Figure 1

Histological and immunohistochemical stains of colon adenocarcinoma. (a) Solid tumour nests and large polygonal cells (haematoxylin and eosin stain; original magnification, ×400). Immunohistochemical stains reveal positive findings for synaptophysin (b) (original magnification, ×400), cytokeratin AE1/AE3 (c) (original magnification, ×400) and chromogranin A (d) (original magnification, ×400). (e) Antigen Ki-67 immunostaging was positive in 60% of tumour cells (original magnification, ×400).