Publications by authors named "Masaki Nakamura"

Background: Secreted protein, acidic and rich in cysteine (SPARC) may play an important role in tumor microenvironment (TME) contribution to metastasis, however molecular mechanism of SPARC contribution to TME remains elusive.

Experimental Design: In this study, SPARC molecular status was explored for its clinical and functional relevance to metastasis in the context of its stromal overexpression, which may represent colorectal cancer (CRC) progression.

Results: SPARC expression was highly specific to cancer stroma of CRC tumors (GSE35608) and exhibited prognostic relevance.

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Background: The standard treatment for unresectable non-small cell lung cancer (NSCLC) is anti-PD-L1 therapy combined with chemoradiotherapy (anti-PD-L1-CRT). Although some patients achieve complete cancer eradication and cure, more than half of patients retain persistent cancer cells. Our research aimed to unravel the nuanced mechanisms involved in both immune attack and evasion induced by anti-PD-L1-CRT with single cell spatial transcriptome.

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Objectives: Enhanced recovery after surgery is a comprehensive, multidisciplinary perioperative care program designed to minimize postoperative complications. Despite its widespread use in urological surgeries, the effect of enhanced recovery after surgery on the quality of life during robot-assisted radical prostatectomy remains unclear. We performed a prospective cohort study to elucidate the effect of enhanced recovery following robot-assisted radical prostatectomy on patients' quality of life.

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Although hippocampal-sparing whole-brain irradiation (HS-WBI) offers potential neurocognitive benefits, it poses challenges in treatment planning. This study aimed to compare the dose distributions of biaxially rotational dynamic radiation therapy (BROAD-RT) with a novel O-ring-type linear accelerator (OXRAY) and conventional non-coplanar volumetric modulated arc therapy (VMAT) planning (Conv-VMAT) in HS-WBI treatment plans. This study included 10 patients with brain metastases from lung cancer at our institution.

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Purpose: Sarcopenia is characterized by loss of skeletal muscle mass, strength, and physical ability and is a well-established predictor of postoperative complications. However, the optimal method for preoperative assessment remains controversial. This study evaluated preoperative skeletal muscle density using computed tomography as a surrogate marker for sarcopenia to predict postoperative complications in patients undergoing highly invasive surgery for upper abdominal cancer.

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Methicillin-resistant Staphylococcus aureus (MRSA) is highly drug-resistant. The current Japanese guidelines (2019 edition) for managing and treating MRSA infections mention alternative anti-MRSA agents, including sulfamethoxazole-trimethoprim (ST) and rifampicin (RFP). Both ST and RFP are oral drugs and are expected to be effective alternatives to anti-MRSA drugs in clinical cases where anti-MRSA drugs are not indicated.

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Purpose: To identify biomarkers for diagnosis and classification of interstitial cystitis/bladder pain syndrome (IC/BPS) by urinary lipidomics coupled with machine learning.

Methods: Urine samples from 138 patients with IC/BPS, including 116 with Hunner lesion (HL) and 22 with no HL, and 71 controls were assessed by lipid chromatography-tandem mass spectrometry. Single and paired lipid analyses of differentially expressed lipids in each group were conducted to assess their diagnostic ability.

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Introduction: While multi-locus variable number tandem repeat analysis (MLVA) as molecular epidemiological analysis has been used to detect Mycobacterium tuberculosis outbreaks, its discriminatory power for identifying strains is limited. Whole-genome sequencing (WGS) offers high discriminatory power but is expensive. This study was established to develop a strategy to overcome these limitations of molecular epidemiological analysis by combining it with population genetic analysis.

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Preservation of renal function is an important goal of partial nephrectomy (PN) for renal tumors. Several attempts to preserve postoperative renal function, including hilar control surgery and omission of renal cortical renorrhaphy, have been reported, but the influence of each procedure remains controversial. We conducted a literature review based on PubMed to summarize the current situation and clarify the influence of each procedure on postoperative renal function.

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Purpose: Radiotherapy is the standard treatment for unresectable stage I-IIA non-small cell lung cancer (NSCLC). One treatment option within radiotherapy is proton beam therapy (PBT). Currently, a prospective observational study is being conducted at all proton therapy centers in Japan as part of a proton beam all-case registry.

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Background/aim: Stereotactic body radiation therapy (SBRT) for centrally located hepatocellular carcinomas (HCCs) can cause severe central biliary toxicity. However, dose de-escalation SBRT has the potential to reduce biliary toxicity with excellent tumor control. Therefore, we aimed to retrospectively evaluate the efficacy and toxicity of de-escalated SBRT in patients with hepatic hilum HCC.

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Platinum-based definitive chemoradiotherapy (dCRT) is the standard treatment for patients with unresectable locally advanced esophageal squamous cell carcinoma (ESCC) that invades the aorta, vertebral body or trachea; however, complete response rates remain low (11-25%), leading to poor survival. To evaluate the additive efficacy of the anti-PD-L1 antibody drug atezolizumab, we conducted a phase 2, multicenter, single-arm trial of 1 year of atezolizumab treatment following dCRT in 40 patients with unresectable locally advanced ESCC recruited from seven Japanese centers (UMIN000034373). The confirmed complete response (cCR) rate (primary end point) of the first consecutive 38 patients was 42.

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Partial nephrectomy has become the gold standard treatment for small renal masses. This study aimed to assess the impact of soft coagulation hemostasis on parenchymal volume reduction of the operated kidney after an open partial nephrectomy. We retrospectively reviewed 94 patients with small renal tumors who underwent open partial nephrectomy with soft-coagulation hemostasis at our institution.

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Aims: This study aimed at developing a scoring system (EAST score) to predict recurrence after chemoradiotherapy in limited-stage small-cell lung cancer (LS-SCLC).

Patients & Methods: Treatment-naïve LS-SCLC patients receiving concurrent chemoradiotherapy (CCRT) ( = 234) or sequential chemoradiotherapy ( = 53) were retrospectively reviewed. Using data from CCRT population, clinical and radiological variables associated with disease progression were identified.

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Bone-modifying agents (BMAs) have been widely used to reduce skeletal-related events, including pathological fractures. Herein, we aimed to clarify the incidence of pathological fractures caused by high-risk femoral bone metastases after palliative radiotherapy (RT) in the BMA era and evaluate the necessity of prophylactic surgical stabilization. We assessed 90 patients with high-risk femoral bone metastases, indicated by Mirels' scores ≥ 8, without pathological fractures and surgical fixations, who received palliative RT at our institution between January 2009 and December 2018.

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Radiotherapy (RT) combined with immune checkpoint inhibitor (ICI) therapy has attracted substantial attention due to its potential to improve outcomes for patients with several types of cancer. However, the optimal administration timepoints and drug combinations remain unclear because the mechanisms underlying RT-induced changes in immune checkpoint molecule expression and interaction with their ligand(s) remain unclear. In this study, we demonstrated the dynamics of lymphocyte-mediated molecular interactions in tissue samples from patients with esophageal cancer throughout RT schedules.

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Hunner-type interstitial cystitis (HIC) is a chronic inflammatory disease of the urinary bladder with an unknown etiology. We conducted comprehensive immunogenomic profiling of bladder specimens obtained by biopsy and cystectomy from 37 patients with HIC. Next-generation RNA sequencing demonstrated abundant plasma cell infiltration with frequent light chain restriction in HIC-affected bladder tissue.

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Article Synopsis
  • * The spread of colistin-resistance genes, which are carried by plasmids, is a growing global issue.
  • * Researchers found specific bacterial species with these resistance genes in a wastewater treatment facility in Japan.*
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Introduction: Pelvic arteriovenous malformations are rare in male patients. We present a case of pelvic arteriovenous malformation involving the seminal vesicle.

Case Presentation: A 58-year-old man was diagnosed with pelvic arteriovenous malformation that involved the left seminal vesicle by angiography.

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  • The study investigates prescription trends for benign prostatic hyperplasia (BPH) medications in Japan from 2014 to 2021, focusing on high-rated drugs in clinical guidelines.
  • It found that prescriptions for α1-blockers and 5α-reductase inhibitors increased significantly during this period, while tadalafil prescriptions also rose sharply.
  • Despite the increase in prescriptions, the overall market for BPH drugs declined due to a shift towards generics and changes in healthcare policies, highlighting the need for ongoing assessment of treatment effectiveness and costs.
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  • The study aimed to assess the feasibility of using RT-PCR and direct sequencing to measure HPV DNA levels in the saliva of patients with HPV-related oropharyngeal cancer, which is important for predicting treatment outcomes.
  • Nine patients undergoing treatment were monitored by collecting saliva samples at various stages of their radiotherapy, and HPV DNA levels were analyzed.
  • Results showed a decrease in HPV DNA levels during and after treatment for most patients, with some experiencing disease progression, and sequencing revealed significant gene mutations in their baseline samples.
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  • - This study investigated the acute toxicity of hypo-fractionated radiotherapy in Japanese breast cancer patients post-surgery, focusing on two treatment cohorts: moderately hypo-fractionated (Cohort M) and ultra-hypo-fractionated (Cohort U).
  • - A total of 123 patients were evaluated over 90 days after treatment, with the most common acute adverse events being grade 1 and 2, and no grade 3 or higher events reported.
  • - The study concluded that the rates of acute toxicity from these radiotherapy methods were considered acceptable, with 15% for Cohort M and 10% for Cohort U experiencing grade 2 or higher adverse events.
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Introduction: Cardiac remodeling is defined as cellular interstitial changes that lead dysfunction of the heart after injury. Placental growth factor (PlGF), a member of the VEGF family, has been reported to regulate cardiac hypertrophy in hemodynamic state. We therefore analyze the function of PlGF during cardiac remodeling using cardiac cells and fibroblasts, under Angiotensin II (AngII) stimulation.

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