Gardasil, technically known as recombinant human papillomavirus vaccine [types 6, 11, 16, 18],[3][4][5][6][7] is a vaccine for use in the prevention of certain strains of human papillomavirus (HPV).[8] High-risk human papilloma virus (hr-HPV) genital infection is the most common sexually transmitted infection among women.[9] The HPV strains that Gardasil protects against are sexually transmitted,[10] specifically HPV types 6, 11, 16 and 18.[11][12] HPV types 16 and 18 cause an estimated 70% of cervical cancers,[13][14] and are responsible for most HPV-induced anal,[15] vulvar, vaginal,[16] and penile cancer cases.[15] HPV types 6 and 11 cause an estimated 90% of genital warts cases.[17] Though Gardasil does not treat existing infection, vaccination is still recommended for HPV-positive individuals, as it may protect against one or more different strains of the disease.[18]

گارداسيل
Gardasil vaccine and box new.jpg
وصف اللقاح
TargetFor Gardasil 9: Human papillomavirus, Types 6, 11, 16, 18, 31, 33, 45, 52, and 58
نوع اللقاحو.ف. پروتينية
البيانات السريرية
الأسماء التجاريةGardasil, Gardisil, Silgard, others
AHFS/Drugs.comMonograph
MedlinePlusa607016
فئة السلامة
أثناء الحمل
مسارات
الدواء
Intramuscular injection
رمز ATC
الحالة القانونية
الحالة القانونية
  • UK: POM (Prescription only) [2]
  • US: ℞-only
  • عموماً: ℞ (بوصفة فقط)
المعرفات
DrugBank
ChemSpider
  • none
UNII
KEGG
 ☒NYesY (what is this?)  (verify)
Gardasil

The vaccine was approved for medical use in the United States in 2006,[19][20] initially for use in females aged 9–26.[21] In 2007, the Advisory Committee on Immunization Practices (ACIP) recommended gardasil for routine vaccination of girls aged 11 and 12 years.[22] As of August 2009, vaccination was recommended before adolescence and the beginning of potential sexual activity.[11][23][24] By 2011, the vaccine had been approved in 120 other countries.[25]

In 2014, the FDA approved a nine-valent version, Gardasil 9, to protect against infection with the strains covered by the first generation of Gardasil as well as five other HPV strains responsible for 20% of cervical cancers (types 31, 33, 45, 52, and 58).[3][26][27] In 2018, the FDA approved expanded use of Gardasil 9 for individuals 27 through 45 years old.[28]

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الاستخدامات الطبية

In the United States, Gardasil is indicated for:[29]

  • girls and women 9 through 45 years of age for the prevention of the following diseases:[29]
    • Cervical, vulvar, vaginal, anal, oropharyngeal and other head and neck cancers caused by Human Papillomavirus (HPV) types 16, 18, 31, 33, 45, 52, and 58.[29]
    • Genital warts (condyloma acuminata) caused by HPV types 6 and 11.[29]
  • girls and women 9 through 45 years of age for the following precancerous or dysplastic lesions caused by HPV types 6, 11, 16, 18, 31, 33, 45, 52, and 58:[29]
    • Cervical intraepithelial neoplasia (CIN) grade 2/3 and cervical adenocarcinoma in situ (AIS).[29]
    • Cervical intraepithelial neoplasia (CIN) grade 1.[29]
    • Vulvar intraepithelial neoplasia (VIN) grade 2 and grade 3.[29]
    • Vaginal intraepithelial neoplasia (VaIN) grade 2 and grade 3.[29]
    • Anal intraepithelial neoplasia (AIN) grades 1, 2, and 3.[29]
  • boys and men 9 through 45 years of age for the prevention of the following diseases:[29]
    • Anal, oropharyngeal and other head and neck cancers caused by HPV types 16, 18, 31, 33, 45, 52, and 58.[29]
    • Genital warts (condyloma acuminata) caused by HPV types 6 and 11.[29]
  • boys and men 9 through 45 years of age for the following precancerous or dysplastic lesions caused by HPV types 6, 11, 16, 18, 31, 33, 45, 52, and 58:[29]
    • Anal intraepithelial neoplasia (AIN) grades 1, 2, and 3.[29]

In the European Union, Gardasil is indicated for active immunization of individuals from the age of nine years against the following HPV diseases:[6]

  • Premalignant lesions and cancers affecting the cervix, vulva, vagina and anus caused by vaccine HPV types[6]
  • Genital warts (Condyloma acuminata) caused by specific HPV types.[6]

Gardasil is a vaccine to prevent HPV, that, for maximum effect, is recommended for girls prior to their becoming sexually active.[بحاجة لمصدر] Moreover, evidence supports the conclusion that women who were already infected with one or more of the four HPV types targeted by the vaccine (HPV types 6, 11, 16, or 18) were protected from clinical disease caused by the remaining HPV types in the vaccine.[18] HPV types 16 and 18 cause an estimated 70% of cervical cancers,[13][14] and are responsible for most HPV-induced anal cancers.[15] Gardasil also protects against vulvar and vaginal cancers caused by HPV types 16 and 18,[16] as well as most penile cancers caused by these two HPV types.[30] Since Gardasil will not prevent infection with all of the HPV types that can cause cervical cancer, the vaccine is not considered a substitute for routine pap smears.[بحاجة لمصدر]

In addition, protection against HPV types 6 and 11 may eliminate up to 90% of the cases of genital warts.[17] Common plantar warts—e.g., caused by HPV types 1, 2, and 4[31]—are not prevented by this vaccine.

Reports state the expectation that fewer HPV infections will necessarily lead to fewer complications from the virus, and less time and money spent on the detection, work-up, and treatment of cervical cancer (and its precursor, cervical dysplasia).[18] In addition, it is expected that vaccination will reduce the severe respiratory problems of laryngeal papillomatosis in children infected with HPV by their mothers,[بحاجة لمصدر] and that it will prevent infertility caused by cervical biopsies.[بحاجة لمصدر]

In 2010, Gardasil was approved by the FDA for prevention of anal cancer and associated precancerous lesions due to HPV types 6, 11, 16, and 18 in people ages 9 through 26 years.[32]

HPV infections, especially HPV 16, contribute to some head and neck cancer (HPV is found in an estimated 26–35% of head and neck squamous cell carcinoma).[33][34] In principle, HPV vaccines may help reduce incidence of such cancers caused by HPV, but this has not been demonstrated.[35][needs update] In June 2020, the FDA approved the use of Gardasil for the treatment of head and neck cancers.[36][37]

The FDA approved Gardasil 9 for women and men aged 27 to 45 based on the vaccine being 88% effective against persistent HPV infections that cause certain types genital warts and cancers in females. Vaccine efficacy in males in this age group was inferred.[28]


الفعالية

An alternative vaccine known as Cervarix protects against two oncogenic strains of HPV, 16 and 18.[38]

The National Cancer Institute says, "To date, protection against the targeted HPV types has been found to last for at least 10 years with Gardasil (10), at least 9 years with Cervarix (11), and at least 6 years with Gardasil 9 (12). Long-term studies of vaccine efficacy that are still in progress will help scientists better understand the total duration of protection."[39]

Gardasil has been shown to be partially effective (approximately 38%) in preventing cervical cancer caused by ten other high-risk HPV types.[40]

Antibody levels at month 3 (one month post-dose number two) are substantially higher than at month 24 (18 months post-dose number three), suggesting that protection is achieved by month 3 and perhaps earlier.[23] In 2014, the World Health Organization (WHO) recommended that countries offer the vaccine in a two dose schedule to girls aged under 15, with each dose at least six months apart.[41][17] The United Kingdom, Switzerland, Mexico, and Quebec province of Canada are among the countries or territories that have implemented this اعتبارا من June 2015. The CDC recommended the vaccines be delivered in two shots over six months.[42]

الذكور

Gardasil is also effective in males, providing protection against genital warts, anal warts, anal cancer, and some potentially precancerous lesions caused by some HPV types.[12][43] Gardasil vaccine has been shown to decrease the risk of young men contracting genital warts.[44] In the United States, the FDA approved administration of the Gardasil vaccine to males between ages 9 and 26 in 2009.[45][46] The FDA approved administration of the Gardasil 9 vaccine to males between ages 9 and 15 in 2014, and extended the age indication, by including males between ages 16 and 26, in 2015.[47][48][49] In the UK, HPV vaccines are licensed for males aged 9 to 15 and for females aged 9 to 26.[50]

Men who have sex with men (MSM) are particularly at risk for conditions associated with HPV types 6, 11, 16, and 18; diseases and cancers that have a higher incidence among MSM include anal intraepithelial neoplasias, anal cancers, and genital warts. Type 16 is also associated with oropharyngeal squamous-cell carcinoma, a form of throat cancer.[51] A 2005 study found that 95% of HIV-infected gay men also had anal HPV infection, of whom 50% had precancerous HPV-caused lesions.[52]

إعطاء اللقاح

Gardasil is given in three injections over six months. The second injection is two months after the first, and the third injection is six months after the first shot was administered.[11][23] Alternatively, in some countries it is given as two injections with at least six months between them, for individuals aged 9 years up to and including 13 years.[2][53]

Adverse effects

اعتبارا من April 2014, more than 170 million doses of Gardasil had been distributed worldwide.[54] The vaccine was tested in thousands of females (ages 9 to 26).[55] The Food and Drug Administration (FDA) and the Centers for Disease Control and Prevention (CDC) consider the vaccine to be safe. It does not contain mercury, thiomersal, live viruses or dead viruses, but virus-like particles, which cannot reproduce in the human body.[55]

The vaccine has mostly minor side effects, such as pain around the injection area.[55] Fainting is more common among adolescents receiving the Gardasil vaccine than in other kinds of vaccinations. Patients should remain seated for 15 minutes after they receive the HPV vaccine.[23] There have been reports that the shot is more painful than other common vaccines, and the manufacturer Merck partly attributes this to the virus-like particles within the vaccine.[56] General side effects of the shot may include joint and muscle pain, fatigue, physical weakness and general malaise.[23][57]

The FDA and the CDC said that with millions of vaccinations "by chance alone some serious adverse effects and deaths" will occur in the time period following vaccination, but they have nothing to do with the vaccine.[58] More than twenty women who received the Gardasil vaccine have died, but these deaths have not been causally connected to the shot, as correlation does not imply causation.[58] Where information has been available, the cause of death was explained by other factors.[59][60] Likewise, a small number of cases of Guillain–Barré syndrome (GBS) have been reported following vaccination with Gardasil, though there is no evidence linking GBS to the vaccine.[24][61][62] It is unknown why a person develops GBS, or what initiates the disease.[63]

The FDA and the CDC monitor events to see if there are patterns, or more serious events than would be expected from chance alone.[59] The majority (68%) of side effects data were reported by the manufacturer, but in about 90% of the manufacturer reported events, no follow-up information was given that would be useful to investigate the event further.[64] In February 2009, the Spanish Ministry of Health suspended use of one batch of Gardasil after health authorities in the Valencia region reported that two girls had become ill after receiving the injection. Merck has stated that there was no evidence Gardasil was responsible for the two illnesses.[65]

Ingredients

The following are the ingredients found in the different formulations of HPV vaccines:[66]

Biotechnology

The HPV major capsid protein, L1, can spontaneously self-assemble into virus-like particles (VLPs) that resemble authentic HPV virions. Gardasil contains recombinant VLPs assembled from the L1 proteins of HPV types 6, 11, 16 and 18. Since VLPs lack the viral DNA, they cannot induce cancer. They do, however, trigger an antibody response that protects vaccine recipients from becoming infected with the HPV types represented in the vaccine. The L1 proteins are produced by separate fermentations in recombinant Saccharomyces cerevisiae and self-assembled into VLPs.[67]

الصحة العامة

كتب معهد السرطان الوطني:

Widespread HPV vaccination has the potential to reduce cervical cancer incidence around the world by as much as 90%. In addition, the vaccines may reduce the need for screening and subsequent medical care, biopsies, and invasive procedures associated with follow-up from abnormal cervical screening, thus helping to reduce health care costs and anxieties related to follow-up procedures.[39]


History

Research findings that pioneered the development of the vaccine began in 1991 by investigators Jian Zhou and Ian Frazer in The University of Queensland, Australia. Researchers at UQ found a way to form non-infectious virus-like particles (VLP), which could also strongly activate the immune system. Subsequently, the final form of the vaccine was developed in parallel, by researchers at Georgetown University Medical Center, the University of Rochester, the University of Queensland in Australia, and the U.S. National Cancer Institute.[68]

In December 2014, the FDA approved Gardasil-9, which protects against nine strains of HPV.[69]

المجتمع والثقافة

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الولايات المتحدة

اليابان

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Further reading

External links