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Durable response to the ALK inhibitor alectinib in inflammatory myofibroblastic tumor of the head and neck with a novel SQSTM1–ALK fusion: a case report

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Summary

An inflammatory myofibroblastic tumor (IMT) is a rare mesenchymal neoplasm that typically develops in the lungs and seldom in the head and neck region. It is often related to the anaplastic lymphoma kinase (ALK) fusion gene. Crizotinib, a first-generation ALK inhibitor, has been shown to have a notable response in patients with ALK-positive IMT. Here, we report the first case of a 46-year-old man with IMT harboring a novel SQSTM1–ALK fusion gene who demonstrated marked response to alectinib. The patient presented a right neck mass (5-cm diameter) that progressively enlarged and expanded to the upper mediastinum. ALK-rearranged IMT was diagnosed after complete tumor resection. Spindle cells displayed diffuse cytoplasmic staining for ALK on immunohistochemistry. A fluorescence in situ hybridization analysis revealed the translocation of a part of the ALK gene locus at chromosome 2p23. FoundationOne CDx™ assay identified an SQSTM1-ALK gene fusion. After a year, right cervical, subclavian, and mediastinal lymph node metastases, considered unresectable, developed. Notably, the patient exhibited a marked response to alectinib treatment and has sustained for 17 months following systemic therapy initiation without significant adverse events. This report highlights the possibility of alectinib being a reasonable option for advanced IMT with the SQSTM1-ALK fusion.

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Acknowledgements

The authors would like to thank Enago (www.enago.jp) for the English language review.

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Correspondence to Shigenori Kadowaki.

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This study does not contain any studies with human participants or animals performed by any of the authors.

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Informed consent was obtained from the patient for the publication of this case report.

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Honda, K., Kadowaki, S., Kato, K. et al. Durable response to the ALK inhibitor alectinib in inflammatory myofibroblastic tumor of the head and neck with a novel SQSTM1–ALK fusion: a case report. Invest New Drugs 37, 791–795 (2019). https://doi.org/10.1007/s10637-019-00742-2

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