Masato Suzuki

Teikyo University, Edo, Tōkyō, Japan

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Publications (47)73.85 Total impact

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    ABSTRACT: Serotonin (5-hydroxytryptamine [5-HT])3 receptor antagonists are effective for the treatment of diarrhea-predominant irritable bowel syndrome (IBS-D), in which exaggerated intestinal/colonic hypermotility is often observed. Recent studies have suggested that the motility disorder, especially spastic hypermotility, seen in the neorectum following sphincter-preserving operations for rectal cancer may be the basis of the postoperative defecatory malfunction seen in these patients. We investigated the efficacy of 5-HT3 receptor antagonists in patients suffering from severe low anterior resection syndrome. A total of 25 male patients with complaints of uncontrollable urgency or fecal incontinence following sphincter-preserving operations were enrolled in this study. Defecatory status, assessed on the basis of incontinence score (0-20), urgency grade (0-3), and number of toilet visits per day, was evaluated using a questionnaire before and 1 month after the administration of the 5-HT3 antagonist ramosetron. All the parameters assessed improved significantly after taking ramosetron for 1 month. The effect was more prominent in cases whose anastomotic line was lower, ie, inside the anal canal. Defecatory function was better in patients who commenced ramosetron therapy within 6 months postoperatively, as compared to those who were not prescribed ramosetron for more than 7 months postoperatively. These results suggest that 5-HT3 antagonists are effective for the treatment of low anterior resection syndrome, as in diarrhea-predominant irritable bowel syndrome. The improvement in symptoms is not merely time dependent, but it is related to treatment with 5-HT3 antagonists.
    Full-text · Article · Mar 2014 · Clinical and Experimental Gastroenterology
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    Preview · Article · Jan 2014 · Nihon Gekakei Rengo Gakkaishi (Journal of Japanese College of Surgeons)
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    ABSTRACT: Several essential oils possess pharmacological effects. Among the various constituents of essential oils, 1, 8-cineole has been shown to possess pharmacological effects such as anti-bacterial and anti-inflammatory effects. The effect of 1, 8-cineole on human colorectal cancer cells, however, has not reported previously. In this study, we have investigated the anti-proliferative effect of 1, 8-cineole on human colon cancer cell lines HCT116 and RKO by WST-8 and BrdU assays. The cytotoxicity of 1, 8-cineole was investigated by LDH activity and TUNEL staining. The mechanism of apoptosis by 1, 8-cineole was determined by western blot analyses. In in vivo study, RKO cells were injected into the SCID mice and the effect of 1, 8-cineole was investigated. Specific induction of apoptosis, not necrosis, was observed in human colon cancer cell lines HCT116 and RKO by 1, 8-cineole. The treatment with 1, 8-cineole was associated with inactivation of survivin and Akt and activation of p38. These molecules induced cleaved PARP and caspase-3, finally causing apoptosis. In xenotransplanted SCID mice, the 1, 8-cineole group showed significantly inhibited tumor progression compared to the control group. These results indicated 1, 8-cineole suppressed human colorectal cancer proliferation by inducing apoptosis. Based on these studies 1, 8-cineole would be an effective strategy to treat colorectal cancer.
    No preview · Article · Oct 2013 · Oncology Reports
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    ABSTRACT: Fatty acid synthase is highly expressed in many types of human cancers. Cerulenin, a natural inhibitor of fatty acid synthase, induced apoptosis in the human colon cancer cell lines HCT116 and RKO. Oxaliplatin also induced cell death in these cell lines. Cerulenin treatment was associated with reduced levels of phosphorylated Akt, activation of p38 and induced caspase-3 cleavage and finally caused apoptosis. Oxaliplatin induced activation of the p53-p21 pathway and p38. In combination with cerulenin and oxaliplatin, activation of the p53-p21 pathway and p38 occurred in a smaller concentration and finally induced caspase-3 cleavage in a smaller concentration of cerulenin and oxaliplatin. In xenotransplanted SCID mice, the cerulenin + oxaliplatin group significantly inhibited tumor progression compared to the control, cerulenin and oxaliplatin groups. Based on these studies, inhibiting fatty acid synthase would be an effective strategy to treat unresectable colorectal cancer tumors in combination with oxaliplatin. Fatty acid synthase inhibitor would be one of the best counterparts of oxaliplatin, which reduces the dose and side-effects of oxaliplatin and would make it possible to endure the chemotherapy over a longer period.
    Full-text · Article · Jun 2013 · International Journal of Oncology

  • No preview · Article · Jan 2013 · Nihon Gekakei Rengo Gakkaishi (Journal of Japanese College of Surgeons)
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    ABSTRACT: We evaluated the efficacy and safety of neoadjuvant chemotherapy using modified OPTIMOX1 plus bevacizumab for advanced rectal cancer. Nine cases with highly advanced rectal cancer for which curative surgery was potentially difficult were enrolled(clinical T4 in 7 cases, lateral node metastasis in 3 cases, M1 in 2 cases). The number of courses of modified OPTIMOX1(mFOLFOX6 and sLV5FU2, alternating administration)plus bevacizumab ranged from 1 to 21(median: 10). Surgical procedures consisted of internal sphincter resection(ISR)in 4 patients, ultra-low anterior resection(ULAR)in 2 patients, pelvic exenteration(TPE)in 2 patients, and Hartmann's procedure in 1 patient. Liver resection was conducted in 2 patients. RM1 was confirmed in 2 patients, but curative surgery was performed in the other patients. Histological efficacy of grade x/1a/1b/2were seen in the above 1/4/2/2 cases, respectively. Neurotoxicity associated with oxaliplatin was mild; no grade 3 neurotoxicity was noted. Recurrence has been confirmed in 5 patients at the median follow-up period of 650 days. It was suggested that modified OPTIMOX1 plus bevacizumab is effective and safe to administer as a neoadjuvant chemotherapy for curative resection or anus-preserving surgery in patients with highly advanced rectal cancer.
    No preview · Article · Jul 2012 · Gan to kagaku ryoho. Cancer & chemotherapy

  • No preview · Article · Dec 2011 · International Journal of Colorectal Disease

  • No preview · Article · Jan 2011 · Suizo
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    ABSTRACT: The objective of this study was to clarify the surgical outcome of patients with palliative surgery for malignant bowel obstruction. This study investigated the clinical features, operative procedures and postoperative course of 35 patients who underwent a palliative surgery for malignant bowel obstruction. And then the patients were divided into two groups; Patients in A group were consisted of 4 patients with hospital death and 7 patients with postoperative complications. Patients in B group were consisted of 24 patients without hospital death or postoperative complications. Eighteen patients who had been inserted nasogastric tube or ileus tube in the preoperative state could be removed. Thirty-three of 35 patients(94.3%)could become an oral ingestion. Four of 35 patients(11.4%)could not be discharged; 3 patients died of cancer and 1 patient died of acute myocardial infarction. Postoperative complications were seen in 7 patients except 4 patients with hospital death. The median postoperative stay was 18 days(3-58). Twenty six of 35 patients(74.3%) underwent chemotherapy. The median survival time was 137 days(3-1,614). The patients in A group showed a lower level of albumin(p=0.0071)and hemoglobin,(p=0.0006)and poorer performance status(p=0.0178)than the patients in B group. The median hospital stay of the patients in A group and B group were 28 days and 16 days, respectively(p=0.0823). The median survival time of the patients in A group and B group were 42 days and 119 days, respectively(p=0.0035). We concluded that the palliative surgery made an oral ingestion possible and improved a quality of life of the patients with malignant bowel obstruction. However, the surgical indication should be carefully decided for the patients with low albumin, hemoglobin and poor performance status.
    No preview · Article · Dec 2010 · Gan to kagaku ryoho. Cancer & chemotherapy
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    ABSTRACT: Incidental detection of pancreatic tumors has in recent years become more frequent owing to progress made in diagnostic imaging. We report a case of a preoperatively diagnosed intrapancreatic accessory spleen performed limited surgery for not being able to ruled out malignancy of cystic component. A 55-year-old woman with suspected appendicitis underwent computed tomography which detected a cystic lesion with a solid component 3cm in diameter at the pancreatic tail. We suspected the tumor to be an intrapancreatic accessory spleen because endoscopic ultrasonography showed identical image patterns for both the solid component of the tumor and spleen. Superparamagnetic iron oxide magnetic resonance imaging showed a decrease in signals, and 99mTc-Sn colloid scintigraphy indicated an uptake in both lesions. The patient was given a diagnosis of intrapancreatic accessory spleen, and informed that malignancy could not be ruled out completely upon which she requested surgery. The tumor at the pancreatic tail was soft, brownish, and 3cm in diameter, and spleen preserving pancreatic tail resection was performed confirming the diagnosis of intrapancreatic accessory spleen by intraoperative frozen section. The postoperative course was uneventful and she was discharged on postoperative day 16. To the best of our knowledge only 9 cases of preoperatively diagnosed intrapancreatic accessory spleen have been reported in the literature, and we therefore report this rare case.
    No preview · Article · May 2010 · Nippon Shokaki Geka Gakkai zasshi
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    ABSTRACT: We investigated the feasibility of new carbon dioxide-enhanced virtual multidetector computed tomography (MDCT) cholangiopancreatography (CMCP) for intraluminal exploration in 73 patients with hepatobiliary and pancreatic disease. CMCP was performed via a percutaneous or transpapillary drainage tube, and, synchronously, intravenous contrast material was employed for virtual angiography; three-dimensional (3D) virtual reality was incorporated using OsiriX and Fovia applications. The capability of carbon dioxide to delineate the biliary and pancreatic system was evaluated. All CMCPs showed complete technical success; complications including pancreatitis or pain never occurred. The incidences of visible third- and fourth-order biliary branches were 100 and 86.0%. The capability of carbon dioxide to pass an obstruction through an occluded hilar bile duct malignancy was 80.0%; it provided feasible information on additional bile duct segments. The full extent of the gallbladder was depicted in 72.7% of the studies. Minimum 2-mm lesions of biliary stones or gallbladder polyps were clearly detected. The main or second-order pancreatic ducts were visible in 100 and 83.3% of the studies, respectively. Carbon dioxide enabled the replacement of mucin and pancreatic juice and facilitated the detection of cystic lesions of intraductal papillary-mucinous neoplasm (IPMN) in 75.0% of the studies. We succeeded in achieving 3D spatial recognition of vascular structures in the cholangiopancreatic region, through the fusion of CMCP and 3DCT arteriography and venography in a single image scanning, and radiation time was decreased. This combined modality proved to be feasible for planning operations and for image-guided navigated surgery in the resection of a malignancy. To our knowledge, this is the first report to demonstrate the diagnostic accuracy of carbon dioxide MDCT cholangiopancreatography and the use of this modality for depicting biliary, pancreatic, and fusion blood vessels simultaneously. Carbon dioxide possesses many advantages over conventional iodinated contrast agents, and it might replace more invasive diagnostic measures in the near future.
    Preview · Article · Oct 2009 · Journal of Hepato-Biliary-Pancreatic Sciences
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    ABSTRACT: We applied a new concept of "image overlay surgery" consisting of the integration of virtual reality (VR) and augmented reality (AR) technology, in which dynamic 3D images were superimposed on the patient's actual body surface and evaluated as a reference for surgical navigation in gastrointestinal, hepatobiliary and pancreatic surgery. We carried out seven surgeries, including three cholecystectomies, two gastrectomies and two colectomies. A Macintosh and a DICOM workstation OsiriX were used in the operating room for image analysis. Raw data of the preoperative patient information obtained via MDCT were reconstructed to volume rendering and projected onto the patient's body surface during the surgeries. For accurate registration, OsiriX was first set to reproduce the patient body surface, and the positional coordinates of the umbilicus, left and right nipples, and the inguinal region were fixed as physiological markers on the body surface to reduce the positional error. The registration process was non-invasive and markerlesss, and was completed within 5 min. Image overlay navigation was helpful for 3D anatomical understanding of the surgical target in the gastrointestinal, hepatobiliary and pancreatic anatomies. The surgeon was able to minimize movement of the gaze and could utilize the image assistance without interfering with the forceps operation, reducing the gap from the VR. Unexpected organ injury could be avoided in all procedures. In biliary surgery, the projected virtual cholangiogram on the abdominal wall could advance safely with identification of the bile duct. For early gastric and colorectal cancer, the small tumors and blood vessels, which usually could not be found on the gastric serosa by laparoscopic view, were simultaneously detected on the body surface by carbon dioxide-enhanced MDCT. This provided accurate reconstructions of the tumor and involved lymph node, directly linked with optimization of the surgical procedures. Our non-invasive markerless registration using physiological markers on the body surface reduced logistical efforts. The image overlay technique is a useful tool when highlighting hidden structures, giving more information.
    No preview · Article · Oct 2009 · Journal of Hepato-Biliary-Pancreatic Sciences
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    ABSTRACT: Transgastric access is a major route in natural orifice translumenal endoscopic surgery (NOTES); gastrotomy should be performed unless it would damage surrounding organs in the peritoneal cavity. This article describes a novel rendezvous gastrotomy technique over a direct percutaneous endoscopic gastrostomy (PEG). In six live porcines, the gastrotomy involved applying a direct PEG through the abdominal wall into the stomach and exchanging to a needle trocar. An endoscopic balloon catheter was passed through the trocar by rendezvous technique. Then the inflated balloon and endoscope were advanced to the peritoneal cavity through the gastrotomy. Transgastric cholecystectomy was performed with a hybrid needle grasper through the same percutaneous site and the gastrotomy was closed with endoscopic clips. The rendezvous gastrotomy technique could reduce guidewire exchange. The success rate was 100% (6/6). Mean times for transgastric peritoneoscopy and cholecystectomy were 25.5 and 83.5 min. Mortality and morbidity was 0%. The addition of the extra trocar was unnecessary in all procedures. The advantage of this introduction system includes the creation of controlled gastric perforation, which is easier to close. It provides reliable transgastric access and increases safety. It simplifies transgastric NOTES and provides less invasive hybrid NOTES procedure.
    No preview · Article · Aug 2009 · Journal of Hepato-Biliary-Pancreatic Surgery
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    ABSTRACT: Purpose : We clarified the feasibility of inguinal hernia surgery by junior residents. Materials & Methods : We analyzed 139 retrospective cases of radical inguinal hernia surgery between April 2005 and December 2007. Of these, 134 involved mesh-plug repair and 5 Prolene hernia repair. We retrospectively compared the recurrence rate, the rate of complications, blood loss volume, operating time, and the length of postoperative hospital stay between patients treated surgically by junior residents (group R, n=72) and those treated by surgical staff (group S, n=67) . Results : Total rates of recurrence and complication were 5.8% in group R and 8.6% in group S, respectively. Significant statistical differences were seen between groups in recurrence rate (group R, 9.7%; group S, 1.5% : p<0.05) and operating time (group R, 88 min : group S, 64 min ; p<0.001). No statistically significant difference was seen in blood loss volume, rate of complications, or the length of postoperative hospital stay. Conclusions : The incidence of short-term complications in inguinal hernia surgery conducted by junior residents was identical to that of surgical staff. The high recurrence rate seen in inguinal hernia surgery by junior residents evoked, however, the need to implement surgical treatment guidelines for junior residents.
    No preview · Article · Jun 2009 · Nippon Shokaki Geka Gakkai zasshi
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    ABSTRACT: Natural orifice translumenal endoscopic surgery (NOTES) is a novel concept using an endoscope via a translumenal access for abdominal surgery. This study was designed to evaluate the feasibility and technical aspects of NOTES cholecystectomy from our experience on humans and animals. NOTES cholecystectomies were performed in 12 animal experiments, including 8 pigs (6 by transgastric and 2 by transvaginal accesses) and 4 dogs (4 transvaginal accesses), and a human female cadaver. The entire gallbladder could be removed under direct vision in all experiments. The average time was 60 min by transgastric and 40 min by transvaginal in animals. It was 87 min for human transvaginal cholecystectomy. In all animal and human procedures, there was no major complication concerning the operation. The transvaginal route may be the easiest route for abdominal NOTES. Percutaneous endoscopic gastrostomy (PEG) allowed the safe performance of a controlled gastric perforation and shortened the time. The hybrid method allowed performance of a safe procedure and shortened the time. Transvaginal and transgastric NOTES cholecystectomy is technically feasible and safe in both humans and animals. New instrumentation needs to be developed to perform a pure NOTES cholecystectomy without transabdominal assistance.
    No preview · Article · May 2009 · Journal of Hepato-Biliary-Pancreatic Surgery
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    ABSTRACT: The aim of this study was to examine correlations between pressure profile of the anal canal and postoperative defecatory disorder after sphincter-preserving operation (SPO) for rectal cancer. Using three-dimensional vector manometry, pressure profile and length of the anal canal were evaluated more than 1 year after SPO according to operation method and degree of postoperative defecatory function in 53 patients with rectal cancer. Compared with high anterior resection as a control, the anal canal was shorter in operations with a pelvic floor maneuver, namely, low anterior resection, ultra-low anterior resection, and intersphincteric resection. Patients with postoperative defecatory disorder showed significantly shorter anal canal length than patients with fair function. Length of the circular high-pressure zone (> or = 20 mmHg) < 20 mm in the resting state was a strong predictor of severe postoperative defecatory malfunction, with Wexner score> or =10. Operative maneuvers at the pelvic floor during SPO for rectal cancer may damage anal sphincter or levator ani muscles. The circular high-pressure zone can be measured only by three-dimensional manometry and may offer a useful indicator of sphincter damage after SPO for rectal cancer.
    No preview · Article · Apr 2009 · Journal of the American College of Surgeons
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    ABSTRACT: We report a rare case of breast cancer with cartilaginous and/or osseous metaplasia. A 59-year-old woman had a large lump in her left breast, which had enlarged gradually over a period of 2 years. Mammography, ultrasonography and aspiration cytology suggested phyllodes tumor with carcinoma. She underwent wide excision and sentinel lymph node biopsy. Because of the existence metastatic tumor cells in the sentinel lymph node on frozen section, sequential axillary lymph node dissection was conducted consequently. Histologically, the tumor consisted of invasive ductal carcinoma and spindle-cell carcinoma, including cartilaginous metaplasia. Adjuvant chemotherapy and whole-breast irradiation were performed. However, she died of multiple metastases to the liver 2 years after surgery. Breast cancer with cartilaginous and/or osseous metaplasia belongs to a special type of invasive carcinoma, and the incidence is very low. We here present our case and a review of the literature.
    No preview · Article · Feb 2009 · Breast Cancer

  • No preview · Article · Jan 2009 · Nihon Rinsho Geka Gakkai Zasshi (Journal of Japan Surgical Association)
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    ABSTRACT: After low anterior resection for rectal cancer, approximately 50% of patients experience defecatory malfunction such as multiple evacuations, urgency, and soiling. Since the neorectum is constructed with the remaining colonic segment, it can only substitute for the rectum to a limited extent. A straight anastomosis is most frequently used when the rectal remnant is sufficient, such as in high anterior resection. When the height of anastomosis is close to the anal sphincter, a J-pouch, a side-to-end, or a transverse coloplasty pouch are constructed to achieve better postoperative bowel function. The advantage of J-pouch reconstruction is not only the increased volume but also may be decreased motility when compared with straight reconstruction. In terms of postoperative function, the side-to-end and transverse coloplasty pouch have both been reported to exhibit similar functional results to J-pouch reconstruction. To obtain optimal functional results, pouch reconstruction should be considered, especially when the height of anastomosis is at the levator plane.
    No preview · Article · Oct 2008 · Nippon Geka Gakkai zasshi
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    ABSTRACT: We report two cases of eosinophilic cholangitis caused biliary obstruction. Case 1 : A 53-year-old woman referred for an abnormal biliary shadow in the liver found in a medical checkup was found in cholangiography to have a local biliary obstruction in the lateral segment of the liver. Suspecting cholangiocarcinoma, we conducted hepatic left lobectomy. Histopathologically resected specimen showed dense eosinophilic infiltration in the obstructive part of the bile duct. The postoperative course has remained uneventful in the 18 months since surgery. Case 2 : A 87-year-old woman with right hypochondrial pain, was found in cholangiography to have local obstruction and a stone in the lower bile duct. Histopathological diagnosis from biopsy of this lesion showed dense eosinophilic infiltration but no malignant cell. She was underwent endoscopic biliary dilation and endoscopic stone removal, and has remained symptom-free in the 17 months since surgery. Insofar as we could determine, there were only 18 cases have been reported as eosinophilic cholangitis. Some cases had been conducted invasive surgery for suspicious of malignancy. Recently increase of the clinical reports has made the entity of this disease elucidated gradually, it is thought the treatment with the endoscope becomes subject. Given the need for awareness of this clinical entity and for appropriate diagnosis, eosinophilic cholangitis should be treated by minimal invasion.
    No preview · Article · May 2008 · Nippon Shokaki Geka Gakkai zasshi

Publication Stats

426 Citations
73.85 Total Impact Points


  • 2009-2013
    • Teikyo University
      • Department of Surgery
      Edo, Tōkyō, Japan
  • 2006-2007
    • Chiba Cancer Center
      Tiba, Chiba, Japan
  • 1999-2003
    • Chiba University
      • Graduate School of Medicine
      Tiba, Chiba, Japan
    • Chiba University Hospital
      Tiba, Chiba, Japan