Ceftolozane-Tazobactam for Directed Treatment of Pseudomonas Aeruginosa Bacteremia and Pneumonia in Patients With Hematological Malignancies and Hematopoietic Stem Cell Transplantation
The goal of this clinical trial is to learn whether the antibiotic ceftolozane-tazobactam works to treat serious Pseudomonas aeruginosa infections in people with blood cancers or who received a stem cell transplant. The main question it aims to answer is whether participants reach clinical success 30 days after the infection is first found. Clinical success means the person is alive, their infection symptoms are improving, and the infection has not returned. Participants will receive ceftolozane-tazobactam through a vein every 8 hours for 10 to 14 days. Treatment may continue for up to 21 days if the infection is not improving or keeps coming back. The infection is diagnosed using the hospital's standard rapid molecular tests, which help confirm Pseudomonas aeruginosa quickly so treatment can begin right away. Researchers will follow participants during their hospital stay and check on them around 30 and 60 days to see how well the treatment worked. The study will also look at how long it takes for the infection to clear, how long participants stay in the hospital or intensive care unit, and whether the bacteria become resistant to antibiotics. In addition to the prospective ceftolozane-tazobactam group, the study includes a historical control group made up of patients with similar infections who were treated in the past with standard anti-pseudomonal antibiotics (such as cefepime, ceftazidime, piperacillin-tazobactam, or meropenem). Data from these historical controls are collected by chart review and analyzed alongside the prospective group to compare outcomes. Historical controls do not receive study-directed treatment and are not actively enrolled under this protocol.
Ask AI to explain this studyKey things to know
This describes the study’s primary purpose.
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These are broad labels—not an eligibility decision.
Checked against the public recordLast updated Jan 21, 2026 · Source: ClinicalTrials.gov
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Interventional
Locations may change over time.
Study sponsor
What this study is about
- Purpose
- Treatment
- Study type
- Interventional
- Phase
- Phase 4
- Sponsor
- Weill Medical College of Cornell University
- Interventions being studied
- Drug: Ceftolozane / Tazobactam Injection
How this study is categorized
These labels come from structured fields and exact terms in the public record.
Who may be able to participate
The sponsor separates these requirements into two groups. You do not need to interpret them alone—use them to guide a conversation with the study team.
- Eligibility Criteria
- Presence of a hematologic malignancy or a history of hematopoietic stem cell transplantation
- Identification of Pseudomonas aeruginosa by rapid molecular diagnostic testing from a positive blood culture or from a respiratory sample in the setting of radiologically documented pneumonia with compatible clinical symptoms
- Age 18 years or older
- Ability of the participant or legally authorized representative to provide informed consent
- Receipt of more than 72 hours of non-study anti pseudomonal therapy for the infection being treated
- Known anaphylactic hypersensitivity or allergic reaction to cephalosporins
- History of a Pseudomonas aeruginosa isolate with a ceftolozane or tazobactam MIC greater than 4 micrograms per milliliter
- Polymicrobial aerobic Gram negative infection, as determined by the infectious diseases research team
- Hemodialysis, continuous renal replacement therapy, or creatinine clearance less than 15 milliliters per minute
- Expected mortality within 48 hours of screening Eligibility Criteria for Historical Controls Inclusion Criteria
- Presence of a hematologic malignancy or a history of hematopoietic stem cell transplantation
- Identification of Pseudomonas aeruginosa associated with bacteremia and or pneumonia
- Age 18 years or older
- Survival greater than 48 hours after initiation of anti pseudomonal therapy for Pseudomonas aeruginosa bacteremia and or pneumonia
Important: This is the sponsor’s public criteria, not a determination of eligibility. The study team must review your individual situation.
U.S. locations
- Weill Cornell MedicineNew York, New York
Source and freshness
Processed from ClinicalTrials.gov. Last public update: Jan 21, 2026. Always confirm current availability with the study team.