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Pulmonary sarcoidosis induced by interferon-alpha therapy
1Department of Pathology, University of Vermont, Burlington, VT, USA. kelly.butnor@vtmednet.org
The American Journal of Surgical Pathology
|June 17, 2005
Summary
Recombinant interferon-alpha (IFN-alpha), used for hepatitis C, can trigger sarcoidosis. Prompt recognition and IFN-alpha discontinuation can improve patient outcomes.
Area of Science:
- Immunology
- Hepatology
- Pulmonology
Background:
- Recombinant interferon-alpha (IFN-alpha) is a common treatment for chronic hepatitis C.
- IFN-alpha's role in stimulating the TH1 immune response is implicated in its potential to induce sarcoidosis.
Observation:
- IFN-alpha-associated sarcoidosis presents histologically like de novo sarcoidosis.
- Characterized by compact epithelioid non-necrotizing granulomas.
- Clinical presentation can be misleading as IFN-alpha side effects mimic sarcoidosis symptoms.
Findings:
- IFN-alpha can induce sarcoidosis development.
- Histological findings of IFN-associated sarcoidosis are similar to de novo sarcoidosis.
- The TH1 immune response stimulation is the presumed mechanism.
Implications:
- Pathologists must be aware of the IFN-alpha and sarcoidosis association.
- Clinicians should review medication history in suspected cases, especially with a hepatitis C history.
- Discontinuation of IFN-alpha can lead to symptom amelioration.
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