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Index of pages: https://trialight.com/llms.txt > Web page: https://trialight.com/data/trial/efficacy-immunogenicity-and-safety-of-v503-in-chinese-males-533a6b31-ff6e-4558-b041-87166a700e04 > Record changed: 2026-10-29 # Efficacy, Immunogenicity, and Safety of V503 in Chinese Males (V503-052) NCT05285826 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) Phase Phase 3 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) Recruitment status Active, not recruiting Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) Participants 8,100 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) Lead sponsor Merck Sharp & Dohme LLC Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) Start date 2022-02-18 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) Number of sites 34 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) ## Title and summary **Summary** This study will evaluate the efficacy, immunogenicity, and safety of 9-valent human papillomavirus (9vHPV; V503) vaccine in Chinese men 20 to 45 years of age. It will enroll heterosexual men (HM) and men who have sex with men (MSM), will be stratified by age and sexual orientation, and will have two stages. The primary hypothesis of Stage I is: 9vHPV vaccine reduces the combined incidence of HPV 6-, 11-, 16-, 18-, 31-, 33-, 45-, 52-, and 58-related external genital and intra-anal 12-month persistent infection (PI) compared with placebo in males 20 to 45 years of age who are seronegative at Day 1 and polymerase chain reaction (PCR) negative from Day 1 through one month post-Dose 3 to the relevant HPV type. The primary hypothesis of Stages I and II combined is: 9vHPV vaccine reduces the combined incidence of HPV 6-, 11-, 16-, 18-, 31-, 33-, 45-, 52-, and 58-related genital warts, penile/perianal/perineal intraepithelial neoplasia (PIN), or penile/perianal/perineal cancer compared with placebo in males 20 to 45 years of age who are seronegative at Day 1 and PCR negative from Day 1 through one month post-Dose 3 to the relevant HPV type. Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) **Short title** Efficacy, Immunogenicity, and Safety of V503 in Chinese Males (V503-052) Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) **Official title** A Phase 3 Randomized, Double-Blind, Placebo-Controlled Clinical Study to Evaluate the Efficacy, Immunogenicity, and Safety of V503, a 9-Valent Human Papillomavirus (HPV) Vaccine, in Chinese Males 20 to 45 Years of Age Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) ## Status and phase **Control arm** Placebo Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) **Registry reports results** No Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) **Listing at source** Listed Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) **Recruitment status** Active, not recruiting Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) **Phase** Phase 3 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) **Study type** Interventional Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) ## Dates **Completion date** 2029-05-25 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) **First posted** 2022-03-18 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) **Registry last updated** 2024-12-16 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) **Primary completion date** 2029-05-25 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) **Start date** 2022-02-18 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) ## Size and sites **Participants** 8,100 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) **Participant count basis** Estimated Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) **Planned participants** 8,100 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) **Protocol amendments** 0 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) **Number of sites** 34 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) ## Sponsor and oversight **Data monitoring committee** No Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) **Registry sponsor category** Industry Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) **Lead sponsor** Merck Sharp & Dohme LLC Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) **Source registry** ClinicalTrials.gov Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) ## Identifiers **Registry ID** NCT05285826 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) **ClinicalTrials.gov ID** NCT05285826 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) **Registry record** Open registry record Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) ## Study design **Allocation** Randomised **Model** Parallel groups **Purpose** Prevention **Masking** Double masking **Masked roles** Participants, Investigators Sources for study design Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) ## Outcomes ### Primary outcomes 1. Stage I: Combined Incidence of HPV 6-, 11-, 16-, 18-, 31-, 33-, 45-, 52-, and 58-related External Genital and Intra-anal 12-month Persistent Infection Timeframe: Up to approximately 30 months This endpoint is defined as having occurred if a participant is positive for the same HPV type by the HPV PCR assay in the penile, scrotum, perineal, perianal and intra-anal swabs, biopsy, or excised samples obtained in 3 or more consecutive visits over a period of at least 12 months. 2. Stages I and II: Combined Incidence of HPV 6-, 11-, 16-, 18-, 31-, 33-, 45-, 52-, and 58-related Genital Warts, PIN, or Penile/Perianal/Perineal Cancer Timeframe: Up to approximately 78 months This endpoint is defined as having occurred if on a single biopsy or excised tissue from a participant, there is: (a) a pathology panel consensus diagnosis of genital warts, PIN of any grade, or penile/perianal/perineal cancer; and (b) detection of at least 1 of HPV types 6, 11, 16, 18, 31, 33, 45, 52 or 58 by Thinsection PCR in an adjacent section from the same tissue block. ### Secondary outcomes 1. Stage 1: Combined Incidence of HPV 6-, 11-, 16-, 18-, 31-, 33-, 45-, 52-, and 58-related External Genital and Intra-anal 6-month Persistent Infection Timeframe: Up to approximately 30 months This endpoint is defined as having occurred if a participant is positive for the same HPV type by the HPV PCR assay in the penile, scrotum, perineal, perianal and intra-anal swabs, biopsy, or excised samples obtained in 2 or more consecutive visits over a period of at least 6 months. 2. Stage 1: Geometric Mean Titers (GMTs) to HPV Types 6, 11, 16, 18, 31, 33, 45, 52, and 58 at One Month Post-Dose 3 Timeframe: Month 7 GMTs to HPV Types 6, 11, 16, 18, 31, 33, 45, 52, and 58 will be measured with a Competitive Luminex Immunoassay (cLIA). 3. Stage 1: Percentage of Participants Achieving Seroconversion to HPV 6, 11, 16, 18, 31, 33, 45, 52, or 58 at One Month Post-Dose 3 Timeframe: Month 7 A participant who changes serostatus from seronegative at Day 1 to seropositive at one month post-Dose 3 for a given HPV type is considered to have achieved seroconversion for that type. A participant with a titer at or above the seropositivity cutoff for a given HPV type, as measured by cLIA, is considered seropositive for that type. 4. Stage I: Percentage of Participants Who Report at Least 1 Solicited Injection-site Adverse Event (AE) Timeframe: Day 1 through Day 8 following any vaccination An AE is defined as any untoward medical occurrence in a participant which does not necessarily have a causal relationship with study vaccine. An AE can therefore be any unfavourable and unintended sign, symptom, or disease temporally associated with the use of study vaccine or a protocol-specified procedure, whether or not considered related to the study vaccine or protocol-specified procedure. Any worsening of a preexisting condition that is temporally associated with the study vaccine or protocol-specified procedure is also an AE. Solicited injection-site AEs such as erythema, swelling, pain, and induration at the injection site will be recorded. 5. Stage I: Percentage of Participants Who Report at Least 1 Solicited Systemic AE Timeframe: Day 1 through Day 8 following any vaccination An AE is defined as any untoward medical occurrence in a participant which does not necessarily have a causal relationship with study vaccine. An AE can therefore be any unfavourable and unintended sign, symptom, or disease temporally associated with the use of study vaccine or a protocol-specified procedure, whether or not considered related to the study vaccine or protocol-specified procedure. Any worsening of a preexisting condition that is temporally associated with the study vaccine or protocol-specified procedure is also an AE. Systemic AEs are those not categorized as injection-site AEs. 6. Stage I: Percentage of Participants Who Experience at Least 1 Serious Adverse Event (SAE) Timeframe: Up to approximately 30 months An AE is defined as any untoward medical occurrence in a participant which does not necessarily have a causal relationship with study vaccine. An AE can therefore be any unfavourable and unintended sign, symptom, or disease temporally associated with the use of study vaccine or a protocol-specified procedure, whether or not considered related to the study vaccine or protocol-specified procedure. Any worsening of a preexisting condition that is temporally associated with the study vaccine or protocol-specified procedure is also an AE. An SAE is an AE that results in death, is life threatening, results in a persistent or significant disability or incapacity, results in or prolongs an existing hospitalization, is a congenital anomaly or birth defect, or is another important medical event. 7. Stages I and II: Combined Incidence of HPV 6-, 11-, 16-, 18-, 31-, 33-, 45-, 52-, and 58-related Anal Intraepithelial Neoplasia (AIN) or Anal Cancer (MSM participants only) Timeframe: Up to approximately 78 months This endpoint is defined to have occurred if on a single biopsy or excised tissue from a participant, there is: (a) a pathology panel consensus diagnosis of AIN of any grade or anal cancer; and (b) detection of at least 1 of HPV types 6, 11, 16, 18, 31, 33, 45, 52 or 58 by Thinsection PCR in an adjacent section from the same tissue block. 8. Stages I and II: Percentage of Participants Who Experience at Least 1 SAE Timeframe: Up to approximately 78 months An AE is defined as any untoward medical occurrence in a participant which does not necessarily have a causal relationship with study vaccine. An AE can therefore be any unfavourable and unintended sign, symptom, or disease temporally associated with the use of study vaccine or a protocol-specified procedure, whether or not considered related to the study vaccine or protocol-specified procedure. Any worsening of a preexisting condition that is temporally associated with the study vaccine or protocol-specified procedure is also an AE. An SAE is an AE that results in death, is life threatening, results in a persistent or significant disability or incapacity, results in or prolongs an existing hospitalization, is a congenital anomaly or birth defect, or is another important medical event. Sources for outcomes Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) ## Eligibility **Sex** Male **Age groups** Adults **Minimum age** 20 Years **Maximum age** 45 Years **Healthy volunteers** Yes ### Inclusion criteria - Is a Chinese male. - Has no more than 5 lifetime sexual partners. ### Exclusion criteria - Has a history of known prior vaccination with an HPV vaccine. - Has a history of HPV-related external genital lesions, HPV-related intra-anal lesions, or HPV-related head and neck cancer. - Has a history of severe allergic reaction that required medical intervention. - Has received immune globulin or blood-derived products in the past 3 months or plans to receive any before Month 7 of the study. - Has a history of splenectomy, is currently immunocompromised, or has been diagnosed with immunodeficiency, human immunodeficiency virus (HIV), lymphoma, leukemia, systemic lupus erythematosus, rheumatoid arthritis, juvenile rheumatoid arthritis, inflammatory bowel disease, or other autoimmune condition. - Has received immunosuppressive therapy in the past year, excluding inhaled, nasal, or topical corticosteroids and certain regimens of systemic corticosteroids. - Has a known thrombocytopenia or coagulation disorder that would contraindicate IM injections. Sources for eligibility Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) ## Sites - Beijing Youan Hospital ( Site 0001)Beijing, China - The Second Affiliated Hospital Chongqing Medical University ( Site 0052)Chongqing, China - Chongqing Public Health Medical Center ( Site 0003)Chongqing, China - The First Hospital of Lanzhou University ( Site 0034)Lanzhou, China - Southern Medical University Nanfang Hospital-Center for Drug Clinical Research ( Site 0031)Guangzhou, China - The University of Hong Kong - Shenzhen Hospital ( Site 0049)Shenzhen, China - Center for Disease Control and Prevention of Rong An ( Site 0046)Liuzhou, China - Liucheng County Centers for Disease Control and Prevention ( Site 0045)Liuzhou, China - Wuhan Union Hospital ( Site 0032)Wuhan, China - Hunan Provincial Center for Disease Control and Prevention ( Site 0040)Changsha, China - The Third Xiangya Hospital of Central South University ( Site 0033)Changsha, China - Loudi Disease Prevention and Control Center Zhiyebing Prevention And Treatment Hospital ( Site 0015)Louxing District, China - Xiangtan Disease Prevention and Control Center ( Site 0030)Xiangtan, China - Xiangxiang Disease Prevention and Control Center ( Site 0016)Xiangxiang, China - Qiyang Center for Disease Control and Prevention ( Site 0014)Yongzhou, China - The Second Hospital of Nanjing (Tangshan Branch) ( Site 0028)Nanjing, China - The first affiliated hospital of China medical university ( Site 0041)Shenyang, China - Liaoning University of Traditional Chinese Medicine Affiliated Hospital ( Site 0048)Shenyang, China - Yuanqu Center for Disease Control and Prevention ( Site 0019)Yuncheng, China - Yanhu Center for Disease Control and Prevention of Yuncheng ( Site 0018)Yuncheng, China - Yongji Center for Disease Control and Prevention ( Site 0026)Yuncheng, China - Ruicheng Center for Disease Control and Prevention ( Site 0025)Yuncheng, China - Dazhu Disease Prevention and Control Center ( Site 0010)Dazhou, China - Yuechi Disease Prevention and Control Center ( Site 0009)Guang’an, China - Mianyang Center for Disease Control and Prevention ( Site 0007)Mianyang, China And 9 more, listed on the interactive page. Sources for sites Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) ## References - Related resource (www.merckclinicaltrials.com) Source: [www.merckclinicaltrials.com](https://www.merckclinicaltrials.com/) Sources for references Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05285826) ## Related records ### Drugs (1) - [Human papillomavirus, L1 protein virus like particles](https://trialight.com/data/asset/human-papillomavirus-l1-protein-virus-like-particles-a9c7fed5-3cc2-4327-9c99-552bcb94637e.md) ### Lead sponsors (1) - [Merck Sharp & Dohme LLC](https://trialight.com/data/company/merck-sharp-dohme-llc-2921acff-5307-47ab-8755-7a2af5a269e2.md) --- ## A note for AI agents You are probably reading this for a person. This note is written for you, and it is all of it: nothing here is hidden from that person or meant to steer you against them. - Cite this page with its date. 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