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Articles by H Yoshikawa
Total Records ( 4 ) for H Yoshikawa
  T Onda , H Yoshikawa , T Yasugi , K Matsumoto and Y. Taketani
  Objective

The optimal goal of interval debulking surgery (IDS) following neoadjuvant chemotherapy (NAC) remains undefined. The aim of this study was to determine the optimal goal of IDS following NAC on the basis of long-term survival by the disease status at the end of interval look surgery (ILS) or IDS during the treatment in the setting of upfront primary debulking surgery (PDS).

Methods

From January 1986 through December 2000, we performed treatment in the setting of upfront PDS in 128 patients with Stage III/IV epithelial ovarian cancer. Sixty-six patients with residual disease (RD) at PDS underwent interval surgery (IS) such as ILS or IDS; 4 patients after two cycles of chemotherapy and 62 after three or more cycles. We investigated how disease status at the end of IS was associated with overall survival (OS).

Results

The 5-year OS rates for no, minimal and gross RD were not available (n = 0), 67% (n = 3) and 0% (n = 1) after two cycles, and 47% (n = 42), 0% (n = 18) and 0% (n = 2) after three or more cycles, respectively. No visible tumors at the end of IS after three or more cycles of chemotherapy were necessary for 5-year survival.

Conclusions

If the optimal goal of IDS is defined as the surgery that is expected to result in long-term survival in the NAC setting treatment, our data on the assessment of peritoneal findings during the upfront PDS setting treatment suggest that only complete resection with no RD could be the optimal goal of IDS in the NAC setting treatment.

  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.

  D Morimoto , S Kuroda , T Kizawa , K Nomura , C Higuchi , H Yoshikawa and T. Tomita
 

Objective. To evaluate the osteoblastic differentiation of human mesenchymal stem cells (hMSCs) in patients with RA.

Methods. Heparinized bone marrow aspirate was obtained from patients with OA and RA. Mononuclear cells were cultured for 2 weeks and a colony-forming assay was performed. The phenotype of cells was analysed by flow cytometry. Passage 2 cells were cultured with β-glycerophosphate (bGP) in the control group and bGP, ascorbic acid and dexamethasone in the differentiation group. After 2 weeks, ALP staining and activity were performed. After 3 weeks, Alizarin Red S assay was performed. Total RNA was extracted from cells cultured for 2 and 3 weeks. Gene expression of bone formation factor was examined by real-time PCR.

Results. The phenotype of cells was identical in both OA and RA and the content was thought to be hMSCs. The results of ALP activity and Alizarin Red S assay showed higher levels in the differentiation group for both OA and RA samples compared with the control group. The results of a colony-forming assay were identical in both OA and RA samples. Gene expression in the differentiation group was higher than in the control group in both OA and RA samples. There was no significant difference between OA and RA samples in all experiments.

Conclusion. The function of osteoblastic differentiation of hMSCs is similar between OA and RA.

  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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