Fig. 1

Histopathological examination of primary gastric carcinoma. a The clusters of hyperchromatic and pleomorphic cancer cells were observed under optical microscope. The primary tumor was composed of poorly differentiated adenocarcinoma cells. (hematoxylin and eosin staining, ×100). The IHC investigations of primary tumor specimens demonstrated immunoreactivity of CK7 (b) and CK20 (c). (Diamino-benzidine staining, ×100)