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
Phase 1 trials primarily test safety and dosing in a small number of participants (typically 20–100). Results do not yet speak to efficacy. FDA approval is typically many years away from this stage.
Phase 2 trials begin testing efficacy in a larger patient group (100–300). This is often where biotech binary events occur — positive Phase 2 data can significantly advance a company's pipeline narrative, while failures can be terminal for a program.
Enrollment is complete. The trial is in its follow-up or data collection phase — a readout may occur on or near the primary completion date.
Theriva Biologics, Inc. (TOVX) is the sponsoring company for this trial. BiotechSign currently grades this company D (41/100) based on composite catalyst signals across its full pipeline. This trial is one data point in that overall catalyst picture.