Department of Upper Gastrointestinal Surgery

Head of the Department: Kazuyuki Kojima, MD, PhD, F.A.C.S.

Message from the Head of the Department

     I am pleased to welcome you all to the official website of the Department of Upper Gastrointestinal Surgery, Dokkyo Medical University. We provide upper gastrointestinal, colorectal, and pediatric surgery and offer the highest level of surgical treatment by specialists in each field. As a high-volume center of surgical treatment, we offer treatment to patients not only from Tochigi Prefecture, but also from the northern parts of Kanto area.


  • Research on the safety of endoscopic submucosal injection of indocyanine green fluorescence imaging-guided robotic gastrectomy with lymphadenectomy for patients with gastric cancer (Supported by Dokkyo Medical University Research Grant / Research Encouragement Award)
  • Prospective clinical trial on intraoperative fluid amylase level measurement in gastric cancer surgery, prediction of the occurrence of postoperative pancreatic leakage (Joint clinical trial in collaboration with the Department of Pharmacology, University of Tokyo and the Department of Pharmacology of our university)
  • Studies on remnant gastritis and Helicobacter pylori infection after gastrectomy and carcinogenesis of the remnant stomach
  • Studies on efficacy of chemotherapy regimen for unresectable advanced / recurrent gastric cancer
  • Comparative study on long-term nutritional indicators using a reconstruction method for patients with gastric cancer surgery
  • Evaluation of short- and long-term outcomes of differences in reconstruction methods following laparoscopic proximal gastrectomy.
  • Establishment of splenic hilum dissection procedure in robot-assisted gastrectomy
  • Study on nutritional management and endocrine metabolism disorders in patients with intestinal dysfunction
  • Assessing changes in treatment policy toward evaluation of extremely low birth weight infants requiring abdominal surgery
  • Elucidating the usefulness of FDG-PET examination in esophageal cancer treatment
  • Evaluation of biomarkers for predicting postoperative complications of esophageal cancer
  • Reconstruction methodology following esophagectomy
  • Basic research on carcinogenesis and progression of esophageal cancer
  • Study on the outcomes of definitive chemoradiotherapy for elderly patients with esophageal cancer
  • Retrospective observational study on multidisciplinary treatment approach for colorectal cancer
  • Evaluating appropriate surgical treatment for ulcerative colitis
  • Educative programs in anatomy and clinical application of laparoscopic gastrointestinal surgery by cadaver surgical training (In collaboration with Department of Anatomy)
  • Research on stent graft insertion and surgery for aortic infiltrating esophageal cancer (Japan Esophageal Society)
  • Study on the usefulness of intraoperative recurrent laryngeal nerve monitoring for esophageal cancer surgery (Japan Esophageal Society)
  • Observational study on C-reactive protein (CRP) gene polymorphisms and esophageal cancer lymph node metastasis (Akita University)
  • Examination of the effects of minimally invasive surgery and anti-adhesion agents on the frequency of intestinal obstruction
  • Evaluating the usefulness of laparoscopic sleeve gastrectomy for morbid obesity (Dokkyo Diabetes Treatment Center)

3. Education
School of Medicine:

3rd year Lecture of surgery
4th year Symptomatology:Surgical disorders
5th year Clinical Clerkship
6th year Clinical Clerkship

Research Field

1. Surgery
      Recent advances in surgery have been remarkable. Endoscopic surgery (laparoscopic surgery) has been introduced for a number of diseases that were previously performed by open surgery. In our department, laparoscopic surgery is carried out as the standard surgery for gastric and colorectal cancers. We also perform several robotic surgeries. Thoracoscopic surgery for esophageal cancer is also undertaken. Additionally, extended surgeries in collaboration with other clinical departments for advanced cancers that are not normally targeted for surgery are also considered. We aim to verify the outcomes of these surgeries and make efforts to further improve the procedures.
2. Adjuvant therapy (chemotherapy, radiation therapy)
As our department mainly provides surgical treatments for cancers, we also offer chemotherapy and radiation therapies. These treatments are administered to patients who are not eligible for surgical treatment. By unveiling the results of these treatment methods, it becomes possible to widely disseminate the information, such as what kind of treatment would be appropriate for a particular patient. It is also possible to propose new treatment methods based on these results. We will actively thrive to introduce newly developed drugs and new combinations of treatment methods, and do our utmost to support patients and enable them have a better quality of life.

Academic Society Activities

Japan Surgical Society
The Japanese Society of Gastroenterological Surgery
Japan Society for Endoscopic Surgery
Japanese Gastric Cancer Association
The Japan Esophageal Society
Japan Society of Clinical Oncology
The Japan Society of Coloproctology
Japanese Cancer Association
The Japanese Society of Pediatric Surgeons
Japan Surgical Association
Japanese Society for Cancer of the Colon and Rectum
Japanese Society for Gastro-surgical Pathophysiology
Association for Kanto Laparoscopic Gastrectomy
Japanese College of Surgeons
The Japanese Society of Gastroenterology
The Japanese Gastroenterological Associations
Japan Gastroenterological Endoscopy Associations
Japanese Society for Abdominal Emergency Medicine
Japanese Society of Pediatric Radiology
The Japanese Association for Thoracic Surgery
Japanese Board of Cancer Therapy
Japanese Society for Clinical Nutrition and Metabolism
Japanese Society for Thermal Medicine
Japanese Society for Computer Aided Surgery
Japanese Society for Pediatric Urology
Japan Society of Perinatal and Neonatal Medicine
Japan Society of Pediatric Hematology / Oncology
Japanese Society for Quality and Safety in Healthcare
American College of Surgeons
American Society of Clinical Oncology
International Gastric Cancer Association
Society of American Gastrointestinal and Endoscopic Surgeons
European Association of Endoscopic Surgery
International Association of Surgeons Gastroenterologists and Oncologists
International Society of University Colon and Rectal Surgeons


Head/Professor and Chairman Kazuyuki Kojima, MD, PhD, F.A.C.S.
Staff/Professor Takatoshi Nakamura, MD, PhD
Staff/Associate Professor Masanobu Nakajima, MD, PhD, F.A.C.S.
Staff/Associate Professor Shinji Morita, MD, PhD
Staff/Associate Professor Kan Suzuki, MD, PhD
Staff/Senior Assistant Professor (Nikko Medical Center) Hideo Ogata, MD, PhD
Staff/Senior Assistant Professor Masatoshi Nakagawa, MD, PhD
Staff/Senior Assistant Professor Hiroto Muroi, MD, PhD
Staff/Senior Assistant Professor Takeshi Yamaguchi, MD, PhD
Staff/Senior Assistant Professor Yukiko Tani, (Japanese Red Cross Medical Center),MD, PhD
Staff/Senior Assistant Professor Keisuke Ihara, MD, PhD
Staff/Assistant Professor Kei Ogino (Tokyo Medical and Dental University) MD, PhD
Staff/Assistant Professor Eigo Kurayama, (Nikko Medical Center), MD
Staff/Assistant Professor Maiko Kikuchi, MD, PhD
Staff/Assistant Professor Tsukasa Kubo, MD
Staff/Assistant Professor Junki Fujita, MD
Staff/Assistant Professor Shotaro Matsudera, MD, PhD
Staff/Assistant Professor Shun Watanabe MD
Staff/Assistant Professor Shuhei Takise, MD
Staff/Assistant Professor Masashi Takayanagi, MD
Staff/Assistant Professor Ritsuto Akutsu (Saiseikai Utunomiya Hospital), MD
Staff/Assistant Professor Noboru Inoue (NHO Utunomiya Hospital), MD
Staff/Assistant Professor Takahiro Kono (Yuai Memorial Hospital), MD

In addition, the First Department of Surgery has residential and part-time staff, and secretaries.

Characteristics of the section

     In our department, with the keyword "minimally invasive surgery (MIS),”in addition to performing safe and reliable surgery with low complications, we expect highly accurate surgery by actively incorporating endoscopic surgery.
      We have introduced robotic surgery using the Da Vinci Xi system. In every area, we have established a system that can offer surgical treatments as per patient’s wish, with focus on minimally invasive surgery.
      In addition to aggressively performing highly curative surgery for advanced cancers, we also actively provide multidisciplinary treatment combined with chemotherapy and radiation therapy as per the medical condition of individual patient. We are also focusing on training gastrointestinal and pediatric surgeons who will lead the next generation as well as aim to train surgeons with high technology toward performing safe and successful surgeries. All doctors strive to meet the expectations of patients by providing the best surgical treatment, and eventually satisfy them.


Department of Upper Gastrointestinal Surgery
Dokkyo Medical University
Kitakobayashi 880, Mibu, Shimotsuga, Tochigi, 321-0293 Japan
See more details → Japanese)