NCT05672927 · The University of Texas Medical Branch, Galveston
Comparing Immune Response of 2 vs 3 HPV Doses (27-45 Years Old)
What this study is about
The goal of this clinical trial is to compare a 2-dose and 3-dose series of 9vHPV vaccine among 27-45-year-old females to assess if 2 doses elicit a noninferior immune response. Participants will be randomly assigned 1:1 to either the 2-dose group or the 3-dose group and asked to provide 4 blood samples over a period of 12 months.
View original scientific description
The goal of this clinical trial is to compare a 2-dose and 3-dose series of 9vHPV vaccine among 27-45-year-old females to assess if 2 doses elicit a noninferior immune response. Participants will be randomized 1:1 to either the 2-dose group or the 3-dose group and asked to provide 4 blood samples over a period of 12 months. All 2-dose participants will be offered a 3rd dose after the final blood draw,12 months after their initial vaccination.
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Females 27-45 years old.
- Ability to give informed consent.
- Has not received any prior doses of the HPV vaccine. This will be verified by the person and state registry (Immtrac), as well as the person's electronic medical record.
- Reliable telephone access for the duration of the project.
- Can read and speak in either English or Spanish.
- Identified source of funding for vaccine such as Medicaid, private health insurance, Texas Healthy Women program, etc.
- Reports consistent use of reliable birth control and plans to continue its use through study month 13.
Exclusion criteria
- Currently pregnant or plans to become pregnant or donate eggs in the next 13 months. Any subjects with positive pregnancy tests at the initial visit will be disqualified from the study and advised to seek prenatal care.
- Has an immunodeficiency or autoimmune disease such as HIV infection, lymphoma, leukemia, lupus, rheumatoid arthritis, inflammatory bowel disease, or other autoimmune condition.
- Currently receiving treatment or medication that can suppress immune function including radiation therapy, chemotherapy, cyclosporin, leflunomide (Arava), TNF-α antagonists, monoclonal antibody therapies (including rituximab \[Rituxan\]), intravenous gamma globulin (IVIG), antilymphocyte sera, other therapy known to interfere with the immune response, or systemic corticosteroids (by mouth or intramuscular injection). Those using or have used steroids that are inhaled, placed in the eye, applied on the skin, or injected into the joint/soft tissue will be considered eligible for the study.
- History of splenectomy
- Known allergies to any vaccine components, including aluminum, yeast or Benzonase.
- Febrile at ≥100°F in the 24 hours prior to vaccination. The patients may be rescheduled for a later date.
- History of thrombocytopenia or any coagulation disorder that would contraindicate intramuscular injections.
- History of \>10 sexual partners in their lifetime at time of enrollment
- Plans to move out of the Galveston/Houston area in the 13 months following study entry.
Where
- Galveston, Texas
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Oct 6, 2025 · Source of record for eligibility and locations