Pharmacotherapeutic group: Viral Vaccine, ATC code: J07BM01
Mechanism of Action
Gardasil is an adjuvanted non-infectious recombinant quadrivalent vaccine prepared from the highlypurified virus-like particles (VLPs) of the major capsid L1 protein of HPV types 6, 11, 16 and 18. The
VLPs contain no viral DNA, they cannot infect cells, reproduce or cause disease. HPV only infectshumans, but animal studies with analogous papillomaviruses suggest that the efficacy of LI VLPvaccines is mediated by the development of a humoral immune response.
HPV 16 and HPV 18 are estimated to be responsible for approximately 70 % of cervical cancers and75-80 % of anal cancers; 80 % of adenocarcinoma in situ (AIS); 45-70 % of high-grade cervicalintraepithelial neoplasia (CIN 2/3); 25 % of low grade cervical intraepithelial neoplasia (CIN 1);approximately 70 % of HPV related high-grade vulvar (VIN 2/3) and vaginal (VaIN 2/3)intraepithelial neoplasia and 80 % of HPV related high-grade anal (AIN 2/3) intraepithelial neoplasia.
HPV 6 and 11 are responsible for approximately 90 % of genital warts and 10 % of low grade cervicalintraepithelial neoplasia (CIN 1). CIN 3 and AIS have been accepted as immediate precursors ofinvasive cervical cancer.
The term 'premalignant genital lesions' in section 4.1 corresponds to high-grade cervicalintraepithelial neoplasia (CIN 2/3), high-grade vulvar intraepithelial neoplasia (VIN 2/3) and high-grade vaginal intraepithelial neoplasia (VaIN 2/3).
The term 'premalignant anal lesions' in section 4.1 corresponds to high-grade anal intraepithelialneoplasia (AIN 2/3).
The indication is based on the demonstration of efficacy of Gardasil in females 16 to 45 years of ageand in males 16 to 26 years of age and on the demonstration of immunogenicity of Gardasil in 9- to15-year old children and adolescents.
Clinical Studies
Efficacy in women 16 through 26 years
The efficacy of Gardasil in 16- through 26 year-old women was assessed in 4 placebo-controlled,double-blind, randomised Phase II and III clinical studies including a total of 20,541 women, whowere enrolled and vaccinated without pre-screening for the presence of HPV infection.
The primary efficacy endpoints included HPV 6-, 11-, 16-, or 18-related vulvar and vaginal lesions(genital warts, VIN, VaIN) and CIN of any grade and cervical cancers (Protocol 013, FUTURE I),
HPV 16- or 18-related CIN 2/3 and AIS and cervical cancers (Protocol 015, FUTURE II), HPV 6-,11-, 16-, or 18-related persistent infection and disease (Protocol 007), and HPV 16-related persistentinfection (Protocol 005). The primary analyses of efficacy, with respect to vaccine HPV types (HPV 6,11, 16, and 18), were conducted in the per-protocol efficacy (PPE) population (i.e., all 3 vaccinationswithin 1 year of enrollment, no major protocol deviations and naïve to the relevant HPV type(s) priorto dose 1 and through 1 month Postdose 3 (Month 7)).
Efficacy results are presented for the combined analysis of study protocols. The efficacy for
HPV 16/18 related CIN 2/3 or AIS is based on data from protocols 005 (16-related endpoints only),007, 013, and 015. The efficacy for all other endpoints is based on protocols 007, 013, and 015. Themedian duration of follow-up for these studies was 4.0, 3.0, 3.0, and 3.0 years for Protocol 005,
Protocol 007, Protocol 013, and Protocol 015, respectively. The median duration of follow-up for thecombined protocols (005, 007, 013, and 015) was 3.6 years. Results of individual studies support theresults from the combined analysis. Gardasil was efficacious against HPV disease caused by each ofthe four vaccine HPV types. At end of study, individuals enrolled in the two Phase-III studies(Protocol-013 and Protocol-015), were followed for up to 4 years (median 3.7 years).
Cervical Intraepithelial Neoplasia (CIN) Grade 2/3 (moderate to high-grade dysplasia) andadenocarcinoma in situ (AIS) were used in the clinical trials as a surrogate marker for cervical cancer.
In the long-term extension study of Protocol 015, 2,536 women 16-23 years old during vaccinationwith Gardasil in the base study were followed. In the PPE population no cases of HPV diseases (HPVtypes 6/11/16/18 related high grade CIN) were observed up to approximately 14 years (median follow-up of 11.9 years). In this study, a durable protection was statistically demonstrated to approximately12 years.
Efficacy in women naïve to the relevant vaccine HPV type(s)
Efficacy was measured starting after the Month 7 visit. Overall, 73 % of women were naïve (PCRnegative and seronegative) to all 4 HPV types at enrolment.
The efficacy results for relevant endpoints analysed at 2 years post-enrolment and at end of study(median duration of follow-up = 3.6 years) in the per-protocol population are presented in the Table 2.
In a supplemental analysis, the efficacy of Gardasil was evaluated against HPV 16/18-related CIN 3and AIS.
Table 2: Analysis of efficacy of Gardasil against high grade cervical lesions in the PPE population
Gardasil Placebo % Gardasil Placebo %
Number of Number of Efficacy Number of Number of Efficacy***cases cases at 2 cases cases at end of
Number of Number of years Number of Number of studyindividuals* individuals* (95 % individuals* individuals* (95 % CI)
CI)
HPV 0 53 100.0 2** 112 98.216/18- 8487 8460 (92.9, 8493 8464 (93.5, 99.8)related 100.0)
CIN 2/3 or
AIS
HPV 0 29 100 2** 64 96.916/18- 8487 8460 (86.5, 8493 8464 (88.4, 99.6)related 100.0)
CIN 3
HPV 0 6 100 0 7 10016/18- 8487 8460 (14.8, 8493 8464 (30.6,related 100.0) 100.0)
AIS
*Number of individuals with at least one follow-up visit after Month 7
**Based on virologic evidence, the first CIN 3 case in a patient chronically infected with HPV 52 is likely to becausally related to HPV 52. In only 1 of 11 specimens HPV 16 was found (at Month 32.5) and was not detectedin tissue excised during LEEP (Loop Electro-Excision Procedure). In the second CIN 3 case observed in apatient infected with HPV 51 at Day 1 (in 2 of 9 specimens); HPV 16 was detected at a Month 51 biopsy (in 1 of9 specimens) and HPV 56 was detected in 3 of 9 specimens at Month 52 in tissue excised during LEEP.
***Patients were followed for up to 4 years (median 3.6 years)
Note: Point estimates and confidence intervals are adjusted for person-time of follow-up.
At end of study and in the combined protocols,
* the efficacy of Gardasil against HPV 6-, 11-, 16-, 18-related CIN 1 was 95.9 % (95 % CI: 91.4,98.4),
* the efficacy of Gardasil against HPV 6-, 11-, 16-, 18-related CIN (1, 2, 3) or AIS was 96.0 %(95 % CI: 92.3, 98.2),
* the efficacy of Gardasil against HPV 6-, 11-, 16-, 18-related VIN2/3 and VaIN 2/3 was 100 %(95 % CI: 67.2, 100) and 100 % (95 % CI: 55.4, 100), respectively,
* the efficacy of Gardasil against HPV 6-, 11-, 16-, 18-related genital warts was 99.0 % (95 % CI:
96.2, 99.9).
In Protocol 012 the efficacy of Gardasil against the 6 month definition of persistent infection [samplespositive on two or more consecutive visits 6 months apart (±1 month) or longer] related to HPV 16was 98.7 % (95 % CI: 95.1, 99.8) and 100.0 % (95 % CI: 93.2, 100.0) for HPV 18 respectively, after afollow-up of up to 4 years (mean of 3.6 years). For the 12 month definition of persistent infection,efficacy against HPV 16 was 100.0 % (95 % CI: 93.9, 100.0) and 100.0 % (95 % CI: 79.9, 100.0) for
HPV 18 respectively.
Efficacy in women with evidence of HPV 6, 11, 16, or 18 infection or disease at day 1
There was no evidence of protection from disease caused by vaccine HPV types for which womenwere PCR positive at day 1. Women who were already infected with one or more vaccine-related HPVtypes prior to vaccination were protected from clinical disease caused by the remaining vaccine HPVtypes.
Efficacy in women with and without prior infection or disease due to HPV 6, 11, 16, or 18
The modified intention to treat (ITT) population included women regardless of baseline HPV status at
Day 1, who received at least one vaccination and in whom case counting started at 1 month Postdose1. This population approximates to the general population of women with respect to prevalence of
HPV infection or disease at enrolment. The results are summarised in Table 3.
Table 3: Efficacy of Gardasil in high grade cervical lesions in the modified ITT-population includingwomen regardless of baseline HPV status
Gardasil Placebo Gardasil Placebo %
Number of Number of % Number of Number ofcases cases Efficacy** Efficacy**cases cases at end ofat 2 years
Number of Number of Number of Number of study(95 % CI)individuals* individuals* individuals* individuals* (95 % CI)
HPV 16- 122 201 39.0 146 303 51.8or HPV 9831 9896 (23.3, 9836 9904 (41.1,18-related 51.7) 60.7)
CIN 2/3or AIS
HPV 83 127 34.3 103 191 46.016/18- 9831 9896 (12.7, 9836 9904 (31.0,related 50.8) 57.9)
CIN 3
HPV 5 11 54.3 6 15 60.016/18- 9831 9896 (<0, 87.6) 9836 9904 (<0, 87.3)related
AIS
*Number of individuals with at least one follow-up visit after 30 days after Day 1
**Percent efficacy is calculated from the combined protocols. The efficacy for HPV 16/18 related CIN 2/3 or
AIS is based on data from protocols 005 (16-related endpoints only), 007, 013, and 015. Patients were followedfor up to 4 years (median 3.6 years).
Note: point estimates and confidence intervals are adjusted for person-time of follow-up.
Efficacy against HPV 6-, 11-, 16-, 18-related VIN 2/3 was 73.3 % (95 % CI: 40.3, 89.4), against
HPV 6-, 11-, 16-, 18-related VaIN 2/3 was 85.7 % (95 % CI: 37.6, 98.4), and against HPV 6-, 11-, 16-, 18-related genital warts was 80.3 % (95 % CI: 73.9, 85.3) in the combined protocols at end of study.
Overall 12 % of the combined study population had an abnormal Pap test suggestive of CIN at Day 1.
Among women with an abnormal Pap test at Day 1 who were naïve to the relevant vaccine HPV typesat Day 1, efficacy of the vaccine remained high. Among women with an abnormal Pap test at Day 1who were already infected with the relevant vaccine HPV types at Day 1, no vaccine efficacy wasobserved.
Protection Against the Overall Burden of Cervical HPV disease in 16- Through 26-Year-Old Women
The impact of Gardasil against the overall risk for cervical, HPV disease (i.e., disease caused by any
HPV type) was evaluated starting 30 days after the first dose in 17,599 individuals enrolled in the two
Phase III efficacy trials (Protocols 013 and 015). Among women who were naïve to 14 common HPVtypes and had a negative Pap test at Day 1, administration of Gardasil reduced the incidence of
CIN 2/3 or AIS caused by vaccine- or non-vaccine HPV types by 42.7 % (95 % CI: 23.7, 57.3) and ofgenital warts by 82.8 % (95 % CI: 74.3, 88.8) at end of study.
In the modified ITT population, the benefit of the vaccine with respect to the overall incidence of
CIN 2/3 or AIS (caused by any HPV type) and of genital warts was much lower, with a reduction of18.4 % (95 % CI: 7.0, 28.4) and 62.5 % (95 % CI: 54.0, 69.5), respectively, as Gardasil does notimpact the course of infections or disease that are present at vaccination onset.
Impact on Definitive Cervical Therapy Procedures
The impact of Gardasil on rates of Definitive Cervical Therapy Procedures regardless of causal HPVtypes was evaluated in 18,150 individuals enrolled in Protocol 007, Protocols 013 and 015. In the HPVnaïve population (naïve to 14 common HPV types and had a negative Pap test at Day 1), Gardasilreduced the proportion of women who experienced a definitive cervical therapy procedure (Loop
Electro-Excision Procedure or Cold-Knife Conization) by 41.9 % (95 % CI: 27.7, 53.5) at end ofstudy. In the ITT population the corresponding reduction was 23.9 % (95 % CI: 15.2, 31.7).
Cross-protective efficacy
The efficacy of Gardasil against CIN (any grade) and CIN 2/3 or AIS caused by 10 non-vaccine HPVtypes (HPV 31, 33, 35, 39, 45, 51, 52, 56, 58, 59) structurally related to HPV 16 or HPV 18 wasevaluated in the combined Phase III efficacy database (N = 17,599) after a median follow-up of3.7 years (at end of study). Efficacy against disease endpoints caused by pre-specified combinations ofnon-vaccine HPV types was measured. The studies were not powered to assess efficacy againstdisease caused by individual HPV types.
The primary analysis was done in type-specific populations that required women to be negative for thetype being analysed, but who could be positive for other HPV types (96 % of the overall population).
The primary time point analysis after 3 years did not reach statistical significance for all pre-specifiedendpoints. The final end-of-study results for the combined incidence of CIN 2/3 or AIS in thispopulation after a median follow-up of 3.7 years are shown in Table 4. For composite endpoints,statistically significant efficacy against disease was demonstrated against HPV types phylogeneticallyrelated to HPV 16 (primarily HPV 31) whereas no statistically significant efficacy was observed for
HPV types phylogenetically related to HPV 18 (including HPV 45). For the 10 individual HPV types,statistical significance was only reached for HPV 31.
Table 4: Results for CIN 2/3 or AIS in Type-Specific HPV-Naïve Individuals † (end of study results)
Naïve to ≥ 1 HPV Type
Gardasil Placebo
Composite Endpoint cases cases % Efficacy 95 % CI(HPV 31/45) ‡ 34 60 43.2 % 12.1, 63.9(HPV 31/33/45/52/58) § 111 150 25.8 % 4.6, 42.510 non-vaccine HPV 162 211 23.0 % 5.1, 37.7
Types║
HPV-16 related types 111 157 29.1 % 9.1, 44.9(A9 species)
HPV 31 23 52 55.6 % 26.2, 74.1†
HPV 33 29 36 19.1 % <0, 52.1†
HPV 35 13 15 13.0 % <0, 61.9†
HPV 52 44 52 14.7 % <0, 44.2†
HPV 58 24 35 31.5 % <0, 61.0†
HPV-18 related types 34 46 25.9 % <0, 53.9(A7 species)
HPV 39 15 24 37.5 % <0, 69.5†
HPV 45 11 11 0.0 % <0, 60.7†
HPV 59 9 15 39.9 % <0, 76.8†
A5 species (HPV 51) 34 41 16.3 % <0, 48.5†
A6 species (HPV 56) 34 30 -13.7 % <0, 32.5†† The studies were not powered to assess efficacy against disease caused by individual HPV types.‡ Efficacy was based on reductions in HPV 31-related CIN 2/3 or AIS§ Efficacy was based on reductions in HPV 31-, 33-, 52-, and 58-related CIN 2/3 or AIS║ Includes assay-identified non-vaccine HPV types 31, 33, 35, 39, 45, 51, 52, 56, 58, and 59.
Efficacy in women 24 through 45 years
The efficacy of Gardasil in 24- through 45 year-old women was assessed in 1 placebo-controlled,double-blind, randomised Phase III clinical study (Protocol 019, FUTURE III) including a total of3,817 women, who were enrolled and vaccinated without pre-screening for the presence of HPVinfection.
The primary efficacy endpoints included the combined incidence of HPV 6-, 11-, 16- or 18-related andthe combined incidence of HPV 16- or HPV 18-related persistent infection (6 month definition),genital warts, vulvar and vaginal lesions, CIN of any grade, AIS, and cervical cancers. The medianduration of follow-up for this study was 4.0 years.
In the long-term extension study of Protocol 019, 685 women 24-45 years old during vaccination with
Gardasil in the base study were followed. In the PPE population, no cases of HPV diseases (HPVtypes 6/11/16/18 related CIN any grade and Genital Warts) were observed through 10.1 years (medianfollow-up of 8.7 years).
Efficacy in women naïve to the relevant vaccine HPV type(s)
The primary analyses of efficacy were conducted in the per-protocol efficacy (PPE) population (i.e.,all 3 vaccinations within 1 year of enrolment, no major protocol deviations and naïve to the relevant
HPV type(s) prior to dose 1 and through 1 month Postdose 3 (Month 7)). Efficacy was measuredstarting after the Month 7 visit. Overall, 67 % of individuals were naïve (PCR negative andseronegative) to all 4 HPV types at enrolment.
The efficacy of Gardasil against the combined incidence of HPV 6-, 11-, 16-, or 18-related persistentinfection, genital warts, vulvar and vaginal lesions, CIN of any grade, AIS, and cervical cancers was88.7 % (95 % CI: 78.1, 94.8).
The efficacy of Gardasil against the combined incidence of HPV 16- or 18-related persistent infection,genital warts, vulvar and vaginal lesions, CIN of any grade, AIS, and cervical cancers was 84.7 %(95 % CI: 67.5, 93.7).
Efficacy in women with and without prior infection or disease due to HPV 6, 11, 16, or 18
The Full Analysis Set population (also known as the ITT population) included women regardless ofbaseline HPV status at Day 1, who received at least one vaccination and in whom case countingstarted at Day 1. This population approximates to the general population of women with respect toprevalence of HPV infection or disease at enrolment.
The efficacy of Gardasil against the combined incidence of HPV 6-, 11-, 16-, or 18-related persistentinfection, genital warts, vulvar and vaginal lesions, CIN of any grade, AIS, and cervical cancers was47.2 % (95 % CI: 33.5, 58.2).
The efficacy of Gardasil against the combined incidence of HPV 16- or 18-related persistent infection,genital warts, vulvar and vaginal lesions, CIN of any grade, AIS, and cervical cancers was 41.6 %(95 % CI: 24.3, 55.2).
Efficacy in women (16 to 45 years) with evidence of a prior infection with a vaccine HPV type(seropositive) that was no longer detectable at vaccination onset (PCR negative)
In post hoc analyses of individuals (who received at least one vaccination) with evidence of a priorinfection with a vaccine HPV type (seropositive) no longer detectable (PCR negative) at vaccinationonset, the efficacy of Gardasil to prevent conditions due to the recurrence of the same HPV type was100 % (95 % CI: 62.8, 100.0; 0 vs. 12 cases [n = 2572 from pooled studies in young women]) against
HPV 6-, 11-, 16-, and 18-related CIN 2 /3, VIN 2 /3, VaIN 2 /3, and genital warts in women 16 to26 years. Efficacy was 68.2 % (95 % CI: 17.9, 89.5; 6 vs. 20 cases [n = 832 from studies in young andadult women combined]) against HPV 1 6- and 18-related persistent infection in women 16 to 45 years.
Efficacy in men 16 through 26 years
Efficacy was evaluated against HPV 6-, 11-, 16-, 18-related external genital warts,penile/perineal/perianal intraepithelial neoplasia (PIN) grades 1/2/3, and persistent infection.
The efficacy of Gardasil in 16- through 26 year-old men was assessed in 1 placebo-controlled, double-blind, randomised Phase III clinical study (Protocol 020) including a total of 4,055 men who wereenrolled and vaccinated without pre-screening for the presence of HPV infection. The median durationof follow-up was 2.9 years.
In a subset of 598 men (GARDASIL = 299; placebo = 299) in Protocol 020 who self-identified ashaving sex with men (MSM) efficacy against anal intraepithelial neoplasia (AIN grades 1/2/3) andanal cancer, and intra-anal persistent infection was evaluated.
MSM are at higher risk of anal HPV infection compared to the general population; the absolute benefitof vaccination in terms of prevention of anal cancer in the general population is expected to be verylow.
HIV infection was an exclusion criterion (see section 4.4).
Efficacy in Men naïve to the relevant vaccine HPV types
The primary analyses of efficacy, with respect to vaccine HPV types (HPV 6, 11, 16, 18), wereconducted in the per-protocol efficacy (PPE) population (i.e., all 3 vaccinations within 1 year ofenrolment, no major protocol deviations and naïve to the relevant HPV type(s) prior to dose 1 andthrough 1 month Postdose 3 (Month 7)). Efficacy was measured starting after the Month 7 visit.
Overall, 83 % of men (87 % of heterosexual subjects and 61 % of MSM subjects) were naïve (PCRnegative and seronegative) to all 4 HPV types at enrolment.
Anal Intraepithelial Neoplasia (AIN) Grade 2/3 (moderate to high-grade dysplasia) was used in theclinical trials as a surrogate marker for anal cancer.
The efficacy results for relevant endpoints analysed at end of study (median duration of follow-up2.4 years) in the per-protocol population are presented in the Table 5. Efficacy against PIN grades1/2/3 was not demonstrated.
Table 5: Efficacy of Gardasil against external genital lesions in the PPE* population of 16-26 yearold men
Gardasil Placebo % Efficacy (95 %CI)
Endpoint N Number of N Number ofcases cases
HPV 6/11/16/18-related external genital lesions
External genital lesions 1394 3 1404 32 90.6 (70.1. 98.2)
Genital warts 1394 3 1404 28 89.3 (65.3, 97.9)
PIN1/2/3 1394 0 1404 4 100.0 (-52.1, 100.0)
*The individuals in the PPE population received all 3 vaccinations within 1 year of enrolment, had no majorprotocol deviations, and were naïve to the relevant HPV type(s) prior to dose 1 and through 1 month Postdose 3(Month 7).
At end of study analysis for anal lesions in the MSM population (median duration of follow-up was2.15 years), the preventive effect against HPV 6-, 11-, 16-, 18-related AIN 2/3 was 74.9 % (95 % CI:8.8, 95.4; 3/194 versus 13/208) and against HPV 16- or 18-related AIN 2/3 86.6 % (95 % CI: 0.0,99.7; 1/194 versus 8/208).
The duration of protection against anal cancer is currently unknown. In the long-term extension studyof Protocol 020, 917 men 16-26 years old during vaccination with Gardasil in the base study werefollowed. In the PPE population, no cases of HPV types 6/11 related genital warts, HPV 6/11/16/18external genital lesions or HPV 6/11/16/18 high grade AIN in MSM were observed through 11.5 years(median follow-up of 9.5 years).
Efficacy in men with or without prior infection or disease due to HPV 6, 11, 16, or 18
The Full Analysis Set population included men regardless of baseline HPV status at Day 1, whoreceived at least one vaccination and in whom case counting started at Day 1. This populationapproximates to the general population of men with respect to prevalence of HPV infection or diseaseat enrolment.
The efficacy of GARDASIL against HPV 6-, 11-, 16-, 18-related external genital warts was 68.1 %(95 % CI: 48.8, 79.3).
The efficacy of GARDASIL against HPV 6-, 11-, 16-, 18-related AIN 2/3 and HPV 16- or 18-related
AIN 2/3, in the MSM substudy, was 54.2 % (95 % CI: 18.0, 75.3; 18/275 versus 39/276) and 57.5 %(95 % CI: -1.8, 83.9; 8/275 versus 19/276 cases), respectively.
Protection Against the Overall Burden of HPV disease in 16- Through 26-Year-Old Men
The impact of Gardasil against the overall risk for external genital lesions was evaluated after the firstdose in 2,545 individuals enrolled in the Phase III efficacy trial (Protocol 020). Among men who werenaïve to 14 common HPV types, administration of Gardasil reduced the incidence of external genitallesions caused by vaccine- or non-vaccine HPV types by 81.5 % (95 % CI: 58.0, 93.0). In the Full
Analysis Set (FAS) population, the benefit of the vaccine with respect to the overall incidence of EGLwas lower, with a reduction of 59.3 % (95 % CI: 40.0, 72.9), as Gardasil does not impact the course ofinfections or disease that are present at vaccination onset.
Impact on Biopsy and Definitive Therapy Procedures
The impact of Gardasil on rates of biopsy and treatment of EGL regardless of causal HPV types wasevaluated in 2,545 individuals enrolled in Protocol 020. In the HPV naïve population (naïve to 14common HPV types), Gardasil reduced the proportion of men who had a biopsy by 54.2 % (95 % CI:28.3, 71.4) and who were treated by 47.7 % (95 % CI: 18.4, 67.1) at end of study. In the FASpopulation, the corresponding reduction was 45.7 % (95 % CI: 29.0, 58.7) and 38.1 % (95 % CI: 19.4,52.6).
ImmunogenicityAssays to Measure Immune Response
No minimum antibody level associated with protection has been identified for HPV vaccines.
The immunogenicity of Gardasil was assessed in 20,132 (Gardasil n = 10,723; placebo n = 9,409) girlsand women 9 to 26 years of age, 5,417 (Gardasil n = 3,109; placebo n = 2,308) boys and men 9 to26 years of age and 3,819 women 24 to 45 years of age (Gardasil n = 1,911, placebo n = 1,908).
Type-specific immunoassays, competitive Luminex-based immunoassay (cLIA), with type-specificstandards were used to assess immunogenicity to each vaccine type. This assay measures antibodiesagainst a single neutralizing epitope for each individual HPV type.
Immune Responses to Gardasil at 1 month post dose 3
In the clinical studies in women 16 to 26 years of age, 99.8 %, 99.8 %, 99.8 %, and 99.5 % ofindividuals who received Gardasil became anti-HPV 6, anti-HPV 11, anti-HPV 16, and anti-HPV 18-seropositive, respectively, by 1 month Postdose 3. In the clinical study in women 24 to 45 years,98.4 %, 98.1 %, 98.8 %, and 97.4 % of individuals who received Gardasil became anti-HPV 6, anti-
HPV 11, anti-HPV 16, and anti-HPV 18 seropositive, respectively, by 1 month Postdose 3. In theclinical study in men 16 to 26 years, 98.9 %, 99.2 %, 98.8 %, and 97.4 % of individuals who received
Gardasil became anti-HPV 6, anti-HPV 11, anti-HPV 16, and anti-HPV 18 seropositive, respectively,by 1 month Postdose 3. Gardasil induced high anti-HPV Geometric Mean Titres (GMTs) 1 month
Postdose 3 in all age groups tested.
As expected for women 24 to 45 years of age (Protocol 019), the observed antibody titres were lowerthan that seen in women 16 to 26 years.
Anti-HPV levels in placebo individuals who had cleared an HPV infection (seropositive and PCRnegative) were substantially lower than those induced by the vaccine. Furthermore, anti-HPV levels(GMTs) in vaccinated individuals remained at or above serostatus cut-off during the long-term follow-up of the Phase III studies (see below under Persistence of Immune Response of Gardasil).
Bridging the Efficacy of Gardasil from Women to Girls
A clinical study (Protocol 016) compared the immunogenicity of Gardasil in 10- to 15-year-old girls tothose in 16- to 23 year old women. In the vaccine group, 99.1 to 100 % became seropositive to allvaccine serotypes by 1 month Postdose 3.
Table 6 compares the 1 month Postdose 3 anti-HPV 6, 11, 16, and 18 GMTs in 9- to 15 year-old girlswith those in 16- to 26-year old women.
Table 6: Immunogenicity bridging between 9- to 15-year-old girls and 16- to 26-year-old women (per-protocol population) based on titres as measured by cLIA9- to 15-Year-Old Girls 16- to 26-Year-Old Women(Protocols 016 and 018) (Protocols 013 and 015)n GMT (95 % CI) n GMT (95 % CI)
HPV 6 915 929 (874, 987) 2631 543 (526, 560)
HPV 11 915 1303 (1223, 1388) 2655 762 (735, 789)
HPV 16 913 4909 (4548, 5300) 2570 2294 (2185, 2408)
HPV 18 920 1040 (965, 1120) 2796 462 (444, 480)
GMT- Geometric mean titre in mMU/ml (mMU = milli-Merck units)
Anti-HPV responses at Month 7 among 9- to 15-year-old girls were non-inferior to anti-HPVresponses in 16- to 26-year-old women for whom efficacy was established in the Phase III studies.
Immunogenicity was related to age and Month 7 anti-HPV levels were significantly higher in youngerindividuals below 12 years of age than in those above that age.
On the basis of this immunogenicity bridging, the efficacy of Gardasil in 9- to 15-year-old girls isinferred.
In the long-term extension study of Protocol 018, 369 girls 9-15 years old during vaccination with
Gardasil in the base study were followed. In the PPE population, no cases of HPV diseases (HPVtypes 6/11/16/18 related CIN any grade and Genital Warts) were observed through 10.7 years (medianfollow-up of 10.0 years).
Bridging the Efficacy of Gardasil from Men to Boys
Three clinical studies (Protocols 016, 018 and 020) were used to compare the immunogenicity of
Gardasil in 9- to 15-year-old boys to 16- to 26-year-old men. In the vaccine group, 97.4 to 99.9 %became seropositive to all vaccine serotypes by 1 month Postdose 3.
Table 7 compares the 1 month Postdose 3 anti-HPV 6, 11, 16, and 18 GMTs in 9- to 15-year-old boyswith those in 16- to 26-year-old men.
Table 7: Immunogenicity bridging between 9- to 15-year-old boys and 16- to 26-year-old men (per-protocol population) based on titres as measured by cLIA9- to 15-Year-Old Boys 16- to 26-Year-Old Menn GMT (95 % CI) n GMT (95 % CI)
HPV 6 884 1038 (964, 1117) 1093 448 (419, 479)
HPV 11 885 1387 (1299, 1481) 1093 624 (588, 662)
HPV 16 882 6057 (5601, 6549) 1136 2403 (2243, 2575)
HPV 18 887 1357 (1249, 1475) 1175 403 (375, 433)
GMT- Geometric mean titre in mMU/ml (mMU = milli-Merck units)
Anti-HPV responses at Month 7 among 9- to 15-year-old boys were non-inferior to anti-HPVresponses in 16- to 26-year-old men for whom efficacy was established in the Phase III studies.
Immunogenicity was related to age and Month 7 anti-HPV levels were significantly higher in youngerindividuals.
On the basis of this immunogenicity bridging, the efficacy of Gardasil in 9- to 15-year-old boys isinferred.
In the long-term extension study of Protocol 018, 326 boys 9-15 years old during vaccination with
Gardasil in the base study were followed. In the PPE population, no cases of HPV diseases (HPVtypes 6/11/16/18 related External Genital Lesions) were observed through 10.6 years (median follow-up of 9.9 years).
Persistence of Immune Response of Gardasil
A subset of individuals enrolled in the Phase III studies was followed up for a long-term period forsafety, immunogenicity and effectiveness. Total IgG Luminex Immunoassay (IgG LIA) was used toassess the persistence of immune response in addition to cLIA.
In all populations (women 9 - 45 years, men 9 - 26 years), peak anti-HPV 6, anti-HPV 11, anti-
HPV 16, and anti-HPV 18 GMTs cLIA were observed at Month 7. Afterwards, the GMTs declinedthrough Month 24 - 48 and then generally stabilised. The duration of immunity following a 3-doseseries has been observed for up to 14 years post-vaccination.
Girls and boys vaccinated with Gardasil at 9-15 years of age in Protocol 018 base study were followedup in an extension study. Depending on HPV type, 60-96 % and 78-98 % of subjects were seropositiveby cLIA and IgG LIA respectively 10 years after vaccination (see Table 8).
Table 8: Long-term immunogenicity data (per-protocol population) based on percentage ofseropositive subjects as measured by cLIA and IgG LIA (Protocol 018) at 10 years, in girls and boys9-15 years of agecLIA IgG LIAn % of seropositive n % of seropositive subjectssubjects
HPV 6 409 89 % 430 93 %
HPV 11 409 89 % 430 90 %
HPV 16 403 96 % 426 98 %
HPV 18 408 60 % 429 78 %
Women vaccinated with Gardasil at 16-23 years of age in Protocol 015 base were followed up in anextension study. Fourteen years after vaccination, 91 %, 91 %, 98 % and 52 % were anti-HPV 6, anti-
HPV 11, anti-HPV 16 and anti-HPV 18 seropositive in the cLIA, respectively, and 98 %, 98 %, 100 %and 94 % were anti-HPV 6, anti-HPV 11, anti-HPV 16 and anti-HPV 18 seropositive in the IgG LIA,respectively.
Women vaccinated with Gardasil at 24-45 years of age in Protocol 019 base study were followed up inan extension study. Ten years after vaccination, 79 %, 85 %, 94 %, and 36 % were anti-HPV 6, anti-
HPV 11, anti-HPV 16 and anti-HPV 18 seropositive in the cLIA, respectively, and 86 %, 79 %, 100 %and 83 % were anti-HPV 6, anti-HPV 11, anti-HPV 16 and anti-HPV 18 seropositive in the IgG LIA,respectively.
Men vaccinated with Gardasil at 16-26 years of age in Protocol 020 base study were followed up in anextension study. Ten years after vaccination, 79 %, 80 %, 95 % and 40 % were anti-HPV 6, anti-
HPV 11, anti-HPV 16 and anti-HPV 18 seropositive in the cLIA, respectively, and 92 %, 92 %, 100 %and 92 % were anti-HPV 6, anti-HPV 11, anti-HPV 16 and anti-HPV 18 seropositive in the IgG LIA,respectively.
In these studies, individuals who were seronegative for anti-HPV 6, anti-HPV 11, anti-HPV 16, andanti-HPV 18 in the cLIA were still protected against clinical disease after a follow-up of 14 years for16-23 year-old women, 10 years for 24-45 year-old women, and 10 years for 16-26 year-old men.
Evidence of Anamnestic (Immune Memory) Response
Evidence of an anamnestic response was seen in vaccinated women who were seropositive to relevant
HPV type(s) prior to vaccination. In addition, a subset of vaccinated women who received a challengedose of Gardasil 5 years after the onset of vaccination, exhibited a rapid and strong anamnesticresponse that exceeded the anti-HPV GMTs observed 1 month Postdose 3.
HIV infected subjects
An academic study documenting safety and immunogenicity of Gardasil has been performed in 126
HIV infected subjects aged from 7-12 years (of which 96 received Gardasil). Seroconversion to allfour antigens occurred in more than ninety-six percent of the subjects. The GMTs were somewhatlower than reported in non-HIV infected subjects of the same age in other studies. The clinicalrelevance of the lower response is unknown. The safety profile was similar to non-HIV infectedsubjects in other studies. The CD4 % or plasma HIV RNA was not affected by vaccination.
Immune Responses to Gardasil using a 2-dose schedule in individuals 9-13 years of age
A clinical trial showed that among girls who received 2 doses of HPV vaccine 6 months apart,antibody responses to the 4 HPV types, one month after the last dose were non-inferior to those amongyoung women who received 3 doses of the vaccine within 6 months.
At Month 7, in the Per Protocol population, the immune response in girls aged 9-13 years (n = 241)who received 2 doses of Gardasil (at 0, 6 months) was non-inferior and numerically higher to theimmune response in women aged 16-26 years (n = 246) who received 3 doses of Gardasil (at 0, 2,6 months).
At 36 month follow-up, the GMT in girls (2 doses, n = 86) remained non-inferior to the GMT inwomen (3 doses, n = 86) for all 4 HPV types.
In the same study, in girls aged 9-13 years, the immune response after a 2-dose schedule wasnumerically lower than after a 3-dose schedule (n = 248 at Month 7; n = 82 at Month 36). The clinicalrelevance of these findings is unknown.
Post hoc analyses were conducted at 120-month follow-up in girls (2 doses, n = 35; 3 doses, n = 38)and women (3 doses, n = 30). The GMT ratios (girls who received 2 doses/women who received 3doses) ranged from 0.99 to 2.02 for all 4 HPV types. The GMT ratios (girls who received 2 doses /girls who received 3 doses) ranged from 0.72 to 1.21 for all 4 HPV types. The lower bound of the95 % CI of all the GMT ratios remained > 0.5 through month 120 (except for HPV 18 in girls whoreceived 2 doses/girls who received 3 doses).
Seropositivity rates in girls and women were > 95 % for HPV 6, 11, and 16, and seropositivity ratesfor HPV 18 were > 80 % in girls who received.2 doses, > 90 % in girls who received 3 doses, and> 60 % in women who received 3 doses, in the cLIA.
Prevention of juvenile-onset recurrent respiratory papillomatosis (JoRRP) by vaccination of girls andwomen of childbearing potential
JoRRP is caused by upper airway infection primarily with HPV types 6 and 11, acquired vertically(mother-to-child) during childbirth. Observational studies in the US and Australia have shown that theintroduction of Gardasil since 2006 has led to declines in the incidence of JoRRP at population level.