Fig. 3From: Spontaneous regression of transverse colon cancer with high-frequency microsatellite instability: a case report and literature reviewHematoxylin-eosin staining shows a poorly differentiated adenocarcinoma with tumor-infiltrating lymphocytes (TILs) in the tumor stroma (a, b). Immunohistological examination shows strong positivity for AE1/AE3 (c) and positivity for p53 (d) in the tumor; therefore, it was proven to be an adenocarcinomaBack to article page