Publications by authors named "Akira Tsujimura"

Extending healthy lifespans is an important public health goal in societies with a long life expectancy. Late-onset hypogonadism (LOH), a condition associated with an age-related decrease in testosterone level, contributes to the onset of various diseases. Previously, we demonstrated that the oral ingestion of bean sprouts rich in the HASPIN inhibitor coumestrol increased blood testosterone levels in mice.

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Purpose: Premature ejaculation (PE) is a most common sexual complaint among men worldwide, but its prevalence and associated factors in Japan remain underexplored. This study aimed to determine the prevalence of self-reported PE, lifelong PE (LPE), and acquired PE (APE) among Japanese men, as well as to identify associated factors, distress levels, and healthcare-seeking behaviors through a nationwide cross-sectional survey.

Materials And Methods: This internet-based nationwide cross-sectional survey was conducted among Japanese men from 20 to 79 years old by the Clinical Research Promotion Committee of the Japanese Society for Sexual Medicine (JSSM).

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Purpose: Non-obstructive azoospermia (NOA), defined as the absence of sperm in the ejaculate due to testicular failure, is observed in 5% to 15% of infertile men and accounts for two-thirds of azoospermia cases. The management of NOA is marked by significant controversy and global variation in diagnostic and therapeutic approaches, highlighting the crucial need for well-designed and standardized clinical practice guidelines. We present comprehensive graded clinical practice recommendations and statements for diagnosing and treating NOA, aiming to establish standardized strategies that can globally help guide practitioners in their practice.

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To evaluate the current perspectives on reporting success rates for assisted reproductive technology, the authors conducted a nationwide survey. Of the 327 facilities that responded (response rate: 53.5%), over half recognized potential benefits of reporting in vitro fertilization (IVF) success rates, such as aiding patients in selecting a clinic (68.

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Objective: We evaluated the efficacy and safety of a new low-intensity extracorporeal shockwave therapy generator, the Morenova system (Direx Systems GmbH, Wiesbaden, Germany), that offers fewer treatments and shorter treatment times through dual-probe energy delivery for patients with erectile dysfunction (ED). We additionally examined whether aging affects treatment efficacy and whether there are independent factors that predict treatment efficacy. To evaluate efficacy from the viewpoint of patient satisfaction, free comments written by the patients were analyzed by artificial intelligence (AI) to clarify the percentage of responses judged to be "positive.

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These 2024 guidelines address male infertility amid Japan's declining birth rate, following the recent provision of national health insurance coverage for infertility treatments. Male factors contribute to approximately 50% of infertility cases, with spermatogenic dysfunction being the most common cause (82.4%).

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Objective: To clarify the efficacy and safety of testosterone replacement treatment for eugonadal patients with symptoms of late-onset hypogonadism.

Materials And Methods: 565 eugonadal men with symptoms of late-onset hypogonadism who underwent testosterone replacement treatment were included in this study. Physical factors, laboratory and endocrinologic variables, and scores of several questionnaires were evaluated.

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In recent years, molecular target drugs have become integral in treating malignant tumours. Multikinase inhibitors (MKIs) have been associated with serious skin disorders, including hand-foot skin reaction (HFSR), which impair patient quality of life, often disrupting activities of daily living necessitating dose reduction or discontinuation. As the pathogenic mechanisms of these skin disorders are unknown, no effective treatments have been established.

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Purpose: To evaluate the evidence on sperm DNA fragmentation (SDF) and its clinical applications in reproductive medicine, highlighting benefits, limitations, and guidelines for its use to assist clinicians in objective decision-making.

Materials And Methods: A multidisciplinary team of clinicians and reproductive experts from the Global Andrology Forum (GAF) reviewed the latest evidence on SDF, covering indications, testing methods, recurrent pregnancy loss, varicocele and its repair, assisted reproductive technologies (ART), treatment of associated conditions, antioxidant therapy, and sperm selection for ART. Expert statements and recommendations were developed and graded with the GRADE system using a modified Delphi process.

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Gut microbiota plays a crucial role in the development and progression of prostate cancer, with previous studies indicating that certain bacterial taxa are more abundant in castration-resistant prostate cancer (CRPC) compared to hormone-sensitive prostate cancer (HSPC). Notably, the composition of gut microbiota can vary significantly by geographic region, and Japanese individuals have a distinct microbial profile. However, research exploring these differences within Japanese populations remains limited.

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Purpose: Twenty five years have passed since the first national survey on erectile dysfunction (ED) in Japan. The Japanese Society for Sexual Medicine conducted a nationwide survey on the actual status of sexual function targeting men over 20 years old in Japan using validated questionnaires commonly used in clinical practice.

Materials And Methods: Japanese men aged 20 to 79 years participated in our online epidemiological study on sexual dysfunction.

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Article Synopsis
  • - The study investigates the effects of bean sprout ingestion, which contains the HASPIN inhibitor coumestrol, on cancer-related health issues in mice, specifically focusing on familial adenomatous polyposis (FAP).
  • - Mice were divided into two groups: a control group with a standard diet and a treatment group with 15% bean sprouts added to their diet, starting at 7 weeks old and analyzed at 12 weeks.
  • - Results showed that bean sprout consumption reduced intestinal polyp development, cachexia, and hypogonadism while increasing serum testosterone levels in male mice, suggesting potential cancer prevention benefits for humans.
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Objectives: The vacuum erection device (VED) is a second-line treatment tool recommended in erectile dysfunction (ED) guidelines but has long been unavailable in Japan. A new VED, Vigor 2020 (A & HB Company Limited, Tokyo, Japan), has now been manufactured and received medical approval from the Pharmaceuticals and Medical Devices Agency in Japan. We conducted a retrospective observational study of ED patients who used Vigor 2020 in clinical practice.

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A 40-year-old man with a four-year history of infertility was referred to our department. The semen analysis revealed low motility, and the blood test showed low luteinizing hormone levels. Gonadotropin therapy was initiated upon the diagnosis of hypogonadotropic hypogonadism.

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Article Synopsis
  • Non-obstructive azoospermia (NOA) is a prevalent and complex issue with varied treatment options and no definitive guidelines, leading to differing management practices internationally.
  • A comprehensive survey with 336 responses from specialists in 49 countries explored current medical and surgical strategies for NOA, analyzing results against existing guidelines and offering expert recommendations.
  • Key findings included diverse approaches to hormonal therapy, significant variation in sperm retrieval success rates, and differing protocols around varicocele repair and follicle-stimulating hormone cutoff levels for sperm retrieval.
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Article Synopsis
  • * Conducted from July to September 2022, a questionnaire gathered responses from 367 doctors in 49 countries, focusing on how they diagnose NOA through methods like hormone tests and genetic analyses.
  • * The survey identified that while many practices align with guidelines, significant differences in approaches were found, underscoring the need for standardized, evidence-based international guidelines for NOA evaluation.
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Article Synopsis
  • The study investigates global practices and challenges in using sperm DNA fragmentation (SDF) assays, which can affect male reproductive potential, as outlined in the latest WHO manual.
  • A survey of 436 reproductive clinicians revealed that the most popular SDF assay is TUNEL, with a significant influence from availability on their choices.
  • Clinicians see the value of SDF testing in understanding infertility but face barriers like insufficient professional guidelines and a lack of accepted reference values for interpreting SDF results.
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  • - The study assessed the A10 Cyclone SA + PLUS ejaculation aid as a potential treatment for intravaginal ejaculation disorders, which currently lack approved drug or device options
  • - After 8 weeks of training with the device, 40% of participants were able to achieve intravaginal ejaculation, and there was a notable increase in their satisfaction with ejaculation as measured by a specific questionnaire
  • - The findings suggest that the A10 Cyclone SA + PLUS could be an effective and safe treatment option for those struggling with intravaginal ejaculation disorders, with no significant adverse effects reported
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Article Synopsis
  • The meta-analysis investigates the effects of varicocele repair on semen parameters in infertile males, combining data from diverse studies without language restrictions.
  • A total of 351 studies were analyzed, revealing significant improvements in several semen parameters post-repair, including semen volume, sperm concentration, total sperm count, motility, and morphology, while sperm vitality showed no improvement.
  • This research is the largest of its kind and highlights the benefits of varicocele repair for male infertility, contributing valuable insights for clinical practice.
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Objective: To clarify the circadian rhythm of urination in hospitalized women with nocturia measured by toilet uroflowmetry and its age-related change.

Methods: We evaluated 2602 urinations of 58 female patients (age, 68.4 ± 15.

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Late-onset hypogonadism is generally treated with testosterone replacement treatment. However, the efficacy rate of treatment for patients with low testosterone is not clear because patients without low testosterone are also treated in real-world clinical settings. This study comprised 110 men with low testosterone concentration of <3.

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Reports of Bone Scan Index (BSI) calculations as imaging biomarkers to predict survival in patients with metastatic castration-resistant prostate cancer (mCRPC) have been mainly from retrospective studies. To evaluate the effectiveness of enzalutamide (ENZ) in Japanese patients with mCRPC and bone metastases using BSI (bone scintigraphy) and circulating tumor cell (CTC) analysis. Prospective, single-arm study at Juntendo University affiliated hospitals, Japan.

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Article Synopsis
  • The study investigates global practices for managing sperm DNA fragmentation (SDF) in infertile men, highlighting its impact on fertility and assisted reproductive technology (ART).
  • A survey collecting data from 436 reproductive experts across 55 countries revealed a common recommendation for lifestyle changes and antioxidants, with varying durations for treatment and differing management approaches for specific infertility cases.
  • The findings indicate a lack of uniformity in practices, emphasizing the need for standardized guidelines and expert consensus for treating men with elevated SDF.
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Article Synopsis
  • The study explores global practices for sperm DNA fragmentation (SDF) testing in infertile men, following its inclusion in the WHO laboratory manual.
  • A survey conducted among 436 infertility clinicians across 55 countries reveals varied testing practices, with many testing SDF in cases of unexplained infertility, recurrent pregnancy loss, and among smokers.
  • The findings highlight the need for clearer professional guidelines on SDF testing, given the diversity in current practices and the potential benefits for certain patient populations.
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