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OpenTrials
Active, not recruiting

NCT Number: NCT07762001

Study to Evaluate the Safety and Tolerability of AD-NP1 in Healthy Human Adult Volunteers

This is a Phase 1 single-blind, placebo-controlled, dose-escalation study designed to evaluate the safety of AD-NP1, a humanized monoclonal antibody targeting human ectonucleotide pyrophosphatase/phosphodiesterase-1 (ENPP1). The study aims to assess the maximum tolerated dose (MTD), pharmacokinetics (PK), pharmacodynamics (PD), and immunogenicity of AD-NP1 in healthy volunteers. Participants will be randomized to receive either AD-NP1 or placebo, with safety and efficacy monitored in accordance with Good Clinical Practice (GCP) guidelines. The study also seeks to explore changes in health-related quality of life (HRQOL) during the trial.

Active, not recruiting

This study is active but is not currently recruiting participants.

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Key information

Age range

21 year–65 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 1

Primary location

UCLA Clinical and Translational Research Center

Los Angeles, California, 90095, United States

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Body weight ≤ 90kg
  • Ability to understand and the willingness to sign a written informed consent document
  • Study subject must have read, understood, and provided written informed consent and HIPAA authorization after the nature of the study has been fully explained
  • Be in general good health without history of any of the conditions listed in exclusion criteria
  • No use of any tobacco products for at least 6 months
  • Woman/women of childbearing potential (WOCBP) must agree not to become pregnant from the time of study enrollment until at least 6 months after the completion of the monoclonal antibody infusion. If a WOCBP is sexually active and has no history of hysterectomy or tubal ligation, she must agree to use hormonal or barrier birth control with spermicidal gel
  • Sexually active male subjects must use a barrier method of contraception during the study
  • Screening laboratory values must meet the following criteria:
  • WBC (>3,000 - <11,000/mm^3)
  • Platelets (>100,000/mm^3)
  • Hemoglobin (>10.5 gm/dl)
  • Creatinine (<1.1 x upper limit of normal [ULN])
  • BUN (<1.25 x ULN)
  • AST (<1.1 x ULN)
  • ALT (<1.1 x ULN)
  • Alkaline Phosphatase (<1.1 x ULN)
  • Bilirubin (<1.1 x ULN)
  • Glucose-non-fasting (> 60 mg/dl and < 115 mg/dl)
  • Human immunodeficiency virus (HIV)-infected individuals on effective antiretroviral therapy with undetectable viral load within 6 months are eligible for this trial
  • For subjects with evidence of chronic hepatitis B virus (HBV) infection, the HBV viral load must be undetectable on suppressive therapy, if indicated
  • Individuals with a history of hepatitis C virus (HCV) infection must have been treated and cured. For individuals with HCV infection who are currently on treatment are eligible if they have an undetectable HCV viral load

Exclusion criteria

  • Previous exposure to humanized or human monoclonal antibodies whether FDA approved or investigational
  • Weight > 90 kg
  • History of any of the following illnesses or conditions:
  • a. Respiratory condition (such as asthma requiring daily medication)
  • b. Clinically immunocompromised due to any primary immune or autoimmune deficiency, as a result of chronic disease, cancer or medication used to treat these diseases
  • c. Blood dyscrasias
  • d. Psychiatric disorder that precludes compliance with the clinical protocol
  • e. Hepatitis
  • Any chronic condition requiring daily prescription or over-the-counter medicine except for vitamins and birth control products
  • History of drug or alcohol abuse within previous 12 months or a positive urine toxicology screen within 24 hours of initial screening
  • History of a previous severe allergic reaction with generalized urticaria, angioedema, or anaphylaxis
  • Physical finding on examination considered clinically significant such as heart murmur (other than functional), hepatosplenomegaly, lymphadenopathy, or focal neurological deficit
  • Urinalysis positive for > trace protein, >5 RBC/HPF or >5 WBC/HPF
  • Positive serology for HIV antibody, HCV antibody or Hepatitis B surface antigen
  • Positive serum pregnancy test during screening or positive urine pregnancy test within 24 hours of monoclonal antibody administration, or an unwillingness to undergo pregnancy testing
  • Currently breast-feeding
  • Receipt of an FDA approved vaccine or any investigational study agent within previous 30 days
  • Any other condition that in the opinion of the investigator would jeopardize the safety or rights of the subject participating in the study

Treatment and study plan

AD-NP1

Drug

AD-NP1 is a humanized monoclonal antibody targeting the catalytic domain of human ENPP1. It is administered intravenously at escalating doses (30 mg/kg, 40 mg/kg, 60 mg/kg, and 100 mg/kg).

Placebo

Drug

Placebo is a normal saline solution administered intravenously in volumes matched to the corresponding AD-NP1 doses (30 mg/kg, 40 mg/kg, 60 mg/kg, and 100 mg/kg)

Primary outcomes

  1. Safety and tolerability of escalating doses of a single IV dose of AD-NP1

    Time frame: Day of infusion (Day 0) to 28 days post-dose

    Assessed by the incidence of treatment-related Adverse Events (AEs) using the Common Terminology Criteria for Adverse Events (CTCAE) v5.0.

Secondary outcomes

  1. Maximum Tolerated Dose of AD-NP1

    Time frame: Day of infusion (Day 0) to 28 days post-dose

    To be determined based on dose limiting toxicities (DLTs) and adverse events

  2. Maximum Plasma Concentration (Cmax) as a pharmacokinetics (PK) parameter

    Time frame: Baseline (pre-dose) up to Day 60 post-dose

    Peak plasma concentration obtained directly from the experimental data points, to be measured in Nanograms per milliliter (ng/mL)

  3. Time to Maximum Plasma Concentration (Tmax) as a pharmacokinetics (PK) parameter

    Time frame: Baseline (pre-dose) up to Day 60 post-dose

    Tmax presents the time at which Cmax is observed, to be measured in hours (h) and minutes (m)

  4. Apparent Volume of Distribution (Vd) as a pharmacokinetics (PK) parameter

    Time frame: Baseline (pre-dose) up to Day 60 post-dose

    Volume of distribution calculated during the terminal elimination phase following administration, to be measured in Liters (L) or Liters per kilogram (L/kg)

  5. Area Under the Plasma Concentration-Time Curve (AUC) as a pharmacokinetics (PK) parameter

    Time frame: Baseline (Pre-dose), 30 minutes, 1, 2, 4, 6 hours, and Days 1, 3, 7, 14, 28, 60 post-dose.

    AUC calculated using the linear-log trapezoidal rule from time zero (pre-dose) to the last quantifiable concentration point to be measured in Nanogram x hours per milliliter (ng * h/mL)

  6. Terminal Elimination Half-life (T(1/2)) as a pharmacokinetics (PK) parameter

    Time frame: Baseline (pre-dose) up to Day 60 post-dose

    The rate at which Ad-NP1 is cleared from the systemic plasma circulation, to be measured in Liters per hour (L/h) or Milliliters per minute per kilogram (mL/min/kg)

  7. Total Body Clearance (CL) as a pharmacokinetics (PK) parameter

    Time frame: Baseline (pre-dose) up to Day 60 post-dose

    The rate at which AD-NP1 is cleared from the systemic plasma circulation, to be measured in Liters per hour (L/h) or Milliliters per minute per kilogram (mL/min/kg)

  8. Plasma Uridine Concentration

    Time frame: Baseline (pre-dose), and Days 1, 3, 7, 14, and 28 post-dose.

    Plasma concentrations of uridine will be quantified using Liquid Chromatography-Mass Spectrometry (LC/MS).

  9. Plasma Cytidine Concentration

    Time frame: Baseline (pre-dose), and Days 1, 3, 7, 14, and 28 post-dose.

    Plasma concentrations of cytidine will be quantified using Liquid Chromatography-Mass Spectrometry (LC/MS)

  10. Plasma Orotidine Concentration

    Time frame: Baseline (pre-dose), and Days 1, 3, 7, 14, and 28 post-dose.

    Plasma concentrations of orotidine will be quantified using Liquid Chromatography-Mass Spectrometry (LC/MS)

  11. Plasma Adenine Concentration

    Time frame: Baseline (pre-dose), and Days 1, 3, 7, 14, and 28 post-dose.

    Plasma concentrations of adenine will be quantified using Liquid Chromatography-Mass Spectrometry (LC/MS)

  12. Plasma Carbamoyl Aspartate Concentration

    Time frame: Baseline (pre-dose), and Days 1, 3, 7, 14, and 28 post-dose.

    Plasma concentrations of carbamoyl aspartate will be quantified using Liquid Chromatography-Mass Spectrometry (LC/MS).

  13. Immunogenicity of a single IV dose of AD-NP1

    Time frame: Baseline (pre-dose) and Days 1, 7, 14, 28, 90, and 180 post-dose

    Determined by measuring levels of circulating anti-drug antibody in blood samples

Sponsors and collaborators

Lead sponsor

Arjun Deb, MD

Other

Collaborators

  • United States Department of Defense

Registry information

Official study title

A Phase 1 Single-blind, Placebo-controlled, Dose Escalation Study to Evaluate the Safety of AD-NP1, a Humanized Monoclonal Antibody Targeting Human ENPP1

Important dates

Study start
2026
Primary completion
2028
Study completion
2028
First posted
Aug 13, 2026
Registry last updated
Aug 14, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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