Abstract
Purpose
STAT proteins play a key role in several cellular functions related to cell development, differentiation, proliferation, and survival. Persistent STAT activation due to somatic STAT5bN642H gain-of-function mutation is a rare mechanism of STAT dysregulation that results in hypereosinophilia, frequent infections, leukemias, and pulmonary diseases. Herein, we describe a case of a child with a rare early onset STAT5b gain-of-function disease treated with targeted JAK inhibition who developed a cranial Mycobacterium avium osteomyelitis.
Methods
A 3-year-old male with a known STAT5b gain-of-function mutation presented with a 10-day history of a firm, immobile, non-painful cranial mycobacterium mass with dural infiltration located anterior to the coronal suture. Stepwise management finalized with complete resection of the lesion with calvarial reconstruction. A case-based literature review was performed evaluating all patients with this mutation who developed cranial disease.
Results
The patient was symptom and lesion-free at 1 year since surgical resection and initiation of triple mycobacterial pharmacotherapy. Our literature review demonstrated the rarity of this disease, as well as other presentations of this disease in other patients.
Conclusion
Patients with STAT5b gain-of-function mutations have attenuated Th1 responses and are treated with medications, such as JAK inhibitors, which further inhibit other STAT proteins that regulate immunity against rare infectious entities, such as mycobacterium. Our case highlights the importance of considering these rare infections in patients on JAK inhibitors and with STAT protein mutations. Possessing a clear mechanistic understanding of this genetic mutation, its downstream effect, and the consequences of treatment may enhance a physician’s diagnostic and clinical management of similar patients in the future.
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Abbreviations
- STAT5b:
-
Signal Transducer and Activator of Transcription 5b
- GOF:
-
Gain-of-function
- GH:
-
Growth hormone
- JAK:
-
Janus Kinase
- PTCL:
-
Peripheral T-cell lymphoma
- T-ALL:
-
T-cell acute lymphoblastic leukemia
- IFN-ϒ:
-
Interferon gamma
- HES:
-
Hypereosinophilia syndrome
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AJK, SA, AB, DO, RH, RE were involved in the composition of this manuscript and AJK, RE, RA were involved in revision and review of this manuscript. AJK and RA developed the concept for this report.
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Kobets, A.J., Ahmad, S., Boyke, A. et al. STAT5b gain-of-function disease in a child with mycobacterial osteomyelitis of the skull: rare presentation of an emerging disease entity. Childs Nerv Syst 39, 2071–2077 (2023). https://doi.org/10.1007/s00381-023-05997-y
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DOI: https://doi.org/10.1007/s00381-023-05997-y