Akio Saiura

Japanese Foundation for Cancer Research, Edo, Tōkyō, Japan

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Publications (92)278.34 Total impact

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    ABSTRACT: To clarify the benefit of energy devices such as ultrasonically activated device and bipolar vessel sealing device in liver surgeries. Several studies have suggested the benefit of energy devices in liver transection, while a randomized trial has found no association between their use and surgical outcomes. Patients scheduled to undergo open liver resection were eligible for this multicenter non-blinded randomized study. They were randomized to receive an energy device (experimental group) or not (control group) during liver transection. The primary endpoint was the proportion of patients with intraoperative blood loss >1,000 mL. The primary aim was to show non-inferiority of hepatectomy with energy device to that without energy device. A total of 212 patients were randomized and 211 (105 and 106 in the respective groups) were analyzed. Intraoperative blood loss >1,000 mL occurred in 15.0 % patients with energy device and 20.2 % patients without energy device. The experimental minus control group difference was -5.2 % (95 % confidence interval -13.8 to 3.3 %; non-inferiority test, p = 0.0248). Hepatectomy with energy device resulted in a shorter median liver transection time (63 vs. 84 min; p < 0.001) and a lower rate of postoperative bile leakage (4 vs. 16 %; p = 0.002). The hypothesis that hepatectomy with energy device is not inferior to that without energy device in terms of blood loss has been demonstrated. The use of energy devices during liver surgery is clinically meaningful as it shortens the liver transection time and reduces the incidence of postoperative bile leakage.
    World journal of surgery. 01/2015;
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    ABSTRACT: To describe the details of the surgical technique of pancreatoduodenectomy (PD) with systematic mesopancreas dissection (SMD-PD), using a supracolic anterior artery-first approach. An artery-first approach in PD has been advocated in pancreatic cancer to judge resectability, clear the superior mesenteric artery margin from invasion, or reduce blood loss. However, the efficacy of an artery-first approach in mesopancreas dissection remains unclear. This study involved 162 consecutive patients who underwent PD with curative intent. The patients were divided into 82 SMD-PDs and 80 conventional PDs (CoPD) and then stratified further according to the dissection level, that is, level 1 was applied to 24 simple mesopancreas divisions for early inflow occlusion including 11 SMD-PDs, level 2 for 63 en bloc mesopancreas resections (26 SMD-PDs), and level 3 for 75 patients who underwent a hemicircumferential superior mesenteric artery plexus resection to keep the margin free from cancer invasion (45 SMD-PDs). The clinical and imaging results were collected to assess the feasibility and validity of SMD-PD with an artery-first approach. Blood loss and operation duration were significantly less in the SMD-PD group than in the CoPD group among the total 162 patients. The imaging analysis showed that four fifths of pancreatic arterial branches came from the right dorsal aspect of the superior mesenteric artery and cancer abutment occurred exclusively from the same direction indicating the validity of an artery-first approach. SMD-PD using an SAA is feasible across PD cases, with acceptable short-term outcomes, and we propose this procedure as a promising option for PD.
    Annals of surgery. 01/2015;
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    ABSTRACT: Background Splenic vein ligation may result in sinistral (left-sided) portal hypertension and gastrointestinal haemorrhage. The aim of this study was to analyse the pathogenesis of sinistral portal hypertension following splenic vein ligation in pancreaticoduodenectomy.Methods Patients who underwent pancreaticoduodenectomy for pancreatic cancer between January 2005 and December 2012 were included in this retrospective study. The venous flow pattern from the spleen and splenic hypertrophy were examined after surgery.ResultsOf 103 patients who underwent pancreaticoduodenectomy with portal vein resection, 43 had splenic vein ligation. There were two predominant venous flow patterns from the spleen. In the varicose route (27 patients), flow from the spleen passed to colonic varices and/or other varicose veins. In the non-varicose route, flow from the spleen passed through a splenocolonic collateral (14 patients) or a spontaneous splenorenal shunt (2 patients). The varicose route was associated with significantly greater splenic hypertrophy than the non-varicose route (median splenic hypertrophy ratio 1·52 versus 0·94; P < 0·001). All patients with the varicose route had colonic varices, and none had a right colic marginal vein at the hepatic flexure.Conclusion Pancreaticoduodenectomy with splenic vein ligation may lead to sinistral portal hypertension. To avoid the development of varices, it is important to preserve the right colic marginal vein. Reconstruction of the splenic vein should be considered if the right colic marginal vein is divided.
    British Journal of Surgery 12/2014; · 4.84 Impact Factor
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    ABSTRACT: Recent studies suggest that systemic inflammatory response is closely associated with cancer patient prognosis. Although several inflammatory prognostic markers have been proposed, the data to support their validity are lacking in large Japanese cohorts.
    Japanese Journal of Clinical Oncology 10/2014; · 1.75 Impact Factor
  • Annals of Surgery 10/2014; · 7.19 Impact Factor
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    ABSTRACT: Background Cholangiocarcinoma has been reported in workers exposed to chlorinated organic solvents and has consequently been classified as an occupational disease (occupational cholangiocarcinoma) by the Japanese Ministry of Health, Labour and Welfare. This study aimed to identify the characteristics of nine workers newly diagnosed with occupational cholangiocarcinoma.Methods This study was a retrospective study conducted in 13 hospitals and three universities. Clinicopathological findings of nine occupational cholangiocarcinoma patients from seven printing companies in Japan were investigated and compared with 17 cholangiocarcinoma patients clustered in a single printing company in Osaka.ResultsPatient age at diagnosis was 31–57 years. Patients were exposed to 1,2-dichloropropane and/or dichloromethane. Serum γ-glutamyl transpeptidase activity was elevated in all patients. Regional dilatation of the intrahepatic bile ducts without tumor-induced obstruction was observed in two patients. Four patients developed intrahepatic cholangiocarcinoma and five developed hilar cholangiocarcinoma. Biliary intraepithelial neoplasia and/or intraductal papillary neoplasm of the bile duct was observed in four patients with available operative or autopsy specimens.Conclusions Most of these patients with occupational cholangiocarcinoma exhibited typical findings, including high serum γ-glutamyl transpeptidase activity, regional dilatation of the bile ducts, and precancerous lesions, similar to findings previously reported in 17 occupational cholangiocarcinoma patients in Osaka.
    Journal of Hepato-Biliary-Pancreatic Sciences. 09/2014; 21(11).
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    ABSTRACT: The rate of recurrence after liver resection for colorectal liver metastases (CLM) is high, and repeat resection (RR) is reserved with curative intent in selected patients. This study evaluated the benefit of RR for recurrence after liver resection for CLM.
    Annals of Surgical Oncology 06/2014; · 3.94 Impact Factor
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    ABSTRACT: To investigate the feasibility and efficacy of anatomical liver resection (ALR) guided by fused images comprising a macroscopic view and indocyanine green fluorescence imaging (fusion IGFI).
    Annals of Surgery 05/2014; · 7.19 Impact Factor
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    ABSTRACT: Although the molecular mechanism of desmoplastic reaction (DR) for providing aggressive tumor characteristics is increasingly recognized, the prognostic role of DR has not been investigated in colorectal liver metastasis (CRLM). A pathologic review of 412 patients who underwent hepatectomy for CRLM at 2 independent institutions was conducted. DR in primary tumors was classified as mature, intermediate, or immature on the basis of the existence of keloid-like collagen and myxoid stroma-distinctive histologic products of extracellular matrix remodeling. With respect to DR, 137, 122, and 153 patients were classified as mature, intermediate, and immature, respectively. Immature DRs were associated with higher T and N stages, higher primary tumor grade, synchronous and larger size of liver metastasis, and extrahepatic disease (P≤0.0001 to 0.002). DR significantly influenced the rate of recurrence in extrahepatic sites, including the lung, peritoneum, and local region in the primary tumor (P≤0.0001 to 0.03), rather than the remnant liver. Five-year overall survival rates after hepatectomy were the highest in the mature group (58.9%), followed by intermediate (42.1%) and immature (26.7%) groups. A significant prognostic impact of DR was observed in subset analyses for institutions, primary tumor location, and timing and number of liver metastases. Multivariate analysis revealed that DR was an independent prognostic factor along with T stage of the primary tumor, size of liver metastasis, and extrahepatic disease. Characterizing DR in the primary tumor on the basis of histologic products of cancer-associated fibroblasts is valuable in evaluating prognostic outcome after hepatectomy in CRLM patients.
    The American journal of surgical pathology 05/2014; · 4.59 Impact Factor
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    ABSTRACT: Abstract Objective. As a minimally invasive modality, radiofrequency ablation (RFA) has been increasingly applied not only for the treatment of hepatocellular carcinoma, but also for that of colorectal liver metastasis (CLM). However, RFA for CLM has been shown to be associated with a high local recurrence rate, and no optimal treatment for RFA failure has been established yet. The aim of this study was to evaluate the feasibility and outcome of surgical resection for local recurrence after RFA. Material and methods. A retrospective study of 17 patients, who underwent surgery for local recurrence after RFA for resectable CLM, was carried out. The surgical procedures involved in the actual surgery were compared with those envisioned for the primary resection if RFA had not been selected. Results. Surgical resection for RFA recurrence was more invasive than the envisioned surgical procedure in 10 cases (58%). In addition, the proportions of cases that required technically demanding procedures among the patients receiving surgery for RFA recurrence were higher than those in envisioned operations; major hepatectomy, eight cases [47%] versus two cases [12%] (p < 0.0205); excision and/or reconstruction of the major hepatic veins, three cases [18%] versus zero case [0%] (p = 0.035); excision of diaphragm: three cases [18%] versus zero case [0%] (p = 0.035). The 1-, 3- and 5-year overall survival rates were 92%, 45% and 45%, respectively. Conclusions. Surgical resection for RFA recurrence for CLM required more invasive and technically demanding procedures. Thus, RFA for CLM should be limited to unresectable cases, and patients with resectable CLM should be thoroughly advised not to undergo RFA, but rather surgical resection.
    Scandinavian Journal of Gastroenterology 03/2014; · 2.33 Impact Factor
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    ABSTRACT: Preoperative chemotherapy sometimes makes colorectal liver metastases disappear or diminish. Contrast-enhanced intraoperative ultrasound (CE-IOUS) using perflubutane may identify such metastases. Among 131 consecutive patients who underwent hepatic resection, 86 had received preoperative chemotherapy. Of these patients, 72 were examined using contrast-enhanced computed tomography (CE-CT), gadolinium ethoxybenzyl diethylenetriamine pentaacetic acid-enhanced magnetic resonance imaging (EOB-MRI), contrast-enhanced ultrasound (CEUS), intraoperative ultrasound (IOUS), and CE-IOUS; these patients were the subject of the present study. Effects of IOUS and CE-IOUS to search for disappearing liver metastases (DLM) and tumors with a diameter of 1 cm or less based on the preoperative imaging were assessed. A total of 32 DLMs were noted in 11 patients. Four DLMs were identified using IOUS, and 16 DLMs (including the four DLMs identified using IOUS) were identified using CE-IOUS. Of the 16 DLMs that were missed using both IOUS and CE-IOUS, nine were resected using anatomical resection and seven were not resected. One of the nine resected DLMs was histologically proven to be adenocarcinoma. Three of the seven unresected DLMs showed tumor regrowth during a postoperative follow-up examination. CE-IOUS identified 79 % of the 19 DLMs that were ultimately confirmed as liver metastases, whereas IOUS identified 21 % of them (p < 0.004). Among the 202 tumors that were identified using preoperative imaging, 54 were 1 cm or less in diameter. The sensitivity of CE-IOUS for these tumors were superior to CE-CT (p < 0.04) and IOUS (p < 0.04), respectively. CE-IOUS might be necessary after preoperative chemotherapy for colorectal liver metastasis.
    Annals of Surgical Oncology 02/2014; · 3.94 Impact Factor
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    ABSTRACT: The use of adjuvant systemic chemotherapy for resectable liver metastases from colorectal cancer (CRC) is controversial because no trial demonstrated its benefit. We conducted the phase III trial to evaluate UFT/leucovorin (LV) for colorectal liver metastases (CRLM). The primary endpoint has not been available until 2014, we first report the feasibility and safety data of UFT/LV arm. In this multicenter trial, patients who underwent curative resection of liver metastases from colorectal cancer were randomly assigned to receive surgery alone or surgery followed by adjuvant chemotherapy with UFT/LV. The primary endpoint was relapse-free survival. Secondary endpoints included overall survival and safety. A total of 180 patients were enrolled, 90 were randomly assigned to receive UFT/LV therapy. Eighty two of whom were included in safety analyses. In the UFT/LV group, the completion rate of UFT/LV was 54.9%, the relative dose intensity was 70.8% and grade 3 or higher adverse events occurred in 12.2% of the patients. Elevated bilirubin levels, decreased hemoglobin levels, elevated alanine aminotransferase levels, diarrhea, anorexia were common. Most other adverse events were grade 2 or lower and tolerable. In conclusions, UFT/LV is a safe regimen for postoperative adjuvant chemotherapy in patients who have undergone resection of liver metastases from colorectal cancer. Further studies are warranted to improve completion rate, but UFT/LV is found to be a promising treatment in this setting.
    Drug discoveries & therapeutics. 01/2014; 8(1):48-56.
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    ABSTRACT: Although a number of studies have reported acquired drug resistance due to administration of epidermal growth factor receptor antibody inhibitors, the underlying causes of this phenomenon remain unclear. Here we report a case of a 75-year-old man with liver metastasis at 3 years after a successful transverse colectomy to treat KRAS wild-type colorectal cancer. While initial administration of epidermal growth factor receptor inhibitors proved effective, continued use of the same treatment resulted in new peritoneal seeding. An acquired KRAS mutation was found in a resected tissue specimen from one such area. This mutation, possibly caused by administration of epidermal growth factor receptor inhibitors, appears to have conferred drug resistance. The present findings suggest that administration of epidermal growth factor receptor inhibitors results in an acquired KRAS mutation that confers drug resistance.
    BMC Research Notes 12/2013; 6(1):508.
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    ABSTRACT: Pancreas-sparing duodenectomy (PSD) is a promising alternative procedure to pancreaticoduodenectomy for the treatment of duodenal tumors with low-grade malignant behavior. Between March 2003 and September 2012, PSD was performed in 7 patients with a gastrointestinal stromal tumor (GIST) in the second (n = 5) or third (n = 2) portions of the duodenum. The short- and long-term outcomes of treatment were analyzed in all patients. The median blood loss was 160 mL, and the median operative time was 315 minutes. No pancreatic leakage or perioperative mortality occurred. Surgical margins were negative in all cases. All patients were alive at the median follow-up time of 42 months after PSD. The recurrence-free 5-year survival rate was 53% in all patients. Hepatic metastases developed in 2 of the 5 patients with high- or intermediate-grade risks at the time of diagnosis. Hepatic resection was performed, and imatinib mesylate was administered in the 2 cases. Good short- and long-term outcomes and surgical curability were observed in patients treated with PSD for duodenal GIST.
    American journal of surgery 10/2013; · 2.36 Impact Factor
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    ABSTRACT: The efficacy of repeat hepatectomy for recurrent hepatocellular carcinoma and colorectal liver metastases is widely accepted. However, the benefits of such treatment for intrahepatic recurrence of gastric cancer liver metastasis remain unknown. This study sought to clarify the survival benefit for patients undergoing repeat hepatectomy for gastric cancer liver metastasis. A total of 73 patients underwent hepatectomy for gastric cancer liver metastasis from January 1993 to January 2011. Macroscopically curative surgery was performed in 64 patients. Among them, repeat hepatectomy was performed in 14 of the 37 patients with intrahepatic recurrence. Among these 14 patients, clinicopathologic factors were evaluated by univariate and multivariate analysis to identify the factors affecting survival. The overall 1-, 3-, and 5-year survival rates after a second hepatectomy were 71, 47, and 47 %, respectively. The median survival was 31 months. Operative morbidity and mortality rates of repeat hepatectomy were 29 and 0 %, respectively. Multivariate analysis identified the duration of the disease-free interval as the only independent significant factor predicting better survival. In selected patients, repeat hepatectomy for recurrent gastric cancer liver metastasis may offer the same chance of cure as the primary hepatectomy. Disease-free intervals exceeding 12 months predict good patient survival after repeat hepatectomy.
    World Journal of Surgery 08/2013; 37(11). · 2.35 Impact Factor
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    ABSTRACT: Liver resection is now widely accepted as a potentially curative treatment for colorectal liver metastasis. However, the efficacy of surgical resection for gastric cancer liver metastasis(GLM)remains unclear. Based on our 18-year experience with 64 patients who underwent curative hepatectomy for GLM, we discuss the indication and efficacy of surgical resection for GLM. From January 1993 to January 2011, 73 patients underwent hepatectomy for GLM in the Department of Gastroenterological Surgery, Cancer Institute Ariake Hospital(Japanese Foundation for Cancer Research), Japan. The actuarial1 -, 3-, and 5-year overall survival rates and 1-, 3-, and 5-year recurrence-free survival rates of those 64 patients who achieved curative resections were 84, 50, and 37%, and 42, 27, and 27%, respectively. By multivariate analysis, serosal invasion of the primary gastric cancer and larger hepatic tumor(>5 cm in diameter)were found to be independent indicators of poor prognosis. Based on the multivariate analysis results, all patients were divided into three groups no poor prognostic factor(n=38), one poor prognostic factor(n=24), and two poor prognostic factors(n=2). The actuarial overall survival rates of each group were 63, 36, and 0% at 3 years, and 53, 15, and 0% at 5 years. GLM patients having hepatic tumors with the maximum diameter of <5 cm, and without serosalinvasion of the primary gastric cancer, are the best candidates for hepatectomy.
    Gan to kagaku ryoho. Cancer & chemotherapy 12/2012; 39(13):2455-9.
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    ABSTRACT: A 70-year-old woman was referred to our hospital because of abdominal pain. Abdominal computed tomography(CT)and colonoscopy revealed transverse colon cancer with multiple liver metastases, with involvement of the hepatic pedicle and superior mesenteric artery lymph nodes. The patient received eight courses of XELOX plus bevacizumab, and CT showed a decrease in the size of the liver metastases and hepatic pedicle lymphadenopathy. Right hemicolectomy, partial hepatectomy, and hepatic pedicle lymph node resection were performed. Histopathological examination of the resected tissue revealed no residual cancer cells, suggesting a pathological complete response. The patient remains well 7 months after operation, without any signs of recurrence. Surgical resection should be considered for patients with initially unresectable colon cancer with liver metastases and hepatic pedicle lymph nodes involvement if systemic chemotherapy is effective.
    Gan to kagaku ryoho. Cancer & chemotherapy 12/2012; 39(13):2561-3.
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    ABSTRACT: Key Words: Hepatocellular carcinoma; Preoperative transarterial chemoembolization recurrent; Prognosis. Abbreviations: Hepatocellular Carcinoma (HCC); Transarterial Chemoembolization (TACE); Retention Rate of indocyanine green 15 minutes after the injection (ICG-R15); Alpha- Fetoprotein (AFP); Des-Gamma-Carboxy Prothrombin (DCP); Hepatitis B Virus (HBV); Hepatitis C Virus (HCV).Background/Aims: The effects of transarterial chemoembolization (TACE) prior to hepatectomy for patients with hepatocellular carcinoma (HCC) are controversial. Methodology: Clinicopathological profiles and prognosis were compared between patients who underwent hepatic resection following preoperative TACE (Group A, 69 patients) or only resection (Group B, 158 patients). Univariate and multivariate analyses were used to evaluate whether TACE influenced patient prognosis. Results: Profiles of Group A were comparable with those of Group B except for younger age, higher frequency of major hepatectomy, higher incidence of positive surgical margin, vascular invasion and poorly differentiated HCC. Overall survival was significantly worse in Group A than in Group B (5- year survival rate; 29% vs. 69%; p<0.001). A subset of patients in Group A with complete tumor necrosis by TACE showed comparable survival with Group B. Multivariate analysis revealed that preoperative TACE (hazard ratio (HR)=4.3; 95% confidential interval (CI), 2.8-6.6), non-anatomic resection (HR=1.6; 95% CI, 1.1-2.4), blood loss >1L (HR=1.8; 95% CI=1.1- 2.8) and vascular invasion (HR=2.3; 95% CI=1.4- 3.6) were independent predictors of poor survival. Preoperative TACE was also an independent predictor of extrahepatic metastases (odds ratio, 2.8; 95% CI=1.1- 7.1). Conclusions: Preoperative TACE should not be routinely applied for HCC.
    Hepato-gastroenterology 10/2012; 59(119):2295-9. · 0.91 Impact Factor
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    ABSTRACT: Key Words: Hepatocellular carcinoma; Recurrent; Persistent; Hepatic resection. Abbreviations: Hepatocellular Carcinoma (HCC); Recurrent HCC (HCCR); Transarterial Chemoembolization (TACE); Percutaneous Ethanol Injection (PEI); Radiofrequency Ablation (RFA); Hepatitis B Virus Surface Antigen (HBs-Ag); Hepatitis C Virus Antibody (HCVAb); Computed Tomography (CT); Magnetic Resonance Imaging (MRI); Overall Survival (OS); Recurrence Free Survival (RFS).Background/Aims: The safety and effectiveness of hepatic resection for recurrent or refractory hepatocellular is not established, particularly in cases treated by non-surgical treatment. Methodology: Surgical outcomes of 38 patients who underwent curative hepatic resection for recurrent or refractory disease after previous treatment were evaluated. Univariate and multivariate analyses were performed to identify prognostic predictors. Results: There were no postoperative deaths, morbidity occurred in 9 patients (prolonged ascites retention, 5; biliary fistula, 3; intraabdominal abscess, 1), and all of them were treated conservatively. Recurrence-free and overall 1, 3 and 5-year-survival rate was 54, 28 and 24%, and 78, 60 and 55%, respectively. Multivariate analysis revealed hepatitis B or C virus infection (HR=12.8; 95% CI=2.3-245.1), tumor size >5cm (HR=5.9; 95% CI=5.9-25.6), and vasculo- biliary invasion (HR=5.2; 95% CI=1.4-21.0) were independent predictors of poor overall survival. Type of previous treatment did not influence prognosis. Conclusions: Hepatic resection for recurrent or refractory hepatocellular carcinoma is safe and achieves long survival in selected patients.
    Hepato-gastroenterology 10/2012; 59(119):2255-9. · 0.91 Impact Factor
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    ABSTRACT: The indication for hepatectomy in cases of gastric cancer liver metastases (GLM) remains unclear and it remains controversial whether surgical resection is beneficial for GLM. The objective of this retrospective study was to clarify the indications for and benefit of hepatectomy for GLM. Seventy-three patients underwent hepatectomies for GLM from January 1993 to January 2011. Macroscopically complete (R0 or R1) resection was achieved in 64 patients. Among them, 32 patients underwent synchronous hepatectomy with gastrectomy and the remaining 32 patients underwent metachronous hepatectomy. Repeat hepatectomy was done in 14 patients for resectable intrahepatic recurrences. Clinicopathological factors were evaluated by univariate and multivariate analyses among patients who received macroscopically complete resection for those affecting survival. The overall 1-, 3-, and 5-year survival rates after macroscopically complete (R0 or R1) liver resection (n = 64) for GLM were 84, 50, and 37 %, respectively, with a median survival of 34 months. Univariate analysis identified serosal invasion of the primary gastric cancer and blood transfusions during surgery as poor prognosis indicators. By multivariate analysis, serosal invasion of the primary gastric cancer and larger hepatic tumor (>5 cm in diameter) were found to be independent indicators of poor prognosis. GLM patients with the maximum diameter of hepatic tumors of <5 cm and without serosal invasion of the primary gastric cancer are the best candidate for hepatectomy.
    Langenbeck s Archives of Surgery 05/2012; 397(6):951-7. · 1.89 Impact Factor

Publication Stats

3k Citations
278.34 Total Impact Points


  • 2005–2014
    • Japanese Foundation for Cancer Research
      • Department of Urology
      Edo, Tōkyō, Japan
  • 2001–2011
    • University Hospital Medical Information Network
      Edo, Tōkyō, Japan
  • 2010
    • National Defense Medical College
      • Department of Surgery
      Tokorozawa, Saitama-ken, Japan
  • 1999–2007
    • The University of Tokyo
      • • Division of Surgery
      • • Faculty & Graduate School of Medicine
      • • Research Center for Advanced Science and Technology
      Edo, Tōkyō, Japan