Publications by authors named "Okabayashi K"

Background: Peritoneal metastasis, a major complication of colorectal cancer (CRC), often leads to poor quality of life and unfavorable outcomes. Despite numerous studies characterizing its biological features in CRC, intratumor heterogeneity and interactions between cancer cells and tumor microenvironment cells remain poorly understood.

Methods: To explore these aspects, we performed single-cell transcriptome analysis of matched primary tumor and peritoneal metastasis samples from a treatment-naïve patient.

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Purpose: Adjuvant chemotherapy (AC) for stage III disease is recognized as a standard treatment and is routinely performed in patients with colon cancer (CC). However, the recommendation for AC is mainly based on studies performed in past environments, where D3 lymphadenectomy was not routinely performed.

Methods: We retrospectively analyzed CC patients who underwent curative resection with D3 lymphadenectomy in Keio Surveillance Epidemiology and End Results (K-SEER) database.

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Article Synopsis
  • The study investigates the safety and effectiveness of endoscopic submucosal dissection (ESD) for colorectal and gastric cancers, focusing on predicting resectability using endoscopic ultrasound (EUS).
  • EUS classifications for tumors were established, determining how visible the submucosal layer was, and the findings showed a significant correlation with the pathological results following ESD.
  • The results indicated that EUS could be crucial in predicting which tumors are likely to be successfully resected, with higher success rates observed in Type I tumors compared to Type II and III.
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Aim: Serum cholinesterase (ChE) levels are considered to reflect nutritional status. Although ChE has been well documented as a prognostic factor for some cancers, no clear consensus on its use for colorectal cancer (CRC) has been reached. The aim of this study was to investigate the relationship between preoperative serum ChE and postoperative long-term prognosis in CRC patients.

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Lung metastasis is the second most common type of metastasis in colorectal cancer. Specific treatments for lung metastasis have not been developed since the underlying mechanisms are poorly understood. The present study aimed to elucidate the molecular basis of lung metastasis in colorectal cancer.

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Background: The potential benefits of robotic-assisted compared with laparoscopic surgery for locally advanced cancer have not been sufficiently proven by prospective studies. One factor is speculated to be the lack of strict surgeon criteria. The aim of this study was to assess outcomes for robotic surgery in patients with locally advanced rectal cancer with strict surgeon experience criteria.

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Background: In patients with colorectal cancer, both the C-reactive protein-to-albumin ratio and comprehensive risk score of the estimation of physiologic ability and surgical stress have demonstrated prognostic significance.

Objective: To assess the clinical value of the combined use of C-reactive protein-to-albumin ratio and comprehensive risk score for predicting prognosis in patients with colorectal cancer.

Design: Multicenter retrospective study.

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A 79-year-old woman developed herpes zoster ophthalmicus (HZO) with a vesicular rash on the nasal root, which developed soon after intravenous acyclovir therapy. Although varicella zoster virus DNA was undetectable in the cerebrospinal fluid, she presented with ophthalmoplegia without optic nerve dysfunction 32 days after the onset of HZO. We diagnosed the patient with superior orbital fissure syndrome and administered intravenous immunoglobulin and systemic corticosteroids.

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Colorectal mucinous adenocarcinoma (MAC) is one of the most lethal histological types of colorectal cancer, and its mechanism of development is not well understood. In this study, we aimed to clarify the molecular characteristics of MAC via in silico analysis using The Cancer Genome Atlas database. The expression of genes on chromosome 20q (Chr20q) was negatively associated with the expression of MUC2, which is a key molecule that can be used to distinguish between MAC and nonmucinous adenocarcinoma (NMAC).

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In addition to treatment with antituberculosis drugs, complete surgical excision is important for the cure of chest wall tuberculosis. However, surgery is often challenging to perform due to different factors such as the strong adhesion of tuberculous lesions to the surrounding normal tissue, growth of neovascularization and presence of fragile necrotic tissues. Firm adhesions, bleeding and fragile tissue make it difficult to determine the boundary with normal tissue and completely excide the lesion.

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Mechanoresponsive materials have been studied to visualize and measure stresses in various fields. However, the high-sensitive and spatiotemporal imaging remain a challenging issue. In particular, the time evolutional responsiveness is not easily integrated in mechanoresponsive materials.

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Article Synopsis
  • The study investigates the differences in histological features between colitis-associated intestinal cancer (CAC) and sporadic colorectal cancer (CRC) in patients with inflammatory bowel disease.
  • Data from a national database in Japan covering over 36 years was used to analyze 1,077 cases of ulcerative colitis-related CAC and 297 cases related to Crohn’s disease, alongside a large cohort of sporadic CRC patients.
  • Findings reveal that CAC exhibits a higher prevalence of aggressive cancer types compared to sporadic CRC, with this difference becoming more prominent as the tumors progress.
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Background: Transanal drainage tube (TDT) is used to prevent anastomotic leakage after surgery for rectal cancer. However, it remains unclear whether intraoperative TDT placement is also useful in preventing anastomotic leakage after ileal pouch-anal or ileal pouch-anal canal anastomosis (IPAA) in patients with ulcerative colitis (UC). This study aimed to evaluate the efficacy of intraoperative TDT placement in preventing anastomotic leakage after IPAA in patients with UC.

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Aim: As associations between oral function and general health have been reported in community-dwelling older adults, easily implementable preventive measures are urgently required. We focused on the health benefits of gum chewing, as no studies have been carried out on the impact of gum-chewing routines on the health of older adults. This cross-sectional study aimed to determine whether the gum-chewing routine is associated with oral, physical and cognitive functions in community-dwelling older adults.

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A 70-year-old woman with advanced endometrial cancer developed right ptosis and muscle weakness in the right quadriceps after pembrolizumab administration. Serum creatine kinase (CK) levels were elevated, and anti-striated muscle antibodies were positive. On magnetic resonance imaging, the right vastus lateral muscle showed an abnormal signal.

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We share our experiences of instructing three patients with severe upper limb dysfunction on how to self-adjust CPAP/NPPV masks. In Case 1, we simplified the procedure by suturing a part of the headband as the left forearm was amputated. In Case 2, the patient had congenitally short limbs with short stature; thus, we provided an additional belt to the headband to maintain the headband's configuration while wearing the mask.

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Objective: To create a recurrence prediction value (RPV) of high-risk factor and identify the patients with high risk of cancer recurrence.

Background: There are several high-risk factors known to lead to poor outcomes. Weighting each high-risk factor based on their association with increased risk of cancer recurrence can provide a more precise understanding of risk of recurrence.

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Background: It is unclear how early- and delayed-onset organ/space surgical site infections (SSIs) affect the long-term prognosis of patients with colorectal cancer, who are potential candidates for adjuvant chemotherapy. This study aimed to investigate the association between the timing of SSI onset and clinical outcome.

Methods: This retrospective, multicenter cohort study evaluated patients who were diagnosed with high-risk stage II or III colorectal cancer and underwent elective surgery between 2010 and 2020.

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Article Synopsis
  • Osteopenia, which is lower than normal bone mineral density, negatively affects healthy life expectancy and is linked to worse outcomes in colorectal cancer patients.
  • A study involving 1,086 patients found that those with preoperative osteopenia had significantly lower 5-year overall survival, disease-specific survival, and recurrence-free survival rates compared to those without osteopenia.
  • Despite limitations like being a single-institution study, the findings suggest that preoperative osteopenia may serve as a reliable indicator for predicting long-term prognosis in colorectal cancer patients.*
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  • Surgical site infections (SSIs) are common in surgery patients, and this trial aims to compare the effectiveness of olanexidine and chlorhexidine-alcohol in reducing SSI rates during clean-contaminated gastrointestinal surgeries.
  • The trial will involve patients under 18 years old and assess various outcomes, including overall SSI rates and any adverse reactions to the antiseptics over a 30-day postoperative period.
  • The study has received ethical approval and began participant recruitment in January 2023, with the results expected to be published in medical journals following peer review.
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Most cases of intractable pneumothorax are complicated by underlying lung diseases, which lead to poor intrathoracic conditions. Therefore, the treatment becomes even more challenging, and standard surgical techniques cannot always be applied to treat pneumothorax. We report a novel surgical technique using polyglycolic acid mesh and fibrin glue for intractable pneumothorax, named the mille feuille method.

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