Abstract
An 84-year-old male had a left breast mass for 2 years but left it untreated. He was transferred by ambulance to our hospital due to hematemesis and underwent upper gastrointestinal tract endoscopy for detailed examination of upper gastrointestinal hemorrhage. A Borrmann type Ⅱ tumor approximately 5cm in diameter was detected in the gastric cardia. Biopsy showed a moderately differentiated tubular adenocarcinoma (tub2). Therefore, gastric cancer was diagnosed. Chest computed tomography (CT) after admission showed a 3.5cm mass in the left breast, and breast ultrasound showed a hypoechoic mass. Needle biopsy gave a pathological diagnosis of invasive ductal breast carcinoma. The cancers were judged to not be metastases from other cancers but rather to be synchronous double cancers of the left breast and stomach. Breast cancer surgery was performed first, after that gastric cancer surgery was done, followed by hormone therapy with oral tamoxifen as postoperative adjuvant therapy. The gastric cancer has been observed without adjuvant chemotherapy because the patient has dementia.
Male breast cancer is relatively rare, accounting for only 1% of all breast cancers. This is the 8th reported case of male breast cancer developing simultaneously with gastric cancer, which is also rare. We report this case with discussion of the relevant literature.
