Abstract:
:SMARCA4-deficient thoracic sarcoma (SMARCA4-DTS) is a new clinical entity characterized by SMARCA4 inactivation and has a dismal prognosis because of rapid growth. Effective treatments for SMARCA4-DTS have not yet been developed. Most recently, anti-programmed cell death 1 receptor (PD-1) blockade has been effective for SMARCA4-deficient lung cancer and malignant rhabdoid tumor-like tumors. Here, we describe a patient with SMARCA4-DTC who experienced a marked response to the administration of pembrolizumab. A 70-year-old female was referred to our department for treatment of SMARCA4-DTC. Positron emission tomography-computed tomography had revealed a left mediastinal tumor, peritoneal dissemination and multiple cutaneous metastases at diagnosis. Immunohistochemical analyses revealed 60% of tumor cells expressed programmed cell death ligand 1 (PD-L1). The patient was given pembrolizumab as first-line treatment. Pembrolizumab suppressed tumor growth dramatically, with only one dose leading to a partial response. Our case suggests the immunohistochemical analysis of PD-L1 expression be undertaken for patients with SMARCA4-DTS and that pembrolizumab treatment may be a promising strategy for PD-L1-positive SMARCA4-DTS.
journal_name
Thorac Cancerjournal_title
Thoracic cancerauthors
Takada K,Sugita S,Murase K,Kikuchi T,Oomori G,Ito R,Hayasaka N,Miyanishi K,Iyama S,Ikeda H,Kobune M,Emori M,Kato J,Hasegawa Tdoi
10.1111/1759-7714.13215subject
Has Abstractpub_date
2019-12-01 00:00:00pages
2312-2315issue
12eissn
1759-7706issn
1759-7714journal_volume
10pub_type
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