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Updated: Dec 26, 2025

Author Spotlight: Investigating the Pathophysiology of Eosinophilic Esophagitis
Published on: May 10, 2024
Tegafur/gimeracil/oteracil-induced eosinophilic pneumonia
Toshiyuki Sumi1,2, Hisashi Nakata1, Yuji Mori1
1Department of Pulmonary Medicine Hakodate Goryoukaku Hospital Hakodate Japan.
Tegafur/gimeracil/oteracil (TS-1) can cause eosinophilic pneumonia, a type of drug-induced lung injury. Awareness is crucial for clinicians managing patients on this chemotherapy regimen.
Area of Science:
- Pulmonology
- Oncology
- Pharmacology
Background:
- Drug-induced lung injury (DILI) encompasses various pulmonary reactions to medications.
- Chemotherapy agents, including combination drugs like TS-1, are known to cause DILI.
Purpose of the Study:
- To highlight eosinophilic pneumonia as a potential adverse event of tegafur/gimeracil/oteracil (TS-1).
- To increase clinician awareness of this specific DILI manifestation.
Main Methods:
- This is a statement of awareness based on clinical observation and literature.
- No specific experimental methods were employed for this summary.
Main Results:
- Eosinophilic pneumonia is identified as a specific type of drug-induced lung injury.
- Tegafur/gimeracil/oteracil (TS-1) is implicated as a causative agent.
Conclusions:
- Clinicians must consider TS-1 as a potential cause of eosinophilic pneumonia in patients presenting with relevant symptoms.
- Early recognition and management of TS-1-induced lung injury are critical for patient outcomes.
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