Yoichi Arai

Tohoku University, Sendai-shi, Miyagi, Japan

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Publications (421)1305.93 Total impact

  • No preview · Article · Jan 2016 · Hypertension
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    ABSTRACT: Objectives: To characterize the site and clinical implications of intravesical recurrence after radical nephroureterectomy for upper urinary tract urothelial carcinoma. Methods: Patients who underwent radical nephroureterectomy for upper urinary tract urothelial carcinoma between 2000 and 2011 at 12 institutions participating in the Tohoku Urological Evidence-Based Medicine Study Group were included in the present study. Those who underwent prior or simultaneous radical cystectomy were excluded. The site of intravesical recurrence was investigated, and the survival curves after radical nephroureterectomy were analyzed retrospectively using the Kaplan-Meier method. Multivariate analyses of factors predicting survival were carried out. Results: A total of 534 patients were eligible for the present study. With a median follow up of 47 months, 205 patients (38.4%) had intravesical recurrence. The intravesical recurrence-free survival rates at 1, 2, and 5 years were 74.6%, 62.5% and 56.3%, respectively. In a subset of 137 patients with intravesical recurrence who did not have bladder cancer before or at the diagnosis of upper urinary tract urothelial carcinoma, the most frequent site of intravesical recurrence was around the cystotomy (52.6%), followed by at the posterior wall (39.4%) and at the bladder neck (35.8%). A total of 36 patients (17.6%) developed muscle-invasive bladder cancer after radical nephroureterectomy. On multivariate analyses for the subset of patients with non-muscle invasive (≤pT1) upper urinary tract urothelial carcinoma, intravesical recurrence was an independent predictor of cancer-specific survival (HR 4.27, P = 0.016) and overall survival (HR 3.00, P = 0.018). Conclusions: Most intravesical recurrences occur around the site of bladder mucosal injury within 1 year after radical nephroureterectomy, providing important insight into the mechanism of intravesical recurrence. Intravesical recurrence after radical nephroureterectomy had an impact on oncological outcomes of patients with non-muscle invasive upper urinary tract urothelial carcinoma.
    No preview · Article · Jan 2016 · International Journal of Urology
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    ABSTRACT: Purpose: Pelvic organ cross sensitization is considered to contribute to overlapping symptoms in CPPS. Overexpression of NGF in the bladder is reportedly involved in the symptom development of BPS/IC patients. This study examined whether a reduction of overexpressed NGF in the bladder by intravesical treatment with liposome and OND conjugates ameliorates bladder hypersensitivity in a rat colitis model. Materials and methods: Adult female rats were divided into; (a) a control group, (b) a colitis-OND group with intracolonic TNBS enema and intravesical liposomal-OND treatments, (c) a colitis-saline group with intracolonic TNBS and intravesical saline treatments, (d) a sham-OND group with intravesical liposomal-OND treatment without colitis and (e) a sham-saline group with intravesical saline treatment without colitis. Liposomes conjugated with NGF antisense OND or saline solution were instilled into the bladder, and 24 hours later, colitis was induced by TNBS enema. Effects of NGF antisense treatment were evaluated by pain behavior, cystometry, molecular analyses and immunohistochemistry 10 days after TNBS treatment. Results: In colitis-OND rats, the NGF antisense treatment ameliorated pain behavior, and decreased a reduction in intercontraction intervals in response to acetic acid stimulation as well as NGF expression in the bladder mucosa, which were all enhanced in colitis-saline rats compared to sham rats. Conclusions: NGF overexpression in the bladder mucosa and bladder hypersensitivity induced after colitis were reduced by intravesical application of liposomal OND targeting NGF, suggesting that the local anti-NGF therapy could be effective for the treatment of bladder symptoms in CPPS.
    No preview · Article · Jan 2016 · The Journal of urology
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    Full-text · Dataset · Jan 2016
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    ABSTRACT: Several of the procarcinogens inhaled in tobacco smoke, the primary risk factor for bladder cancer, are activated by CYP2A6. The association between the whole-gene deletion of CYP2A6 (CYP2A6*4) and a reduced risk of bladder cancer was suggested in Chinese Han smokers. However, there is no evidence for association between the risk of bladder cancer and CYP2A6 genotypes in the Japanese population. Using genomic DNA from smokers of the Japanese population (163 bladder cancer patients and 116 controls), we conducted a case-control study to assess the association between CYP2A6 polymorphisms and the risk of bladder cancer. Determination of CYP2A6 genotypes was carried out by amplifying each exon of CYP2A6 using polymerase chain reaction (PCR) and Sanger sequencing. The CYP2A6*4 allele was identified by an allele-specific PCR assay. Bladder cancer risk was evaluated using the activity score (AS) system based on CYP2A6 genotypes. The odds ratios (95% confidence interval) for the AS 0, AS 0.5, AS 1.0, and AS 1.5 groups were 0.46 (0.12-1.83), 0.43 (0.15-1.25), 0.86 (0.40-1.86), and 1.36 (0.60-3.06), respectively. In conclusion, although decreased CYP2A6 AS tended to reduce the risk of bladder cancer in Japanese smokers, no significant association was recognized in this population. However, given the relatively small size of the sample, further study is required to conclude the lack of a statistically significant association between CYP2A6 genotypes and the risk of bladder cancer.
    Full-text · Article · Jan 2016 · Biological & Pharmaceutical Bulletin
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    ABSTRACT: Ductal adenocarcinoma is an unusual variant of adenocarcinoma of the prostate with a poorly understood natural history, and its treatment is not well defined. Ductal adenocarcinoma is often diagnosed at an advanced stage, because no specific tumor markers are known. Docetaxel has been used for acinar adenocarcinoma of the prostate, a common type of prostate cancer, but it is largely ineffective for ductal adenocarcinoma. Earlier studies suggested that the chemotherapy with gemcitabine and cisplatin might be effective for ductal adenocarcinoma. Here we report two patients with ductal adenocarcinoma of the prostate that did not respond to docetaxel, but responded to the gemcitabine/cisplatin chemotherapy. Patient 1 was a 59-year-old man who had lung metastasis despite androgen deprivation therapy with undetectable levels of prostate-specific antigen and who presented with brain metastasis during docetaxel chemotherapy. Pathological examination of the resected brain tumor revealed ductal adenocarcinoma with positive immunostaining for carcinoembryonic antigen. The gemcitabine/cisplatin chemotherapy achieved partial response of the lung metastasis with serum carcinoembryonic antigen levels decreasing from 11.4 ng/mL to 2.9 ng/mL. Patient 2 was a 69-year-old man with lung metastasis. Local progression appeared during androgen deprivation therapy, and the subsequent transurethral biopsy revealed ductal adenocarcinoma with positive immunostaining for neuron-specific enolase. Bone and distant lymph node metastasis appeared despite docetaxel chemotherapy. Six courses of the gemcitabine/cisplatin chemotherapy achieved partial response of metastatic lesions, with serum neuron-specific enolase levels decreasing from 118 ng/mL to 2.6 ng/mL. The gemcitabine/cisplatin chemotherapy is a potential option for treatment of advanced ductal adenocarcinoma of the prostate.
    Preview · Article · Dec 2015 · The Tohoku Journal of Experimental Medicine
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    ABSTRACT: Introduction: Cytochrome P450 11B2 (CYP11B2) plays a pivotal role in aldosterone synthesis, while cytochrome P450 11B1 (CYP11B1) and cytochrome P450 17A1 (CYP17) are involved in cortisol synthesis in normal human adrenal glands. However, their detailed distribution in aldosterone-producing adenoma (APA) remains incompletely settled. Materials and methods: We examined the status of CYP11B1/CYP11B2 and CYP11B2/CYP17A1 expressions in 27 APA (double staining) cases and 21 APA (triple staining) cases by using immunofluorescence staining and semi-quantitative evaluation. Results: Tumor cells co-expressing CYP11B1/B2 (hybrid cell type A), CYP11B2/17 (hybrid cell type B), CYP11B1/17 (hybrid cell type C), and CYP11B1/B2/17 (triple-positive cells) were identified. The area and cell number of these cells were relatively small, but size of individual hybrid cells were different between three hybrid cell types (A/B/C) and triple-positive cells. Conclusion: The presence of hybrid cells indicated the marked intratumoral heterogeneity of steroidogenesis in APAs, particularly in those producing glucocorticoids and mineralocorticoids.
    No preview · Article · Nov 2015 · Molecular and Cellular Endocrinology
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    ABSTRACT: Background: To improve antitumor effects against metastatic renal cell carcinoma (mRCC), use of molecular target-based drugs in sequential or combination therapy has been advocated. In combination therapy, interferon (IFN)-α amplified the effect of sorafenib in our murine model (J Urol 184:2549, 2010), and cytokine-treated mRCC patients in Japan had good prognoses (Eur Urol 57:317, 2010). We thus conducted a phase II clinical trial of sorafenib plus IFN-α for untreated mRCC patients in Japan. Methods: In this multicenter, prospective study, provisionally registered patients with histologically confirmed metastatic clear cell RCC received natural IFN-α (3 dosages of 3 million U per week) for 2 weeks. Only IFN-α-tolerant patients were registered to this trial, and treated additionally with oral sorafenib (400 mg, bid). The primary end point of the study was rate of response (CR + PR) to sorafenib plus IFN-α treatment assessed using RECIST v1.0. The secondary end points were disease control rate (CR + PR + SD), progression free survival (PFS), overall survival (OS), and safety of the combined treatment. PFS and OS curves were plotted using the Kaplan-Meier method. Results: From July 2009 to July 2012, a total of 53 untreated patients were provisionally registered, and 51 patients were finally registered. Rate of Response to the combined therapy of sorafenib plus IFN-α was 26.2 % (11/42) (CR 1, PR 10). The median PFS was 10.1 months (95 % CI, 6.4 to 18.5 months), and the median OS has not been reached yet. The combined therapy increased neither the incidence of adverse effects (AE) nor the incidence of unexpected AE. A limitation was that a relatively high number of patients (9 patients) were excluded for eligibility criteria violations. Conclusion: Our data have demonstrated that sorafenib plus IFN-α treatment is safe and effective for untreated mRCC patients.
    Full-text · Article · Oct 2015 · BMC Cancer
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    ABSTRACT: To assess the risk factors for biochemical recurrence in D'Amico intermediate-risk prostate cancer patients treated using radical prostatectomy. We retrospectively reviewed the medical records of 1268 men with prostate cancer treated using radical prostatectomy without neoadjuvant therapy. The association between various risk factors and biochemical recurrence was then statistically evaluated. The Kaplan-Meier method, log-rank tests and Cox proportional hazards models were used for statistical analysis. In the intermediate-risk group, 96 patients (14.5%) experienced biochemical recurrence during a median follow up of 41 months. In the intermediate-risk group, preoperative prostate-specific antigen level, prostate volume and prostate-specific antigen density were significant preoperative risk factors for biochemical recurrence, whereas other factors including age, primary Gleason 4, clinical stage >T2 and percentage of positive biopsies were not. In multivariate analysis, higher preoperative prostate-specific antigen level and density, and a smaller prostate volume were independent risk factors for biochemical recurrence in the intermediate-risk group. Biochemical recurrence-free survival of patients in the intermediate-risk group with a higher prostate-specific antigen level and density (≥15 ng/mL, ≥0.6 ng/mL/cm(3) , respectively), and lower prostate volume (≤10 mL) was comparable with that of high-risk group individuals (P = 0.632, 0.494 and 0.961, respectively). Preoperative prostate-specific antigen, prostate volume and prostate-specific antigen density are significant risk factors for biochemical recurrence in D'Amico intermediate-risk prostate cancer patients treated using radical prostatectomy. Using these variables, a subset of the intermediate-risk patients can be identified as having equivalent outcomes to high-risk patients. © 2015 The Japanese Urological Association.
    No preview · Article · Aug 2015 · International Journal of Urology
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    ABSTRACT: Adrenal venous sampling (AVS) is critical to determine the subtype of primary aldosteronism (PA). "Central" AVS, that is, the collection of effluents from bilateral adrenal central veins, sometimes does not allow differentiation between bilateral aldosterone-producing adenomas (APA) and idiopathic hyperaldosteronism (IHA). To establish the best treatment course, we have developed "segmental AVS"; that is, we collect effluents from the tributaries of central veins to determine the intra-adrenal sources of aldosterone overproduction. We then evaluated the clinical utility of this novel approach in the diagnosis and treatment of PA. We performed central and/or segmental AVS in 297 PA patients, and assessed the accuracy of diagnosis based on the results of central (n=138, 46.5%) and segmental AVS (n=159, 53.5%) by comparison with those of clinicopathological evaluation of resected specimens. Segmental AVS demonstrated both elevated and attenuated secretion of aldosterone from APA and non-tumorous segments, respectively, in patients with bilateral APA and recurrent APA. These findings were completely confirmed by detailed histopathological examination after surgery. Segmental AVS, but not central AVS, also served to identify APA located distal from the central vein. Compared to central AVS, segmental AVS served to identify APA in some patients and its use should expand the pool of patients eligible for adrenal sparing surgery through the identification of unaffected segments, despite the fact that segmental AVS requires more expertise and time. Especially, this new technique could enormously benefit patients with bilateral or recurrent APA because of the preservation of non-tumorous glandular tissue.
    No preview · Article · Jul 2015 · European Journal of Endocrinology
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    ABSTRACT: Adrenocortical carcinoma (ACC) is a malignant neoplasm often associated with an aggressive biological behavior. The histologic differentiation between ACC and adrenocortical adenoma (ACA) is largely determined by employing the Weiss criteria, although this classification may not apply to all the cases. Additionally, various genomic features of ACC could be an auxiliary mode to establish the diagnosis of ACC. Most ACC cases are hormonally functional, and immunohistochemical analysis of steroidogenic enzymes has provided pivotal information as to the analysis of intratumoral production of corticosteroids. This article summarizes the current status of the histopathological diagnosis, molecular pathogenesis, and hormonal features of ACC. Copyright © 2015 Elsevier Inc. All rights reserved.
    Full-text · Article · Jun 2015 · Endocrinology & Metabolism Clinics of North America
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    ABSTRACT: To clarify the significance of the International Germ Cell Cancer Collaborative Group classification in the 2000s, especially in intermediate- and poor-prognosis testicular germ cell tumor in Japan. We retrospectively analyzed 117 patients with intermediate- and poor-prognosis testicular non-seminomatous germ cell tumor treated at five university hospitals in Japan between 2000 and 2010. Data collected included age, levels of tumor markers, spread to non-pulmonary visceral metastases, treatment details and survival. The median follow-up period of all patients was 57 months. A total of 50 patients (43%) were classified as having intermediate prognosis, and 67 patients (57%) as poor prognosis according to the International Germ Cell Cancer Collaborative Group classification. As first-line chemotherapy, 92 patients (79%) received bleomycin, etoposide and cisplatin. Of all patients, 74 patients (63%) received second-line chemotherapy. The most commonly used second-line chemotherapy regimens were a combination of taxanes, ifosfamide and platinum in 49 cases (66%). Overall, 33 patients (28%) received third-line chemotherapy. A total of 88 patients (75%) underwent post-chemotherapy surgery. The 5-year overall survival for intermediate (n = 50) and poor prognosis (n = 67) was 89% and 83% (P = 0.21), respectively. In poor prognosis patients, patients with two or more risk factors (any of high lactic dehydrogenase, alpha-fetoprotein and human chorionic gonadotropin levels, and presence of non-pulmonary visceral metastases) had significantly worse survival than those with only one risk factor (71% and 91%, respectively, P = 0.01). The 5-year overall survivals of poor-prognosis testicular non-seminomatous germ cell tumor patients reached 83%. Further stratification of poor-prognosis patients based on a number of risk factors has the potential to further identify those with poorer prognosis. © 2015 The Japanese Urological Association.
    No preview · Article · Jun 2015 · International Journal of Urology
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    ABSTRACT: Prostate needle biopsy plays a pivotal role not only in the diagnosis but also the management of patients with prostate cancer. Prostate cancer is often multifocal and diagnosis of the lesion could therefore be difficult with diagnostic imaging only; thus, multiple core biopsies are taken from several different regions of the prostate. In current practice, 10- or 12-core needle biopsy is considered the clinical standard. Several techniques have been reported to improve the orientation of the specimens, but tissue marking, which could theoretically provide important information on the location of the lesion in the prostate, has been rarely reported. Therefore, in this study, we evaluated the clinical significance of systematic 12-core needle biopsy with tissue marking for preoperative prediction of lesion sites and clinicopathological features of patients. We evaluated 93 patients who underwent 12-core prostate biopsy and subsequent radical prostatectomy. We correlated the biopsy results to the prostate sites in which biopsies were performed and prognostic factors of the patients, especially the degree of extraprostatic extension (EPE) obtained in surgical specimens. Among 253 cancer foci detected in 93 prostatectomy specimens, 168 (66.4%) foci were detected by biopsy. All patients had proven cancer. EPE-positive cancers were associated with a larger number of positive cores, larger tumor length, and higher percentage of cancer tissue in the corresponding cores. Systematic 12-core prostate biopsy with tissue marking is useful for preoperative detection of cancer foci and provides valuable information that enables effective surgical strategies.
    No preview · Article · May 2015 · The Tohoku Journal of Experimental Medicine
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    ABSTRACT: To understand the current practice pattern of active surveillance using a nationwide survey among Japanese urologists. A new questionnaire about active surveillance was developed and mailed to 863 training institutes in January 2014. The questionnaire included indications for active surveillance, percentage of active surveillance for localized prostate cancer, problems with active surveillance, which protocol was used, timing of first repeat biopsy, use of prostate-specific antigen or doubling time and use of magnetic resonance imaging. A total of 2133 Japanese urologists in the 632 training institutes answered the questionnaire. The median age was 42 years (26-84 years). Of the responders, 26.9% had no use of active surveillance for localized prostate cancer. The Prostate Cancer Research International: Active Surveillance criteria were most frequently used (29.7%), followed by a low-risk group without a definitive follow-up protocol (29.4%). Regarding repeat biopsy, 40.6% carried it out at 1 year after active surveillance initiation, but 24.1% did not usually carry it out and 31.8% carried it out only when they considered it necessary. Magnetic resonance imaging was used routinely in 22.2% and as required in 67.6%. Re-biopsy or magnetic resonance imaging was less carried out in general hospitals than in universities. The percentage of no usual repeat biopsy was significantly higher in urologists who had more than 10 years of experience. Repeat biopsies (60.3%), inadequate inclusion criteria (49.9%), psychological burden for patients (43.7%), unexpected progression (41.1%) and unknown long-term outcomes (40.6%) were considered the major problems of active surveillance in the responders. The practice pattern of active surveillance varies widely among Japanese urologists. It is necessary to gain a correct understanding of active surveillance. © 2015 The Japanese Urological Association.
    Preview · Article · May 2015 · International Journal of Urology
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    ABSTRACT: Direct injection of an anticancer agent into a metastatic lymph node (LN) has not been used as a standard treatment because evidence concerning the efficacy of local administration of a drug into a metastatic LN has not been established. Here we show that the combination of intralymphatic drug delivery with nano/microbubbles (NMBs) and ultrasound has the potential to improve the chemotherapeutic effect. We delivered cis-diamminedichloroplatinum (II) (CDDP) into breast carcinoma cells in vitro and found that apoptotic processes were involved in the antitumor action. Next, we investigated the antitumor effect of intralymphatic chemotherapy with NMBs and ultrasound in an experimental model of LN metastasis using MXH10/Mo-lpr/lpr mice exhibiting lymphadenopathy. The combination of intralymphatic chemotherapy with NMBs and ultrasound has the potential to improve the delivery of CDDP into target LNs without damage to the surrounding normal tissues. The present study indicates that intralymphatic drug delivery with NMBs and ultrasound will potentially be of great benefit in the clinical setting.
    Full-text · Article · Apr 2015 · PLoS ONE
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    ABSTRACT: Treatment for ruptured renal angiomyolipoma in pregnancy requires immediate and appropriate decision-making based on the condition of the mother and fetus, and gestational age. A 37-year-old woman at 25 weeks of pregnancy presented with severe right flank pain. Computed tomography showed a ruptured right renal angiomyolipoma (8 cm in diameter). The maternal and fetal conditions were stable. Transcatheter arterial embolization was carried out electively 4 days after the rupture. Minimization of radiation exposure to the fetus was achieved by X-ray shielding for the fetus, low-dose-rate fluoroscopy, minimal angiography imaging and a color Doppler ultrasonography-guided procedure. Although threatened premature labor occurred because of post-embolization syndrome, the pregnancy was continued until cesarean section at 37 weeks of pregnancy. © 2015 The Japanese Urological Association.
    No preview · Article · Apr 2015 · International Journal of Urology
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    ABSTRACT: About one third of renal cell carcinoma (RCC) patients exhibit metastasis upon initial presentation. However, the molecular basis for RCC metastasis is not fully understood. A ganglioside, disialosyl globopentaosylceramide (DSGb5), was originally isolated from RCC tissue extracts, and its expression is correlated with RCC metastatic potential. DSGb5 is synthesized by GalNAc α2,6-sialyltransferase VI (ST6GalNAcVI) and is expressed on the surface of RCC cells. Importantly, DSGb5 binds to sialic acid-binding Ig-like lectin-7 (Siglec-7) expressed on natural killer (NK) cells, thereby inhibiting NK-cell cytotoxicity. However, the role of DSGb5 in RCC progression remains obscure. To address this issue, we used ACHN cells derived from malignant pleural effusion of a patient with metastatic RCC. Using the limiting dilution method, we isolated three independent clones with different DSGb5 expression levels. Comparison of these clones indicated that the cloned cells with high DSGb5 expression levels exhibited greater migration potential, compared to the clone with low DSGb5 expression levels. In contrast, DSGb5 expression levels exerted no significant effect on cell proliferation. We then established the ACHN-derived cell lines that stably expressed siRNA against ST6GalNAcVI mRNA or control siRNA. Importantly, the ST6GalNAcVI-knockdown cells expressed low levels of DSGb5. We thus demonstrated the significantly decreased migration potential of the ST6GalNAcVI-knockdown cells with low DSGb5 expression levels, compared to the control siRNA-transfected cells expressing high DSGb5 levels, but no significant difference in the cell proliferation. Thus, DSGb5 expression may ensure the migration of RCC cells. We propose that DSGb5 expressed on RCC cells may determine their metastatic capability.
    Preview · Article · Apr 2015 · The Tohoku Journal of Experimental Medicine
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    ABSTRACT: The pre-B lymphocyte protein 3 (VPREB3) is expressed during B-cell differentiation and in subsets of mature B-lymphocytes and is mainly found in bone marrow and lymphoid tissue germinative centers. So far, its function in B-cells remains to be clarified. The mRNA of VPREB3 was previously detected in aldosterone-producing adenomas (APA), however further information about this protein in human adrenocortical cells and tissues is currently unavailable. Therefore, in the present study we for the first time investigate the protein expression of VPREB3 in human adrenocortical tissues. In addition, we approach the previously suggested similarities in expression patterns of aldosterone-producing cells and Purkinje neurons. Immunohistochemical analysis of VPREB3 was performed in 13 non-pathological adrenals (NA), 6 adrenal glands with idiopathic hyperaldosteronism (IHA), 18 APA, 5 cortisol-producing adenomas (CPA) and 5 non-pathological human cerebellum specimens. The mRNA levels of VPREB3, steroidogenic-enzymes and other aldosterone biosynthesis markers were detected in 53 APA samples using real-time RT-PCR (qPCR) and compared to the clinical data of APA patients. In our results, the VPREB3 protein was diffusely detected in APA, partially or weakly detected in CPA, and immunolocalized in the zona glomerulosa of NA and IHA, as well as in the cytoplasm of cerebellar Purkinje cells. In APA, VPREB3 mRNA levels were significantly correlated to plasma aldosterone (P=0.026; R=0.30), KCNJ5 mutations (P=0.0061; mutated 34:19 wild-type), CYP11B2 (P<0.0001; R=0.65), Purkinje cell protein 4 (PCP4; P<0.0001; R=0.53) and voltage-dependent calcium channels CaV1.3 (P=0.023; R=0.31) and CaV3.2 (P=0.0019; R=0.42). Based on our data, we hypothesize a possible role for VPREB3 in aldosterone biosynthesis, and present ideas for future functional studies.
    Full-text · Article · Apr 2015 · Endocrine Pathology
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    Full-text · Article · Apr 2015 · The Journal of Urology
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    Preview · Article · Apr 2015 · The Journal of Urology

Publication Stats

6k Citations
1,305.93 Total Impact Points


  • 2003-2016
    • Tohoku University
      • Department of Urology
      Sendai-shi, Miyagi, Japan
  • 2014
    • Hirosaki University
      Khirosaki, Aomori, Japan
  • 2002-2014
    • Akita University
      Akita, Akita, Japan
  • 2009
    • Miyagi Cancer Center
      Сендай, Miyagi, Japan
  • 2008
    • Toho University
      Edo, Tokyo, Japan
  • 1995-2007
    • Kurashiki Central Hospital
      Kurasiki, Okayama, Japan
  • 2003-2004
    • Sendai University
      Sendai, Kagoshima, Japan
  • 1989-1999
    • Kyoto University
      • Department of Urology
      Kioto, Kyōto, Japan