Kenji Yamazaki

Gifu University Hospital, Gihu, Gifu, Japan

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Publications (4)16.47 Total impact

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    ABSTRACT: A 68-year-old man complaining of back pain was given the diagnosis of mucinous adenocarcinoma of the sigmoid colon with disseminated carcinomatosis of bone marrow and disseminated intravascular coagulation(DIC). We started chemotherapy using FOLFOX4. After we confirmed that DIC had improved following 2 courses of FOLFOX4, bevacizumab was added to FOLFOX4. Laboratory studies revealed a serum CEA level of 11, 432 ng/mL, which improved to 245 ng/mL after a total of 9 courses of chemotherapy. Chemotherapy is continuing as scheduled at 6 months from the onset of this disease.
    Gan to kagaku ryoho. Cancer & chemotherapy 08/2013; 40(8):1105-9.
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    ABSTRACT: A small amount of free air, visible on CT but not on plain chest radiography, which appeared following endoscopic submucosal dissection (ESD) of a gastric neoplasm without endoscopically visible perforation, was defined as a "transmural air leak", and a prospective, consecutive entry study was performed to determine its incidence and clinical significance. Between January 2006 and September 2008, ESD was performed for 246 gastric lesions in 246 consecutive patients. Abdominal CT scan was performed 1 day after ESD. In addition, chest radiography and blood biochemistry tests were performed at different time points before and after ESD. Two hundred and nineteen lesions (89 %) were curatively removed by ESD. Among the total of 246 patients, we encountered endoscopically visible perforation during ESD in 2 patients (0.8 %), and clinically suspected perforation diagnosed by the presence of free air on chest radiography but invisible during ESD in 3 patients (1 %), while transmural air leak was observed in another 33 (13 %). Air leak occurred in cases where resection size was larger, procedure time longer, and the muscularis propria on the ulcer base was exposed at the end of ESD. Patients with air leaks developed pyrexia at a higher rate than those without (36 % vs. 16 %, P = 0.018). These patients recovered with antibiotics and required no endoscopic or surgical intervention. The presence of an air leak did not affect the duration of hospital stay. A transmural air leak was observed in 13 % of the patients undergoing ESD. Larger resection size, prolonged procedure time, and exposure of the muscularis propria on the ulcer base were risk factors for transmural air leak, but the outcome of patients with this complication was good.
    Endoscopy 06/2010; 42(6):441-7. · 5.74 Impact Factor
  • Gastrointestinal Endoscopy - GASTROINTEST ENDOSCOP. 01/2009; 69(5).
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    ABSTRACT: The activation of the peroxisome proliferator-activated receptor gamma (PPAR gamma) that forms heterodimers with retinoid X receptors (RXRs) elicits an antineoplastic effect on colorectal cancer. It was previously reported that the accumulation of the non-functional phosphorylated form of RXR alpha (p-RXR alpha) interfered with its signalling and promoted the growth of hepatoma cells. In this study the effects of p-RXR alpha on the ability of RXR alpha and PPAR gamma ligands to inhibit growth in colon cancer cells was examined. The effects of the combination of the PPAR gamma ligand ciglitazone and the RXR alpha lignad 9-cis-retinoic acid (RA) on inhibition of cell growth in Caco2 human colon cancer cells which express high levels of p-RXR alpha protein were examined. The RXR alpha protein was phospholylated and also accumulated in human colon cancer tissue samples as well as human colon cancer cell lines. When the phosphorylation of RXR alpha was inhibited by the MEK inhibitor PD98059 or by transfection with a point-mutated RXR alpha, which mimicked the unphosphorylated form, the combination of 9-cisRA and ciglitazone synergistically inhibited the cell growth and induced apoptosis. The combined treatment with these agents also caused a decrease in the expression levels of both cyclo-oxygenase-2 (COX-2) and c-Jun proteins and mRNAs. Reporter assays indicated that this combination induced the transcriptional activity of the peroxisome proliferator-responsive element promoter and also inhibited that of the AP-1 promoter. A malfunction of RXR alpha due to phosphorylation is associated with colorectal cancer. Therefore, the inhibition of phosphorylation of RX R alpha and the activation of the RXR-PPAR gamma heterodimer by their respective ligands may be useful in the chemoprevention and/or treatment of colorectal cancer.
    Gut 12/2007; 56(11):1557-63. · 10.73 Impact Factor