Fig. 2

The microscopic representative pictures with significant differences in morphology in Swi/Snf-deficient ECA. (A-B) Swi/Snf-deficient ECA was poorly differentiated, exhibiting medullary features and marked nuclear pleomorphism, with some nuclei showing vacuolar changes (red arrows). (C-E) The stroma frequently demonstrated necrosis, lymphocytic infiltration (including stromal tumor-infiltrating lymphocytes (sTILs), peritumoral lymphocytic aggregation, and formation of tertiary lymphoid structures (TLS). (F-J) In contrast, Swi/Snf-intact ECA rarely exhibited these morphological features