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K. Obama · SciRah

Researcher profile · Semantic Scholar

K. Obama

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K. Obama — researcher profile on SciRah

h-index: 34
Works: 327
Citations: 4,294

Most-cited papers

Targeting Asparagine Metabolism in Solid Tumors
Keita Hanada, Kenji Kawada, K. Obama
2025Nutrients19 citations Open access
Semantic Scholar
Targeting fibroblast derived thrombospondin 2 disrupts an immune-exclusionary environment at the tumor front in colorectal cancer
Kosuke Iwane, Y. Nakanishi, Yu Muta, Jia-Yu Chen +34 more
2025Nature Communications16 citations Open access
Semantic Scholar
Epithelial Regnase-1 inhibits colorectal tumor growth by regulating IL-17 signaling via degradation of NFKBIZ mRNA
E. Iguchi, Atsushi Takai, Natsumi Oe, Yosuke Fujii +11 more
2025Proceedings of the National Academy of Sciences of the United States of America10 citations Open access
Semantic Scholar
Short- and Long-term Outcomes of Robotic versus Conventional Minimally Invasive Esophagectomy for Esophageal Cancer: A Multicenter Propensity Score-matched Cohort Study
Shigeru Tsunoda, H. Hosogi, Shohei Matsufuji, Y. Yoda +9 more
2026Annals of Surgical Oncology7 citations Open access
Semantic Scholar
Artificial intelligence-supported system of surgical anatomy recognition may facilitate the understanding of gastrointestinal surgery for medical students
Shintaro Okumura, Shigeru Tsunoda, S. Hisamori, Shoichi Kitano +12 more
2025Surgical Endoscopy5 citations Open access
Semantic Scholar
The Involvement of Oral Pathogenic Bacteria, Fusobacterium nucleatum Subspecies animalis in the Pathogenesis of Human Esophageal Adenocarcinoma
Taku Kitano, Shintaro Okumura, Tomonori Matsumoto, Shigeru Tsunoda +3 more
2025Gastro Hep Advances5 citations Open access
Semantic Scholar
Initial Clinical Experience of Robot-Assisted Rectal Surgery by Using Hugo RAS System: Horizontal Line Port Placement With Contralateral Reserve Arm Manipulation.
Yoshiro Itatani, K. Hida, R. Okamura, Hisatsugu Maekawa +9 more
2025Asian Journal of Endoscopic Surgery5 citations
Semantic Scholar
First Annual Report for Robot‐Assisted Surgery Based on the National Clinical Database 2019 in Japan: Report on Three Major Gastrointestinal Fields
I. Takemasa, Hiroyuki Yamamoto, T. Nishigori, Takeo Fujita +16 more
2026Asian Journal of Endoscopic Surgery4 citations
Semantic Scholar
Robot-Assisted Total Proctocolectomy for Familial Adenomatous Polyposis with Multiple Colorectal Cancers Using the Hugo RAS System
Yu Yoshida, Y. Aisu, Yoshiro Itatani, K. Hida +10 more
2025Surgery Case Reports4 citations Open access
Semantic Scholar
Precision Oncology Framework Using Circulating Tumor Cells
Fumihiko Kakizaki, Kyoichi Oshiro, Y. Enoki, Kana Kawanishi +7 more
2025International Journal of Molecular Sciences4 citations
Semantic Scholar
Mediastinoscopy-Assisted Esophagectomy as an Effective Treatment for IgG4-Related Esophageal Stenosis: A Case Report
M. Sakaguchi, Shigeru Tsunoda, Mitsuhiro Nikaido, Yuki Teramoto +16 more
2025Surgery Case Reports3 citations Open access
Semantic Scholar
Impact of articulating laparoscopic instrument–assisted gastrectomy with D2 lymphadenectomy on perioperative and oncologic outcomes compared with conventional laparoscopy: a propensity score matching analysis
S. Choi, T. Kinoshita, K. Obama, Katsunobu Sakurai +4 more
2025Surgical Endoscopy3 citations
Semantic Scholar
Cervical‐First Approach in Thoracoscopic Esophagectomy With Intraoperative Nerve Monitoring for an Esophageal Cancer Patient With Aberrant Right Subclavian Artery
M. Mochizuki, Shigeru Tsunoda, Shintaro Okumura, T. Nishigori +10 more
2025Asian Journal of Endoscopic Surgery3 citations
Semantic Scholar
Transanal drainage tube placement in patients with temporary ileostomy after laparoscopic rectal resection for rectal cancer
N. Hoshino, K. Hida, Y. Tsukada, K. Obama +26 more
2026Updates in Surgery2 citations
Semantic Scholar
Robot‐Assisted Distal Pancreatectomy Using the Hugo RAS System via the Supragastric Approach: First Nationwide Case Report (With Video)
Kazuyuki Nagai, K. Yamane, A. Sato, H. Nishino +9 more
2026Asian Journal of Endoscopic Surgery2 citations Open access
Semantic Scholar
Safety and efficacy of preoperative chemotherapy for obstructive colon cancer with endoscopic stenting: SUCCEED study.
Ryosuke Mizuno, Rei Mizuno, R. Okamura, Ryo Takahashi +20 more
2026Future Oncology2 citations Open access
Semantic Scholar
Perioperative changes in the quality of life and the impact of preoperative quality of life on the time to return to work after surgery among patients with colorectal cancer: a prospective, multicenter, cohort study
Yusuke Fujita, K. Hida, T. Nishigori, Shinya Hamasu +5 more
2025Surgery today (Print)2 citations
Semantic Scholar
Automatic segmentation of male pelvic floor soft tissue structures for anatomical simulation and morphological assessment in lower rectal cancer surgery
Y. Aisu, T. Okada, Y. Itatani, A. Masuo +6 more
2025Techniques in Coloproctology2 citations Open access
Semantic Scholar
Refining the Feasibility of Machine‐Learning‐Based Diagnostic Model Utilizing Gut Microbiota Analysis for Colorectal Cancer Screening
Shintaro Okumura, Yusuke Konishi, Taku Kitano, Tomonori Matsumoto +3 more
2025Cancer Medicine2 citations Open access
Semantic Scholar
Minimally invasive salvage esophagectomy following definitive chemoradiotherapy for esophageal cancer.
Shigeru Tsunoda, T. Nishigori, Shintaro Okumura, S. Hisamori +5 more
2026Diseases of the esophagus1 citations
Semantic Scholar
Clinical Implications of Nutritional Intake in Patients With Esophageal Squamous Cell Carcinoma Receiving Chemoradiotherapy and Neoadjuvant Chemotherapy
Y. Tamai, Atsushi Yamada, C. Katada, Masashi Tamaoki +12 more
2026Cancer Medicine1 citations Open access
Semantic Scholar
Time use, unpaid care work, and income: a nationwide cross-sectional web survey of gender gaps among hospital physicians in Japan
Kae Okoshi, Yukinari Tokoro, Kayo Fukami, K. Hida +3 more
2026BMC Health Services Research1 citations Open access
Semantic Scholar
Impact of Postoperative Infectious Complications on Long‐Term Survival After Curative Resection for Colorectal Cancer: A Multicenter Study in the Minimally Invasive Era
Takehito Yamamoto, Ryosuke Mizuno, Yoshiro Itatani, Tetsuya Shiota +4 more
2026Annals of Gastroenterological Surgery1 citations Open access
Semantic Scholar
Factors Associated With Pass-Fail Outcomes in the Colorectal Endoscopic Surgical Skill Qualification Examination: A Retrospective Observational Study Using Data From 2020 to 2024.
Suguru Hasegawa, H. Kuroyanagi, Junichiro Kawamura, Yusuke Kinugasa +2 more
2026Asian Journal of Endoscopic Surgery1 citations Open access
Semantic Scholar
Second recurrence after R0 resection of recurrent colorectal cancer: patterns and implications for surveillance.
Haruku Fujita, R. Okamura, Ben Sasaki, Nobu Oshima +8 more
2026International Journal of Clinical Oncology1 citations
Semantic Scholar
Comparison of Minimally Invasive Colectomy Between Intra‐ Versus Extra‐Corporeal Anastomosis Technique (COMMIT Study): Mid‐Term Analysis
Takuya Takami, Takehito Yamamoto, Yoshiro Itatani, Ryosuke Mizuno +6 more
2026Annals of Gastroenterological Surgery1 citations Open access
Semantic Scholar
How do Japanese medical students use social media? A large multicenter survey of platform preferences and career decision-making
Takehito Yamamoto, K. Hida, Shin Ishihara, Soichi Murakami +7 more
2026Surgery today (Print)1 citations Open access
Semantic Scholar
Feeding Duodenostomy Tube Placement After Minimally Invasive Esophagectomy with Posterior Mediastinal Reconstruction.
Hiromitsu Kinoshita, Shigeru Tsunoda, T. Nishigori, Shintaro Okumura +4 more
2026Annals of Surgical Oncology1 citations
Semantic Scholar
Clinical advantages of robotic gastrectomy for gastric cancer over conventional laparoscopic approach: a retrospective cohort study using a nationwide registry database in Japan
Susumu Shibasaki, H. Endo, Hiroyuki Yamamoto, Masaya Nakauchi +9 more
2026Gastric Cancer1 citations
Semantic Scholar
Revisiting the anatomical relationship between the middle colic artery and the middle colic vein for complete mesocolic excision in colon cancer surgery
Takehito Yamamoto, M. Fukuda, Yoshihisa Okuchi, Hisatsugu Maekawa +9 more
2026Surgery today (Print)1 citations
Semantic Scholar
Treatment resistance factors associated with Talaporfin sodium photodynamic therapy for local control after chemoradiotherapy for esophageal cancer
Masashi Tamaoki, Akira Yokoyama, C. Katada, K. Hirohashi +15 more
2026Esophagus1 citations Open access
Semantic Scholar
Association of Perioperative Vasodilator Therapy and Mortality in Nonocclusive Mesenteric Ischemia.
Takuya Takami, Kayoko Mizuno, K. Obama, Koji Kawakami
2025Journal of Surgical Research1 citations
Semantic Scholar
Single-incision plus one robot-assisted surgery (SIPORS) using the Hugo robotic-assisted surgery (RAS) system for rectal cancer
Yu Yoshida, Yoshiro Itatani, Takehito Yamamoto, R. Okamura +2 more
2025Annals of Coloproctology1 citations Open access
Semantic Scholar
Management of anastomotic leakage following low anterior resection with double-stapling anastomosis.
Kenji Kawada, Yoshiro Itatani, K. Obama
2025Journal of Gastrointestinal Surgery1 citations
Semantic Scholar
Efficacy and safety of oral 5‐FU‐based adjuvant chemotherapy for geriatric patients with colorectal cancer: Integrated analysis of seven clinical trials conducted at the Japanese Foundation for Multidisciplinary Treatment of Cancer
N. Hoshino, M. Kanda, Koji Oba, Toru Aoyama +10 more
2025Colorectal Disease1 citations Open access
Semantic Scholar
Pre- and Post-Operative Exercise and Nutrition Therapy in Patients with Esophageal Cancer Undergoing Esophagectomy: A Prospective Interventional Study
Kohei Ueno, T. Nishigori, Shinya Yoshida, K. Hida +16 more
2025Annals of Nutrition and Metabolism1 citations Open access
Semantic Scholar
Prophylactic negative pressure wound therapy with Prevena™ to prevent perineal surgical site infection
Ryo Ohno, Gumpei Yoshimatsu, Yoshiro Itatani, R. Okamura +6 more
2025Surgery today (Print)1 citations
Semantic Scholar
Surgical trend including minimally invasive surgeries for ulcerative colitis in the COSUC study: the largest multicenter cohort study in Japan
K. Hida, Yoshiki Okita, Yusuke Fujii, Toru Miyake +52 more
2025Surgical Endoscopy1 citations Open access
Semantic Scholar
Enhanced recovery after laparoscopic distal gastrectomy using articulating laparoscopic instruments in older adults with gastric cancer: a retrospective analysis of prospectively collected data
S. Choi, T. Kinoshita, K. Obama, Katsunobu Sakurai +4 more
2025Annals of Surgical Treatment and Research1 citations
Semantic Scholar
Long-term outcomes and patterns of recurrence in mucinous rectal adenocarcinoma: A KCRG multicenter study.
T. Kozu, R. Okamura, T. Okada, Rei Mizuno +16 more
2026Journal of Clinical Oncology0 citations
Semantic Scholar
Postoperative Venous Thromboembolism after Minimally Invasive Esophagectomy Detected by Routine Contrast-Enhanced CT: A Single-Center Cohort Study
Hideyuki Masui, Shigeru Tsunoda, Shintaro Okumura, T. Sakamoto +4 more
2026Journal of Gastrointestinal Surgery Open0 citations Open access
Semantic Scholar
Impact of Perianal Inflammatory Lesions in Crohn's Disease Patients with Anorectal Cancer
N. Hoshino, K. Hida, K. Obama, Yusuke Fujii +5 more
2026Journal of the Anus Rectum and Colon0 citations Open access
Semantic Scholar
Potential overtreatment in MRI-defined low-risk locally advanced rectal cancer in the era of neoadjuvant therapy: An international cohort study.
R. Okamura, Seung-Ho Song, Y. Aisu, Takehito Yamamoto +8 more
2026Journal of Clinical Oncology0 citations
Semantic Scholar
Robotic Hepatectomy Using the Hugo RAS System: Initial Experience and Technical Considerations.
Katsunori Sakamoto, H. Nishino, T. Yoh, H. Kojima +17 more
2026Asian Journal of Endoscopic Surgery0 citations Open access
Semantic Scholar
Item-Level Scoring Profiles and Technical Domains in the Colorectal Endoscopic Surgical Skill Qualification Examination.
Suguru Hasegawa, H. Kuroyanagi, Junichiro Kawamura, Yusuke Kinugasa +2 more
2026Asian Journal of Endoscopic Surgery0 citations Open access
Semantic Scholar
Extent of Lymphadenectomy in Esophageal Cancer Surgery: Unresolved Issues in Prophylactic 3-Field Dissection.
Shigeru Tsunoda, M. Sakaguchi, Shintaro Okumura, Shoichi Kitano +1 more
2026Journal of chest surgery0 citations Open access
Semantic Scholar
P1.160. Role of Minimally Invasive Esophagectomy in Multidisciplinary Treatment for T4b Cervical Esophageal Cancer
M. Sakaguchi, Shigeru Tsunoda, Shintaro Okumura, Yusuke Fujii +9 more
2026Diseases of the esophagus0 citations Open access
Semantic Scholar
Single Incision Plus One Robot-Assisted Surgery With Hugo RAS System for Right-Sided Colon Cancer.
Takehito Yamamoto, Yoshiro Itatani, Ryuhei Aoyama, Yu Yoshida +4 more
2026Diseases of the Colon & Rectum0 citations
Semantic Scholar
ASO Author Reflections: Clinical Implications of Robot-Assisted Minimally Invasive Esophagectomy with Upper Mediastinal Dissection: Reduced Recurrent Laryngeal Nerve Palsy with Comparable Long-Term Outcomes.
Shigeru Tsunoda, K. Obama
2026Annals of Surgical Oncology0 citations
Semantic Scholar
Safe introduction of hinotori™ for robot-assisted minimally invasive esophagectomy as the second robotic system
Shintaro Okumura, Shoichi Kitano, Shigeru Tsunoda, M. Sakaguchi +7 more
2026Surgical Endoscopy0 citations Open access
Semantic Scholar

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K. Hida×19
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K. Hida — researcher profile on SciRah
Yoshiro Itatani×17
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Yoshiro Itatani — researcher profile on SciRah
Shigeru Tsunoda×16
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Shigeru Tsunoda — researcher profile on SciRah
R. Okamura×15
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R. Okamura — researcher profile on SciRah

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S. Hisamori — researcher profile on SciRah

Shintaro Okumura×12

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Shintaro Okumura — researcher profile on SciRah

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N. Hoshino — researcher profile on SciRah

T. Nishigori×10

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T. Nishigori — researcher profile on SciRah

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Yu Yoshida — researcher profile on SciRah

M. Sakaguchi×7

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M. Sakaguchi — researcher profile on SciRah

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T. Sakamoto — researcher profile on SciRah

Hisatsugu Maekawa×7

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Hisatsugu Maekawa — researcher profile on SciRah