Publications by authors named "Nihei K"

Background: Lymphovascular invasion (LVI) or pT1b is noncurative after endoscopic resection (ER) for esophageal squamous cell carcinoma (ESCC), and therefore surgery or chemoradiotherapy (CRT) is recommended. However, there has been debate regarding which treatment has better outcomes and whether individual risks should be considered.

Methods: This was a multicenter, retrospective study conducted at 65 hospitals in Japan.

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A comprehensive LC-MS study examined the venom components of the solitary scoliid wasp . Online mass fingerprinting showed that crude venom contains 25 small molecules (amino acids, biogenic amines, and nucleosides/nucleotides) and 45 peptides with MW 400-2700. The small molecules were identified by elemental composition analysis, and peptide sequences were determined by ESI-MS/MS and MALDI-TOF/TOF MS analyses.

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Article Synopsis
  • SBRT (Stereotactic body radiation therapy) is shown to be less invasive and more cost-effective compared to surgery for treating operable stage I non-small cell lung cancer (NSCLC) in Japan.
  • In a study, SBRT resulted in lower treatment costs by about $4,444 and improved quality-adjusted life years (QALYs) by 0.131 compared to surgery, with an overall survival rate of 78.2% versus 74.8%.
  • The findings suggest SBRT is a preferred treatment option, but further large-scale studies are necessary to confirm these results.
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Wheat (Triticum aestivum) is a major staple crop worldwide, and its yields are significantly threatened by wheat powdery mildew (Blumeria graminis f. sp. tritici).

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Background: Neutron beams utilized for performing BNCT are composed of a mixture of neutrons and gamma rays. Although much of the dose delivered to the cancer cells comes from the high LET particles produced by the boron neutron capture reaction, the dose delivered to the healthy tissues from unwanted gamma rays cannot be ignored. With the increase in the number of accelerators for BNCT, a detector system that is capable of measuring gamma ray dose in a mixed neutron/gamma irradiation field is crucial.

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This study aimed to identify the required capabilities and workload of medical staff in accelerator-based boron neutron capture therapy (BNCT). From August to September 2022, a questionnaire related to the capabilities and workload in the accelerator-based BNCT was administered to 12 physicians, 7 medical physicists and 7 radiological technologists engaged in BNCT and 6 other medical physicists who were not engaged in BNCT to compare the results acquired by those engaged in BNCT. Only 6-21% of patients referred for BNCT received it.

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Article Synopsis
  • The study looked at a new treatment called BNCT for patients with laryngeal cancer who still had problems after getting radiation therapy and wanted to keep their voice.
  • 15 patients were treated with BNCT, and they all had surgeries to help with breathing before the treatment, just in case there were side effects.
  • Almost all patients (93.3%) showed positive results after 3 months, but some had temporary swelling in their throat, which usually got better within a week.
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Purpose: Since June 2020, boron neutron capture therapy (BNCT) has been a health care service covered by health insurance in Japan to treat locally advanced or recurrent unresectable head and neck cancers. Therefore, we aimed to assess the clinical outcomes of BNCT as a health insurance treatment and explore its role among the standard treatment modalities for head and neck cancers.

Materials And Methods: We retrospectively analyzed data from patients who were treated using BNCT at Kansai BNCT Medical Center, Osaka Medical and Pharmaceutical University, between June 2020 and May 2022.

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Background: Monte Carlo simulation code is commonly used for the dose calculation of boron neutron capture therapy. In the past, dose calculation was performed assuming a homogeneous mass density and elemental composition inside the tissue, regardless of the patient's age or sex. Studies have shown that the mass density varies with patient to patient, particularly for those that have undergone surgery or radiotherapy.

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Background: The aim of this multi-institutional phase II study was to confirm the safety and the potential efficacy of moderately hypofractionated intensity-modulated radiotherapy (IMRT) with prostate-based image-guidance for Japanese patients.

Methods: Patients with low- or intermediate-risk localized prostate cancer were eligible. Patients with a part of high risk (having only one of the following factors, cT3a, 20 < PSA ≤ 30, or GS = 8 or 9) were also included.

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Background: This study was conducted to evaluate the real-world safety and efficacy of boron neutron capture therapy (BNCT) with borofalan(B) in Japanese patients with locally advanced or locally recurrent head and neck cancer (LA/LR-HNC).

Methods: This prospective, multicenter observational study was initiated in Japan in May 2020 and enrolled all patients who received borofalan(B) as directed by regulatory authorities. Patient enrollment continued until at least 150 patients were enrolled, and adverse events attributable to drugs, treatment devices, and BNCT were evaluated.

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α-Fetoprotein (AFP)-producing gastric carcinoma (GC) (AFPGC) is a special subtype of GC that is clinically characterized by a high incidence of liver metastasis and poor prognosis. The present study reported the case of a patient with AFPGC who showed complete response (CR) after stereotactic body radiotherapy (SBRT) for liver metastasis. A 76-year-old male patient underwent total gastrectomy with D2 lymph node dissection for GC.

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Background: The out-of-field radiation dose for boron neutron capture therapy (BNCT), which results from both neutrons and γ-rays, has not been extensively evaluated. To safely perform BNCT, the neutron and γ-ray distributions inside the treatment room and the whole-body dose should be evaluated during commissioning. Although, certain previous studies have evaluated the whole-body dose in the clinical research phase, no institution providing BNCT covered by health insurance has yet validated the neutron distribution inside the room and the whole-body dose.

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Article Synopsis
  • Surgery is the standard treatment for stage I non-small cell lung cancer (NSCLC), but there's limited evidence on whether it's better than stereotactic body radiotherapy (SBRT) for survival.
  • A study analyzed data from 399 operable stage I NSCLC patients in Japan to assess the real-world outcomes of SBRT, noting a median follow-up of 38 months and various survival rates based on cancer subtype and patient characteristics.
  • Results showed an overall 3-year survival rate of 77%, with female patients doing better than males, highlighting SBRT's potential as a viable treatment option for older patients with stage I NSCLC and guiding shared decision-making in their care.
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In general, mushroom-forming fungi secrete liquid on the surface of mycelia just before fruiting-body formation. However, no researchers in mushroom science have paid attention to the liquid until now. We formulated a hypothesis that the liquid plays an important role(s) in the formation of the fruiting body and produces various bioactive compounds and named it the "fruiting liquid (FL)".

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Kochi Oxydol Radiation Therapy for Unresectable Carcinoma (KORTUC) is a novel radiosensitizer invented by Professor Ogawa at Kochi University (Japan) in 2006. The current study aimed to report the experience of the present authors with the use of KORTUC treatment in combination with interstitial brachytherapy (ISBT), with or without external beam (EB) radiotherapy (RT), in patients with locally recurrent cervical cancer (LRCC), who were likely to have a high risk of poor prognosis. Between April 2012 and January 2020, 14 female patients (15 tumoral lesions) with LRCC underwent KORTUC with ISBT.

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Introduction: Splenectomy for proximal gastric cancer was found to offer no survival benefit in a randomized trial clarifying the role of splenectomy (JCOG0110 study). Although many studies have explored risk factors for morbidities following total gastrectomy, none have assessed the risk factors for postoperative complications in spleen-preserving total gastrectomy.

Methods: Using data from 505 patients enrolled in a previous randomized trial, risk factors for postoperative complications were identified by multivariable logistic regression analysis.

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Introduction: Osteoarthritis (OA) is the most common form of arthritis. OA results from the breakdown of cartilage, which leads to deterioration of the entire joint and the connective tissue that holds the joint together, and gradually and irreversibly worsens over time. Adipose-derived stem/stromal cells (ADSCs) have been used in the treatment of knee OA.

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Article Synopsis
  • - This study assessed the effectiveness and safety of combining radiation therapy with atezolizumab for bladder cancer treatment in patients who couldn't undergo surgery.
  • - Out of 45 patients treated, 84.4% achieved a pathologic complete response (pCR), especially in older adults and those with high PD-L1 tumor expression.
  • - While 93.3% experienced side effects, mostly mild to moderate ones like diarrhea, the overall results suggest that this combination therapy may be a viable option for preserving the bladder.
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Autologous protein solution (APS) is made from platelet-rich plasma that extracts high-concentration growth factors and cytokines. Intra-articular APS injection was reported to improve knee osteoarthritis (KOA) pain and function. However, efficacy differences regarding osteoarthritis severity remained unknown.

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Background: The goal of the study was to evaluate the diagnostic ability of F-FBPA PET/CT for malignant tumors. Findings from F-FBPA and F-FDG PET/CT were compared with pathological diagnoses in patients with malignant tumors or benign lesions.

Methods: A total of 82 patients (45 males, 37 females; median age, 63 years; age range, 20-89 years) with various types of malignant tumors or benign lesions, such as inflammation and granulomas, were examined by F-FDG and F-FBPA PET/CT.

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Article Synopsis
  • After regular radiation therapy, some surgeries can have lots of problems, but BNCT (Boron Neutron Capture Therapy) might help.*
  • In a patient with cancer in the head and neck, BNCT worked well to shrink a tumor that was stuck to a big blood vessel.*
  • The study suggests that BNCT could make it easier and safer to do surgery later on without hurting nearby healthy tissue too much.*
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