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Articles by T Shibata
Total Records ( 8 ) for T Shibata
  N Katsumata , T Watanabe , H Minami , K Aogi , T Tabei , M Sano , N Masuda , J Andoh , T Ikeda , T Shibata and S. Takashima
 

Background: This randomized, multicenter, phase III trial compared doxorubicin plus cyclophosphamide (AC), single-agent docetaxel (D), and an alternating regimen of AC and docetaxel (AC–D) as first-line chemotherapy in metastatic breast cancer (MBC).

Patients and methods: Patients with MBC resistant to endocrine therapy were entered in a randomized study to receive either six cycles of AC (doxorubicin 40 mg/m2 plus cyclophosphamide 500 mg/m2), D (60 mg/m2), or alternating treatment with AC–D (i.e. three cycles of AC and three cycles of D). Treatment was administered every 3 weeks.

Results: A total of 441 patients were entered in a randomized study. Response rates were 30% for AC, 41% for D, and 35% for AC–D. The median times to treatment failure (TTFs) were 6.4, 6.4, and 6.7 months (one-sided log-rank test, P = 0.13 for AC versus D, P = 0.14 for AC versus AC–D) and median overall survival (OS) was 22.6, 25.7, and 25.0 months (P = 0.09 for AC versus D, P = 0.13 for AC versus AC–D) in the AC, D, and AC–D, respectively.

Conclusion: There was no difference in the TTF among the three arms. However, there was a trend toward a better response and better OS in the D than in the AC.

  I Saito , R Kitagawa , H Fukuda , T Shibata , N Katsumata , I Konishi , H Yoshikawa and T. Kamura
 

A randomized controlled trial has been started in Japan to compare the utility of palliative chemotherapy containing paclitaxel and carboplatin (TC) with paclitaxel and cisplatin (TP) as a standard treatment for patients with the newly diagnosed Stage IVB, persistent or recurrent cervical cancer who are not amenable to curative treatment with local therapy. This trial was designed to evaluate the non-inferiority of TC as measured by the number of hospitalized days as an indicator of quality of life (QOL) when compared with TP combination therapy. The primary endpoint is overall survival. Secondary endpoints are progression-free survival, response rates, adverse events, severe adverse events and the proportion of non-hospitalization periods compared with planned treatment periods.

  K Nakamura , H Saji , R Nakajima , M Okada , H Asamura , T Shibata , S Nakamura , H Tada and M. Tsuboi
 

A Phase III study was started in Japan to evaluate the non-inferiority in overall survival of segmentectomy compared with lobectomy in patients with small-sized (diameter ≤2 cm) peripheral non-small cell lung cancer, excluding radiologically determined non-invasive cancer. This study began in August 2009, and a total of 1100 patients will be accrued from 71 institutions within 3 years. The primary endpoint is overall survival. The secondary endpoints are post-operative respiratory function, relapse-free survival, proportion of local recurrence, adverse events, proportion of patients who complete segmentectomy, duration of hospitalization, duration of chest tube placement, operation time, blood loss and number of auto-sutures used. This study is one of the first intergroup studies in Japan between the Japan Clinical Oncology Group and the West Japan Oncology Group.

  K Shitara , T Yokota , D Takahari , T Shibata , T Ura , Y Komatsu , S Yuki , M Yoshida , H Takiuchi , S Utsunomiya , Y Yatabe and K. Muro
 

Standard weekly cetuximab and irinotecan is an effective regimen in heavily pre-treated patients with metastatic colorectal cancer. The aim of this study is to prospectively evaluate the efficacy of combination chemotherapy with biweekly cetuximab and irinotecan in patients with pre-treated metastatic colorectal cancer harboring wild-type KRAS. A total of 30 patients will be enrolled at four medical institutions. The primary endpoint is response rate. The secondary endpoints include adverse events, progression-free survival and overall survival. The pharmacokinetics of cetuximab will also be evaluated in five patients.

  M Okubo , Y Nishimura , T Shibata , K Nakamatsu , S Kanamori , I Tachibana , R Koike , T Nishikawa and K. Mori
  Objective

The purpose of this retrospective study was to analyze the results of accelerated hyperfractionation for patients with modeletaly advanced (T2 and T3) laryngeal cancer.

Methods

Between 1998 and 2007, 9 supraglottic carcinomas (6 T2N0M0, 2 T2N2M0, 1 T3N0M0), 30 glottic carcinomas (25 T2N0M0, 5 T3N0M0), and 1 T2N0M0 subglottic carcinoma were treated with definitive radiotherapy using accelerated hyperfractionation without concurrent chemotherapy. The dose-fractionation for 35 patients was 72.8 Gy/56 fractions/5.6 weeks, and that for four patients treated between 1998 and 2001 was 72 Gy/60 fractions/6 weeks. One patient who had been treated with steroid therapy for systemic lupus erythematosus was treated by 67.8 Gy/44 fractions/4.4 weeks.

Results

The local control and overall survival probabilities at 5 years for supraglottic carcinomas were 75% and 86%, respectively. Those for glottic carcinomas were 80% and 92%, respectively. The 5-year local control probabilities for T2 and T3 tumors were 85% and 56%, respectively. This excellent local control rate especially for T2 laryngeal carcinomas may be attributable to the effect of accelerated hyperfractionation. No late toxicities of grade 2 or more was noted among the 39 patients treated with 72.8 Gy/56 fractions or 72 Gy/60 fractions.

Conclusion

Accelerated hyperfractionation of 72.8 Gy/56 fractions/5.6 weeks using 1.3 Gy/fraction seems a safe and effective dose-fractionation for patients with moderately advanced laryngeal carcinomas.

  K Matsumoto , H Honda , T Shibata , D Sanada , Y Wada , E Ashikaga , A Kuroki , K Kitazawa and T. Akizawa
 

An elderly woman presented with haematuria and proteinuria accompanied by elevated serum myeloperoxidase (MPO)-specific anti-neutrophil cytoplasmic antibodies (MPO-ANCA). A renal biopsy revealed mild mesangial proliferation with fibrocellular crescent formation and a membranous glomerular lesion. Immunofluorescence microscopy using FITC-labelled rabbit anti-human MPO antibodies revealed granular MPO deposition along the glomerular capillary walls (GCW) with a staining profile similar to that of glomerular IgG deposition. The one-year follow-up renal biopsy revealed minimal IgG and undetectable MPO deposition. Both MPO and MPO-ANCA might have been responsible for the IgG immune depositions along the GCW in this patient.

  T Shibata , S Nagao , H Tai , S Nagatomo , H Hamada , H Yoshikawa , A Suzuki and Y. Yamamoto
 

Human adult haemoglobin (Hb A), a tetrameric oxygen transfer haemoprotein, has been recognized as an excellent model for investigating the structure–function relationships in allosteric proteins, and has been characterized exhaustively from both experimental and theoretical aspects. Despite the detailed structural and spectroscopic information available for the protein, functional properties have not been as fully elucidated as expected, and hence have remained unexplored. A major drawback for the functional characterization of Hb A is the lack of experimental techniques which enable quantitative characterization of functional properties of the individual subunits of the intact protein. In this study, we have developed techniques for determining the equilibrium constant of the acid–alkaline transition, usually represented as the ‘pKa’ value, in the individual subunits of the met-forms of Hb A (metHb A) and human foetal haemoglobin (metHb F). The pKa values of the individual subunits of metHb A and metHb F have been shown to constitute novel and highly sensitive probes for characterizing the effects of structural changes of not only the interfaces between the subunits within the protein, but also the contact between haem and the protein in the haem pocket. In addition, haem replacement studies of the proteins revealed that the contact between the haem peripheral vinyl side chain and the protein in the haem pocket is important for maintaining the non-equivalence in the haem environment between the subunits of Hb A and Hb F, which could be relevant to the cooperative ligand binding of the proteins.

 
 
 
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