Tatsuya Nakatani

Osaka City University, Ōsaka, Ōsaka, Japan

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Publications (354)692.06 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: To examine the difference in improvement of lower urinary tract symptoms between morning and evening dosing of α1 -blocker naftopidil. A total of 177 male patients with nocturia were included in the present study and randomized to morning or evening dosing of naftopidil. The International Prostate Symptom Score, quality of life index and nocturia quality of life index were compared between the two study groups at 12 weeks. A total of 143 patients (morning group: n = 70, evening group: n = 73) were analyzed as a result of the dropout of 34 patients because of failure to give consent, adverse events and failure to attend. Nocturia, quality of life index and nocturia quality of life index at 12 weeks were significantly better in the evening group compared with the morning group. In a multivariate model, both the dosing time of naftopidil and the initial nocturia quality of life index were significantly associated with change in nocturia quality of life index. Evening dosing of naftopidil seems to be more effective in treating nocturia in male patients with lower urinary tract symptoms. © 2014 The Japanese Urological Association.
    International Journal of Urology 11/2014; · 1.73 Impact Factor
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    ABSTRACT: There have been few reports of the differences in safety between the mammalian target of rapamycin inhibitors, everolimus and temsirolimus. The purpose of this study is to compare the adverse event profiles of both agents and to estimate the risk factors for non-infectious pneumonitis in patients with advanced renal cell carcinoma on the basis of our real-world clinical experience.
    International journal of clinical oncology. 10/2014;
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    ABSTRACT: To evaluate the efficacy and safety of imidafenacin (IM), a novel short half-life anticholinergic, as add-on therapy for male LUTS with nocturia and nocturnal polyuria.
    World Journal of Urology 09/2014; · 2.89 Impact Factor
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    ABSTRACT: Using rituximab, we have performed successful ABO-incompatible kidney transplantations in recipients without splenectomy as well as in those with high pretransplant anti-A/B antibody titers. A common and increasingly recognized toxicity of rituximab is late-onset neutropenia (LON), defined as unexplained grade III to IV neutropenia occurring at least 4weeks after the last dose of rituximab in the absence of an alternative explanation.
    Transplant Immunology 06/2014; · 1.52 Impact Factor
  • Taro Iguchi, Tatsuya Nakatani
    International Journal of Urology 05/2014; · 1.73 Impact Factor
  • Toshihide Naganuma, Tatsuya Nakatani
    International Journal of Urology 05/2014; · 1.73 Impact Factor
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    ABSTRACT: Background/Aim: The aim of the present study was to quantitatively examine factors associated with aortic calcification in non-dialysis CKD patients. Methods: We quantitatively investigated aortic calcification from the renal artery to the bifurcation in 149 non-dialysis CKD patients (58±16 years; 96 males and 53 females, 48 diabetics; eGFR 40.3±29.3 ml/min), and measured Agatston scores using multi-slice computed tomography. Result: Of 149 patients, aortic calcification was present in 117. In patients with aortic calcification, age (p<0.001), C-reactive protein (p<0.001), and intact-PTH (p < 0.001) were significantly higher, estimated glomerular filtration rate (eGFR) was significantly lower (p<0.001), and diabetes was observed more often (p<0.05). In regards to the degree of aortic calcification, the Agatston scores correlated significantly and positively with age (ρ=0.438, p<0.001) and serum phosphate (ρ=0.208, p=0.024), and correlated significantly but negatively with e-GFR (ρ=-0.353, p<0.001). In multiple regression analysis, eGFR was associated significantly and independently with the log [Agatston score] (β=-0.346, p<0.01), after adjustment for several confounders including serum phosphate and the presence of diabetes. Conclusions: Hyperphospatemia, chronic inflammation, diabetes, and decreased GFR are associated significantly with the presence of aortic calcification in non-dialysis CKD patients. Decreased eGFR was associated significantly and independently with the quantitative degree of aortic calcification. © 2014 S. Karger AG, Basel.
    Kidney and Blood Pressure Research 04/2014; 38(2-3):196-204. · 1.60 Impact Factor
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    ABSTRACT: BACKGROUNDNEDD9 is one of the Crk-associated substrate (Cas) family proteins that mediate downstream signaling processes including cytoskeletal organization, cell-cycle and tumorigenesis. While NEDD9 plays a crucial role in epithelial–mesenchymal transition (EMT), the functional mechanism underlying NEDD9-mediated EMT in prostate cancer (PCa) remains uncertain.METHODS The expression levels of NEDD9 and its downstream molecules in PC-3, LNCaP, and VCaP cells exposed to transforming growth factor-β (TGF-β) were determined by western blotting. The invasion of these cells with ectopic overexpression of NEDD9 or silencing of NEDD9 expression was measured by transwell invasion assay. Human tissue samples comprising 45 PCa specimens and ten specimens of normal prostatic tissue were used for immunohistochemical (IHC) analysis of NEDD9 expression.RESULTSBoth NEDD9 and its downstream signaling molecules associated with EMT were strongly induced by TGF-β in PCa cells. PC-3 cells with stable overexpression of NEDD9 had a mesenchymal phenotype and significantly enhanced cell invasion, despite their decreased cell proliferation. Knockdown of endogenous NEDD9 expression completely diminished TGF-β-triggered tumor invasion in several PCa cell lines. The IHC data revealed a significant positive correlation between the NEDD9 staining score and tumor aggressiveness (e.g., Gleason grade, serum PSA level). The NEDD9 staining score in primary PCa with bone metastasis was significantly higher than that in PCa without metastasis.CONCLUSIONSNEDD9 may be a key mediator involved in TGF-β-mediated EMT and cell motility in PCa cells and a novel target in the treatment of metastatic PCa and prevention of spread of localized PCa cells to other organs. Prostate © 2014 Wiley Periodicals, Inc.
    The Prostate 04/2014; · 3.84 Impact Factor
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    ABSTRACT: The adverse effects of tacrolimus are known to play major roles in new-onset diabetes after transplantation. The purpose of this study was to investigate the effects of conversion from a twice-daily tacrolimus (Tac-BID) to a once-daily tacrolimus (Tac-OD) on glucose metabolism in stable kidney transplant recipients. Twenty-six patients were converted from Tac-BID to Tac-OD on a 1:1 mg basis and examined for its effects on glucose metabolism. Unless rejection or tacrolimus toxicity was suspected, we did not perform dose adjustments of Tac-OD or reconversion to Tac-BID until 4 weeks after conversion. Subsequent dose adjustments were allowed to maintain tacrolimus target trough concentration within the. Changes in clinical parameters were compared between baseline and 24 weeks after conversion. Conversion from Tac-BID to Tac-OD on a 1:1 mg basis resulted in a significant decrease in tacrolimus trough level at 4 weeks after conversion. Because dose adjustments were performed, the trough level did not differ significantly between baseline and 24 weeks after conversion. At 4 and 24 weeks after conversion, the homeostasis model assessment of pancreas β-cell function (HOMA-β) increased significantly. Although there was no change in tacrolimus trough level between baseline and 24 weeks after transplantation, HOMA-β at 24 weeks after conversion was significantly higher than that at baseline. These results indicated that conversion from Tac-BID to Tac-OD may improve pancreas β-cell function in kidney transplant recipients.
    Transplantation Proceedings 03/2014; 46(2):532-6. · 0.95 Impact Factor
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    ABSTRACT: Background: In clinical trials with no upper age limit, the proportion of older patients is usually small, probably reflecting the more conservative approach adopted by clinicians when treating the elderly. An exploratory analysis of elderly patients in the RECORD-1 Trial showed that patients ≥ 65 y.o. had superior median PFS than overall RECORD-1 population (5.4 months and 4.9 months, respectively). We investigated the efficacy, relative benefit and safety of Everolimus (EVE) as sequential therapy after failure of VEGFr-TKI therapy for older patients with metastatic renal cell cancer (mRCC), in daily practice. Materials and Methods: 172 consecutive IRB approved patients with mRCC (median age 65, M:F 135/37, 78% clear cell) who received salvage EVE at 39 tertiary institutions between October 2009 and August 2011 were included in this analysis. Some 31% had progressed on sunitinib, 22% on sorafenib, 1% on axitinib, 41% on sequential therapy, and 5% had received other therapy. Patients with brain metastases were not included and 95% of the patients had a ECOG (Eastern Cooperative Oncology Group) performance status (PS) of 0 or 1. Previous radiotherapy was an exclusion criterion, but prior chemotherapy was permitted. Adequate organ function and hematologic parameters were mandatory. EVE administration was approved by the institutional review board at each participating institution and signed informed consent was obtained from all patients. Results: Median time of the whole cohort to last follow-up was 3.5 months (range 0.4-15.2 months). Forty four percent were continuing to take EVE at last follow- up. There were 86 (50%) patients ≥ 65 y.o. and 86 (50%) <65 y.o. The percentage of patients who showed PR/ SD was higher in the older group than in the younger one (5.9%/61.2% vs 1.2%/46.5%, respectively). Median survival of older patients was also significantly longer (3.5 +/- 0.31 vs 3.1 +/- 0.34, hazard ratio=0.45, CI; 0.255- 0.802). Analysis using Cox regression model adjusted for gender, PS, number of metastases, site of metastases, histology, smoking history and age detected an association between age and PFS (p=0.011). The frequency of adverse events in elderly patients treated with EVE was no greater than that in younger patients, although such toxicity may have had a greater impact on their quality of life. Conclusions: Older patients should not generally be excluded from accepted therapies (mTOR inhibitors after failure of VEGFr-TKI therapy) for mRCC.
    Asian Pacific journal of cancer prevention: APJCP 02/2014; 15(4):1811-1815. · 1.50 Impact Factor
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    ABSTRACT: Background Recent studies have indicated that angiotensinogen (AGT) is also locally produced in the kidney and that urinary AGT is a marker of local renal renin-angiotensin system activation. Because urinary AGT levels are significantly higher in patients with chronic kidney disease (CKD) than in patients without CKD and correlate with urinary albumin and other levels, urinary AGT is increasingly recognized as a marker for CKD monitoring, prognosis, and treatment. In this study, we investigated urinary AGT levels in renal transplant recipients. Methods Among the patients who were treated as outpatients at the Department of Urology of Osaka City University Hospital from March 2012 to April 2013, 146 stable renal transplant recipients and 50 donors who gave informed consent were studied. Urinary AGT and creatinine (Cr) levels were measured. The urinary AGT-to-Cr ratio was calculated, and its correlation with clinical parameters was examined. Results The urinary AGT-to-Cr ratio of the renal transplant recipients was significantly higher than that of the renal transplant donors (P = .0143). Furthermore, the urinary AGT-to-Cr ratio had a significantly positive correlation with the urinary albumin-to-Cr ratio (ACR; r = 0.39, P < .0001), while on the other hand, it had a significantly negative correlation with estimated glomerular filtration rate (eGFR; r = −0.31, P = .0002). Multiple linear regression analysis of factors associated with eGFR showed that urinary AGT was a significant and independent factor after adjusting for age, sex, and ACR. Conclusions Our results indicated that urinary AGT levels were elevated in renal transplant recipients. In addition, urinary AGT significantly correlated with renal function and degree of albuminuria.
    Transplantation Proceedings 01/2014; 46(2):489–491. · 0.95 Impact Factor
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    ABSTRACT: Aims The renin-angiotensin system (RAS) plays an important role in the pathogenesis of diabetic nephropathy. The aim of the present study was to investigate intrarenal RAS activity in patients with type 2 diabetes (T2DM). Methods We measured urinary angiotensinogen, a reliable biomarker of intrarenal RAS activity, in 14 controls without T2DM, 25 T2DM patients without nephropathy, 11 chronic kidney disease (CKD) patients without T2DM and 46 CKD patients with T2DM. Associations between urinary angiotensinogen and clinical parameters were examined. Results Compared with the controls, urinary [angiotensinogen:creatinine] were significantly higher in T2DM patients without nephropathy (4.70 ± 2.22 vs. 8.31 ± 5.27 μg/g, p = 0.037). Age, hemoglobin A1c (HbA1c) and fasting plasma glucose correlated significantly and positively with the log{urinary [angiotensinogen:creatinine]} (r = 0.632, p = 0.007; r = 0.405, p = 0.027; r = 0.583, p = 0.003, respectively) in T2DM patients without nephropathy. In contrast, the urinary [angiotensinogen:creatinine] were not significantly different between CKD patients with and without T2DM (22.7 ± 27.8 vs. 33.5 ± 40.8 μg/g, p =0.740); although they were significantly higher when compared with non-CKD patients. In the CKD patients with T2DM systolic blood pressure, serum creatinine, estimated glomerular filtration rate and urinary [albumin:creatinine] correlated significantly with the log{urinary [angiotensinogen:creatinine]} (r = 0.412, p = 0.004; r = 0.308, p = 0.037; r= -0.382, p = 0.001, r = 0.648, p < 0.001, respectively). Conclusions Our findings indicate that poor glycemic control is significantly associated with intrarenal RAS activity in T2DM patients without nephropathy, and that decreased renal function is significantly associated with intrarenal RAS activity in CKD patients with T2DM.
    Diabetes Research and Clinical Practice. 01/2014;
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    ABSTRACT: To analyse and then generalize the mechanism by which partial or complete response is achieved among a limited number of patients with metastatic renal cell carcinoma (RCC) treated with interferon or interleukin‐2.
    BJU International 01/2014; 113(2). · 3.05 Impact Factor
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    ABSTRACT: A 62-year-old man was referred to our hospital for an axillary mass. Computed tomography (CT) revealed a right axillary tumor and a left renal tumor. Needle biopsies of lung tumor and renal tumor were performed, but a definite diagnosis was impossible. Because his performance status worsened and the lung tumor grew day by day, chemotherapy with gemcitabine and cisplatin was started without definite diagnosis. However, the chemotherapy could not be continued because of interstitial pneumonia and the patient died because of the progression of disease. The final histopathologic diagnosis was pulmonary pleomorphic carcinoma based on immunohistochemical staining.
    Urology Case Reports. 01/2014;
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    ABSTRACT: A recent report has demonstrated that as with mycophenolate mofetil (MMF), everolimus is capable of inhibiting human B-lymphocyte function and activation including B-lymphocyte proliferation, apoptosis, and immunoglobulin production in vitro. Everolimus may therefore be used as an immunosuppressant in ABO-incompatible kidney transplantation. A three-month pilot study was performed to examine the efficacy and safety of conversion of stable ABO-incompatible kidney transplant recipients from MMF with standard exposure calcineurin inhibitors (CNIs) to everolimus with very low exposure CNIs. Sixteen recipients were enrolled in the study. The patients without acute rejection by graft biopsy were switched from MMF to everolimus with CNI minimization. At three months after conversion, graft biopsies were performed to check for acute rejection and C4d deposition. Conversion to everolimus with CNI minimization for three months did not induce acute rejection and C4d deposition in all of the ABO-incompatible kidney transplant recipients. A slight elevation of anti-A/B antibody titer occurred in our present study. Everolimus was associated with hyperlipidemia and edema. These results demonstrated that short-term conversion from MMF to everolimus after one yr post-transplant may be a safe and effective alternate for ABO-incompatible kidney transplant recipients requiring temporary discontinuation of MMF.
    Clinical Transplantation 12/2013; · 1.63 Impact Factor
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    ABSTRACT: Objective Serum creatinine levels are lower in diabetic patients compared with their non-diabetic counterparts. Therefore, estimated glomerular filtration rate (eGFR) is higher in the former than in the latter group. Factors associated with overestimation of renal function in diabetic patients were examined, and new formulae reflecting precise eGFR were created.Research Design and Methods Eighty subjects (age 56.5±15.4 years; 35 males (43.8%); 40 diabetics and 40 non-diabetics subjects) were enrolled. GFR was evaluated by inulin clearance (Cin). eGFR values were calculated based on serum creatinine and/or serum cystatin C levels. The factors related to the dissociation between eGFR and Cin in diabetic patients and the agreement between each of three eGFR and Cin were compared.ResultsAlthough Cin was not significantly different between the diabetic and non- diabetic subjects (p=0.2866), each of three eGFR measures from the diabetic patients was significantly higher than that of the non-diabetic subjects (p<0.01). There were significant and positive correlations between the ratio of each eGFR/Cin, hemoglobin A1c and glycated albumin. The intraclass correlation coefficients in diabetic patients were weaker than those in the non-diabetic subjects, and the intercepts of the regression lines between each eGFR measure and Cin in the diabetic patients were significantly higher than those of the non-diabetic subjects. New formulae for the calculation of eGFR corrected by the glycemic control indices were better than the original eGFR, particularly in diabetic patients.ConclusionseGFR overestimates Cin as glycemic controls worsen. eGFR corrected by hemoglobin A1c is considered to be clinically useful and feasible.
    Diabetes care 10/2013; · 7.74 Impact Factor
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    ABSTRACT: The aim of the study was to assess the safety and efficacy of everolimus therapy for advanced renal cell carcinoma in Japanese patients receiving real-world care. Patients who had been treated with everolimus for advanced renal cell carcinoma at 39 Japanese medical centers between January 2010 and November 2011 were retrospectively investigated to assess adverse events and the time to treatment failure. A total of 180 patients were identified. Their median age was 65 years (range 23-93). The median time to treatment failure was 2.9 months (95% confidence interval 2.4-3.4). The median time to treatment failure was significantly longer in patients with dose modification (4.2 months; 95% confidence interval 3.4-5.0) than in patients without dose modification (1.7 months; 95% confidence interval 1.0-2.3; P < 0.01) after experiencing adverse events. Stomatitis (44%) was the most frequent adverse event, followed by thrombocytopenia (31%), anemia (22%), interstitial pneumonia (22%) and hyperglycemia (17%). Interstitial pneumonia was the most frequent cause of discontinuation in patients who discontinued everolimus due to intolerability regardless of the dose modification status. None of the patients with dose modification of everolimus discontinued everolimus due to thrombocytopenia or leukopenia. The adverse event profile of everolimus may differ between Japanese and Caucasian patients. Dose modification of everolimus might be associated with longer treatment duration in patients with advanced renal cell carcinoma. Further studies are required to clarify this association. Interstitial pneumonia may be difficult to overcome by dose modification.
    Japanese Journal of Clinical Oncology 09/2013; · 1.90 Impact Factor
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    ABSTRACT: BACKGROUND: Cerebral white matter hyperintensities (WMHs), comprised of periventricular hyperintensity (PVH) and deep and subcortical white matter hyperintensity (DSWMH), have been presumed to be predictors for future stroke, cognitive impairment and dementia in the general population. However, no longitudinal studies have been performed to determine the clinical significance of WMHs in hemodialysis (HD) patients. In the present study, we investigated the influence of WMHs as a predictor of future cardiovascular disease in HD patients. METHODS: Cranial magnetic resonance imaging was performed on 179 HD patients with no past history of stroke from April 2006 to October 2009, and the prevalence of WMHs was investigated. The patients were followed prospectively until March 2012 or death or renal transplantation. The influence of WMHs on cardiovascular events was investigated using the Kaplan-Meier method and Cox proportional hazards analysis. RESULTS: The patients with advanced PVH and DSWMH had a significantly higher incidence of cardiovascular morbidity than those without advanced PVH and DSWMH by Kaplan-Meier analysis. By multivariate Cox proportional hazards analysis, the presence of advanced PVH and DSWMH increased the risk of cardiovascular events, independent of other cardiovascular risk factors. In addition, the present study revealed that of the subtypes of WMHs, PVH was a stronger predictor of cardiovascular events compared to DSWMH. CONCLUSIONS: The present study indicates that the presence of WMHs is a novel predictor of cardiovascular events in HD patients, and that PVH is more closely associated with incident cardiovascular disease.
    Nephrology 06/2013; · 1.69 Impact Factor
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    ABSTRACT: BACKGROUND: Although new-onset diabetes after transplantation has been demonstrated to have a significant negative impact on allograft and patient survival, the role of glucose intolerance (impaired fasting glucose [IFG] and/or impaired glucose tolerance [IGT], as asymptomatic hyperglycemia and borderline diabetes, has not been identified in renal transplant recipients. METHODS: We enrolled 32 renal transplant recipients (at least 1year after transplantation) without prior evidence of diabetes at our institution in this study. Transplant recipients were divided into 2 groups (normal glucose tolerance group and glucose intolerance group) according to the results of their oral glucose tolerance test with 75 g of glucose. Glucose intolerance included IFG, IGT, and IFG/IGT. Normal glucose tolerance was detected in 19 patients, and glucose intolerance in 13: had 6 IGT, 2 IFG, and 5 IGT/IFG. Bilateral brachial-ankle pulse-wave velocity (baPWV) and intimal-media thickness (IMT) measured as markers of atherosclerosis were compared between the 2 groups. Insulin resistance was estimated with the homeostasis model assessment of insulin resistance (HOMA-R), and pancreatic β-cell function evaluated by the homeostasis model assessment of β-cell function and insulinogenic index. RESULTS: The patients in the glucose intolerance group showed significantly greater baPWV and IMT than those in the normal glucose tolerance group. HOMA-R in the glucose intolerance patients was significantly higher than in the normal glucose tolerance patients. Linear regression analysis showed the increased IMT in the renal transplant recipients to be significantly correlated with HOMA-R. CONCLUSIONS: Renal transplant recipients with glucose intolerance had increased IMT and baPWV, suggesting that glucose intolerance in renal transplant recipients may induce atherosclerosis and that the rise in insulin resistance may contribute to the increased IMT in renal transplant recipients.
    Transplantation Proceedings 05/2013; 45(4):1535-1539. · 0.95 Impact Factor
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    ABSTRACT: BACKGROUND: Several reports have suggested an association between hepatitis C virus (HCV) infection and new-onset diabetes after transplantation (NODAT). NODAT is a common complication after renal transplantation, and it has been associated with increased long-term morbidity and mortality. HCV-positive recipients may have abnormal glucose metabolism, even though NODAT has never been previously diagnosed. The aim of this study was to analyze the pathogenic factors responsible for glucose metabolism in a series of HCV-positive renal transplant recipients. METHODS: The study population comprised 16 renal transplant patients who received their grafts from deceased or living donors with anti-HCV antibodies. HCV-negative transplant recipients were individually matched with these HCV-positive recipients by year of transplantation, sex, age, serum creatinine levels, and type of calcineurin inhibitors. None of the patients had been diagnosed with diabetes. Insulin secretion and insulin resistance were determined by a 75-g oral glucose tolerance test (OGTT) and compared between the 2 groups. Categories of glucose tolerance were defined according to World Health Organization criteria. RESULTS: Glucose intolerance (impaired fasting glucose, impaired glucose tolerance, diabetes mellitus) as assessed by OGTT was detected in 7 of the HCV-positive recipients (43.8%) and 3 of the HCV-negative recipients. The homeostasis model assessment of insulin resistance was greater in the HCV-positive recipients than in the HCV-negative recipients. The homeostasis model assessment of β-cell function was higher in the HCV-positive recipients than in the HCV-negative recipients. CONCLUSIONS: The frequency of glucose intolerance tended to be higher in HCV-positive recipients. Furthermore, insulin resistance was greater and insulin secretion higher in HCV-positive recipients, which indicated that the increase in insulin secretion compensated for insulin resistance observed in these patients. However, HCV-positive renal transplant recipients may ultimately develop NODAT as this compensation diminishes with time.
    Transplantation Proceedings 05/2013; 45(4):1540-1543. · 0.95 Impact Factor

Publication Stats

2k Citations
692.06 Total Impact Points


  • 1998–2014
    • Osaka City University
      • • Department of Urology
      • • Department of Metabolism, Endocrinology, and Molecular Medicine
      • • Graduate School of Medicine
      Ōsaka, Ōsaka, Japan
    • Osaka City General Hospital
      Ōsaka, Ōsaka, Japan
  • 2002–2013
    • Kinki University
      • • Faculty of Medicine
      • • Department of Gastroenterology and Hepatology
      Ōsaka-shi, Osaka-fu, Japan
  • 2008
    • State University of New York Upstate Medical University
      • Department of Urology
      Syracuse, NY, United States
  • 2005–2008
    • Claude Bernard University Lyon 1
      Villeurbanne, Rhône-Alpes, France
  • 2004
    • Mazda Hospital, Fuchu
      Фучу, Hiroshima, Japan
  • 2003
    • Shirasagi Hospital
      Ōsaka, Ōsaka, Japan
  • 2000
    • Izumi City Hospital
      Ōsaka, Ōsaka, Japan