New antibody shot could block HIV – first human safety test underway
NCT ID NCT06585891
First seen Jun 24, 2026 · Last updated Jun 27, 2026 · Updated 1 time
Summary
This early-stage trial tests the safety of a new antibody called CAP256J3LS in 24 healthy adults aged 18 to 60. The antibody is designed to target and neutralize HIV. Participants receive either one or three doses, given as a shot under the skin or through an IV. The study monitors side effects and how long the antibody stays in the body.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- CAP256J3LS (a bispecific antibody that targets HIV)
- What this could lead to
- If successful, this could pave the way for a new HIV prevention or treatment approach using antibodies instead of daily pills.
- What could go wrong
- This is an early Phase 1 safety trial with only 24 healthy participants, so it is too soon to know if the antibody will effectively prevent or treat HIV in real-world settings.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
-
Phase 1
The first testing in people. Mainly checks safety and dose, usually in a small group.
- Participants
-
24 people
The number who actually took part.
- Started
-
Oct 2024
- Finished
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Sep 2025
- Lead sponsor
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A government research agency
The lead sponsor is the US National Institutes of Health.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
-
18 to 60 years
- Sex
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Anyone
- Healthy volunteers
-
Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
* INCLUSION CRITERIA: A participant must meet all of the following criteria: 1. Willing and able to complete the informed consent process. 2. Able to provide proof of identity to the satisfaction of the study clinician completing the enrollment process. 3. Available for clinical follow-up through the last study visit. 4. 18 to 60 years of age. 5. In good general health without a clinically significant medical history. 6. Physical examination without clinically significant findings within the 56 days prior to enrollment. 7. Adequate venous access if assigned to an IV group or adequate abdominal subcutaneous tissue if assigned to a SC group. 8. Willing to have blood samples collected, stored indefinitely, and used for research purposes. Laboratory Criteria within 56 days prior to enrollment: 9. White blood cell count (WBC): 2,500-12,000/mm\^3. 10. WBC differential either within institutional normal range or accompanied by the Principal Investigator (PI) or designee approval, excluding absolute lymphocyte count which must not be lower than normal range. 11. Platelets: 125,000 - 400,000/mm\^3. 12. Hemoglobin within institutional normal range or is lower than normal range but does not meet Grade 1 criteria and is not clinically concerning. 13. Creatinine: \<= 1.1 x Upper Limit of Normal (ULN). 14. ALT: \<= ULN. 15. AST: \<= ULN. 16. ALP: \<= ULN. 17. Total bilirubin within institutional normal range or is outside normal range but does not meet Grade 1 criteria and is not clinically concerning 18. Direct bilirubin: \<= ULN 19. Negative HIV 1/2 Antibody/Ag test. Female-Specific Criteria: 20. Agrees to use an effective means of birth control from 21 days prior to enrollment through the duration of study participation. 21. Negative beta-HCG (human chorionic gonadotropin) pregnancy test (urine or serum) on day of enrollment for women presumed to be of reproductive potential. EXCLUSION CRITERIA: A participant will be excluded if one or more of the following conditions apply: 1. Woman who is breast-feeding or planning to become pregnant during study participation. 2. Weight \> 115 kg. 3. Any history of a severe allergic reaction with generalized urticaria, angioedema or anaphylaxis prior to enrollment that has a reasonable risk of recurrence during the study. 4. Hypertension that is not well controlled. 5. Receipt of any investigational study product within 28 days prior to enrollment. 6. Receipt of an investigational HIV vaccine or anti-HIV monoclonal antibody. 7. Receipt of any live attenuated vaccine within 28 days prior to enrollment. 8. Receipt of any vaccine within 2 weeks prior to enrollment. 9. Known history of Gilbert's syndrome. 10. Known history of kidney or liver disease. 11. Diabetes mellitus (type I or II), with the exception of a history of gestational diabetes. 12. More than 10 days of systemic immunosuppressive medications or cytotoxic medications within the 4 weeks prior to enrollment or any within 14 days prior to enrollment. 13. Bleeding disorder diagnosed by a doctor (e.g., factor deficiency, coagulopathy, or platelet disorder requiring special precautions) or significant bruising or bleeding difficulties with IM injections or blood draws. 14. Any other chronic or clinically significant medical condition that in the opinion of the investigator would jeopardize the safety or rights of the volunteer, including but not limited to diabetes mellitus, hepatitis, asthma, infectious disease, autoimmune disease, psychiatric disorder, heart disease, cancer and clinically significant forms of drug or alcohol abuse.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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National Institutes of Health Clinical Center
Bethesda, Maryland, 20892, United States
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