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Imipenem versus targeted therapy in cancer patients
M Aoun1, F Crokaert, M Paesmans
1Département des Maladies Infectieuses, Institut J. Bordet, Bruxelles, Belgium.
Abstract:
In many instances, broad-spectrum antibiotics are initiated empirically in febrile cancer patients and continued for the whole duration of therapy. An alternative is to narrow the spectrum whenever the offending pathogen is identified. This study is aimed at comparing these two options. Non-neutropenic cancer patients with severe infections received empiric imipenem. After 72 h, those with microbiologically documented infection were randomized either to continue imipenem or to receive a targeted therapy. After 72 h of imipenem 76.1% were improved. After randomization, a higher efficacy was observed with imipenem (88.5 vs. 72.1%: P = 0.025). Bacterial and fungal superinfections were comparable. Costs were lower for targeted therapy in gram-positive infection and higher in gram-negative infection.
Insights
For febrile cancer patients, continuing broad-spectrum antibiotics may be less effective than narrowing the spectrum once the pathogen is identified. Targeted antibiotic therapy showed higher efficacy in treating severe infections.
Area of Science:
- Infectious Diseases
- Oncology
- Pharmacology
Background:
- Broad-spectrum antibiotics are often used empirically for febrile cancer patients.
- Narrowing antibiotic spectrum upon pathogen identification is a potential alternative.
Purpose of the Study:
- To compare the efficacy and costs of empiric broad-spectrum versus targeted antibiotic therapy in non-neutropenic cancer patients with severe infections.
Main Methods:
- Non-neutropenic cancer patients with severe infections received empiric imipenem.
- Patients with microbiologically documented infections after 72 hours were randomized to continue imipenem or switch to targeted therapy.
Main Results:
- After 72 hours of empiric imipenem, 76.1% of patients improved.
- Randomized patients showed higher efficacy with continued imipenem (88.5%) compared to targeted therapy (72.1%; P = 0.025).
- Bacterial and fungal superinfections were similar between groups. Costs varied based on pathogen type.
Conclusions:
- Continuing broad-spectrum imipenem demonstrated higher efficacy than targeted therapy in this patient group.
- Cost-effectiveness of targeted therapy depends on the specific gram-positive or gram-negative infection.
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