A case of squamous cell carcinoma of the breast achieved a pathological complete response after dose-dense AC + dose-dense PTX.

BACKGROUND: Squamous cell carcinoma (SCC) of the breast is a rare form of breast cancer, accounting for approximately 0.1% of all breast cancers. It is known for its rapid tumor growth and poor prognosis with no established treatment. CASE PRESENTATION: A 56-year-old woman was diagnosed with breast SCC with axillary, supraclavicular and internal thoracic lymph node metastases. She received neoadjuvant chemotherapy (NAC) with dose-dense doxorubicin and cyclophosphamide (AC) followed by dose-dense paclitaxel (PTX). This treatment resulted in a pathological complete response (pCR) after breast-conserving surgery. The patient was then treated with radiotherapy. She remained free of recurrence for three years postoperatively. CONCLUSIONS: We report a rare case of breast SCC treated with preoperative dose-dense chemotherapy, resulting in pCR and allowing breast-conserving surgery.

The use of an artificial intelligence algorithm for circulating tumor cell detection in patients with esophageal cancer.

Despite recent advances in multidisciplinary treatments of esophageal squamous cell carcinoma (ESCC), patients frequently suffer from distant metastasis after surgery. For numerous types of cancer, circulating tumor cells (CTCs) are considered predictors of distant metastasis, therapeutic response and prognosis. However, as more markers of cytopathological heterogeneity are discovered, the overall detection process for the expression of these markers in CTCs becomes increasingly complex and time consuming. In the present study, the use of a convolutional neural network (CNN)-based artificial intelligence (AI) for CTC detection was assessed using KYSE ESCC cell lines and blood samples from patients with ESCC. The AI algorithm distinguished KYSE cells from peripheral blood-derived mononuclear cells (PBMCs) from healthy volunteers, accompanied with epithelial cell adhesion molecule (EpCAM) and nuclear DAPI staining, with an accuracy of >99.8% when the AI was trained on the same KYSE cell line. In addition, AI trained on KYSE520 distinguished KYSE30 from PBMCs with an accuracy of 99.8%, despite the marked differences in EpCAM expression between the two KYSE cell lines. The average accuracy of distinguishing KYSE cells from PBMCs for the AI and four researchers was 100 and 91.8%, respectively (P=0.011). The average time to complete cell classification for 100 images by the AI and researchers was 0.74 and 630.4 sec, respectively (P=0.012). The average number of EpCAM-positive/DAPI-positive cells detected in blood samples by the AI was 44.5 over 10 patients with ESCC and 2.4 over 5 healthy volunteers (P=0.019). These results indicated that the CNN-based image processing algorithm for CTC detection provides a higher accuracy and shorter analysis time compared to humans, suggesting its applicability for clinical use in patients with ESCC. Moreover, the finding that AI accurately identified even EpCAM-negative KYSEs suggested that the AI algorithm may distinguish CTCs based on as yet unknown features, independent of known marker expression.

Repair using the pectoralis major musculocutaneous flap for refractory anastomotic leakage after total esophagectomy.

BACKGROUND: The pectoralis major musculocutaneous flap (PMMF) is a pedicled flap often used as a reconstruction option in head and neck surgery, especially in cases with poor wound healing. However, applying PMMF after esophageal surgery is uncommon. We report here, the case of a successfully repaired refractory anastomotic fistula (RF) after total esophagectomy, by PMMF. CASE PRESENTATION: A 73-year-old man had a history of hypopharyngolaryngectomy, cervical esophagectomy, and reconstruction using a free jejunal graft for hypopharyngeal carcinosarcoma at the age of 54. He also received conservative treatment for pharyngo-jejunal anastomotic leakage (AL), then postoperative radiation therapy. This time, he was diagnosed with carcinosarcoma in the upper thoracic esophagus; cT3rN0M0, cStageII, according to the Japanese Classification of Esophageal Cancer 12th Edition. As a salvage surgery, thoracoscopic total resection of the esophageal remnant and reconstruction using gastric tube via posterior mediastinal route was performed. The distal side of the jejunal graft was cut and re-anastomosed with the top of the gastric tube. An AL was observed on the 6th postoperative day (POD), and after 2 months of conservative treatment was then diagnosed as RF. The 3/4 circumference of the anterior wall of the gastric tube was ruptured for 6 cm in length, and surgical repair using PMMF was performed on POD71. The edge of the defect was exposed and the PMMF (10 × 5 cm) fed by thoracoacromial vessels was prepared. Then, the skin of the flap and the wedge of the leakage were hand sutured via double layers with the skin of the flap facing the intestinal lumen. Although a minor AL was observed on POD19, it healed with conservative treatment. No complications, such as stenosis, reflux, re-leakage, were observed over 3 years of postoperative follow-up. CONCLUSIONS: The PMMF is a useful option for repairing intractable AL after esophagectomy, especially in cases with large defect, as well as difficulties for microvascular anastomosis due to previous operation, radiation, or wound inflammation.

miR-877-3p as a Potential Tumour Suppressor of Oesophageal Squamous Cell Carcinoma.

BACKGROUND/AIM: MicroRNAs (miRNAs) are abnormally expressed and involved in the pathogenesis of various carcinomas. The present study aimed to identify novel miRNA genes associated with the pathogenesis and prognosis of oesophageal squamous cell carcinoma (ESCC). MATERIALS AND METHODS: The miRNA profiling of 873 genes was performed using surgically resected oesophageal tissues from 35 patients with ESCC to identify candidate miRNAs. To examine the biological activities of candidate miRNAs, their proliferative, invasive, and migratory abilities were evaluated in ESCC cells subjected to miRNA mimic-mediated over-expression. The miRNA expression levels of the selected candidate miRNAs were analysed in the resected oesophageal tissues of 76 patients with ESCC from the two cohorts and correlated with the clinicopathological parameters. RESULTS: Among the four candidate miRNAs identified by miRNA profiling, miR-877-3p was selected for subsequent analyses. In vitro analyses showed that the over-expression of miR-877-3p significantly suppressed the proliferation, invasion, and migration of ESCC cell lines compared with those of control cells. In the analyses of clinical specimens, the expression of miR-877-3p was down-regulated in ESCC tissues compared with that in adjacent normal oesophageal tissues. The down-regulation of miR-877-3p expression in ESCC tissues was significantly associated with advanced local progression and lymphatic involvement. The miR-877-3p down-regulation was also significantly associated with poor disease-free and disease-specific survival. CONCLUSION: miR-877-3p acts as a tumour suppressor gene in ESCC cells, and its down-regulation in ESCC tissues is associated with a poor prognosis. Thus, miR-877-3p may serve as a novel prognostic marker and promising therapeutic target.

Paratracheal air cyst and bronchogenic cyst in patients with esophageal cancer who received thoracoscopic esophagectomy: A case series of three patients.

INTRODUCTION AND IMPORTANCE: Mediastinal cystic lesions, such as paratracheal air cyst (PTAC) and bronchogenic cyst (BC), are rare anomaly usually found incidentally in thoracic imaging. Special attention is needed in the case of thoracic surgery. CASE PRESENTATION: All three patients were male, 71, 73, and 76 years old. Preoperative CT showed each had a lobular cystic lesion at the right posterolateral side of trachea in the thoracic outlet 11, 14, and 19 mm in size, respectively, with air density and tracheal communication, leading to a diagnosis of PTACs. An oval cystic lesion, 7 mm in size, was found in one patient at the right lateral side of the upper esophagus with low density and without tracheal communication, leading to a diagnosis of paraesophageal BC. Intraoperative findings of the three PTACs demonstrated a soft bulge from the membranous portion of trachea that was left intact. The BC had an oval elastic structure, mimicking a metastatic lymph node, and was removed with the mediastinal lymph nodes. Histological examination showed ciliated columnar epithelium, confirming a diagnosis of BC. CLINICAL DISCUSSION: PTACs are associated with increased intraluminal pressure due to chronic lung disease. BCs are congenital anomalies that originate from abnormal budding of the embryonic foregut. CONCLUSION: PTACs and BCs need to be considered in preoperative image diagnosis in patients with esophageal cancer. PTACs should be left intact to avoid tracheal injury, while removal of isolated BCs is recommended as a diagnostic and therapeutic measure.

Immediate one-stage breast reconstruction for an 85-year-old breast cancer patient using deep inferior epigastric perforator flap surgery.

The deep inferior epigastric perforator (DIEP) flap is widely recognized as safe for use as a first-choice option in autologous tissue breast reconstruction; however, DIEP is often not performed for breast reconstruction in the elderly. We report a case of an 85-year-old woman who underwent DIEP flap reconstruction. Immediate reconstruction was performed after mastectomy. The patient successfully underwent DIEP flap reconstruction with no complications. Other options for reconstruction include a latissimus dorsi flap, a transverse rectus abdominis flap and implant-based reconstruction. DIEP flap reconstruction was performed, which does not cause muscle damage and provides sufficient volume. To our knowledge, this study is the first to report DIEP breast reconstruction in a patient over 85 years of age. This case demonstrates the usefulness of DIEP flap reconstruction for elderly patients.

Distal partial gastrectomy for gastric tube cancer with intraoperative blood flow evaluation using indocyanine green fluorescence.

With recent advances in the treatment of esophageal cancer and long-term survival after esophagectomy, the number of gastric tube cancer (GTC) has been increasing. Total gastric tube resection with lymph node dissection is considered to be a radical treatment, but it causes high post-operative morbidity and mortality. We report an elderly patient with co-morbidities who developed pyloric obstruction due to GTC after esophagectomy with retrosternal reconstruction. The patient was treated using distal partial gastric tube resection (PGTR) and Roux-en-Y reconstruction with preservation of the right gastroepiploic artery and right gastric artery. Intraoperative blood flow visualization using indocyanine green (ICG) fluorescence demonstrated an irregular demarcation line at the distal side of the preserved gastric tube, indicating a safe surgical margin to completely remove the ischemic area. PGTR with intraoperative ICG evaluation of blood supply in the preserved gastric tube is a safe and less-invasive surgical option in patients with poor physiological condition.

Early ambulation after general and digestive surgery: a retrospective single-center study.

PURPOSE: Postoperative early ambulation contributes to the improvement of postoperative outcomes; however, the definition of "early" ambulation is unclear. In this study, we aimed to define desirable "early" ambulation after digestive surgery in terms of short-term outcomes and to identify the risk factors for delayed ambulation. METHODS: We retrospectively analyzed 718 patients who underwent major digestive surgery between January 2016 and May 2019 in our hospital. The timing of first ambulation after surgery was reviewed and correlated with short-term postoperative outcomes and perioperative patient characteristics. RESULTS: Of 718 patients, 55% underwent first ambulation at postoperative day (POD) 1, 31% at POD 2, and the remaining patients at POD 3 or later. Whereas short-term outcomes were equivalent among patients with first ambulation at POD 1 and those at POD 2, patients who delayed ambulation until POD 3 or after had an increased incidence of infectious complications (P = 0.004), longer hospitalization (P < 0.001), and a decreased home discharge rate (P < 0.001). Multivariate analysis showed that significant predictors of delayed ambulation (POD ≥ 3) were poor Eastern Cooperative Oncology Group performance status (ECOG-PS), low controlling nutritional status (CONUT), nonlaparoscopic surgery, and transvenous opioid use. Of these factors, the combination of ECOG-PS, CONUT, and nonlaparoscopic surgery clearly stratified patients into four-grade risk groups regarding delayed ambulation (P for trend < 0.001). CONCLUSION: Our results suggest that first ambulation before POD 2 could be desirable for better short-term outcomes. Active preoperative intervention, such as nutritional care and prehabilitation, in patients with multiple risk factors for delayed ambulation could improve the postoperative course.

Metachronous rupture of a residual pancreaticoduodenal aneurysm after release of the median arcuate ligament: a case report.

BACKGROUND: Multiple pancreaticoduodenal artery aneurysms in association with median arcuate ligament syndrome (MALS) are relatively rare. A treatment option, such as a median arcuate ligament (MAL) release or embolization of the aneurysms, should be considered in such cases, but the treatment criteria remain unclear. CASE REPORT: A 75-year-old man was transferred to our hospital because of a ruptured pancreaticoduodenal aneurysm. Emergency angiography showed stenosis of the root of the celiac axis (CA), a ruptured aneurysm of the posterior inferior pancreaticoduodenal artery (PIPDA), and an unruptured aneurysm of the anterior inferior pancreaticoduodenal artery (AIPDA). Coil embolization of the PIPDA was performed. Five days after embolization, the gallbladder became necrotic due to decreased blood flow in the CA region, and an emergency operation was performed. We performed a cholecystectomy and released the MAL to normalize the blood flow of the CA region. However, the patient died on postoperative day 8 because of rupture of the untreated aneurysm of the AIPDA. CONCLUSIONS: This is the first report of metachronous ruptures of multiple pancreaticoduodenal aneurysms due to MALS, even after a MAL release. Although rare, a residual aneurysm in the pancreatic head region may need to be embolized quickly.

Risk factors for postoperative pneumonia after general and digestive surgery: a retrospective single-center study.

PURPOSE: Pneumonia is the second-most common complication in postoperative patients and is associated with significant morbidity and high costs of care. We aimed to determine the risk factors for pneumonia after general and digestive surgery. METHODS: The medical records of 1,016 patients who underwent general and digestive surgery between January 2016 and March 2019 in our hospital were reviewed. RESULTS: Of the 1,016 patients, 67 (6.6%) developed postoperative pneumonia. The multivariate analysis showed that significant predictors of postoperative pneumonia were a poor Eastern Cooperative Oncology Group performance status (ECOG-PS), low forced vital capacity and low forced expiratory volume in one second in the spirometry test, malnutrition (low serum albumin levels and low controlling nutritional status scores and prognostic nutritional index [PNI] values), esophagectomy, upper gastrointestinal surgery, and nonlaparoscopic surgery. Of these factors, the combination of PNI and ECOG-PS clearly stratified patients into low-, intermediate-, and high-risk groups with respect to developing postoperative pneumonia (area under the curve: 0.709). CONCLUSIONS: Although postoperative pneumonia is associated with many clinical variables, active medical intervention for the prevention of pneumonia in patients with multiple risk factors can improve the postoperative course. In particular, perioperative nutritional care may prevent postoperative pneumonia in patients with malnutrition and a poor PS.

Mediastinoscopic salvage esophagectomy for recurrent esophageal squamous cell carcinoma after definitive chemoradiotherapy in a previously pneumonectomized patient.

We herein report a case of mediastinoscopic salvage esophagectomy for recurrent esophageal squamous cell carcinoma after definitive chemoradiotherapy in a previously pneumonectomized patient. A 66-year-old man with a medical history of left-sided pneumonectomy for lung cancer was diagnosed with local recurrence of lower esophageal squamous cell carcinoma (cT3N0M0 cStage II) 9 years after definitive chemoradiotherapy. The mediastinoscopic cervical approach and laparoscopic transhiatal approach were combined, and the thoracic esophagus was safely mobilized to separate the esophagus from the stump of the left bronchus and to divide dense adhesions between the esophagus and fibrotic tissue at the site of the previous left mediastinal pleural resection. The esophagectomy was uneventful and followed by reconstruction with a gastric conduit via the retrosternal route. The pathological diagnosis was esophageal squamous cell carcinoma (pT3-AD, pN1, M0, pStage III), indicating R0 resection. Even as salvage surgery, mediastinoscopic esophagectomy is a safe and curative treatment strategy for esophageal cancer patients who have previously undergone pneumonectomy.

Multiple Synchronous Sporadic Gastrointestinal Stromal Tumors in the Stomach and Jejunum.

A 77-year-old patient was admitted to our hospital for the further examination of melena. A computed tomography scan detected two submucosal tumors (SMTs) in the stomach and jejunum. Double-balloon endoscopy revealed the presence of a delle on the jejunal SMT, suggesting that the SMT was the origin of the gastrointestinal bleeding. Both tumors were surgically resected and subsequently diagnosed via histology as gastrointestinal stromal tumors (GISTs). Furthermore, the two GISTs had different mutations in the c-kit gene, suggesting that they were derived from different clonal origins. This report depicts an extremely rare case of multiple synchronous sporadic GISTs in the stomach and jejunum.

The efficacy of steroids for postoperative persistent inflammatory reaction in a patient with barium peritonitis: A case report.

INTRODUCTION: Barium peritonitis is a serious and life-threatening disease requiring intensive care. Residual barium in the intraperitoneal cavity can cause persistent inflammation, postoperatively. PRESENTATION OF CASE: An 80-year-old woman was admitted to our hospital because of abdominal pain and vomiting after barium meal examination. Physical and radiographic examination showed sigmoid colon perforation. Barium sulfate extravasation was noted in the intraperitoneal cavity. We diagnosed the patient with barium peritonitis, and performed Hartmann's procedure and thorough lavage of the intraperitoneal cavity with 20-L saline. Postoperative blood examination results were not readily improved because of the residual barium in the intraperitoneal and retroperitoneal cavities. We excluded the presence of any other inflammation origin, except that from residual barium. Methylprednisolone 500mg/body/day was administered for 3days and the dose was gradually decreased thereafter. The white blood cell count and serum C-reactive protein levels immediately improved to normal levels. DISCUSSION: Barium peritonitis is associated with high mortality. Residual barium in the intraperitoneal cavity can cause chemical peritonitis, leading to granuloma formation and ileus, postoperatively. Therefore, complete removal of barium in the abdominal cavity with aggressive drainage and large quantity of saline is necessary to prevent postoperative inflammatory reaction. The use of steroids improves the persistent inflammation caused by residual barium, unless any infectious origins are present, which can worsen with steroid-use. CONCLUSION: Residual barium in the intraperitoneal cavity causes persistent inflammatory reaction in patients with barium peritonitis. The use of steroids is effective for postoperative persistent inflammation due to the residual barium.

Prognostic significance of KLF4 expression in gastric cancer.

To understand the roles of pluripotent stem cell-inducing genes in gastric cancer, the expression of Krüppel-like factor 4 (KLF4), Nanog, octamer-binding transcription factor 4 (Oct4), avian myelocytomatosis viral oncogene homolog (c-Myc) and sex-determining region Y-box 2 (SOX2) was examined using the newly developed gastric carcinoma tissue microarray. The associations between the immunohistochemical expression levels of the pluripotency-inducing factors and the clinicopathological data of 108 patients with gastric cancer were analyzed. No associations were identified between the expression levels of the five pluripotency-inducing factors and the tumor-node-metastasis (TNM) classification or clinicopathological characteristics of the patients. In addition, multivariate analysis revealed no association of Nanog, Oct4, SOX2 or c-Myc with the prognosis of the gastric cancer patients; however, low expression of KLF4 was determined to be an independent negative prognostic factor (P=0.0331), particularly in patients who underwent R0 resection (TNM stages 2 and 3; P=0.0048). In summary, low KLF4 expression was found to be negatively associated with overall survival, and may therefore be a useful prognostic marker in gastric cancer patients.

The expression of microRNA 574-3p as a predictor of postoperative outcome in patients with esophageal squamous cell carcinoma.

BACKGROUND: Despite advances in radical esophagectomies and adjuvant therapy, the postoperative prognosis in esophageal squamous cell carcinoma (ESCC) patients remains poor. The aim of this study was to identify a molecular signature to predict postoperative favorable outcomes in patients with ESCC. METHODS: As a training data set, total RNA was extracted from formalin-fixed paraffin-embedded samples of surgically removed specimens from 19 ESCC patients who underwent curative esophagectomy. The expression of microRNA (miRNA) was detected using a miRNA oligo chip on which 885 genes were mounted. As a validation data set, we obtained frozen samples of surgically resected tumors from 12 independent ESCC patients and the expression of miR-574-3p was detected by quantitative real-time PCR. RESULTS: Our microarray analysis in the training set patients identified three miRNAs (miR-574-3p, miR-106b, and miR-1303) and five miRNAs (miR-1203, miR-1909, miR-204, miR-371-3p, miR-886-3p) which were differentially expressed between the patients with (n = 14) and without (n = 5) postoperative tumor relapse (p < 0.01 and p < 0.05, respectively). Higher expression of miR-574-3p, which showed the most significant association with non-relapse (p = 0.001), was associated with favorable overall survival (p = 0.016). Real-time PCR experiments on the validation set patients confirmed that higher expression of miR-574-3p was associated with non-tumor relapse (p = 0.029) and better overall survival (p = 0.004). CONCLUSIONS: Our results suggest that the aberrant expression of the miRNAs identified in this study plays key roles in the progression of ESCC. miR-574-3p was suggested to have a tumor suppressor effect, and thus, to be a predictor of postoperative outcome in patients with ESCC.

Perforation of intramural gastric metastasis during preoperative chemotherapy in a patient with thoracic esophageal squamous cell carcinoma.

INTRODUCTION: Perforation of intramural metastasis to the stomach (IMS) from esophageal cancer during chemotherapy has not been reported. PRESENTATION OF CASE: A 68-year-old male consulted our hospital due to appetite loss. He was diagnosed with advanced esophageal squamous cell carcinoma in the lower thoracic esophagus along with a large IMS in the upper stomach. The patient received preoperative chemotherapy of docetaxel, cisplatin, and 5-fluorouracil (DCF). During the second cycle of DCF, he had upper abdominal pain and was diagnosed with gastric perforation. Omental implantation repair for the perforation, peritoneal drainage, tube-gastrostomy, and tube-jejunostomy were performed. At 24 days after emergency surgery, he underwent thoracoscopic radical esophagectomy with total gastrectomy and reconstruction with colonic interposition. Pathological findings in the esophagus demonstrated complete replacement of the tumor by fibrosis. The gastric tumor was replaced by scar tissue with multinucleated giant cells along with a small amount of viable cancer cells. The patient was alive and healthy at 14 months after the radical operation, without tumor recurrence. DISCUSSION: The gastric perforation occurred due to rapid regression of the IMS which had involved the whole gastric wall before chemotherapy. Close monitoring to detect rapid tumor shrinkage during chemotherapy in patients with IMS may be warranted. A two-step operation was proposed to achieve safe curative treatment in patients with perforation of IMS during preoperative chemotherapy. CONCLUSION: We describe the first reported case of a patient with esophageal squamous cell carcinoma who showed perforation of IMS during preoperative chemotherapy.

CXCL16 suppresses liver metastasis of colorectal cancer by promoting TNF-α-induced apoptosis by tumor-associated macrophages.

BACKGROUND: Inhibition of metastasis through upregulation of immune surveillance is a major purpose of chemokine gene therapy. In this study, we focused on a membrane-bound chemokine CXCL16, which has shown a correlation with a good prognosis for colorectal cancer (CRC) patients. METHODS: We generated a CXCL16-expressing metastatic CRC cell line and identified changes in TNF and apoptosis-related factors. To investigate the effect of CXCL16 on colorectal liver metastasis, we injected SL4-Cont and SL4-CXCL16 cells into intraportal vein in C57BL/6 mice and evaluated the metastasis. Moreover, we analyzed metastatic liver tissues using flow cytometry whether CXCL16 expression regulates the infiltration of M1 macrophages. RESULTS: CXCL16 expression enhanced TNF-α-induced apoptosis through activation of PARP and the caspase-3-mediated apoptotic pathway and through inactivation of the NF-κB-mediated survival pathway. Several genes were changed by CXCL16 expression, but we focused on IRF8, which is a regulator of apoptosis and the metastatic phenotype. We confirmed CXCL16 expression in SL4-CXCL16 cells and the correlation between CXCL16 and IRF8. Silencing of IRF8 significantly decreased TNF-α-induced apoptosis. Liver metastasis of SL4-CXCL16 cells was also inhibited by TNF-α-induced apoptosis through the induction of M1 macrophages, which released TNF-α. Our findings suggest that the accumulation of M1 macrophages and the enhancement of apoptosis by CXCL16 might be an effective dual approach against CRC liver metastasis. CONCLUSIONS: Collectively, this study revealed that CXCL16 regulates immune surveillance and cell signaling. Therefore, we provide the first evidence of CXCL16 serving as an intracellular signaling molecule.

Synchronous asymptomatic colonic metastasis from primary esophageal squamous cell carcinoma.

The management of synchronous asymptomatic colonic metastases from primary esophageal squamous cell carcinoma (ESCC) has not yet been reported. A 64-year-old male patient was diagnosed with middle thoracic ESCC. The patient received chemoradiotherapy and incomplete response/stable disease was achieved. Preoperative colonoscopy revealed a 1.0-cm submucosal tumor at the splenic flexure of the colon, and biopsy results indicated possible metastasis from primary ESCC. The patient underwent subtotal esophagectomy and the colonic tumor was excised. A postoperative pathological diagnosis confirmed that the colonic tumor had metastasized from primary ESCC. Even though the patient was discharged 18 days after surgery without any complications, he died on the 72nd postoperative day due to multiple bone metastases and pleural dissemination. Our findings suggest that even with well-controlled and asymptomatic colonic metastasis from primary esophageal lesions, the prognosis of patients with primary ESCC is poor.

Glucose transporter 3 and 1 may facilitate high uptake of 18F-FDG in gastric schwannoma.

Recently, some gastric schwannomas have been reported to have high uptake of FDG. However, Glut-1 was reported to be negative in gastric schwannomas tested. A 64-year-old female patient received a laparoscopic partial gastrectomy for a FDG PET-positive submucosal tumor (SUVmax 6.61). The resected tumor was diagnosed as a benign gastric schwannoma. Glut family immunohistochemical examination revealed diffuse positive expression of Glut-3 and partial positive expression of Glut-1. On the other hand, Glut-2 and Glut-4 expression in the tumor were negative. This case suggested that Glut-3 and Glut-1 expression were facilitators of high FDG uptake in the benign gastric schwannoma.

Chemokine CXCL16 suppresses liver metastasis of colorectal cancer via augmentation of tumor-infiltrating natural killer T cells in a murine model.

Colorectal cancer (CRC) is a typical lifestyle-related disease, and it metastasizes mostly to the liver. It is important to understand the molecular mechanisms of CRC metastasis in order to design new and effective treatments for CRC patients. Chemokines are known to have antitumor effects as their chemoattractant properties stimulate the accumulation of infiltrating immune cells (TILs) in tumors. Chemokine (C-X-C motif) ligand 16 (CXCL16), also known as SR-PSOX, is a unique membrane-bound chemokine that induces the expression of its specific receptor CXCR6. We previously reported that the expression of CXCL16 by cancer cells enhances the recruitment of TILs, thereby improving the prognosis of CRC. It has since been reported that CXCL16/CXCR6 expression is involved in the metastasis of various types of cancer. However, there is no report of the association between CXCL16 expression and liver metastasis in CRC. In this study, we investigated the role of cancer-derived CXCL16 and the possibility of gene therapy using CXCL16. Therefore, we examined the metastasis of colon 38 SL4 cells to the liver in an experimental model. Following injection of cancer cells into the intraportal vein, CXCL16-expressing CRC cells drastically inhibited liver metastasis. We also found that CD8 T cells and natural killer T (NKT) cells, known as CXCR6-expressing cells, increased in CXCL16-expressing metastatic tissue. Collectively, the inhibitory effect on metastasis to the liver by CXCL16 was observed in NKT cell-depleted mice but not in CD8 T cell-depleted mice. These results demonstrate the inhibitory effect of CXCL16 on liver metastasis via NKT cells in CRC.