SMARCA4 and sarcoma: As already mentioned, in the latest edition of WHO classification of thoracic tumors, the pathology community chose to not use anymore the term “sarcoma” to described this entity, instead the term SMARCA4-UT was preferred to better reflect their possible epithelial histogenesis.52 In a useful way our study highlighted SMARCA4-UT similarities with other subtypes of thoracic sarcomas, but also their distinct immune profile from SMARCA4-deficient NSCLC.