Yasumitsu Hirano

Influence of Anatomical Variations due to Horseshoe Kidney on Colorectal Cancer Surgery

Tetsuhiro Urashima, Yasuhiro Ishiyama, Sohei Akuta, Akihito Nakanishi et autres

BackgroundHorseshoe kidney is a rare renal fusion anomaly often associated with vascular and ureteral variations. Previous case reports have described technical considerations during colectomy in patients with horseshoe kidney. However, studies systematically evaluating the impact of anatomical anomalies associated with horseshoe kidney …

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Prognostic Impact of Circumferential Resection Margin in Minimally Invasive Surgery for Locally Advanced Rectal Cancer: A Multicenter Prospective Study

Atsushi Hamabe, Masaaki Ito, Shigeo Toda, Yusuke Suwa et autres

ABSTRACT Aim Circumferential resection margin (CRM) status is a well‐established prognostic factor in rectal cancer surgery; however, its long‐term oncological relevance has not been prospectively validated in Japan, where upfront surgery has long been widely used. This study assessed the prognostic impact …

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Prognostic value of D3 lymph node dissection and nutritional status in colorectal cancer patients aged 80 years and older

Yasuhiro Ishiyama, Yasumitsu Hirano, Sohei Akuta, Yume Minagawa et autres

PURPOSE: To evaluate the impact of D3 lymph node dissection and nutritional status on outcomes in patients aged ≥80 years with colorectal cancer. METHODS: We retrospectively analyzed patients aged ≥80 years who underwent curative resection for stage I-III colorectal cancer between April …

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Surgeon workload in supervised robotic colorectal surgery: a surgical task load index study

Yasuhiro Ishiyama, Yasumitsu Hirano, Sohei Akuta, Yume Minagawa et autres

BACKGROUND: Robot-assisted colorectal surgery (RAS) is increasingly adopted; however, surgeon workload during supervised training and its determinants remain unclear. METHODS: We conducted a single-center study combining a prospective surgical task load index (Surgical-TLX) assessment and a retrospective cohort analysis (October 2023-August 2025). …

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Comparative analysis of marginal profit between da Vinci SP and multi-port systems in colorectal cancer surgery: a single-center descriptive cost-accounting study

Katsuya Deguchi, Yasumitsu Hirano

Because fixed costs such as capital investment, lease-related expenses, and depreciation vary substantially according to institutional case volume, timing of platform introduction, and local accounting policy, direct cross-platform comparison based on total cost may be difficult to interpret in routine practice. This …

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449 Long-Term Role of Hair Follicle Stem Cells in Epidermal Wound Healing

Emi Inamura, Mika Watanabe, Yasumitsu Hirano, G Trajkovic et autres

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Risk factors for male sexual dysfunction after minimally invasive surgery for rectal cancer: a multicenter prospective subanalysis of the LANDMARC study

Tsubasa Sakurai, Tomohiro Yamaguchi, Masakatsu Numata, Takashi Sakamoto et autres

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Quality of life after laparoscopic surgery for very low rectal cancer: A sub‐analysis of the ultimate trial

Hiroki Hamamoto, Keitaro Tanaka, Yuichiro Tsukada, Jun Watanabe et autres

AIM: Laparoscopic low anterior resection is widely used for treating rectal cancer; however, postoperative complications frequently result in a marked deterioration in the patients' quality of life (QOL). This study aimed to investigate the trajectory of QOL recovery and identify the risk …

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Esophageal Lymphoepithelioma-like Carcinoma With a Remarkable Response to DCF Chemotherapy: A Case Report

Masatoshi Yoshizawa, Yutaka Miyawaki, Hiroshi Satō, Tomonori Kawasaki et autres

BACKGROUND/AIM: Esophageal lymphoepithelioma-like carcinoma (LELC) is an extremely rare malignancy with histological features resembling those of undifferentiated nasopharyngeal carcinoma. Owing to its rarity, no standard treatment protocol has been established. CASE REPORT: We report the case of a 76-year-old woman diagnosed with …

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Risk Factors for 30-day Mortality After Emergency Surgery for Non-occlusive Mesenteric Ischemia

Yume Minagawa, Yasuhiro Ishiyama, Manabu Amiki, Yasumitsu Hirano

Background/Aim: Non-occlusive mesenteric ischemia (NOMI) is a rare and highly fatal disease characterized by intestinal ischemia or necrosis despite the absence of obstruction of the mesenteric vessels. This research aimed to investigate the risk factors for 30-day mortality of NOMI after emergency …

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Evaluation of PINK1 protein expression as a predictive marker for the efficacy of adjuvant chemotherapy in colorectal cancer: a retrospective study

Takatsugu Fujii, Masataka Hirasaki, Yasuo Kamakura, Tomonori Kawasaki et autres

BACKGROUND: PTEN-induced kinase 1 (PINK1) is involved in mitochondrial quality control via mitophagy, and recent studies have reported that its overexpression is associated with chemoresistance and poor prognosis in multiple malignant tumors. However, the clinical significance of PINK1 expression in colorectal cancer …

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Primary Choriocarcinoma of Colon: Case Report and Literature Review

Naoto Okazaki, Akira Tanaka, Masanori Yasuda, Yasuko Hiraoka et autres

Primary colorectal choriocarcinoma is extremely rare with only 35 cases described in the literature during over 40 years. The neoplasm is characterized by biphasic tumor growth composed of adenocarcinomatous and choriocarcinomatous differentiation. Diagnostic elusiveness, aggressive nature and lack of established treatment make …

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