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Histopathological examination of the tumors. (A) HE staining (magnification, ×100), and (B) E-cadherin and (C) β-catenin immunostaining (magnification, ×400) in the primary tumors. (D) HE staining (magnification, ×200), and (E) E-cadherin and (F) β-catenin immunostaining (magnification, ×400) in the intraluminal superior vena cava metastasis. HE, hematoxylin and eosin.
