Publications by authors named "Saito Ryoichi"

Antimicrobial resistance is a major global concern and economic threat, necessitating a reliable monitoring approach to understand its frequency and spread via the environment. Hospital wastewater serves as a critical reservoir for antimicrobial-resistant organisms; however, its role in resistance gene distribution and dissemination remains poorly understood. This study integrates metagenomic and metatranscriptomic analyses, elucidating the dynamics of antimicrobial resistance in hospital wastewater.

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Purpose: Circulating tumor DNA (ctDNA) analysis is an alternative to tissue biopsy for genotyping in various cancers. We aimed to establish a plasma ctDNA sequencing assay, then evaluate its clinical utility in advanced urothelial cancer (UC).

Materials And Methods: This study included 82 patients with muscle-invasive or metastatic UC.

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Purpose: To evaluate functional and oncological outcomes in patients who underwent unilateral or bilateral nerve-sparing (NS) robot-assisted radical prostatectomy (RARP) for high-risk prostate cancer.

Methods: The cohort comprised 2683 patients with clinical stage T1-4, N0M0 high-risk prostate cancer who underwent RARP in Japanese tertiary care centers from August 2011 to April 2023. High risk was defined using the European Association of Urology risk stratification criteria.

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  • The study examined postoperative complication rates in elderly prostate cancer patients undergoing robot-assisted radical prostatectomy (RARP) across various age groups.
  • A total of 8,055 patients were analyzed, revealing similar complication rates for those under 70 and those aged 75 or older.
  • The conclusion indicated that age alone does not significantly increase the risk of complications after RARP in well-selected elderly patients, suggesting that surgery can be safely performed on older populations.
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Interferometers, which are built using spatially propagating light or matter waves, are commonly used to measure physical quantities. These measurements are made possible by exploiting the interference between waves traveling along different paths. This study introduces a novel approach to sensing of the Aharonov-Bohm phase, an ion matter-wave interferometer operating within a two-dimensional rotational trajectory in a trap potential.

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  • This study looked at women with bladder cancer who had surgery to remove their bladder and other reproductive organs to see how many still had problems with their reproductive organs.
  • Out of 417 women, some had their uterus and vaginal wall saved, but about 9% showed signs of cancer in their reproductive areas.
  • The researchers concluded that doctors need to think carefully about whether to save these organs during surgery because there's a risk that cancer could still affect them.
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  • - This study aimed to create a prognostic model to estimate the risk of cancer-specific mortality in bladder cancer patients after radical cystectomy (RC), using data from 36 institutions in Japan.
  • - Researchers analyzed patient data without adjuvant chemotherapy, splitting it into training and validation sets, and used a multivariable Cox regression model to predict outcomes based on 25 variables.
  • - The final model, which included eight key variables, outperformed the existing CheckMate 274 classification, correctly reclassifying a significant portion of high-risk patients into a better prognosis group, enhancing potential treatment decisions.
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Extranodal extension in metastatic lymph nodes (LNs) is a poor prognostic factor in bladder cancer (BC). Furthermore, cancer invasion levels in sentinel LNs are associated with prognosis in melanoma. The present study aimed to evaluate the LN invasion level, defined as the extent of cancer invasion in anatomical and immunological LN substructures, and compare it with the pathological node (pN) stage of the tumor-node-metastasis staging system in BC.

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  • Clostridioides difficile infection, linked to antibiotic use, can also arise without such exposure, leading to severe diarrhea and even intussusception, a rare intestinal obstruction.
  • An 82-year-old man in Japan experienced severe symptoms including dizziness, diarrhea, and respiratory distress, ultimately diagnosed with community-acquired C. difficile infection and subsequent intussusception.
  • Treatment with vancomycin was initiated, but surgery was required to resolve the intussusception, revealing a highly virulent strain of C. difficile linked to severe gastrointestinal complications.
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Purpose: Colistin is classified by the World Health Organization (WHO) as a critically important and last-resort antibiotic for the treatment of infections caused by carbapenem-resistant bacteria. However, colistin resistance mediated by chromosomal mutations or plasmid-linked mobilized colistin resistance () genes has emerged.

Methods: Thirteen -positive species isolated from water samples collected in Eastern Ghana were analyzed using whole-genome sequencing (WGS).

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  • * A total of 383 patients were analyzed, revealing that those with persistent PSA levels post-surgery had significantly shorter castration resistance-free survival (CRFS) and metastasis-free survival (MFS) compared to those with non-persistent levels.
  • * The findings suggest that stratifying patients by PSA levels can help tailor postoperative treatment, with patients experiencing better outcomes when receiving a combination of androgen deprivation therapy and radiotherapy if their PSA levels are high.
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  • The study examines the effectiveness of salvage radiotherapy in patients with biochemical recurrence after prostatectomy, focusing on factors that influence patient outcomes.
  • It evaluated 67 patients from 2005 to 2019, finding a 5-year biochemical recurrence-free survival (bRFS) rate of 47.1%, with key factors like PSA doubling time and surgical margins impacting survival rates.
  • The research concludes that a PSA doubling time of less than 6 months and positive surgical margins predict worse outcomes for salvage radiotherapy, while no serious side effects were reported.
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Objectives: To determine the effects of prophylactic urethrectomy (PU) on oncological and perioperative outcomes in patients with bladder cancer (BC) undergoing radical cystectomy (RC).

Methods: This retrospective study analyzed data on 1976 evaluable patients with BC who underwent RC. Patients were drawn from 36 institutions within the Japanese Urological Oncology Group.

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Background: Non-toxic approaches to enhance radiotherapy outcomes are beneficial, particularly in ageing populations. Based on preclinical findings showing that high-fibre diets sensitised bladder tumours to irradiation by modifying the gut microbiota, along with clinical evidence of prebiotics enhancing anti-cancer immunity, we hypothesised that dietary fibre and its gut microbiota modification can radiosensitise tumours via secretion of metabolites and/or immunomodulation. We investigated the efficacy of high-fibre diets combined with irradiation in immunoproficient C57BL/6 mice bearing bladder cancer flank allografts.

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Utility of a recently developed long-read pipeline, Emu, was assessed using an expectation-maximization algorithm for accurate read classification. We compared it to conventional short- and long-read pipelines, using well-characterized mock bacterial samples. Our findings highlight the necessity of appropriate data-processing for taxonomic descriptions, expanding our understanding of the precise microbiome.

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Objectives: The American Joint Committee on Cancer (AJCC)/Union for International Cancer Control (UICC) 8th edition has proposed micrometastasis as a lymph node metastasis (LN+) of diameter ≤2 mm in prostate cancer. However, supporting evidence has not described. We evaluated LN+ patients' survival after radical prostatectomy (RP) based on the LN maximum tumor diameter (MTD).

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  • - The study investigates the effects of enfortumab vedotin, a new treatment for urothelial cancer, focusing on how peripheral neuropathy impacts its effectiveness and if early nerve changes are linked to neuropathy onset.
  • - In a trial involving 34 patients with advanced bladder cancer who had not responded to previous therapies, the treatment showed promising results with a 52.9% overall response rate and significant survival benefits.
  • - Peripheral neuropathy was present in 12.5% of patients, but interestingly, those affected had better response rates compared to those without neuropathy; nerve studies showed that sensory nerves were more impacted, particularly the sural nerve.
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In cases of rectal invasion by locally invasive prostate cancer (LAPC) leading to severe pain or bleeding, total pelvic exenteration (TPE) is necessary. Here, we present two cases of successful minimally invasive TPE: one performed laparoscopically for local recurrence with rectal bleeding after laparoscopic radical prostatectomy, and another done robotically for LAPC (clinical T4N1M0) accompanied by rectal bleeding. Medical treatments were ineffective in the latter case, and the tumor occupied a significant portion of the pelvis.

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  • This study created a prognostic model to predict disease recurrence in patients with lymph node involvement but no ongoing PSA levels.
  • Researchers analyzed data from 231 patients who underwent surgery between 2006 and 2019, identifying key factors affecting recurrence-free survival (RFS).
  • The model, which includes parameters like initial PSA level and surgical margin status, is said to aid in treatment discussions with patients.
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Objective: To analyse the impact of histological discordance of subtypes (subtypes or divergent differentiation [DD]) in specimens from transurethral resection (TUR) and radical cystectomy (RC) on the outcome of the patients with bladder cancer receiving RC.

Patients And Methods: We analysed data for 2570 patients from a Japanese nationwide cohort with bladder cancer treated with RC between January 2013 and December 2019 at 36 institutions. The non-urinary tract recurrence-free survival (NUTR-FS) and overall survival (OS) stratified by TUR or RC specimen histology were determined.

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Background: This study aimed to investigate factors, including the degree of hydronephrosis, that may be associated with decreased renal function after radical nephroureterectomy (RNU).

Methods: This study included 252 patients who underwent laparoscopic RNU with an estimated glomerular filtration rate (eGFR) ≥ 30 ml/min/1.73 m in three institutions.

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Congenital hypogonadotropic hypogonadism (CHH) is a genetically and clinically diverse disorder encompassing Kallmann syndrome (KS) and normosmic CHH (nCHH). Although mutations in numerous genes account for nearly 50% of CHH cases, a significant portion remains genetically uncharacterized. While most mutations follow the traditional Mendelian inheritance patterns, evidence suggests oligogenic interactions between CHH genes, acting as modifier genes to explain variable expressivity and incomplete penetrance associated with certain mutations.

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Coronavirus disease (COVID-19) has caused extensive mortality globally; therefore, biomarkers predicting the severity and prognosis of COVID-19 are essential. This study aimed to evaluate the application of presepsin (P-SEP) and thrombomodulin (TM), which are biomarkers of sepsis and endothelial dysfunction, respectively, in the prognosis of COVID-19. Serum P-SEP and TM levels from COVID-19 patients (n = 183) were measured.

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  • Gas gangrene and food poisoning are linked to a specific bacterium, making its monitoring crucial for public health.
  • Whole-genome sequencing helps analyze the bacterium’s virulence and genetic diversity, yet data gaps from environmental sources in developing countries limit our understanding.
  • New genetic data from strains in Ghana’s hospital effluent indicate that pathogenic bacteria may spread in clinical environments, highlighting the need for risk assessment to prevent food poisoning outbreaks.
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  • Researchers found that monoclonal antibodies (mAbs) with a high isoelectric point (pI) clear quickly from plasma and have a large distribution volume in mice, but existing pharmacokinetic models don't explain this behavior.
  • To improve understanding, they optimized various physiological parameters and developed a new pharmacokinetic model that demonstrated a positive relationship between pI, plasma clearance (CL), and distribution volume (Vdss) in wild-type and FcRn-deficient mice.
  • Their findings suggest that a positive electrostatic interaction between mAbs and endothelial membranes enhances the transcytosis (transport) of mAbs, leading to better distribution in the body and which counters previous models' assumptions.
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