Development of predictive score for postoperative dysphagia after emergency abdominal surgery in patients of advanced age.

Aim: Postoperative dysphagia after emergency abdominal surgery (EAS) in patients of advanced age has become problematic, and appropriate dysphagia management is needed. This study was performed to identify predictive factors of dysphagia after EAS and to explore the usefulness of swallowing screening tools (SSTs). Methods: This retrospective study included 267 patients of advanced age who underwent EAS from 2012 to 2022. They were assigned to a dysphagia group and non-dysphagia group using the Food Intake Level Scale (FILS) (dysphagia was defined as a FILS level of <7 on postoperative day 10). From 2018, original SSTs including a modified water swallowing test were performed by nurses. Results: The incidence of postoperative dysphagia was 22.8% (61/267). Patients were significantly older in the dysphagia than non-dysphagia group. The proportions of patients who had poor nutrition, cerebrovascular disorder, Parkinson's disease, dementia, nursing-care service, high intramuscular adipose tissue content (IMAC), and postoperative ventilator management were much higher in the dysphagia than non-dysphagia group. Using logistic regression analysis, high IMAC, postoperative ventilator management, cerebrovascular disorder, and dementia were correlated with postoperative dysphagia and were assigned 10, 4, 3, and 3 points, respectively, according to each odds ratio. The optimal cut-off value was 7 according to a receiver operating characteristics curve. Using 1:1 propensity score matching for high-risk patients, the incidence of postoperative dysphagia was reduced by SSTs. Conclusions: The new prediction score obtained from this study can identify older patients at high risk for dysphagia after EAS, and SSTs may improve these patients' short-term outcomes.

Textbook outcome in the laparoscopic cholecystectomy of acute cholecystitis.

PURPOSE: Textbook outcome (TO) is a novel composite measure of clinical outcomes that can be used to measure the quality of surgical outcomes. The aim of this cohort study was to propose TO criteria for laparoscopic cholecystectomy for acute cholecystitis and to identify reasons for TO failure and individual patient factors that predispose to failure. METHODS: We retrospectively analyzed data for 189 patients with acute cholecystitis who underwent laparoscopic cholecystectomy. TO was defined as laparoscopic cholecystectomy without conversion to open cholecystectomy, intraoperative complications, postoperative complications (Clavien-Dindo classification ≥2), prolonged length of stay (≥10 days), readmission within 30 days, or mortality. RESULTS: TO was achieved in 154 of 189 patients who underwent laparoscopic cholecystectomy for acute cholecystitis. Medical costs were lower in the TO-achieved group than in the TO-failure group. Factors associated with TO failure on multivariate analysis were age > 70 years, hemoglobin <11.9 g/dL, and white blood cells >18 000 / µL (all P < .05). CONCLUSIONS: Applying TO to patients with acute cholecystitis allowed us to evaluate the overall quality of care related to hospitalization. TO may provide better assessment of the quality of care and help determine the treatment choice and reduce costs.

Safety of laparoscopic cholecystectomy in patients with a cerebrospinal fluid shunt in the peritoneal cavity.

INTRODUCTION: The management of patients with a cerebrospinal fluid (CSF) shunt located in the peritoneal cavity undergoing laparoscopic surgery is an issue that has not yet been settled. These patients are at risk of increased intracranial pressure caused by peritoneal insufflation, shunt dysfunction, and shunt infection/retrograde meningitis. This study aimed to determine the need for perioperative shunt intervention in CSF shunt patients undergoing laparoscopic cholecystectomy. METHODS: We reviewed and analyzed five shunt patients who underwent laparoscopic cholecystectomy in our institution between 2012 and 2022, as well as 17 patients described in previous reports. RESULTS: Among the 22 patients, shunt type was ventriculoperitoneal in 14 and lumboperitoneal in eight. The most common indication for CSF shunt was hydrocephalus caused by cerebral vascular accident (50.0%). Laparoscopic cholecystectomy was performed for cholecystolithiasis in 13 patients (59.1%), acute cholecystitis in eight (36.4%), and gallbladder polyp in one (4.5%). Shunt clamping or externalization was performed in six patients. Two patients in the group that did not undergo shunt clamping or externalization experienced complications (intra abdominal abscess and subcutaneous emphysema). However, the incidence of short-term complications (both overall and shunt-related) and median length of hospital stay did not significantly differ between the two groups. CONCLUSION: Routine shunt clamping, externalization, or removal might not be necessarily required in patients with a ventriculoperitoneal or lumboperitoneal shunt undergoing laparoscopic cholecystectomy.

Successful laparoscopic cholecystectomy for gallbladder hemorrhage from a Dieulafoy lesion in a patient on hemodialysis: a case report.

BACKGROUND: Patients on long-term dialysis are prone to hemorrhagic complications, particularly uremic bleeding, but gallbladder hemorrhage is rare, even in patients on dialysis. There have been occasional reports of a Dieulafoy lesion being a cause of gastrointestinal hemorrhage, but its occurrence within the gallbladder is quite rare. This report describes a case of gallbladder hemorrhage from a Dieulafoy lesion in a patient on hemodialysis that was diagnosed early and successfully treated by laparoscopic cholecystectomy. CASE PRESENTATION: The patient was a 68-year-old woman on long-term hemodialysis with end-stage renal failure who presented with epigastralgia and back pain. There was no history of trauma or oral administration of antiplatelet or anticoagulant agents. There were no signs of an inflammatory reaction or hyperbilirubinemia. Contrast-enhanced computed tomography revealed a slightly hyperdense area in the distended gallbladder and extravasation within the gallbladder lumen but no gallstones. A severe atherosclerotic lesion was also found. She was diagnosed to have gallbladder hemorrhage and emergency laparoscopic cholecystectomy was performed. Although the postoperative course was complicated by drug fever, she was discharged on postoperative day 10 in a satisfactory condition. Histology revealed hemorrhagic ulceration with an exposed blood vessel accompanied by abnormal arteries in the submucosa. Arteriosclerosis with eccentric intimal hyperplasia in a small-sized artery was also seen. The diagnosis was gallbladder hemorrhage from a Dieulafoy lesion. CONCLUSIONS: A Dieulafoy lesion should be kept in mind as a cause of gallbladder hemorrhage in a patient with severe arteriosclerosis and a bleeding diathesis, particularly if on dialysis, and treated as early as possible.

Prognostic Impact of the Preoperative Systemic Inflammation Score in Patients With Pancreatic Ductal Adenocarcinoma.

BACKGROUD: The systemic inflammation score (SIS), which is based on the preoperative lymphocyte-to-monocyte ratio (LMR) and serum albumin (Alb) level, is a prognostic indicator for several cancer types. However, the prognostic significance of the SIS in pancreatic ductal adenocarcinoma (PDAC) remains unknown. METHODS: Seventy-eight patients who underwent radical surgery for PDAC were categorized as follows: SIS 0 (LMR ≥3.51 and Alb ≥4.0 g/dl), n = 26; SIS 1 (LMR <3.51 or Alb <4.0 g/dl), n = 29 and SIS 2 (LMR <3.51 and Alb <4.0 g/dl), n=23. RESULTS: The tumour size sequentially increased in SIS 0, 1 and 2 groups. A higher SIS was associated with increased vascular invasion, perineural invasion and surgical margin positivity rate. Recurrence-free survival (RFS) rates between the SIS 1 and 2 groups showed no significant difference However, patients of the SIS 1 and 2 groups had poorer outcomes than those of the SIS 0 group for RFS. Overall survival (OS) rates between the SIS 1 and 2 groups also showed no significant difference. However, patients of the SIS 1 and 2 groups had poorer outcomes than those of the SIS 0 group for OS. The SIS was an independent prognostic factor for RFS and OS. DISCUSSION: The SIS is a simplified prognostic factor for patients with PDAC.

Prognostic Impact of Lymphocyte-to-C-Reactive Protein Ratio in Patients Who Underwent Surgical Resection for Pancreatic Cancer.

BACKGROUND: Increasing evidence indicates that increased systemic inflammation is correlated with poorer cancer-specific survival in various cancer types. This study aimed to evaluate the prognostic value of various combinations of inflammatory factors in patients who underwent surgical resection for pancreatic cancer (PC). METHODS: We retrospectively analyzed 97 consecutive patients with PC who underwent pancreatectomy. We assessed the predictive impact for recurrence using a combination of 5 inflammatory markers and focused on the lymphocyte-C-reactive protein ratio (LCR) to elucidate its prognostic and predictive value for recurrence-free survival (RFS) and overall survival (OS) in univariate and multivariate analyses using the Cox proportional hazards model. RESULTS: Low preoperative LCR was correlated with low serum hemoglobin, low serum albumin concentration, high frequency of microscopic vascular invasion, and high frequency of microscopic perineural invasion. The low LCR group had significantly worse RFS and OS. Lower preoperative LCR was an independent predictor of shorter RFS and OS in this cohort. DISCUSSION: Preoperative LCR is a novel and convenient prognostic marker for patients with PC. Patients with low LCR may require more favorable intensive therapy.

Delayed laparoscopic cholecystectomy for a patient with coronavirus disease 2019 who developed gangrenous cholecystitis: a case report.

BACKGROUND: Gangrenous cholecystitis has a high risk of perforation and sepsis; therefore, cholecystectomy in the early stage of the disease is recommended. However, during the novel coronavirus disease 2019 (COVID-19) pandemic, the management of emergent surgeries changed to avoid contagion exposure among medical workers and poor postoperative outcomes. CASE PRESENTATION: A 56-year-old man presented to our hospital with abdominal pain. Computed tomography revealed intraluminal membranes, an irregular or absent wall, and an abscess of the gallbladder, indicating acute gangrenous cholecystitis. Early laparoscopic cholecystectomy seemed to be indicated; however, a COVID-19 antigen test was positive despite no obvious pneumonia on chest computed tomography and no symptoms. After discussion among the multidisciplinary team, antibiotic therapy was started and percutaneous transhepatic gallbladder drainage (PTGBD) was planned for the following day because the patient's vital signs were stable and his abdominal pain was localized. Fortunately, the antibiotic therapy was very effective, and PTGBD was not needed. The cholecystitis improved and the patient was discharged from the hospital on day 10. One month later, laparoscopic delayed cholecystectomy was performed after confirming a negative COVID-19 polymerase chain reaction test result. The postoperative course was uneventful, and the patient was discharged on postoperative day 2 in satisfactory condition. CONCLUSION: We have reported a case of acute gangrenous cholecystitis in a patient with asymptomatic COVID-19 disease. This report can help to determine treatment strategies for patients with gangrenous cholecystitis during future pandemics.

A case of successful conversion surgery for locally advanced pancreatic cancer with synchronous triple cancer of the lung and esophagus: a case report.

BACKGROUND: The number of reports of multiple primary cancer (MPC) is increasing because of the advancement in diagnostic imaging technology. However, the treatment strategy for MPCs involving pancreatic cancer is controversial because of the extremely poor prognosis. We herein report a patient with synchronous triple cancer involving the pancreas, esophagus, and lung who underwent conversion surgery after intensive chemotherapy for unresectable locally advanced pancreatic cancer. CASE PRESENTATION: A 59-year-old man was admitted to our hospital with epigastric pain, anorexia, and weight loss. Computed tomography and upper gastrointestinal endoscopy revealed that the patient had synchronous triple cancer of the pancreas, esophagus, and lung. While the esophageal and lung cancer were relatively non-progressive, the pancreatic tail cancer had invaded the aorta, celiac axis, and left kidney, and the patient was diagnosed with unresectable locally advanced disease. Because the described lesion could have been the prognostic determinant for this patient, we initiated intensive chemotherapy (gemcitabine plus nab-paclitaxel) for pancreatic cancer. After six courses of chemotherapy, the tumor size shrank remarkably and no invasion to the aorta or celiac axis was observed. No significant changes were observed in the esophageal and lung cancers; endoscopic submucosal dissection could be still a curative treatment for the esophageal cancer. Therefore, we performed curative resection for pancreatic cancer (distal pancreatomy, splenectomy, and left nephrectomy; ypT3N0cM0, ypStage IIA, UICC 8th). Pathologically, complete resection was achieved. The patient then underwent endoscopic submucosal dissection for early esophageal cancer (pT1a[M]-LPM) and video-assisted thoracoscopic right upper lobectomy in combination with right lower partial resection for early lung cancer (pT2aN0M0, pStage IB, UICC 8th). Eight months after pancreatic cancer surgery, the patient is alive and has no sign of recurrence; as a result of the successful treatment, the patient has a good quality of life. CONCLUSIONS: Treatment of MPC is challenging, especially for cases with unresectable tumors. Although synchronous triple cancer can involve unresectable pancreatic cancer, radical resection may be possible after careful assessment of the appropriate treatment strategy and downstaging of unresectable tumors.

Indocyanine green fluorescence to ensure perfusion in middle segment-preserving pancreatectomy: a case report.

BACKGROUND: Middle segment-preserving pancreatectomy (MSPP) is an alternative to total pancreatectomy that allows for the preservation of the endocrine and exocrine functions of the pancreas. However, maintaining perfusion to the pancreatic remnant is of critical importance. We describe the first case to our knowledge in which indocyanine green (ICG) fluorescence was used to confirm perfusion to the pancreatic remnant during MSPP. CASE PRESENTATION: A 79-year-old man with diabetes mellitus was referred to our hospital for treatment of a pancreatic tumor. Computed tomography revealed a hypovascular mass in the uncus of the pancreas and dilatation of the main pancreatic duct, measuring 13 mm in the tail of the pancreas. He was diagnosed with cancer of the pancreatic uncus via endoscopic ultrasound and fine-needle aspiration revealed a mixed-type intraductal papillary mucinous neoplasm (IPMN), along with high-risk stigmata in the tail of the pancreas. We performed MSPP and the length of the pancreatic remnant was 4.6 cm. The dorsal pancreatic artery was preserved and perfusion to the pancreatic remnant was confirmed by ICG fluorescence. Histopathological examination showed a pancreatic ductal adenocarcinoma in the uncus (pT1cN1M0, pStage 2B) and IPMN in the tail of the pancreas. The postoperative course was complicated by a grade B pancreatic fistula, but this was successfully treated with conservative management. The patient was transferred to a hospital 33 days after surgery. Insulin administration was necessary, but C-peptide was detectable and blood glucose was relatively well-controlled. He did not exhibit any exocrine dysfunction when pancreatic enzyme supplementation was administered. CONCLUSION: ICG fluorescence can be used to evaluate perfusion to the pancreatic remnant during MSPP.

Impact of a 7.5-Fr Pancreatic Stent for Preventing Pancreatic Fistula after Pancreaticoduodenectomy.

INTRODUCTION: Pancreatic duct stents are widely used to reduce the incidence of postoperative pancreatic fistula (POPF) after pancreaticoduodenectomy (PD); however, small stents may cause adverse effects, such as occlusion. Recently, we have tried placing a 7.5-Fr pancreatic duct stent to achieve more effective exocrine output from the pancreas; however, the association between pancreatic duct stent size and POPF remains unknown. METHODS: Sixty-five patients with soft pancreatic texture who underwent PD were retrospectively analyzed. After dividing the pancreas, a pancreatic duct stent (stent size 4.0 in 29 patients, 5.0 in 18, and 7.5 Fr in 18) was placed in the main pancreatic duct. RESULTS: Twenty-five of 65 patients with soft pancreatic texture (38.5%) developed POPF. POPF became less frequent as the pancreatic duct stent size increased (p = 0.003). The factors associated with POPF development were a 7.5-Fr pancreatic duct stent (p = 0.005), 5.0-Fr pancreatic duct stent (p = 0.031), and male sex (p = 0.008). Pancreatic duct stent size and pancreatic duct diameter did not differ between the POPF and non-POPF groups. DISCUSSION/CONCLUSIONS: In patients with a soft pancreas, the placement of a 7.5-Fr pancreatic duct stent may reduce the incidence of POPF.

Impact of Osteopenia on Oncologic Outcomes After Curative Resection for Pancreatic Cancer.

BACKGROUND/AIM: We evaluated the relationship between low bone mineral density (BMD), also called osteopenia, and prognosis in patients who underwent resection for pancreatic cancer (PC). PATIENTS AND METHODS: We enrolled 91 consecutive patients who underwent curative resections for PC between May 2009 and January 2019. Their BMDs were measured at the Th11 vertebra using computed tomography. Patients were then divided by age-adjusted standard BMD values into the osteopenia group (n=34) and the non-osteopenia group (n=57). Their overall survival (OS) and recurrence-free survival (RFS) were compared (log-rank test). RESULTS: The two groups did not differ in age, BMI, tumor marker, operation time, blood loss, postoperative complications or stage. The osteopenia group had significantly worse 3-year rates for OS (46% vs. 30%, p=0.04) and RFS (41% vs. 26%, p=0.01). In multivariate analysis, osteopenia was an independent prognostic factor for RFS (HR=2.16, p=0.01). CONCLUSION: Osteopenia is an adverse prognostic factor for patients with resected PC.

Refractory cutaneo-gastric conduit fistula after esophagectomy repaired by a pectoralis major muscle flap and split-thickness skin graft.

BACKGROUND: Gastric conduit ulcer after esophagectomy is not uncommon. In cases where a gastric conduit ulcer penetrates the adjacent organs, it is difficult to select a suitable treatment strategy. The treatment depends on the adjacent organs penetrated. CASE PRESENTATION: We report a case in which a reconstructed gastric conduit ulcer penetrated the precordial skin in a patient who had undergone esophagectomy due to spontaneous esophageal rupture 28 years previously. To treat the cutaneo-gastric conduit fistula, we resected the fistula, covered the site of anastomosis with a major pectoralis muscle flap, and applied a split-thickness skin graft to the skin defect. CONCLUSIONS: In cases of gastric conduit trouble in patients treated via the antesternal route, a major pectoralis muscle flap is useful because of its rich blood supply and easy mobilization. In addition, a split-thickness skin graft should be applied to the skin defect.

The short term feasibility of abdominoperineal resection with prostatectomy for locally advanced rectal cancer: open and laparoscopic cases report.

Total pelvic exenteration is often selected for advanced rectal cancer with prostatic invasion. The aim of this study was to evaluate the short term feasibility of the abdominoperineal resection with prostatectomy for locally advanced rectal cancer. We performed abdominoperineal resection with prostatectomy for 3 patients with locally advanced rectal cancer, including 2 patients by totally laparoscopic procedure. Patients' background, intra- and postoperative factors and short-term prognosis were evaluated. All patients underwent complete resection of primary tumor with negative surgical margins. We could perform the surgery by both open and laparoscopic procedure in collaboration with urologist. There was no operation related mortality. One patient who was treated by open procedure had urinary anastomotic leakage. No patient had recurrenced, but one patient died of other disease. Our experience suggests that open or laparoscopic abdominoperineal resection with prostatectomy could be an alternative to total pelvic exenteration for the patients with rectal cancer invading the prostate. The collaboration with the urologist would be important to perform quality-controlled surgery.

[A case successfully treated with abdominoperineal resection after preoperative chemoradiation therapy for anal cancer].

A 46-year-old female was diagnosed with anal squamous cell carcinoma. Chemoradiation therapy was administered for a first-line therapy. Two courses of enforced 5-FU/MMC combination therapy were administered along with radiotherapy (60 Gy). This chemoradiation therapy had complete response. However, three months after, anal cancer had a local recurrence. Since there was no distant metastasis, abdoninoperineal resection was performed. No complications were observed after the operation. We conclude that abdominoperineal resection may be effective in the treatment of anal cancer in cases which the local recurrence was observed after chemoradiation therapy.

[A case successfully treated with subtotal esophagectomy after preoperative second-line chemotherapy for cT4 esophageal cancer].

A 69-year-old male was diagnosed with type 2 advanced esophageal cancer in the upper and middle thoracic esophagus which invaded the left main bronchus and the aorta. Radio-chemotherapy was administered since a radical resection could not be performed due to the invasion. Two courses of enforced FP combination therapy (5-FU and CDDP) were administered along with radiotherapy. Although this radio-chemotherapy was effective to some degree in tumor reduction, a radical resection still could not be performed due to the invasion of the left main bronchus and the aorta. Thus, we administered four more courses of DCF combination therapy (docetaxel, CDDP and 5-FU). This chemotherapy reduced the esophageal cancer mass significantly, and subtotal esophagectomy was performed. No complications were observed after the operation. We conclude that DCF combination therapy may be effective in the treatment of esophageal cancer in cases which the desired effect cannot be achieved by FP combination therapy alone.

[A case of elderly advanced gastric cancer patient with multiple liver metastases effectively treated by hepatic arterial infusion chemotherapy].

An 85 years old man was performed systemic chemotherapy after the palliative gastrectomy for unresectable gastric cancer with multiple liver metastases. The response evaluation revealed a progressive disease after 4 courses of first-line S-1 therapy and 3 courses of second-line paclitaxel therapy. At this point, metastatic lesions were still localized in the liver, so hepatic arterial infusion chemotherapy (HAI) was introduced as third-line therapy. Despite the marked reduction of all target lesions and reduced tumor marker level after 25 weeks of HAI without any adverse event, novel multiple metastatic lesions had appeared in the lung and celiac LNs, resulted in the cessation of HAI. Then he had suffered grade 3 mucositis oral and anorexia throughout 2 courses of fourth-line S-1 + CDDP therapy and fifth-line docetaxel therapy. Considering that the goal of treatment for unresectable gastric cancer patients is to delay developing symptoms and to prolong their life with the least adverse event, HAI could be an effective therapy.

[A long-term survival after hepatectomy combined with hepatic arterial infusion chemotherapy for hepatic metastasis of colon cancer].

We report on a patient who presented in 2000 with multiple hepatic metastasis of sigmoid colon cancer. We chose the hepatic arterial infusion chemotherapy for this case since there was no effective chemotherapy at that time. After the intermittent chemotherapy for one and half years, we recognized that the tumor became smaller, though it couldn't cure completely. Therefore, two years after the first medical examination, we underwent a hepatic left lobectomy and S8 hepatectomy. No recurrence has been observed until now. As a recent treatment of the hepatic metastasis of colon cancer, there is a tendency to choose chemotherapy before operation. However, there are some cases in which chemotherapy isn't acceptable because of its side effect. Besides chemotherapy, we report another treatment (the hepatic arterial infusion chemotherapy) which has a similar effectiveness with fewer side effects for the hepatic metastasis of colon cancer.

Huge gastric carcinoma showing an exophytic growth pattern: a case report and review of the literature.

CASE REPORT: We herein report a case of huge gastric carcinoma showing an exophytic growth pattern. The gastric carcinoma measured 160 x 130 mm in size. A radical resection was judged to be impossible preoperatively since the tumor invasion of the pancreas and liver was demonstrated on computed tomography. A pancreaticoduodenectomy combined with a resection of the transverse colon was performed. A pathological examination demonstrated the tumor to directly invade the pancreas and transverse colon; however, no metastasis was observed in the regional lymph nodes. The patient is alive and doing well without any recurrence at 5 years postoperatively. DISCUSSION: To obtain a better prognosis for huge gastric carcinoma showing an exophytic growth pattern, extended radical surgery is recommended since the size of the exophytic mass sometimes does not indicate the extent of the tumor.

Prognostic significance of receptor-binding cancer antigen expressed on SiSo cells (RCAS1) expression in relation to cadherin expression in patients with colorectal carcinoma.

PURPOSE: This study was designed to assess the prognostic value of receptor-binding cancer antigen expressed on SiSo cells expression and its relationship with cadherin expression in patients with colorectal cancer. METHODS: The expressions of receptor-binding cancer antigen expressed on SiSo cells and E-cadherin were analyzed with special reference to prognosis in 105 patients with colorectal cancer. RESULTS: Receptor-binding cancer antigen expressed on SiSo cells immunoreactivity was detected in the membrane and cytoplasm of tumor cells and considered to be positive in 48 patients (45.7 percent). The expression of receptor-binding cancer antigen expressed on SiSo cells was significantly correlated with lymph node metastasis (P = 0.0004), venous invasion (P = 0.0062), Dukes stages (P < 0.0001), and serum levels of carcinoembryonic antigen (P = 0.014). Furthermore, receptor-binding cancer antigen expressed on SiSo cells expression was significantly correlated with a poor prognosis (P < 0.001), and multivariate analysis indicated that it was an independent prognostic indicator. The expression of receptor-binding cancer antigen expressed on SiSo cells was more frequently found in tumors with reduced or abnormal expression of E-cadherin. The survival time of patients with reduced/abnormal E-cadherin expression was significantly shorter than that of patients with normal E-cadherin expression among patients with receptor-binding cancer antigen expressed on SiSo cells expression (P = 0.0043) but did not differ for those without receptor-binding cancer antigen expressed on SiSo cells expression (P = 0.17). Furthermore, multivariate analysis revealed that reduced/abnormal expression of E-cadherin was an independent prognostic factor in patients with receptor-binding cancer antigen expressed on SiSo cells expression but not in those without receptor-binding cancer antigen expressed on SiSo cells expression. CONCLUSIONS: Receptor-binding cancer antigen expressed on SiSo cells expression is significantly correlated with tumor progression and poor prognosis in patients with colorectal cancer. Both reduced E-cadherin and enhanced receptor-binding cancer antigen expressed on SiSo cells expression may be critical for the mechanism of metastasis and recurrence in human colorectal cancer.