Publications by authors named "Michihiro Iwaki"

Article Synopsis
  • The study assessed the effectiveness of serum type 4 collagen 7S (COL4-7S) compared to the Enhanced Liver Fibrosis (ELF) score in detecting liver fibrosis in patients with metabolic dysfunction-associated steatotic liver disease (MASLD).
  • Among 1,368 patients, 794 were analyzed, revealing that both COL4-7S and ELF scores rise with increasing fibrosis, but COL4-7S showed significantly better performance for identifying advanced fibrosis (≥2) especially in diabetic patients.
  • Overall, COL4-7S proved to be at least as effective as the ELF score in diagnosing advanced liver disease in MASLD patients.
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Objectives: New scores were developed to identify at-risk metabolic dysfunction-associated steatohepatitis (MASH) using multiparametric MRI (mpMRI).

Materials And Methods: A prospective study was conducted on 176 patients with suspected or diagnosed metabolic dysfunction-associated steatotic liver disease (MASLD) paired with an MR scan, vibration-controlled transient elastography (VCTE), and liver biopsy. Liver stiffness measurement (LSM) using magnetic resonance elastography (MRE), proton density fat fraction (PDFF), and mpMRI-based corrected T1 (cT1) were combined to develop a one-step strategy, named MPcT (MRE + PDFF + cT1, combined score), and a two-step strategy-MRE-based LSM followed by PDFF with cT1 (M-PcT, paired score) for diagnosing at-risk MASH.

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Introduction: Non-alcoholic fatty liver disease, now known as metabolic dysfunction-associated steatotic liver disease (MASLD), is a phenotype of the metabolic syndrome in the liver and is clearly associated with metabolic abnormalities such as hyperglycaemia and dyslipidaemia. Although the prevalence of MASLD is increasing worldwide, there is currently no consensus on the efficacy and safety of the drugs used to treat MASLD/metabolic dysfunction-associated steatohepatitis (MASH). Pemafibrate, a selective peroxisome proliferator-activated receptor alpha modulator, was designed to have higher peroxisome proliferator-activated receptor alfa (PPARα) agonist activity and selectivity than existing PPARα agonists, and in development trials, without increasing creatinine levels, lipid parameters and alanine aminotransferase (ALT) were significantly improved.

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Background And Aims: Although numerous noninvasive diagnostic methods have been developed to predict liver fibrosis in metabolic dysfunction-associated steatotic liver disease (MASLD), they lack markers for predicting lobular inflammation, hepatocellular ballooning, or changes related to metabolic dysfunction-associated steatohepatitis (MASH). We examined serum cytokeratin 18 fragment (CK18F) as a noninvasive marker for predicting treatment response and "at-risk MASH" and "MASH resolution" in patients with MASLD.

Methods: One-hundred-and-ten patients with MASLD who underwent repeated biopsy were enrolled (age, 4 [0.

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Article Synopsis
  • The study aimed to improve the prediction of liver-related events (LRE) in patients with metabolic dysfunction-associated steatotic liver disease (MASLD) by combining the Fibrosis-4 (FIB-4) index with genetic polymorphism data.
  • Researchers enrolled 1,304 Japanese patients, identifying key genotypes associated with LRE while tracking outcomes over an 8.1-year follow-up period, during which 96 LREs occurred.
  • The findings suggested that a two-step screening strategy using the FIB-4 index followed by genetic assessment effectively identifies high-risk patients, with notable differences in survival rates and LRE development across risk groups.
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  • - This study assessed how effective and safe linaclotide is for treating chronic constipation (CC) and irritable bowel syndrome with constipation (IBS-C) in patients who didn't respond to magnesium oxide.
  • - Conducted over 12 weeks, 61 participants showed significant improvements in quality of life and bowel movement frequency, with noticeable changes in various symptoms measured on standard scales.
  • - The findings suggest that linaclotide could be a viable treatment for elderly patients with CC who haven't had success with traditional treatments, although some experienced diarrhea which was manageable.
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  • The study explores the prevalence of steatotic liver disease (SLD) using the new multisociety consensus nomenclature, identifying its different subtypes such as MASLD and MetALD among 6,530 health check-up participants in Japan.
  • Results indicate a 39.5% overall prevalence of SLD, with most cases classified as MASLD, and a small portion showing significant fibrosis as determined by liver stiffness measurement.
  • Although the FIB-4 index is convenient for assessing liver fibrosis, its diagnostic performance as a primary screening tool is limited, particularly in the general population, suggesting the need for more effective screening methods.
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Purpose: Opioid-induced constipation is the most frequent and non-self-limiting adverse effect of opioid analgesia, reducing adherence and interfering with pain relief. This clinical trial aimed to clarify the preventive effect of naldemedine versus placebo for constipation in patients with cancer starting regularly dosed strong opioids therapy.

Methods: This multicenter, double-blinded, randomized, placebo-controlled, confirmatory trial was conducted between July 2021 and May 2023 at four academic hospitals in Japan (Japan Registry of Clinical Trials identifier: jRCTs031200397).

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  • Nonalcoholic fatty liver diseases (NAFLD) and nonalcoholic steatohepatitis (NASH) can lead to hepatocellular carcinoma (HCC), prompting a study of risk stratification methods using histological features and noninvasive markers in patients with liver biopsy-confirmed NAFLD or NASH.
  • The study included 1389 patients and compared the predictive ability of histological factors and noninvasive models such as the aMAP score, FIB-4 index, and ALBI score, revealing that the aMAP score had the highest predictive power for HCC.
  • The aMAP score and FIB-4 index were found to be superior to histological features for
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Although handheld ultrasound devices (HUDs) are commonplace, their ability to diagnose fecal retention (FR) remains unclear. This prospective observational study examined HUDs' usefulness in diagnosing FR in patients with constipation in a palliative care setting. Between 10 December 2020 and 30 June 2022, we compared rectal ultrasonographic findings obtained using HUDs with clinical manifestations in 64 males and 70 females (48%, 52%, 68 ± 11 years old) with constipation who had undergone computed tomography (CT).

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Background: Refractory ascites affects the prognosis and quality of life in patients with liver cirrhosis. Peritoneovenous shunt (PVS) is a treatment procedure of palliative interventional radiology for refractory ascites. Although it is reportedly associated with serious complications (e.

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Article Synopsis
  • Researchers found that the Fibrosis-3 (FIB-3) index can accurately predict liver fibrosis progression in patients with metabolic dysfunction-associated steatotic liver disease (MASLD), regardless of age.
  • In a study of 1,398 patients, the FIB-3 index performed as well as the Fibrosis-4 (FIB-4) index for those under 60, but outperformed it for patients aged 60 and older.
  • The FIB-3 index’s effectiveness suggests it could be a more reliable tool for assessing liver fibrosis than existing methods, enhancing diagnosis across different age groups.
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Aims: A multi-stakeholder consensus has proposed MASLD (metabolic dysfunction-associated steatotic liver disease). We aimed to investigate the pathological findings related to the mid-term mortality of patients with biopsy-proven MASLD in Japan.

Methods: We enrolled 1349 patients with biopsy-proven MASLD.

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Background & Aims: PNPLA3 rs738409, TM6SF2 rs58542926, and HSD17B13 rs72613567 have been associated with an increased risk of liver-related events (LREs) in patients with metabolic dysfunction-associated steatotic liver disease (MASLD). In this study, we investigated the combined effects of these variants on LREs.

Methods: The longitudinal multicenter cohort study enrolled 1178 patients with biopsy-proven MASLD.

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Introduction: Approved drug therapies for nonalcoholic steatohepatitis (NASH) are lacking, for which various agents are currently being tested in clinical trials. Effective drugs for liver fibrosis, the factor most associated with prognosis in NASH, are important.

Areas Covered: This study reviewed the treatment of NASH with a focus on the effects of existing drugs and new drugs on liver fibrosis.

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Article Synopsis
  • The study redefines nonalcoholic fatty liver disease (NAFLD) as metabolic dysfunction-associated steatotic liver disease (MASLD), analyzing its prognosis through a multicenter study involving 1,398 patients.
  • Approximately 99% of the patients were diagnosed with MASLD, showing that those without cardiometabolic risk factors had a significantly lower body mass index (BMI) and less severe liver histology.
  • The prognosis for patients with MASLD remained similar to previous findings for NAFLD, with most deaths attributed to extrahepatic cancers and liver-related complications being less common among those without metabolic risks.
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Background And Aims: The diagnostic performance of the Fibrosis-4 (FIB-4) index and nonalcoholic fatty liver disease (NAFLD) fibrosis score (NFS) is poor in patients with type 2 diabetes mellitus (T2DM). We determined the usefulness of the Enhanced Liver Fibrosis (ELF) test in patients with T2DM.

Methods: A total of 1228 patients with biopsy-proven NAFLD were enrolled.

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Metabolic dysfunction-associated steatotic liver disease (MASLD), formerly known as nonalcoholic fatty liver disease (NAFLD), is the most common liver disease. It has a rapidly growing patient population owing to the increasing prevalence of obesity and type 2 diabetes. Patients with MASLD are primarily treated by family physicians when fibrosis is absent or mild and by gastroenterologists/hepatologists when fibrosis is more advanced.

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Background: Cholesterol levels and bile acid metabolism are important drivers of metabolic dysfunction-associated steatohepatitis (MASH) progression. Using a mouse model, we investigated the mechanism by which cholesterol exacerbates MASH and the effect of colestyramine (a bile acid adsorption resin) and elobixibat (an apical sodium-dependent bile acid transporter inhibitor) concomitant administration on bile acid adsorption and MASH status.

Methods: Mice were fed a high-fat high-fructose diet with varying concentrations of cholesterol to determine changes in fatty liver according to liver status, water intake, defecation status, insulin resistance, bile acid levels, intestinal permeability, atherosclerosis (in apolipoprotein E knockout mice), and carcinogenesis (in diethylnitrosamine mice).

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Background: The prognosis of metabolic dysfunction-associated steatotic liver disease (MASLD) is strongly associated with liver fibrosis. We aimed to investigate whether liver stiffness measurement (LSM) and changes in LSM (ΔLSM) on magnetic resonance elastography (MRE) can predict clinical events in patients with MASLD.

Methods: We included 405 patients with MASLD who underwent at least two MREs.

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Background And Aims: Both fibrosis status and body weight are important for assessing prognosis in nonalcoholic fatty liver disease (NAFLD). The aim of this study was to identify population clusters for specific clinical outcomes based on fibrosis-4 (FIB-4) index and body mass index (BMI) using an unsupervised machine learning method.

Methods: We conducted a multicenter study of 1335 biopsy-proven NAFLD patients from Japan.

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Article Synopsis
  • Drug-induced liver injury (DILI) is a leading cause of acute liver issues and transplants, with recent increases linked to the use of immune checkpoint inhibitors.
  • DILI is categorized into intrinsic, which is dose-dependent and predictable, and idiosyncratic, which is dose-independent and unpredictable, with chronic cases potentially showing autoimmune hepatitis.
  • Treatment focuses on stopping the harmful drug and administering steroids; in cases resistant to steroids, other medications like mycophenolate mofetil may be used.
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Nonalcoholic fatty liver disease (NAFLD) is currently the most common chronic liver disease, and there has been a rapid increase in cases worldwide. NAFLD is rapidly becoming the leading cause of hepatocellular carcinoma and is also associated with an increased risk of cardiovascular disease or exacerbation of other organ diseases, thus posing a significant health problem from both a medical and a socioeconomic perspective. NAFLD is a systemic disease and requires the involvement of numerous medical professionals.

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