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Hematoxylin and eosin staining revealed poorly differentiated carcinoma with round cells and rhabdoid morphology (A, 100×). Positive expression of CK5/6 (B, 100×) and CK7 (C, 100×). Suggestive SMARCA4-UT by diffuse negative immunostaining BRG1 (D, 100×) and SALL4 (E, 100×). The tumor proportion score of PD-L1 was 12% with 22C3 antibody (F, 100×).

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Xiaotong Qiu, Liangkun You, Chongwei Wang, Jin Sheng

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