BACKGROUND/AIMS Clinicopathological investigation of the indications for the use of endoscopic papillectomy as a treatment for carcinoma in situ of the ampulla of Vater (CAV). MATERIALS AND METHODS Of 97 patients diagnosed with CAV in our department over the last 15 years, the 5 patients who received a carcinoma in situ diagnosis and were included in this retrospective study. RESULTS The le...

Background: Human Wharton’s jelly mesenchymal stem cells (HWJMSCs) express liver-specific markers such as albumin, alpha-fetoprotein, cytokeratin-19, cytokeratin-18, and glucose-6-phosphatase. Therefore, they can be considered as a good source for cell replacement therapy for liver diseases. This study aimed to evaluate the effects of various culture systems on the hepatocyte-specific gene expr...

We included in our study nine normal human thymuses and sixteen thymomas (1 type A, 2 type AB, 3 type B1, 3 type B2, 5 type B3 and 2 type C). The 25 patients were between 7 days and 75 years old, and were submitted to open surgery for correction of congenital heart defects or for mediastinal tumor mass. Biopsies were formalin fixed for 24 hours and then embedded in paraffin using routine proced...

Inflammatory myofibroblastic tumors (IMTs) are uncommon, mesenchymal lesions, and malignant transformation is extremely rare. The current study presents the case of a 56-year-old female with a rapidly growing mass in the right breast, which was diagnosed as IMT. Immunohistochemically, the mass was positive for smooth muscle actin (SMA) and Ki-67 (positive staining in 30% of the cells), and nega...

Using a polyclonal antibody against human epidermal keratins and a monoclonal antibody against cytokeratins characteristic of simple epithelia, and the Avidin-Biotin system of immunohistochemistry, we have demonstrated cytokeratin expression in 46% and in 60% of small cell carcinomas of the lung at autopsy respectively. The latter gave a diffuse stronger reaction product than the polyclonal ant...

Background & Aims. Hepatocyte apoptosis may play a role in progression of nonalcoholic fatty liver and oxidative stress seems one of the key mechanisms responsible for liver damage. The aim was to determine the association of oxidative stress with cytokeratin-18 M30 fragment levels, a marker of hepatocyte apoptosis. Methods. Steatosis severity was defined according to Hamaguchi's echographic cr...

UNLABELLED Endolymphatic sac tumor (ELST) is a rare neoplasm which can be encountered sporadically or in Von Hippel-Lindau (VHL) disease. Here we report a sporadic case of ELST in 31-year-old man. Neither the symptoms nor a family history of VHL disease were found in the patient. CT imaging demonstrated an expansile lytic lesion of the mastoid process of the left petrous bone. MR scanning revea...

The multi-step progression of colorectal cancer through precancerous lesions (adenoma and dysplasia) is associated with cumulative molecular alterations, a number of which have also been demonstrated to be present in morphologically normal transitional mucosa adjacent to colorectal cancer. The cytoskeletal protein cytokeratin 7 (CK7) and the receptor tyrosine kinase, KIT proto-oncogene receptor...

Aim: The histologic features, potential behavior, genetic pathways, epidemiological characteristics and response to treatment of gastric carcinomas, is showing heterogeneity. Cytokeratin (CK), an intermediate-sized filament detected primarily in epithelial cells. Most commonly used CKs in immunohistochemical studies are CK7, CK20 and these molecules are used as a markers to help identify the si...