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Introduction
Although alterations in SMARCA4‐deficient occur in non–small cell lung carcinoma (SD‐NSCLC), thoracic SMARCA4‐deficient undifferentiated tumor (TSDUT) is recognized as a distinct entity in the 2021 World Health Organization Classification of Thoracic Tumors because of unique morphologic, immunophenotypic and molecular features, and worse survival compared with SD‐NSCLC. Cytologic diagnosis...