Mitsuyoshi Ota

Yokohama City University, Yokohama, Kanagawa, Japan

Are you Mitsuyoshi Ota?

Claim your profile

Publications (35)59.53 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: The feasibility of using reduced-port laparoscopic total gastrectomy (RPLTG) for the treatment of gastric cancer remains unclear. This study aimed to address the potentially important advantages of this surgical technique.
    11/2014;
  • [Show abstract] [Hide abstract]
    ABSTRACT: AimThe indications for intersphincteric (ISR) anterior resection are not clearly defined. The aim of this study was to evaluate vertical extension of T2 or T3 low rectal cancer treated by rectal amputation to optimize patient selection for ISR.Method The abdominoperineal excision specimens of T2 or T3 low rectal cancer from 53 patients treated between 1992 and 2004 were retrospectively reviewed. Vertical invasion was quantified by measuring the shortest distance between the tumour and the striated muscle (T-SM), assuming that this represented the surgical margin that would have be achieved had an ISR been performed.ResultsInvolvement of the dentate line (DL) and intramural distal spread were independent risk factors for T-SM ≤2 mm. T-SM was less when the inferior border of the tumour was on the distal side of the DL (r =0.572, p <0.001). The probability of involvement of the DL, intramural distal spread, or either one of these being associated with T-SM ≤2 mm was 43%, 46%, and 43%. All patients without both intramural distal spread and involvement of the DL had a T-SM greater than 2 mm.Conclusion We recommend that ISR be performed only for patients with T2 or T3 low rectal cancer in whom the lowest edge of the tumour is above the DL and there is no intramural distal spread. Such patients are relatively unlikely to have a T-SM of or equal to 2 mm.This article is protected by copyright. All rights reserved.
    Colorectal Disease 09/2014; · 2.08 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Colorectal flat-type tumors include laterally spreading tumors (LSTs) and flat depressed-type tumors. The former of which shows a predominant lateral spreading growth rather than an invasive growth. The present study examined the morphological characteristics of LSTs, in comparison with polypoid- or flat depressed-type tumors, along with the expression of atypical protein kinase C (aPKC) λ/ι, a pivotal cell polarity regulator, and the hallmarks of cell polarity, as well as with type IV collagen, β-catenin and E-cadherin. In total, 37 flat-type (24 LSTs and 13 flat depressed-type tumors) and 20 polypoid-type colorectal tumors were examined. The LSTs were classified as 15 LST adenoma (LST-A) and nine LST cancer in adenoma (LST-CA). An immunohistochemical examination was performed on aPKC λ/ι, type IV collagen, β-catenin and E-cadherin. The LST-A and -CA showed a superficial replacing growth pattern, with expression of β-catenin and E-cadherin in the basolateral membrane and type IV collagen along the basement membrane. In addition, 86.6% of LST-A and 55.6% of LST-CA showed aPKC λ/ι expression of 1+ (weak to normal intensity staining in the cytoplasm compared with the normal epithelium). Furthermore, ~45% of the polypoid-type adenomas showed 2+ (moderate intensity staining in the cytoplasm and/or nucleus) and 66.7% of the polypoid-type cancer in adenoma were 3+ (strong intensity staining in the cytoplasm and nucleus). A statistically significant positive correlation was observed between the expression of aPKC λ/ι and β-catenin (r=0.842; P<0.001), or type IV collagen (r=0.823; P<0.001). The LSTs showed a unique growth pattern, different from the expanding growth pattern presented by a polypoid tumor and invasive cancer. The growth characteristics of LST appear to be caused by adequate coexpression of β-catenin, type IV collagen and aPKC λ/ι.
    Oncology letters 09/2014; 8(3):977-984. · 0.24 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Background:CD133 and CD44 are putative cancer stem cell (CSC) markers in colorectal cancer (CRC). However, their clinical significance is currently unclear. Here, we evaluated primary CRC cell isolates to determine the significance of several CSC markers, including CD133 and CD44, as predictors of tumourigenesis and prognosis.Methods:CD133- and CD44-positive cells from fresh clinical samples of 77 CRCs were selected by flow cytometric sorting and evaluated for tumourigenicity following subcutaneous transplantation into NOD/SCID mice. Cancer stem cell marker expression was examined in both xenografts and a complementary DNA library compiled from 167 CRC patient samples.Results:CD44(+), CD133(+) and CD133(+)CD44(+) sub-populations were significantly more tumourigenic than the total cell population. The clinical samples expressed several transcript variants of CD44. Variant 2 was specifically overexpressed in both primary tumours and xenografts in comparison with the normal mucosa. A prognostic assay using qRT-PCR showed that the CD44v2(high) group (n=84, 5-year survival rate (5-OS): 0.74) had a significantly worse prognosis (P=0.041) than the CD44v2(low) group (n=83, 5-OS: 0.88).Conclusions:CD44 is an important CSC marker in CRC patients. Furthermore, CRC patients with high expression of CD44v2 have a poorer prognosis than patients with other CD44 variants.British Journal of Cancer advance online publication, 12 June 2014; doi:10.1038/bjc.2014.253 www.bjcancer.com.
    British journal of cancer. 06/2014;
  • [Show abstract] [Hide abstract]
    ABSTRACT: Although surgeons have tried to reduce the number of ports in order to achieve better cosmesis and less postoperative pain, it may lead to increased risk for complications. Herein, we introduce a technique, "laparoscopic bowel-lifting (LBL) technique," which helps to reduce ports without additional trocars. The mesocolon is pierced near the line of transaction using the pair of dissecting forceps. A 1-0 Vicryl suture is introduced into the abdominal cavity using a grasping needle and passed through the mesocolon. The colon is retracted using the suture and fixed to the abdominal wall using a pair of forceps. Thereafter, traction is placed on the main nutrient artery. Mobilization of the rectum is performed after moving the traction to the cranial side by using a grasping needle. As the rectal tube was pulled toward the cranial side, it is possible to identify the mesorectum with a good visual field. We performed this procedure in 100 consecutive patients with rectal cancer who underwent curative laparoscopic low anterior resection (Lap-LAR) between November 2001 and March 2010. The median duration of follow-up after Lap-LAR was 53.2 months. The tumor was located in the middle rectum in 75 patients and in the lower rectum in 25 patients. The stage grouping on the basis of the TNM classification was as follows: stage 0, 6; stage I, 46; stage II, 18; and stage III, 30. The number of trocars used in the LBL group was 3 or 4. No LBL cases used 5 trocars. No operative complications were attributable to this technique. The overall rates of anastomotic leakage and morbidity were 10.0% and 33.0%, respectively. The 5-year relapse-free and 5-year overall survival rates were stage 0, 100/100; stage I, 93.3/96.8; stage II, 81.5/88.5; and stage III, 74.5/75.7. LBL technique is feasible for performing Lap-LAR. This method reduces the number of ports and might help to introduce a single-incisional surgery.
    Surgical laparoscopy, endoscopy & percutaneous techniques 04/2014; 24(2):e46-50. · 0.88 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Background and Objectives Sushi repeat-containing protein X-linked 2 (SRPX2) was first described as a downstream target gene for E2A-HLA, which causes pro-B acute leukemia. SRPX2 is considered to promote cellular migration and adhesion in cancers. Our objective was to evaluate the relative expression of the SRPX2 gene and to determine whether such expression correlates with outcomes in patients with gastric cancer.Methods Surgical specimens of cancer tissue and adjacent normal mucosa obtained from 227 patients with previously untreated gastric cancer were examined. SRPX2 mRNA expression levels of cancer tissue and adjacent normal mucosa were measured by quantitative real-time polymerase chain reaction. We evaluated the clinicopathological significance of the relative expression of SRPX2 in patients with gastric cancer.ResultsSRPX2 expression was higher in cancer tissue than in adjacent normal mucosa (P < 0.001). On analysis of the relations between gene expression and clinicopathological factors, SRPX2 expression correlated with tumor size and distant metastasis. Overall survival was significantly lower in patients whose tumors had high SRPX2 expression than in those who had low SRPX2 expression (P = 0.003). Multivariate analysis showed that high SRPX2 expression was an independent predictor of survival (HR = 2.028, 95% CI = 1.265–3.251).ConclusionsSRPX2 expression was significantly higher in gastric cancer tissue than in adjacent normal mucosa, and overexpression of the SRPX2 gene is considered a useful independent predictor of outcomes in patients with gastric cancer. J. Surg. Oncol. © 2014 Wiley Periodicals, Inc.
    Journal of Surgical Oncology 03/2014; · 2.64 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We report a case of perivascular epithelioid cell tumor arising in the rectum of a 55-year-old woman. The tumor was treated by transanal endoscopic microsurgery. After 1 year follow-up, the patient is alive with no radiologic or endoscopic evidence of recurrence. Perivascular epithelioid cell tumor is a rare mesenchymal tumor characterized by co-expression of melanocytic and smooth muscle markers. This rare tumor can arise in various organs, including the falciform ligament, uterus, uterine cervix, liver, kidney, lung, breast, cardiac septum, pancreas, prostate, thigh, and gastrointestinal tract. Perivascular epithelioid cell tumor of the gastrointestinal tract is very rare, with only 23 previously reported cases. We review the literature on perivascular epithelioid cell tumors arising in the gastrointestinal tract.
    World Journal of Surgical Oncology 01/2014; 12(1):12. · 1.09 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Although obesity is considered as a risk factor for postoperative morbidity in abdominal surgery, its effect on the outcomes of laparoscopic-assisted colectomy (LAC) is still unclear. The technical difficulty and risk factor for postoperative complication in LAC are thought to be influenced by visceral obesity. The aim of this prospective study was to evaluate the impact of visceral fat on the surgical outcomes of LAC. Between April 2005 and December 2010, consecutive patients with preoperatively diagnosed colon cancer, excluding medium and low rectal cancer, who underwent LAC, were enrolled. Their visceral fat area (VFA) and body mass index (BMI) were prospectively collected. The VFA was assessed by Fat Scan software. The patients were classified into two groups as follows: VFA nonobese with VFA <100 cm(2) (VNO) and VFA obese with VFA ≧100 cm(2) (VO). The predictive factors for surgical complications of LAC were evaluated by univariate and logistic regression analyses. A total of 338 consecutive patients were enrolled in this study. Of the 338 patients, 194 (57.4 %) and 138 (42.6 %) were classified into the VNO and VO groups, respectively. Logistic regression analysis showed that high BMI (≧25 kg/m(2)) and VO independently predicted the incidence of overall postoperative complications (p = 0.040 and 0.007, respectively). VO was more highly related to the incidence of overall postoperative complications, anastomotic leakage (p = 0.021), and surgical site infection (SSI) (p = 0.013) than high BMI. VFA is a more useful parameter than BMI in predicting surgical outcomes after LAC.
    International Journal of Colorectal Disease 12/2013; · 2.24 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Background and Aim: Advanced hepatocellular carcinoma (HCC) with portal vein invasion or intrahepatic metastases has an unfavorable prognosis, even after curative hepatic resection. The aim of the present study was to evaluate the efficacy of adjuvant hepatic arterial infusion chemotherapy with 5-fluorouracil (5-FU) and systemic interferon (IFN). Patients who were diagnosed as having HCC with portal vein invasion or intrahepatic metastases were included in the study (n=33). Out of these patients, 16 were treated with adjuvant therapy consisting of continuous arterial infusion of 5-FU and subcutaneous injection of IFN-α. Another 17 patients who underwent hepatic resection without adjuvant chemotherapy served as controls. The five-year cumulative survival rate was significantly higher in the adjuvant treatment group (71.1%) than in the control group (44.0%; p=0.023). The rate of patients with multiple (≥4) recurrent intrahepatic nodules was significantly lower in the adjuvant group (44.4%) than in the control group (100%; p=0.040). The development of intrahepatic recurrence within 12 months was significantly lower in the adjuvant group (33.3%) than in the control group (80.0%; p=0.040). Our data suggest that this adjuvant chemotherapy can improve postoperative prognosis by reducing intrahepatic recurrence.
    Anticancer research 12/2013; 33(12):5585-90. · 1.71 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: In surgical treatment of elderly patients, securing the safety of surgery and radical cure must be balanced. Our purpose was to verify the safety and validity of laparoscopic surgery for the treatment of colorectal cancer in elderly patients. Patients with cTis-T4a colorectal cancer who were 75 years or older were randomized to receive open or laparoscopic surgery. Exclusion criteria were patients who had a bulky tumor, rectal cancer that required pelvic side wall lymphadenectomy, and history of colon resection. Patients were divided according to tumor location (right colon, left colon, and rectum). The short-term outcomes were compared between the two groups. One hundred patients (right 43, left 28, and rectum 29) were registered in each group from August 2008 to August 2012. There were no differences in patient characteristics between the two groups. Three patients were converted from laparoscopic to open, because of bleeding, excision of peritoneum metastasis, and patient's desire, respectively. In the short-term results (open:laparoscopic), there were significant differences in the rates of complications (36:23 %) and ileus (12:4 %), amount of blood loss (157:63 mL), and duration of surgery (150:172 min). There were no significant differences in the pathological margins, and the number of dissected lymph nodes. In the subgroup analysis according to the tumor location, there were significant differences in the rate of complications (39.4:22.5 %), amount of blood loss (135:42 mL), duration of surgery (139:160 min), and length of postoperative stay (13.0:10.0 days) in the colon cancer. There were no significant differences in short-term results in the rectal cancer. Laparoscopic surgery in elderly colorectal cancer patients did not result in a difference in radical cure compared with open surgery, and the short-term results except the duration of surgery were excellent. It is an effective procedure for elderly patients with colorectal cancer, especially colon cancer.
    Surgical Endoscopy 10/2013; · 3.43 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Background/Aim: This study assessed the toxicity and activity of biweekly docetaxel and S-1 combination therapy in elderly patients with advanced gastric cancer. One-hundred and thirteen patients were enrolled: 35 were 75 years old or more. The objective response rate, toxicity, progression-free survival (PFS), and overall survival (OS) were compared. Dose reduction was significantly frequent in the elderly group (24/35 versus 25/78, p<0.001). The overall response rate was 54.9%. Out of these, 18 (15.9%) underwent gastrectomy (13 R0 gastrectomy). The median OS was 17.3 months and the median PFS was 8.0 months. Neutropenia was the most frequently observed hematological toxicity at grade 3 and 4 (34.5%), followed by leukopenia (24.8%). Most non-hematological toxicities were of grade 1 or 2. There were no significant differences in overall response rate, median OS, median PFS, or toxicities between the two groups. This combination offers favourable survival benefits with controllable tolerance for therapy of AGC in the elderly.
    Anticancer research 02/2013; 33(2):697-704. · 1.71 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Background Tumor reduction by present-day prehepatectomy chemotherapy can render initially unresectable disease resectable. However, little is known about whether effects on liver metastases with attachment to or invasion of major intrahepatic vessels differ between chemotherapy regimens with or without monoclonal antibodies. We histologically compared relationships between liver tumors and major intrahepatic vessels after chemotherapy according to regimens used to treat colorectal liver metastasis. Methods In 38 patients who underwent chemotherapy and hepatectomy with pre-treatment images showing metastases attached to or invading major intrahepatic vessels, 62 metastases showed attachment to or invasion of 88 vessels. After resection, attachment, invasion, and separation were determined histopathologically in resected specimens. Results Thirteen patients received cytotoxic drug combinations alone, while 25 were treated with regimens including a monoclonal antibody (bevacizumab in 15 and cetuximab in 10). By imaging, 15.6% (5/32) of vessels in patients receiving cytotoxic drugs alone, 22.9% (8/35) of vessels in those also receiving bevacizumab, and 47.6% (10/21) of vessels in those also receiving cetuximab showed detachment after chemotherapy (P=0.015 for cetuximab vs. cytotoxic and P=0.039 for cetuximab vs. bevacizumab). Excluding 8 vessels not evaluated histologically, 23 of 31 vessels in the cytotoxic group remained invaded or attached, as did 16 of 29 in the bevacizumab group and 8 of 20 vessels in the cetuximab group (P=0.05 vs. cytotoxic). Conclusions Prehepatectomy chemotherapy regimens including monoclonal antibodies, particularly, anti-epidermal growth factor receptor antibodies, eradicated invasion or attachment between vessels and metastases more frequently. Individualized strategies for prehepatectomy chemotherapy based on intrahepatic location of metastases show promise.
    Surgery 01/2013; · 3.37 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: BACKGROUND: Although short- and long-term results have been described in previous reports of 2-stage hepatectomy, growth activity in metastases resected at the first versus second hepatectomy has not been compared. METHODS: We analyzed growth activity of liver metastases from colorectal cancers resected at first and second hepatectomy by real-time reverse-transcription polymerase chain reaction and immunohistochemistry in 21 patients undergoing 2-stage hepatectomy to justify the 2-stage approach. RESULTS: Of 24 patients planned to undergo 2-stage hepatectomy for colorectal liver metastases, 21 had completion of both stages. Although maximum tumor size and serum carcinoembryonic antigen before and after the first procedure did not differ, volume of the future liver remnant increased after the first procedure. Ki67 and proliferating cell nuclear antigen positivity rates were comparable between initially and subsequently resected tumors (P = .09 and P = .83, respectively). Expression of mRNA (relative to glyceraldehyde-3-phosphate dehydrogenase mRNA) in initially versus subsequently resected tumors for cyclin D1 (4.27 ± 1.29 vs 6.52 ± 2.23; P = .90), cyclin E1 (24.18 ± 16.81 vs 10.53 ± 2.28; P = .60), hepatocyte growth factor (3.16 ± 1.42 vs 0.58 ± 0.15; P = .11), basic fibroblast growth factor (5.42 ± 1.54 vs 5.92 ± 3.33; P = .13), epidermal growth factor (19.56 ± 14.76 vs 9.07 ± 4.54; P = .74), and transforming growth factor-α (2.63 ± 1.02 vs 2.07 ± 1.15; P = .29) showed no differences between the 2 time points. CONCLUSION: Two-stage hepatectomy did not seem to induce tumor growth activity or growth factor expression. The 2-stage strategy in combination with effective preoperative chemotherapy is a valuable strategy for colorectal metastases.
    Surgery 08/2012; · 3.37 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Laparoscopic colectomy for colorectal cancer has become established as a minimally invasive surgical approach. However, many disposable instruments are required, and there is an associated disadvantage of cost. We have developed a new technique, which uses a suture string to lift up the colon. This method is expected to reduce the number of access ports required without compromising the radical cure. OPERATIVE PROCEDURE: A suture string piercing the abdominal wall is passed through the mesocolon. The colon is retracted anteriorly and is fixed at the abdominal wall. The main mesenteric vessels are under tension, and lymph node dissection is performed easily by a medial approach. The working space is more stable because the colon is fixed to the abdominal wall. This study examined the short-term and long-term surgical outcomes of laparoscopic resection for colorectal cancer using our colon lifting-up technique (CLT), compared with the standard multiport technique. The study design was a case-matched control by propensity scoring. Analyzed variables were sex, age, American Society of Anesthesiologists score, cancer in a different organ, multiple colorectal cancer, operator, operative year, tumor location, operative procedure, adjuvant chemotherapy, and International Union Against Cancer TNM stage. From 2000 to 2010, 301 patients underwent CLT and 436 standard multiport technique, 148 patients were matched by propensity score and analyzed. Regarding short-term outcomes, there was no difference between the 2 groups. The mean number of ports needed was 3.37±0.48 for CLT (93 with 3 ports, 55 with 4). There were no differences in recurrence-free survival and overall survival in long-term follow-up results for each stage. There were neither recurrences nor complications due to CLT. The CLT facilitated laparoscopic colectomy without compromising cure rates. It is a useful method to keep a stable view and to conserve medical resources.
    Surgical laparoscopy, endoscopy & percutaneous techniques 02/2012; 22(1):38-45. · 0.88 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Single-incision laparoscopic surgery (SILS) has been used for colorectal cancer as a minimally invasive procedure. However, there are still difficulties concerning effective triangulation and countertraction. The study's purpose was to clarify the usefulness of the colon-lifting technique (CLT) in SILS for colorectal cancer. SILS was performed for cancer (cT2N0 or less) of the right-sided colon (near the ileocecum), sigmoid, or rectosigmoid. The SILS™ Port was used for transumbilical access. A suture string was inserted through the abdominal wall and passed through the mesocolon. The colon was retracted anteriorly and fixed to the abdominal wall. The main mesenteric vessels were placed under tension. Lymph node dissection was performed by medial approach. Short-term surgical outcomes and access port costs were compared between SILS (using CLT) and the standard multiport technique (MPT). The two groups were case-matched by propensity scoring. Analyzed variables included preoperative Dukes stage and tumor location. From June 2009 to April 2011, 27 patients underwent SILS, and from April 2005 to April 2011, 85 patients underwent MPT. Propensity scoring generated 23 matched patients per group for SILS versus MPT comparisons. There were no significant differences in operating time, blood loss, early complications, postoperative analgesic frequency, or length of hospital stay. One MPT patient was converted to open surgery (4.5%); no SILS patients were converted. There were no significant differences in the length of distal cut margin and the number of harvested lymph nodes, except incision length (SILS vs. MPT: 33 vs. 55 mm, P < 0.001). Significant differences favored SILS in access instrument cost (SILS vs. MPT: 62,761 vs. 77,130 Japanese yen, P < 0.001). SILS performed using CLT was safe and effective in providing radical treatment of cT2N0 cancer in the right-sided colon, sigmoid, or rectosigmoid. SILS was advantageous with respect to cosmesis and lower cost of access instruments.
    Surgical Endoscopy 11/2011; 26(5):1403-11. · 3.43 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: To evaluate the validity of surgical therapy for isolated hepatic and pulmonary colorectal metastases. Among 256 patients with liver resection for colorectal cancer metastases, 31 patients underwent resection for lung metastases synchronously or following liver resection. Twenty-nine patients (93.5%) underwent pulmonary resection for lung metastases after hepatectomy. Two patients (6.5%) with synchronously identified liver and lung metastases underwent staged liver and lung resection. The 5-, and 10-year overall survival rates were 77.5% and 39.5% after the initial liver resection and were 44.7% and 38.2% after the pulmonary resection, respectively. By multivariate analysis, the presence of three or more pulmonary metastases (risk ratio=3.692, 95% confidence interval C I=1.039-13.118, p=0.043) was an independent adverse prognostic factor. Surgical resection for both hepatic and pulmonary metastases from colorectal cancer appears feasible and efficacious in patients with <3 pulmonary metastases.
    Anticancer research 03/2011; 31(3):1049-54. · 1.71 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: This study evaluates the clinical characteristics of rectal cancer involving the anal canal. A total of 346 consecutive patients with primary low rectal cancer located below the peritoneal reflection were reviewed in this study. Patients were divided into two groups according to whether the lower edge of the tumor came in contact with the anal canal (P group, n = 78) or not (Rb group, n = 268). Clinical and pathological parameters, recurrence rates, and survival rates were compared between the two groups. The occurrence of uncommon histological types of tumor was significantly higher in the P group than in the Rb group. P group patients also had a significantly higher lateral pelvic node metastasis rate (p < 0.001), lower 5-year overall survival rate (p = 0.0491), and higher 5-year local recurrence rate (p = 0.0171) than Rb group patients. Multivariate analysis revealed that tumor location was a significant risk factor for local recurrence. In the P group, multivariate analysis showed that uncommon histological tumor types were a significant prognostic factor. Rectal cancer involving the anal canal should be treated with special care, considering the particularly high lateral pelvic lymph node metastasis rate and high local recurrence rate.
    Journal of Gastrointestinal Surgery 11/2010; 15(3):460-5. · 2.36 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: A multicenter randomized study is high quality, but it is also true that there are differences between institutions. The quality of treatment is consistent in a single center so comparisons in a retrospective study can be matched for many variables. This single-center study examined short-term and long-term outcomes for colorectal cancer in 258 patients who underwent laparoscopic resection (LC) and 258 matched open resection (OC) cases. The health-related qualities of life (HRQOL) at 1-2 years after the operations in 62 patients (35 LC and 27 OC) were compared by SF-36. The conversion rate was 5.0%. Mean follow-up periods in LC and OC were 62.3 and 62.1 months, respectively. Operation time was longer in LC than in OC, although the difference was not significant in the later period. Bleeding and postoperative stay were reduced in LC. The morbidity rate was 18.6% in LC and 26.4% in OC. The 5-year overall survival in LC and OC were 94.6% vs. 92.0% for stage I, 95.2% vs. 91.8% for stage II, and 80.9% vs. 79.1% for stage III, respectively. The corresponding 5-year disease-free survival were 94.0% vs. 88.4%, 92.1% vs. 84.0%, and 64.3% vs. 65.4%, respectively. Recurrence rates did not differ between groups. In the analysis of HRQOL scores, role physical, bodily pain, social functioning, role emotional, and physical component summary scores in LC were better than in OC. In LC for colorectal cancer, short-term outcomes except operation time and mid-term HRQOL were better than in OC, and there were no adverse effects relating to long-term outcomes.
    International Journal of Colorectal Disease 11/2010; 25(11):1311-23. · 2.24 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The purpose of this study was to determine the efficacy of hepatic artery infusion (HAI) plus systemic chemotherapy (SYS) as the prehepatectomy chemotherapy for liver metastases from colorectal cancer. Clinicopathologic data were available for 117 patients who were treated with chemotherapy before liver surgery. Response rate of chemotherapy and frequency of liver resection after chemotherapy of patients treated with HAI/SYS (n=26; 65% and 96%, respectively) were higher than those treated with HAI alone (n=63; 41% and 70%) or SYS alone (n=28; 25% and 42%). Histological examination of adjacent nonneoplastic liver confirmed that severe sinusoidal dilatation was less frequent in HAI/SYS group than in SYS group, and moderate to severe steatosis was also less frequent in HAI/SYS group as compared to HAI group. The combination of regional HAI and systemic chemotherapy is an effective prehepatectomy regimen for the treatment of patients with aggressive liver metastases from colorectal cancer.
    Gan to kagaku ryoho. Cancer & chemotherapy 11/2010; 37(12):2267-70.
  • Surgical Endoscopy 07/2010; · 3.43 Impact Factor