SYN-004 Safety and Tolerability in Allo-HCT Subjects

Last updated: January 3, 2025
Sponsor: Theriva Biologics, Inc.
Overall Status: Active - Not Recruiting

Phase

1/2

Condition

N/A

Treatment

SYN-004, Ribaxamase or Placebo

Clinical Study ID

NCT04692181
SB-1-004-006
  • Ages > 18
  • All Genders

Study Summary

Study Objectives:

  1. To evaluate the safety and tolerability of oral SYN-004 in adult allogeneic HCT (allo-HCT) recipients who develop fever after conditioning therapy and are treated with IV β-lactam antibiotics meropenem (MER), piperacillin tazobactam (PIP/TAZO), or cefepime (FEP).

  2. To evaluate potential absorption of oral SYN-004 into the systemic circulation of allo-HCT recipients and potential SYN-004-mediated alterations to systemic levels and efficacy of IV MER, PIP/TAZO or FEP.

  3. To evaluate potential protective effects of SYN-004 on the intestinal microbiome of allo-HCT recipients treated with IV MER, PIP/TAZO or FEP.

  4. To obtain preliminary information on potential therapeutic benefits and patient outcomes of SYN-004 in allo-HCT recipients treated with IV MER, PIP/TAZO or FEP

Eligibility Criteria

Inclusion

Inclusion Criteria:

  1. Participant provides written informed consent.

  2. Male or female patients ≥18 years undergoing myeloablative allo-HCT for ahematologic malignancy or myeloproliferative disorder.

  3. Participant is able to ingest the SYN-004 dosage form (size 0 hard capsule).

Exclusion

Exclusion Criteria:

  1. Allergy(ies) to MER, PIP, TAZO, or FEP.

  2. History of allergy to SYN-004 or its components.

  3. Admitted for HCT and started on MER, PIP/TAZO, or FEP prior to enrollment in thepresent study.

  4. Currently enrolled in another interventional clinical study or received aninvestigational drug or device within 30 days or within a time period consistentwith a washout period of 5 half-lives before signing the Informed Consent Form,whichever is longer.

  5. Recipients of umbilical cord blood transplantation.

  6. Underlying condition requiring HCT is not in remission (per International WorkingGroup definitions), except for myelodysplastic syndrome and lymphoma, as long asthese conditions are chemotherapy responsive.

  7. Creatinine clearance <60 mL/min/1.73 m² by Cockroft-Gault calculation.

  8. Cardiac ejection fraction <50%.

  9. Cirrhosis, bilirubin >1.5x upper limit of normal, or AST/ALT >2.5x upper limit ofnormal.

  10. History of veno-occlusive disease (VOD) or hepatic sinusoidal obstructive syndrome (SOS).

  11. DLCO and/or FEV1 ≤80% of normal.

  12. Chronic HIV or HBV infection.

  13. Invasive fungal infection not responding to treatment at time of HCT.

  14. Known active bacterial or viral infection at time of HCT.

  15. CDI in the preceding 6 months.

  16. Unable to comply with study protocol as determined by primary investigator.

  17. Active gastrointestinal (GI) bleeding at time of HCT.

  18. Prior colectomy or short gut syndrome.

  19. Pregnant or breast feeding.

Study Design

Total Participants: 36
Treatment Group(s): 1
Primary Treatment: SYN-004, Ribaxamase or Placebo
Phase: 1/2
Study Start date:
February 15, 2021
Estimated Completion Date:
December 31, 2026

Study Description

Study Design:

This is a single-center, placebo controlled, double blinded Phase 1b/2a study to assess the safety, tolerability and potential efficacy of orally administered SYN-004 in adult allo-HCT recipients. Participants will be randomized 2:1 to SYN-004 or placebo in blocks of three, stratified in three cohorts based on study assigned antibiotic (MER, piperacillin/tazobactam [PIP/TAZO], FEP) to be administered if the treating clinicians determine initiation of broad-spectrum antibiotics is indicated. As such, there will be six groups based on antibiotic cohort and randomized assignment of study drug:

Group 1: Placebo + IV MER (n=4) (MER control). Group 2: SYN-004 + IV MER (n=8) (MER treatment). Group 3: Placebo + IV PIP/TAZO (n=4) (PIP/TAZO control). Group 4: SYN-004 + IV PIP/TAZO (n=8) (PIP/TAZO treatment). Group 5: Placebo + IV FEP (n=4) (FEP control). Group 6: SYN-004 + IV FEP (n=8) (FEP treatment). Study-assigned antibiotics will be dosed as follows (adjusted for renal function as needed): MER 1 gram every 8 hours, PIP/TAZO 4.5 grams every 6 hours, FEP 1 gram every 8 hours. SYN-004 treated participants (Groups 2, 4 and 6) will be compared to control participants who receive placebo (Groups 1, 3 and 5, respectively). The study will be conducted in stages, commencing with Groups 1 and 2 who will be assigned to receive MER if antibiotics are indicated. MER is the first cohort because anti-infective efficacy of MER is not anticipated to be affected if SYN-004 is absorbed systemically. Accrual for Groups 3 and 4 (PIP/TAZO cohort) will begin only after review of the data from Groups 1 and 2 by the Data and Safety Monitoring Committee (DSMC) and agreement to proceed. PIP/TAZO is the next cohort because TAZO is a beta-lactamase inhibitor. As such, in the unlikely event of SYN-004 systemic absorption, TAZO systemic concentrations should be sufficient to inhibit any absorbed SYN-004. Accrual for the FEP cohort will begin after approval by the DSMC's review of results from groups 3 and 4.

Patients planned to receive an allo-HCT will be eligible for enrollment in the study and can be enrolled anytime from when it is known they will undergo HCT until day +1 after HCT (day of study drug start). Written informed consent will be obtained by all patients. To count towards the enrollment goal of 36 participants, a study participant must receive at least 80% of scheduled study drug doses from initiation of study assigned antibiotics through the second antibiotic pharmacokinetic assessment (7-9 days of concomitant study drug and study assigned antibiotic). Additional participants will be enrolled to replace participants who do not meet criteria to count towards the goal study enrollment until the goal enrollment is achieved.

This Phase 1b/2a study will use the SYN-004 dosing regimen (150 mg, PO, q6h) used in previous Phase 1 and Phase 2 clinical trials in healthy volunteers and patents with LRTIs. The first dose of study drug will be administered at day +1 after HCT and will be continued until Criteria for Discontinuation of Study Drug are met.

The study will consist of two periods: the Treatment Period and the Follow-up Period.

  1. The Treatment Period will be defined as the time from first dose of study drug until the last dose. For participants who do not meet criteria for early discontinuation, study drug will be continued for 72 hours after last dose of MER, PIP/TAZO, or FEP.

  2. The Follow-up Period begins after cessation of study drug dosing and is split into three parts:

    • Part A: up to 30 days after study drug was discontinued

    • Part B: from end of Part A to day +180 after HCT

    • Part C: from end of Part B to day +365 after HCT Patients enrolled in the study will receive conditioning and HCT according to their treatment plan. Fever and time of antibiotic start will be defined per local standard of care of patients. Cessation of antibiotic therapy and/or changes to antibiotic therapy will be at the discretion of the treating physician.

All participants will be evaluated as outlined in the Schedule of Assessments. At predetermined points during the study as outlined in the SOA, blood samples, urine samples, fecal swabs, and fecal samples will be collected for the indicated analyses.

Connect with a study center

  • Washington University

    Saint Louis, Missouri 63110
    United States

    Site Not Available

Not the study for you?

Let us help you find the best match. Sign up as a volunteer and receive email notifications when clinical trials are posted in the medical category of interest to you.