H. Kanayama

The University of Tokushima, Tokusima, Tokushima, Japan

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Publications (69)199.69 Total impact


  • No preview · Article · Apr 2015 · European Urology Supplements
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    ABSTRACT: Docetaxel is recommended as the first-line chemotherapy in patients with castration-refractory prostate cancer. Usually, 10 cycles of docetaxel is administered, however, the efficacy and the safety with more than 10 cycles of docetaxel have not been fully reported. We report on 2 patients who received at least 70 cycles of docetaxel including the combination therapy and survived more than 6 years. Considering the possible survival benefit of the long-term administration of docetaxel in selected patients, the timing to switch from docetaxel to the new drugs such as abiraterone acetate, enzalutamide, and cabazitaxel might be more complex.
    No preview · Article · Jan 2015 · Clinical Genitourinary Cancer
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    ABSTRACT: In an open-label, multicenter phase II study in Japanese patients with cytokine-refractory metastatic renal cell carcinoma, axitinib showed substantial antitumor activity with an acceptable safety profile. Here, we report overall survival and updated efficacy and safety results. Sixty-four Japanese patients with metastatic renal cell carcinoma following prior therapy with cytokines were treated with axitinib at a starting 5-mg twice-daily dose. Following median treatment duration of 14.2 months, median overall survival was 37.3 months (95% CI, 28.6-49.9). Objective response rate, the primary endpoint of the study, was 51.6% (95% CI, 38.7-64.2); median duration of response, 11.1 months (95% CI, 8.2-13.7); and median progression-free survival was 11.0 months (95% CI, 9.2-12.0), assessed by the independent review committee. Common treatment-related all-grade adverse events were hypertension (88%), hand-foot syndrome (75%), diarrhea (66%), proteinuria (63%), fatigue (55%), and dysphonia (53%). In an exploratory analysis, median overall survival was significantly longer in patients who had greater decreases in plasma levels of soluble vascular endothelial growth factor receptor-2 during the first cycle of treatment. In conclusion, this study showed axitinib to be effective, and, toxicities with long-term treatment were generally controllable with axitinib dose modification and/or standard medications in these Japanese patients. Some frequently reported adverse events warrant close monitoring and management. Changes in the plasma levels of soluble vascular endothelial growth factor receptor-2 may be used as a prognostic factor for overall survival in metastatic renal cell carcinoma following axitinib treatment. This study is registered at ClinicalTrial. gov (identifier NCT00569946).This article is protected by copyright. All rights reserved.
    Full-text · Article · Oct 2014 · Cancer Science
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    ABSTRACT: Background and purpose: The Japanese Urological Association and Japanese Society of Endourology established a urologic laparoscopic skills qualification system called the Endoscopic Surgical Skill Qualification (ESSQ) System in Urological Laparoscopy in 2004. The reliability of video assessments by referees was evaluated. Materials and methods: Videos of nephrectomies or adrenalectomies performed by the applicants were assessed by two referees selected among a pool of 42 referees. From 2004 to 2011, 1308 urologists applied and 60.2% were qualified after video assessments. The results of skills assessments on 1220 videos that had fixed points by two referees were analyzed statistically. Results: The average number of videos that each referee assessed was 58.1, with a range of 16 to 87. The accordance rate of the results of the video assessment, pass or fail, by the two referees was 68.9%. The scores of the video assessment by each referee averaged 62.7±2.4 (standard deviation) (full score was set at 75 points and ≥60 points was needed to pass). There was a statistically significant difference in the average video assessment score among the referees (P<0.001), and five referees showed significantly higher or lower average scores than the other referees. The percentage qualification of the final decision made by the Referee Committee on the videos originally assessed by each referee showed no significant differences among the 42 referees. The accordance rate of the results from the video assessment by each referee with the final decision by the committee showed a statistically significant positive correlation with the number of videos assessed by each referee (r=0.404, P=0.0080). Conclusions: The ESSQ system showed moderate reliability for the video assessments by the referees. It was concluded that the video assessments by the referees were fair for all applicants, because the final qualification rates showed no significant differences among the referees.
    No preview · Article · May 2014 · Journal of endourology / Endourological Society

  • No preview · Article · Apr 2014 · European Urology Supplements
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    ABSTRACT: Purpose: MicroRNAs (miRNA), single-stranded non-protein coding gene products, regulate gene expression through post-transcriptional inhibition, and known to be involved in essential biological processes including obesity and insulin resistance. miR-378 and miR-378*, which are encoded by PGC-1β gene and counterbalance the metabolic actions of PGC-1β. Mice genetically lacking miR-378 and miR-378* are resistant to high fat diet-induced obesity and exhibit enhanced mitochondrial fatty acid metabolism and elevated oxidative capacity of insulin-target tissues. We conducted to elucidate the role of miR378 expression in human adiposity and adipose tissue inflammation. Methods: Pair samples were obtained from subcutaneous (SAT) and visceral adipose tissue (VAT) during elective operation in 71 men and 42 women. Mature miRNA levels were determined by qRT-PCR and normalized to levels of U6 small nuclear ribonucleoprotein. Subcutaneous (SFA) and visceral fat area (VFA) was determined by abdominal multidetector CT scanning. Adipocyte sizing was determined by the osmium-fixed method on a Coulter counter. Results: Study 1 (clinical study): SFA were larger than VFA, and the mean size of adipocytes was greater in SAT than in VAT. In VAT, level of log(miR100) was positively correlated with level of adiponectin, TLR4 and HMGB1, while negatively correlated with CD68, NOX4 and with mean size of adipocyte. In SAT, level of log(miR100) was positively correlated with level of IL18, TLR4 and HMGB1, while negatively correlated with NOX4. Study 2 (in vitro study): expression levels of miR100 as well as PPARγ2 and PGC1α were increased in adipocyte-like 3T3L1 cells during differentiation. Levels of PPARγ2 and PGC1α were inhibited by antisense miRNA transfection. The expression levels of computer-predicted target genes, ACSL1, acyl-CoA synthetase long-chain family member 1 and AGPAT6, 1-acylglycerol-3-phosphate O-acyltransferase 6 (lysophosphatidic acid acyltransferase ζ), were partially inhibited by anti-sense miR-378 overexpression. Conclusion: Adipose tissue miR378 is derived mostly from adipocytes and may play a role in regulating expressions of adipocyte inflammatory cytokines and insulin sensitivity in human. Results suggested that mir-378 regulates adipocytokine expression by targeting transcriptional factors and controls adipose tissue inflammation in human.
    Preview · Article · Aug 2013 · European Heart Journal
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    ABSTRACT: Purpose: MicroRNAs (miRNA), single-stranded non-protein coding gene products, regulate gene expression through post-transcriptional inhibition, and known to be involved in essential biological processes including obesity and insulin resistance. This study was conducted to elucidate the role of miR100 expression in human adiposity and insulin resistance. Methods: Pair samples were obtained from subcutaneous (SAT) and visceral adipose tissue (VAT) during elective operation in 71 men and 42 women. Mature miRNA levels were determined by qRT-PCR and normalized to levels of U6 small nuclear ribonucleoprotein. Subcutaneous (SFA) and visceral fat area (VFA) was determined by abdominal multidetector CT scanning. Adipocyte sizing was determined by the osmium-fixed method on a Coulter counter. Results: Study 1 (clinical study): In men and women, SFA was larger than VFA, and the mean size of adipocytes was greater in SAT than in VAT. Level of log(miR100) was significantly decreased in VAT in men (p=0.025), but comparable between SAT and VAT in women. Level of log(miR100) in VAT was positively correlated with HOMA-IR, and tended to be positively correlated with expression level of macrophage marker, CD68. Level of log(miR100) in SAT was positively correlated with expression level of IL1β, NLRP3 and TLR4 in men but not in women. Study 2 (in vitro study): When stimulated with lipopolysaccharide (LPS, 1-10ng/mL), expression of miR100 was not changed in mouse macrophage-like Raw264.7 cells, but enhanced in adipocyte-like 3T3-L1 cells. A member of the NOX family of NADPH oxidases NOX4, which has a possible MiR100 target at 3'-UTR, was up-regulated in 3T3-L1 cells by LPS, but not changed in Raw264.7 cells. NOX2, another type of NADPH oxidase, was not detected in 3T3L1 cells but was in Raw264.7 cells. Conclusion: Adipose tissue miR100 is derived mostly from adipocytes and may play a direct or indirect role in regulating expressions of adipocyte inflammatory cytokines, adipocyte-specific NADPH oxidase, and insulin sensitivity in human.
    Preview · Article · Aug 2013 · European Heart Journal
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    ABSTRACT: We conducted this study to determine whether substitution with anti-androgen (SOA) and tegafur-uracil (a pro‑drug of 5-FU) combination therapy is more effective than SOA alone after relapse from initial hormonal therapy. Patients who were histologically confirmed and relapsed after initial hormonal therapy were included. All patients were randomly allocated into two groups: SOA alone (group A) or SOA combined with tegafur-uracil (group B). The mRNA expression of four enzymes, including thymidylate synthase (TS), dihydropyrimidine dehydrogenase (DPD), orotate phospho-ribosyltransferase (OPRT) and thymidine phosphorylase (TP), in prostate cancer cells was analyzed by quantitative reverse-transcription polymerase chain reaction. Fifty-two patients were enrolled in this study. The median age was 77 (range: 47-92) years. The PSA response rate in group B (61.5%) tended to be higher compared to that in group A (34.6%) (p=0.095). Group B (median: 15.9 months) had a significantly longer time to PSA progression (TTP) compared to group A (6.4 months) (p=0.014). In patients with a lower TS expression or a higher OPRT expression, group B demonstrated a higher PSA response rate compared to group A (p=0.019 and p=0.041, respectively). In addition, in the patients with a lower TS expression, group B demonstrated a significantly longer TTP compared to group A (p=0.018). There were no severe adverse events in either treatment group. After relapse from initial hormonal therapy, SOA combined with tegafur-uracil is effective and well tolerated. The TS mRNA expression level may be a predictive factor for this combination therapy.
    Preview · Article · Jun 2013 · International Journal of Oncology
  • H. Izaki · H. Kanayama
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    ABSTRACT: Since laparoscopic surgery for malignant adrenal tumor, urinary incontinence and bladder cancer became newly covered by medical insurance in April 2012, almost all operations within the field of urology can now be carried out via laparoscopy. Furthermore, robot-assisted laparoscopic radical prostatectomy (RALP) is also now covered by medical insurance. These changes will make the adaptation of laparoscopic surgery evolve rapidly. In this review, from the viewpoint of adaptation and the evolution of adaptation for each disease and the influence of locality, we describe the future outlook of laparoscopic surgery within the field of urology.
    No preview · Article · Jun 2013 · Nishinihon Journal of Urology
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    ABSTRACT: Objective Axitinib is a potent and selective second-generation inhibitor of vascular endothelial growth factor receptors 1, 2 and 3. The efficacy and safety of axitinib in Japanese patients with metastatic renal cell carcinoma were evaluated. Methods A subgroup analysis was conducted in Japanese patients enrolled in the randomized Phase III trial of axitinib versus sorafenib after failure of one prior systemic therapy for metastatic renal cell carcinoma. Results Twenty-five (of 361) and 29 (of 362) patients randomized to the axitinib and sorafenib arms, respectively, were Japanese and included in this analysis. Median progression-free survival in Japanese patients was 12.1 months (95% confidence interval 8.6 to not estimable) for axitinib and 4.9 months (95% confidence interval 2.8–6.6) for sorafenib (hazard ratio 0.390; 95% confidence interval 0.130–1.173; stratified one-sided P = 0.0401). The objective response rate was 52.0% for axitinib and 3.4% for sorafenib (P = 0.0001). The common all-causality adverse events (all grades) in Japanese patients were dysphonia (68%), hypertension (64%), hand–foot syndrome (64%) and diarrhea (56%) for axitinib, and hand–foot syndrome (86%), hypertension (62%) and diarrhea (52%) for sorafenib. The safety profiles of axitinib and sorafenib in Japanese patients were generally similar to those observed in the overall population, with the exceptions of higher incidences of hypertension, dysphonia, hand–foot syndrome, hypothyroidism and stomatitis. Conclusions Axitinib is efficacious and well tolerated in Japanese patients with previously treated metastatic renal cell carcinoma, consistent with the results in the overall population, providing a new targeted therapy for these Japanese patients.
    Full-text · Article · Apr 2013 · Japanese Journal of Clinical Oncology
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    ABSTRACT: Studies of renal cell carcinoma (RCC) have led to the development of new molecular-targeted drugs but its oncogenic origins remain poorly understood. Here we report the identification and critical roles in renal carcinogenesis for DDX31, a novel nucleolar protein upregulated in the vast majority of human RCC. Immunohistochemical overexpression of DDX31 was an independent prognostic factor for RCC patients. RNAi-mediated attenuation of DDX31 in RCC cells significantly suppressed outgrowth, whereas ectopic DDX31 overexpression in human 293 kidney cells drove their proliferation. Endogenous DDX31 interacted and colocalized with nucleophosmin (NPM1) in the nucleoli of RCC cells, and attenuation of DDX31 or NPM1 expression decreased pre-ribosomal RNA biogenesis. Notably, in DDX31-attenuated cells, NPM1 was translocated from nucleoli to the nucleoplasm or cytoplasm where it bound to HDM2. As a result, HDM2 binding to p53 was reduced, causing p53 stablization with concomitant G1 phase cell cycle arrest and apoptosis. Taken together, our findings define a mechanism through which control of the DDX31-NPM1 complex is likely to play critical roles in renal carcinogenesis.
    Preview · Article · Sep 2012 · Cancer Research
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    ABSTRACT: The aims of the present study were to: (i) develop a clinically useful prognostic classification in Asian patients with metastatic renal cell carcinoma (RCC) by combining metastatic features with several pretreatment parameters; and (ii) evaluate the validity of this prognostic classification. Baseline characteristics and outcomes were collected for 361 patients who underwent interferon-α-based therapy between 1995 and 2005. Relationships between overall survival (OS) and potential prognostic factors were assessed using Cox's proportional hazard model. The predictive performance of the model was evaluated using bootstrap resampling procedures and by using an independent dataset obtained from randomly selected institutions. The predictive accuracy was measured using the concordance index (c-index). Four factors were identified as independent prognostic factors: time from initial diagnosis to treatment, anemia, elevated lactate dehydrogenase (LDH), and poor prognostic metastatic group (liver only, bone only, or multiple organ metastases). Each patient was assigned to one of three risk groups: favorable risk (none or one factor; n = 120), in which median OS was 51 months; intermediate risk (two factors; n = 101), in which median OS was 21 months; and poor risk (three or four factors; n = 102), in which median OS was 10 months. The c-index was 0.72 in the original dataset and 0.72 in 500 random bootstrap samples. In the independent dataset for external validation, the c-index was 0.73. Thus, the new prognostic classification is easily applicable for Asian patients with previously untreated metastatic RCC and should be incorporated into patient care, as well as clinical trials performed in Asia.
    Full-text · Article · May 2012 · Cancer Science
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    ABSTRACT: In 2003, the Japanese Urological Association (JUA) and Japanese Society of Endourology (JSE) established a urological laparoscopic skill qualification system, called the Endoscopic Surgical Skill Qualification System in Urological Laparoscopy of JUA and JSE (ESSQSJJ). The main goal of the system is to decrease the prevalence of complications associated with laparoscopic surgery. To validate the qualification system, perioperative outcome and the prevalence of complications in different types of urological laparoscopic surgery performed by accredited surgeons were evaluated. One hundred thirty-six surgeons who obtained the qualification in 2004 were prospectively asked to submit intraoperative and postoperative data of their latest 20 cases at the end of 2009, along with the number of laparoscopic urological surgeries performed in each year for a 5-year period (2004-2009). Intraoperative and postoperative complications were graded according to the Satava classification and modified Clavien classification, respectively. Data of 2,590 urological laparoscopic surgeries of 130 surgeons, including 904 laparoscopic radical nephrectomies, 430 laparoscopic nephroureterectomies, 390 laparoscopic adrenalectomies, 320 laparoscopic radical prostatectomies, and 170 laparoscopic partial nephrectomies, were analyzed. Complications were noted in 97 (3.7%) patients. Major intraoperative complications (grade II or III) occurred in 32 (1.2%) patients, and major postoperative complications (grade III or higher) occurred in 24 (0.9%) patients. The prevalence of conversion to open surgery, allogeneic transfusion, and perioperative mortality was 2.5%, 1.6%, and 0%, respectively. The number of surgeries performed by each qualified surgeon or the role of the surgeon (main operator vs. mentor/instructor) in the surgery did not affect the prevalence of intraoperative complications or postoperative complications. The open conversion rate was significantly higher in surgeons with a low surgical volume. ESSQSJJ can ensure urological laparoscopic surgeons who can perform various types of urological laparoscopic surgeries with a low prevalence of perioperative complications and reasonable outcomes.
    No preview · Article · Dec 2011 · Surgical Endoscopy
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    ABSTRACT: To examine plakophilin proteins (Pkp) and 3 expression levels in bladder cancer, in particular their levels during cellular growth and invasion. Pkp is associated with the binding of cadherin to intermediate filaments of the cytoskeleton. The relative mRNA and protein expression levels of Pkp2 and 3 in bladder cancer cell lines were determined using quantitative real-time polymerase chain reaction and Western blot analyses. The cellular localization of Pkp2 and 3 proteins in bladder cancer cells was also assayed using immunohistochemistry. The proliferation and invasive activities of bladder cancer cells were evaluated using cell growth and in vitro cell invasion assays, and were compared with those of bladder cancer cells treated with Pkp2 and 3 small interfering RNAs. Pkp2 mRNA and protein levels were elevated, and those of Pkp3 were reduced, in bladder cancer cells that are known to exhibit increased proliferation and invasive activity. Pkp2/3 protein expression was predominantly observed in the cytoplasm of invasive bladder cancer cells and tissues. Pkp2 knockdown inhibited, and Pkp3 knockdown enhanced, invasion of bladder cancer cells, but these knockdowns did not alter cell proliferation. We conclude that high Pkp2, and low Pkp3, expression is associated with bladder cancer cell invasion and that neither Pkp2 nor Pkp3 is associated with cell proliferation. We further hypothesize that accumulation of Pkp2 and 3 in the cell cytoplasm, rather than their recruitment to the cell membrane, is related to an increased ability of the tumor to invade and metastasize.
    No preview · Article · Nov 2011 · Urology
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    ABSTRACT: We herein report a case of Reiter syndrome. A 62-year-old man was treated for transitional cell carcinoma (pTl, G3) by intravesical Bacille Calmette-Guerin therapy (immunobladder intravesical instillation 40 mg). After the 4th instillation, bilateral conjunctivitis was noted. After treatment with eye drops for one week, the condition recovered. However, after the 5th instillation, he suffered from multiple arthritis, miction pain and high fever. Under the diagnosis of Reiter syndrome, a nonsteroidal anti-inflammatory drug and corticosteroid were administered and the symptoms improved. It is important for the early diagnosis and treatment of Reiter syndrome to carefully check for complications following intravesical instillation of BCG.
    No preview · Article · Oct 2011 · Nishinihon Journal of Urology

  • No preview · Article · Sep 2011 · Urology

  • No preview · Article · Sep 2011 · Urology

  • No preview · Article · Sep 2011 · Urology

  • No preview · Article · Sep 2011 · Urology

  • No preview · Article · Sep 2011 · Urology

Publication Stats

785 Citations
199.69 Total Impact Points

Institutions

  • 1994-2015
    • The University of Tokushima
      • • Department of Urology
      • • Department of Clinical Nutrition
      Tokusima, Tokushima, Japan
  • 2007
    • Tokyo Dental College
      Edo, Tōkyō, Japan
    • Kyoto University
      • Department of Urology
      Kioto, Kyōto, Japan