[A Case of Primary Breast Cancer and Gastric Cancer Metastasis to the Skin-Usefulness of Immunohistochemistry in Differentiating Primary Breast Cancer from Metastatic Breast Cancer].

We herein report the case of a 76-year-old female patient who had undergone gastrectomy for advanced gastric cancer (histologically tubular adenocarcinoma)before 5 months, presenting with abdominal skin tumor. A skin biopsy revealed tubular adenocarcinoma. Positron emission tomography-computed tomographic scanning detected right breast tumor.

[A Case of Synchronous Colorectal Cancer Successfully Treated by Laparoscopic Surgery with Two Segmental Anastomoses].

A 63-year-old man was admitted for the evaluation of Hb 4.8 g/dL anemia. He underwent colon fiberscopy and was subsequently diagnosed with synchronous cancers of the ascending colon and rectum.

[A Case of Laparoscopic Gastrojejunostomy for Duodenal Obstruction Caused by Unresectable Locally Advanced Pancreatic Cancer].

The patient was an 85-year-old man who received chemotherapy with gemcitabine for 2 years 9 months under the diagnosis of unresectable locally advanced pancreatic body and tail cancer. He visited our hospital because of anorexia, upper abdominal fullness, and vomiting. A CT scan showed severe stenosis in the third portion of the duodenum, which was associated with the direct invasion of the advanced pancreatic cancer.

[Primary Small-Cell Carcinoma of the Digestive Tract-An Analysis of Six Cases].

Introduction: Primary small-cell carcinomas occur commonly in the lungs but rarely in the other organs. We studied the treatment outcomes in 6 cases of primary small-cell carcinoma of the digestive tract at our hospital.

Patients: Six patients were diagnosed with small-cell carcinoma of the digestive tract histopathologically and treated at our hospital from September 2000 to December 2018.