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Updated: Jan 28, 2026
Establishment of a Primary Culture of Patient-derived Soft Tissue Sarcoma
Published on: April 11, 2018
Identification of infectious species after resection of soft-tissue sarcomas
Duncan C Ramsey1, Ryan A Jones2, Jason K Weiss2
1Department of Orthopedics and Rehabilitation, Oregon Health and Science University, Portland, Oregon.
Background:
Pathogenic species in deep tissue infections after soft-tissue sarcoma (STS) resection is largely unstudied, particularly the role of anaerobic bacteria, risks factors for those pathogens, and the time course of infection presentation.
Methods:
Retrospective analysis of 64 patients requiring operative debridement for deep tissue infection after STS resection was undertaken to identify infectious species and study risk factors for anaerobic infections. Kaplan-Meier methods examined the time course of infection presentation.
Results:
STS subtypes were most commonly pleomorphic STS, myxofibrosarcoma, and undifferentiated STS. Staphylococcus aureus was the most common organism isolated (56%). Twenty (31%) infections were positive for ≥1 anaerobic organism. Twelve gram-positive and 10 gram-negative aerobic organisms were isolated. Most (90%) anaerobic-containing infections were polymicrobial, vs 52% of purely aerobic infections. No significant risk factors for anaerobic infections were identified. Median time from tumor resection until debridement was significantly greater for anaerobic infections (54.5 days) than for purely aerobic infections (29.5 days; P = 0.004), a difference so pronounced that using "presentation after 53 days" as a proxy for the presence of anaerobic pathogens had an accuracy of 81%.
Conclusions:
Because polymicrobial and anaerobic bacterial infections are common, we strongly support antibiotic use with anaerobic coverage at debridement, particularly for infections presenting later.
Insights
Deep tissue infections after soft-tissue sarcoma (STS) resection are often polymicrobial and anaerobic. Later presentation suggests anaerobic pathogens, warranting antibiotic coverage with anaerobic activity.
Area of Science:
- Oncology
- Infectious Diseases
- Surgical Pathology
Background:
- Deep tissue infections post-soft-tissue sarcoma (STS) resection are understudied.
- The role of anaerobic bacteria and their risk factors in these infections remain unclear.
- Understanding the timeline of infection presentation is crucial.
Purpose of the Study:
- To identify pathogens involved in deep tissue infections after STS resection.
- To investigate risk factors associated with anaerobic bacterial infections.
- To analyze the temporal presentation of these infections.
Main Methods:
- Retrospective analysis of 64 patients undergoing debridement for deep tissue infection post-STS resection.
- Identification of infectious species and assessment of risk factors for anaerobic infections.
- Kaplan-Meier analysis to determine the time course of infection presentation.
Main Results:
- Staphylococcus aureus was the most common isolate (56%).
- Anaerobic organisms were present in 31% of infections, often polymicrobial (90%).
- Infections with anaerobic pathogens presented later (median 54.5 days vs. 29.5 days).
Conclusions:
- Polymicrobial and anaerobic bacterial infections are common following STS resection.
- Antibiotic therapy with anaerobic coverage is recommended for debridement.
- Later presenting infections are more likely to involve anaerobic pathogens.
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