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Stomach and Esophageal Surgery

The Department of Stomach and Esophageal Surgery specializes in the diagnosis and surgical treatment of malignant diseases such as gastric and esophageal cancer, and benign diseases such as esophageal hiatal hernia. We also provide advanced surgical treatment for severe obesity.

Medical services

Supervising physicians and specialists affiliated with the Japan Surgical Society, the Japanese Society of Gastroenterological Surgery, the Japan Esophageal Society, and the Japanese Gastric Cancer Association provide highly professional treatment. Patients receive cutting-edge treatment from diagnosis to surgery and chemotherapy.

Diagnosis and treatment policy

We place the highest priority on the patient. Patients’ wishes regarding treatment decisions are confirmed and respected at all times. The most appropriate treatment method is selected by a group of specialists based on a careful review of the results of detailed and precise examinations, and patients are included in discussions about the selected method.

Specialized surgical procedures include:

Esophageal cancer

Based on our broad experience, we perform not only conventional esophagectomy with thoracotomy but robot assisted transmediastinal esophagectomy without thoracotomy that achieves radical cures while maintaining postoperative quality of life.

Gastric cancer

Striving to provide “body-friendly” treatment, we apply laparoscopic surgery techniques for cancers detected in the early stages.


Pre- and postoperative chemotherapy is used to increase the excision rate and improve the prognosis.

Target diseases

Gastric malignancy (gastric cancer, GIST, etc.), esophageal malignancy (esophageal cancer, malignant melanoma, sarcoma, etc.), emergency surgery for perforation, benign diseases such as inguinal and esophageal hiatal hernia, severe obesity.

Advanced treatments/ Specialized treatments

Esophageal cancer treatment

We perform robot-assisted transmediastinal esophagectomy without thoracotomy for the purpose of reducing postoperative complications and maintaining quality of life. Our robot-assisted esophagectomy shows shorter duration of hospital stay, lesser incidence of pneumonia and better quality of life compared with conventional esohpagectomy.

Gastric cancer treatment

With the goal of reducing the physical burden on patients, we apply laparoscopic or robot-assisted surgery techniques for gastric cancer and gastric GIST. We developed a new laparoscopy and endoscopy cooperative surgery technique (NEWS) and obtain good results.

Severe obesity

We apply laparoscopic sleeve gastrectomy for severely obese patients under insured health treatment.

Frequently performed tests and descriptions

Physical examinations such as blood, X-ray, ECG, respiratory function, endoscopy, CT, and PET-CT are performed as needed.

Yasuyuki Seto


Stomach and Esophageal Surgery, Breast and Endocrine Surgery


M.D. , Ph.D.


Upper GI surgery, Esophageal Cancer, Gastric Cancer

Research Interests

surgical procedure and oncology of esophageal and gastric cancer


Japanese and English

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Major diseases and numbers of inpatients treated

Disease name Number of inpatients
1 Esophageal cancer 237
2 Gastric cancer 379
3 Other gastroduodenal tumors 16
4 Hernia 76
5 Bleeding ulcers and perforation 10
6 Ileus (intestinal obstruction) 19
7 Appendicitis 14
8 Others 23


Areas of expertise, treatment and examination methods

  1. Esophageal cancer
  2. Gastric cancer
  3. Esophagogastric junction cancer
  4. Gastrointestinal stromal tumors (GISTs)
  5. Inguinal hernia
Treatment methods
  1. Esophagectomy(open, robotic, laparoscopic)
  2. Gastrectomy (open, laparoscopic)
  3. Non-exposed Endoscopic Wall-inversion Surgery (NEWS)
  4. Chemotherapy for esophageal and gastric cancer (neoadjuvant, and, for advanced and recurrent cases)
  5. Inguinal hernia
Examination methods
  1. Gastrointestinal endoscopy
  2. CT scan
  3. PET-CT scan

Numbers of operations and treatments performed in this department

Name of operation/treatment Number
1 Esophagectomy with thoracolaparotomy for esophageal cancer 40
2 Robot-assisted esophagectomy for esophageal cancer 10
3 Other operations and treatments for esophageal cancer 6
4 Laparotomy for gastric cancer and submucosal tumors 73
5 Laparoscopic surgeries for gastric cancer and submucosal tumors 48
6 Staging Laparoscopy In Gastric Cancer 24
7 Hernioplasty 80
8 Others (such as acute celiopathy surgery and surgical intervention for Ileus) 63


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