A Phase III Study of a 2-dose Regimen of a Multivalent Human Papillomavirus (HPV) Vaccine (V503), Administered to 9 to 14 Year-olds and Compared to Young Women, 16 to 26 Years Old (V503-010)
CompletedPhase 3Results postedLast updated 8 August 2018
What this trial tests
Phase 3 trial testing V503 (9-valent Human Papillomavirus [HPV] L1 Virus-Like Particle [VLP] vaccine) in Human Papillomavirus Infection in 1,518 participants. Completed in 24 July 2017.
Adults 9 to 26, any sex, with Human Papillomavirus Infection. Patients with the condition only — healthy volunteers not accepted.
Results — posted to ClinicalTrials.gov
Per-arm endpoint measurements with 95% confidence intervals where reported. Source: trial results section.
Geometric Mean Titers to Human Papillomavirus (HPV) Type 6 After the Last Dose of V503 in the Planned RegimenPrimary· 4 weeks after the last dose of V503 in the planned regimen (Month 7 or Month 13)
Antibodies to HPV virus-like particles (VLP) type 6 were measured using a competitive Luminex immunoassay. Antibody titers were expressed as milli Merck units/mL (mMU/mL).
Group
Value
95% CI
Girls 9 to 14 Years V503 at Months 0 and 6
1657.9
1479.6 – 1857.6
Boys 9 to 14 Years V503 at Months 0 and 6
1557.4
1391.5 – 1743.1
Girls and Boys 9 to 14 Years V503 at Months 0 and 12
2678.8
2390.2 – 3002.1
Girls 9 to 14 Years V503 at Months 0, 2, and 6
1496.1
1334.1 – 1677.8
Young Women 16 to 26 Years V503 at Months 0, 2, and 6
770.9
684.8 – 867.9
Percentage of Participants With Seroconversion to HPV Type 6 at Four Weeks After the Last Dose of V503 in the Planned RegimenSecondary· 4 weeks after the last dose of V503 in the planned regimen (Month 7 or Month 13)
Antibodies to HPV VLP type 6 were measured using a competitive Luminex immunoassay. Seroconversion to HPV type 6 was defined as a titer \>=30 mMU/mL.
Group
Value
95% CI
Girls 9 to 14 Years V503 at Months 0 and 6
99.6
97.9 – 100
Boys 9 to 14 Years V503 at Months 0 and 6
100
98.6 – 100
Girls and Boys 9 to 14 Years V503 at Months 0 and 12
100
98.6 – 100
Girls 9 to 14 Years V503 at Months 0, 2, and 6
99.2
97.2 – 99.9
Young Women 16 to 26 Years V503 at Months 0, 2, and 6
99.6
97.7 – 100
Geometric Mean Titers to HPV Type 11 at Four Weeks After the Last Dose of V503 in the Planned RegimenPrimary· 4 weeks after the last dose of V503 in the planned regimen (Month 7 or Month 13)
Antibodies to HPV VLP type 11 were measured using a competitive Luminex immunoassay. Antibody titers were expressed as milli Merck units/mL (mMU/mL).
Group
Value
95% CI
Girls 9 to 14 Years V503 at Months 0 and 6
1388.9
1240.4 – 1555.3
Boys 9 to 14 Years V503 at Months 0 and 6
1423.9
1273.2 – 1592.3
Girls and Boys 9 to 14 Years V503 at Months 0 and 12
2941.8
2626.6 – 3294.9
Girls 9 to 14 Years V503 at Months 0, 2, and 6
1306.3
1165.5 – 1464.0
Young Women 16 to 26 Years V503 at Months 0, 2, and 6
580.5
516.0 – 653.0
Geometric Mean Titers to HPV Type 16 at Four Weeks After the Last Dose of V503 in the Planned RegimenPrimary· 4 weeks after the last dose of V503 in the planned regimen (Month 7 or Month 13)
Antibodies to HPV VLP type 16 were measured using a competitive Luminex immunoassay. Antibody titers were expressed as milli Merck units/mL (mMU/mL).
Group
Value
95% CI
Girls 9 to 14 Years V503 at Months 0 and 6
8004.9
7160.5 – 8948.8
Boys 9 to 14 Years V503 at Months 0 and 6
8474.8
7582.4 – 9472.3
Girls and Boys 9 to 14 Years V503 at Months 0 and 12
14329.3
12796.4 – 16045.9
Girls 9 to 14 Years V503 at Months 0, 2, and 6
6996.0
6254.1 – 7825.8
Young Women 16 to 26 Years V503 at Months 0, 2, and 6
3154.0
2807.1 – 3543.7
Geometric Mean Titers to HPV Type 18 at Four Weeks After the Last Dose of V503 in the Planned RegimenPrimary· 4 weeks after the last dose of V503 in the planned regimen (Month 7 or Month 13)
Antibodies to HPV VLP type 18 were measured using a competitive Luminex immunoassay. Antibody titers were expressed as milli Merck units/mL (mMU/mL).
Group
Value
95% CI
Girls 9 to 14 Years V503 at Months 0 and 6
1872.8
1651.6 – 2123.6
Boys 9 to 14 Years V503 at Months 0 and 6
1860.9
1641.1 – 2110.2
Girls and Boys 9 to 14 Years V503 at Months 0 and 12
2810.4
2474.9 – 3191.3
Girls 9 to 14 Years V503 at Months 0, 2, and 6
2049.3
1806.4 – 2324.8
Young Women 16 to 26 Years V503 at Months 0, 2, and 6
761.5
670.8 – 864.5
Geometric Mean Titers to HPV Type 31 at Four Weeks After the Last Dose of V503 in the Planned RegimenPrimary· 4 weeks after the last dose of V503 in the planned regimen (Month 7 or Month 13)
Antibodies to HPV VLP type 31 were measured using a competitive Luminex immunoassay. Antibody titers were expressed as milli Merck units/mL (mMU/mL).
Group
Value
95% CI
Girls 9 to 14 Years V503 at Months 0 and 6
1436.3
1272.1 – 1621.8
Boys 9 to 14 Years V503 at Months 0 and 6
1498.2
1326.5 – 1692.0
Girls and Boys 9 to 14 Years V503 at Months 0 and 12
2117.5
1873.7 – 2393.1
Girls 9 to 14 Years V503 at Months 0, 2, and 6
1748.3
1548.1 – 1974.5
Young Women 16 to 26 Years V503 at Months 0, 2, and 6
572.1
505.8 – 647.2
Geometric Mean Titers to HPV Type 33 at Four Weeks After the Last Dose of V503 in the Planned RegimenPrimary· 4 weeks after the last dose of V503 in the planned regimen (Month 7 or Month 13)
Antibodies to HPV VLP type 33 were measured using a competitive Luminex immunoassay. Antibody titers were expressed as milli Merck units/mL (mMU/mL).
Group
Value
95% CI
Girls 9 to 14 Years V503 at Months 0 and 6
1030.0
920.4 – 1152.7
Boys 9 to 14 Years V503 at Months 0 and 6
1040.0
928.9 – 1164.3
Girls and Boys 9 to 14 Years V503 at Months 0 and 12
2197.5
1961.9 – 2461.3
Girls 9 to 14 Years V503 at Months 0, 2, and 6
796.4
712.0 – 890.9
Young Women 16 to 26 Years V503 at Months 0, 2, and 6
348.1
311.5 – 389.1
Geometric Mean Titers to HPV Type 45 at Four Weeks After the Last Dose of V503 in the Planned RegimenPrimary· 4 weeks after the last dose of V503 in the planned regimen (Month 7 or Month 13)
Antibodies to HPV VLP type 45 were measured using a competitive Luminex immunoassay. Antibody titers were expressed as milli Merck units/mL (mMU/mL).
Group
Value
95% CI
Girls 9 to 14 Years V503 at Months 0 and 6
357.6
313.7 – 407.6
Boys 9 to 14 Years V503 at Months 0 and 6
352.3
309.0 – 401.7
Girls and Boys 9 to 14 Years V503 at Months 0 and 12
417.7
365.9 – 476.9
Girls 9 to 14 Years V503 at Months 0, 2, and 6
661.7
580.6 – 754.1
Young Women 16 to 26 Years V503 at Months 0, 2, and 6
213.6
187.7 – 243.2
Geometric Mean Titers to HPV Type 52 at Four Weeks After the Last Dose of V503 in the Planned RegimenPrimary· 4 weeks after the last dose of V503 in the planned regimen (Month 7 or Month 13)
Antibodies to HPV VLP type 52 were measured using a competitive Luminex immunoassay. Antibody titers were expressed as milli Merck units/mL (mMU/mL).
Group
Value
95% CI
Girls 9 to 14 Years V503 at Months 0 and 6
581.1
521.9 – 647.1
Boys 9 to 14 Years V503 at Months 0 and 6
640.4
575.2 – 713.0
Girls and Boys 9 to 14 Years V503 at Months 0 and 12
1123.4
1008.1 – 1251.9
Girls 9 to 14 Years V503 at Months 0, 2, and 6
909.9
817.6 – 1012.5
Young Women 16 to 26 Years V503 at Months 0, 2, and 6
364.2
327.0 – 405.6
Geometric Mean Titers to HPV Type 58 at Four Weeks After the Last Dose of V503 in the Planned RegimenPrimary· 4 weeks after the last dose of V503 in the planned regimen (Month 7 or Month 13)
Antibodies to HPV VLP type 58 were measured using a competitive Luminex immunoassay. Antibody titers were expressed as milli Merck units/mL (mMU/mL).
Group
Value
95% CI
Girls 9 to 14 Years V503 at Months 0 and 6
1251.2
1119.6 – 1398.4
Boys 9 to 14 Years V503 at Months 0 and 6
1325.7
1186.2 – 1481.6
Girls and Boys 9 to 14 Years V503 at Months 0 and 12
2444.6
2185.2 – 2734.9
Girls 9 to 14 Years V503 at Months 0, 2, and 6
1229.3
1100.7 – 1373.0
Young Women 16 to 26 Years V503 at Months 0, 2, and 6
491.1
438.6 – 549.8
Percentage of Participants With Seroconversion to HPV Type 11 at Four Weeks After the Last Dose of V503 in the Planned RegimenSecondary· 4 weeks after the last dose of V503 in the planned regimen (Month 7 or Month 13)
Antibodies to HPV VLP type 11 were measured using a competitive Luminex immunoassay. Seroconversion to HPV type 11 was defined as a titer \>=16 mMU/mL.
Group
Value
95% CI
Girls 9 to 14 Years V503 at Months 0 and 6
100
98.6 – 100
Boys 9 to 14 Years V503 at Months 0 and 6
100
98.6 – 100
Girls and Boys 9 to 14 Years V503 at Months 0 and 12
100
98.6 – 100
Girls 9 to 14 Years V503 at Months 0, 2, and 6
99.6
97.8 – 100
Young Women 16 to 26 Years V503 at Months 0, 2, and 6
99.6
97.7 – 100
Percentage of Participants With Seroconversion to HPV Type 16 at Four Weeks After the Last Dose of V503 in the Planned RegimenSecondary· 4 weeks after the last dose of V503 in the planned regimen (Month 7 or Month 13)
Antibodies to HPV VLP type 16 were measured using a competitive Luminex immunoassay. Seroconversion to HPV type 16 was defined as a titer \>=20 mMU/mL.
Group
Value
95% CI
Girls 9 to 14 Years V503 at Months 0 and 6
100
98.7 – 100
Boys 9 to 14 Years V503 at Months 0 and 6
100
98.7 – 100
Girls and Boys 9 to 14 Years V503 at Months 0 and 12
100
98.6 – 100
Girls 9 to 14 Years V503 at Months 0, 2, and 6
100
98.6 – 100
Young Women 16 to 26 Years V503 at Months 0, 2, and 6
99.6
97.8 – 100
Adverse events — posted to ClinicalTrials.gov
Time frame: Serious Adverse Events: Up to Month 37; Non-injection site adverse events: up to Day 15 following any vaccination; Injection site adverse events: up to Day 5 following any vaccination.
Reporting threshold: 5%.
Adverse-event reports describe events observed during the trial — not all are caused by the drug.
Girls 9 to 14 Years V503 at Months 0 and 6
Serious: 6/294 (2%)
Deaths: 0/294
Boys 9 to 14 Years V503 at Months 0 and 6
Serious: 9/296 (3%)
Deaths: 0/296
Girls and Boys 9 to 14 Years V503 at Months 0 and 12
Serious: 6/293 (2%)
Deaths: 0/293
Girls 9 to 14 Years V503 at Months 0, 2, and 6
Serious: 6/300 (2%)
Deaths: 1/300
Young Women 16 to 26 Years V503 at Months 0, 2, and 6
This was a 37-month safety and immunogenicity study conducted in boys and girls 9 to 14 years of age and in young women 16 to 26 years of age. From this study, the goal was to establish that the investigational 2-dose regimens (0, 6 months and 0, 12 months) studied in boys and girls 9 to 14 years of age are generally safe and immunogenic, with an antibody response that is not inferior to that observed in young women 16 to 26 years of age who received the standard 3-dose regimen of V503 (i.e., the population and dose regimen used to establish V503 efficacy).
Publications & conference data
8 peer-reviewed publications reference this trial (live from Europe PMC):
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Publications: Europe PMC API search by NCT ID, retrieved 10 June 2026
Drug + disease cross-links: matched in real time against Drug Landscape's normalised drug + company + condition tables
Sponsor: as reported to ClinicalTrials.gov by Merck Sharp & Dohme LLC
Last refreshed: 8 August 2018
Drug Landscape aggregates and links these public records for informational use only. Always verify against the primary source before clinical or regulatory decisions. Canonical URL: https://druglandscape.com/trial/NCT01984697.