Study for Evaluation of the Safety, Pharmacokinetics, and Antiviral Activity of UB-421 Subcutaneous Formulation Administered in HIV-1 Infected Treatment Naive Patients

Summary

This is a phase I, open-label, dose-escalation study to investigate short-term safety, pharmacokinetics, and antiviral activity of UB-421 SC with 4 weekly doses in treatment naive HIV-1 infected patients. Eligible (n=6 per dose cohort) subjects will be sequentially enrolled into 3 escalating-dose cohorts to receive 4 weekly fixed doses of UB-421 SC at either 250 mg (Cohort A), 500 mg (Cohort B) or 700 mg (Cohort C). Subjects should be followed for safety for additional 4 weeks after the last UB-421 SC dosing. In order to control viral load while minimizing confounding in safety assessment, subjects can initiate standard anti-retroviral therapy (ART) two weeks after the last UB-421 SC dosing.

Escalation to the next higher dose cohort will be determined based on dose limited toxicity (DLT) evaluation. The dose escalation will be stopped if ≥ 2/6 subjects experience DLT or when clinical trial steering committee (CTSC) determines it is not suitable to escalate the dose level.

In this study, DLT is defined as any ≥ grade 3 AE occurred within 21 days from prior UB-421 SC dosing and is considered drug related.

When there is any ≥grade 3 AE(s) occurred within 21 days from prior UB-421 SC dosing in any subject out of the current dose cohort (n=6), the duty of the CTSC will be initiated. The CTSC will be responsible for DLT evaluation. The committee members will evaluate the safety data of all subjects in each cohort through baseline to at least 21 days following the last UB-421 SC dosing. The administration of the next higher dose level at TV1 will be conducted after the committee grants the dose escalation. However, dose escalation will be proceeded if there is no ≥ grade 3 AE and upon agreement from all investigators without holding the steering committee meeting.

Subjects will be assessed at Screening, weekly during Treatment Period and Follow-up Period. The assessment includes physical examination, vital sign, laboratory parameters, HIV-1 viral load, CD4+ and CD8+ T-cell counts. Samples for the drug concentration measurement will be collected at weekly intervals throughout the study, immediately before UB-421 SC dosing. Additional intensive PK sampling will be scheduled during the first dosing interval (from TV1 to TV2) at 1, 3, 6, 24, 48, 72 and 96 hours post first UB-421 SC dosing for PK subgroup (at least 3 subjects per dose cohort). The immunogenicity of UB-421 SC will be monitored by measuring anti-UB-421 antibodies in pre-dose serum samples at day 0 and post-dose serum at day 14, 28, 35, 42 and 49. Viral reservoir, immunophenotyping and CD4+ (D1) receptor occupancy will also be explored.

Subjects should discontinue from UB-421 SC treatment if they experience a sustained decrease from baseline in CD4+ (D2) T cell counts of ≧50% at two consecutive visits or drug-related AE(s) with severity grade 3 or 4 (according to the Division of AIDS, National Institute of Allergy and Infectious Diseases (DAIDS) AE grading).

Conditions

• HIV-1 Infection

Interventions

BIOLOGICAL

UB-421 SC(dB4C7C22-6 mAb)

The UB-421 SC (dB4C7C22-6 mAb) will be supplied at a concentration of 125 mg/mL after reconstitution. Subjects will receive weekly UB-421 SC injections during the 4-week Treatment Period.

Sponsors & Collaborators

• Kaohsiung Medical University Chung-Ho Memorial Hospital

  collaborator OTHER

• Kaohsiung Veterans General Hospital.

  collaborator OTHER

• Taoyuan General Hospital

  collaborator OTHER_GOV

• United BioPharma

  lead INDUSTRY

Study Design

Allocation

NON_RANDOMIZED

Purpose

TREATMENT

Masking

NONE

Model

SEQUENTIAL

Eligibility

Min Age

20 Years

Sex

ALL

Healthy Volunteers

No

Timeline & Regulatory

Start

2021-01-01

Primary Completion

2022-05-25

Completion

2022-05-25

Countries

• Taiwan

Study Locations