 to 1.3 per thousand.
Reference
Termination of Pregnancy Year ending December 2017, NHS Scotland
https://www.isdscotland.org/Health-Topics/Sexual-Health/Publications/201...
Competing interests: No competing interests
The study is interesting but with all the limitations of an observational study.
Unfortunately, no data are given to calculate the absolute risk.
It would be necessary to access raw data.
The best approximate calculation of the absolute risk allows us to calculate an NNT of 4,300 for CIN 3 and worse. This result is clinically irrelevant.
It would be very important that the journal give access to the complete data, even in complementary tables.
Competing interests: No competing interests
I would like the authors of this 'encouraging' observation to put their findings in context. Usually this is done in the Introduction of published science. While these observations do not pertain to cervical cancer per se it would be helpful for the reader to know how many individuals die in Scotland due to cervical cancer each year. Of those deaths how many could be attributed to medical misconduct, such as errors in cervical screening, and how many could be attributed to individuals not attending cervical cancer screening on a regular basis. Basic information of this ilk makes it clear to those reading this paper why a vaccine for cervical cancer is necessary.
The authors make no mention of serious adverse events following vaccination. This is a serious omission. The authors have significant populations of both unvaccinated and fully vaccinated individuals and as such are perfectly placed to compare serious adverse events in these two populations. For example, Merck's own data show a serious adverse event rate of approximately 2.5% in those receiving Gardasil. Included in the category of serious adverse events is death and it would be informative to know how many of the vaccinated group were affected by a serious adverse event. Similarly, statistics should be available to compare the health of the unvaccinated and vaccinated group.
It will be many years before data become available to show whether or not vaccination against HPV has any benefit for cervical cancer above and beyond the tremendous successes achieved by the cervical screening programme. In the interim years we should be using information available not only to look at the possible benefits of vaccination but also to test the safety of vaccination.
I am a scientist and I do not care for 'policy' dressed up as research. The authors have privileged access to human data and it should be used judiciously to cover all aspects of both efficacy AND safety of this vaccine. If the authors are not willing to do this then can I ask them to make their database available to others who will do this.
Competing interests: During the past five years CE has received research grants from MRC, EPSRC, CMSRI and Bencard Allergie. CMSRI is a not-for-profit charity based in Washington, DC.
Re: Prevalence of cervical disease at age 20 after immunisation with bivalent HPV vaccine at age 12-13 in Scotland: retrospective population study
This study only looked at 12- and 13-year-old girls, a population that is not sexually active. However, during clinical trials of the HPV vaccine in the U.S., the FDA evaluated the potential of Gardasil "to enhance cervical disease in subjects who had evidence of persistent infection with vaccine-relevant HPV types prior to vaccination." The results showed a -45% (negative 45%) efficacy in this subgroup. "Subjects who were seropositive and PCR-positive for the vaccine-relevant HPV types had a greater number of CIN 2/3 or worse cases" compared to unvaccinated females. This is why vaccinating young girls before they become sexually active is important. The Palmer et al Scottish study did not include older teens and women who are sexually active, have been exposed to HPV prior to HPV-vaccination, and are likely to have significantly worse outcomes than unvaccinated females.
Citation:
VRBPAC Background Document. Gardasil HPV Quadrivalent Vaccine May 18, 2006 VRBPAC Meeting. (See Table 17, page 13.) https://zenodo.org/record/1434214
Competing interests: No competing interests