RESUMEN

BACKGROUND: Pancreatic ductal adenocarcinoma (PDAC) has a high recurrence rate even after curative resection. Lung recurrence may have better outcomes than other recurrences. However, its detailed clinicopathological features are unclear. We investigated the clinicopathological features and risk factors for lung recurrence after pancreatectomy for PDAC. METHODS: The study included 161 patients with potentially and borderline resectable PDAC who had undergone R0 or R1 pancreatectomy between January 2008 and December 2016. We retrospectively examined the prognosis and predictors for lung recurrence after curative resection. RESULTS: Seventeen patients (10.6%) had isolated lung recurrence. The median overall and recurrence-free survivals were 38.0 and 16.1 months, respectively. In multivariate analysis, para-aortic lymph node (PALN) metastasis (p = 0.006) and female sex (p = 0.027) were independent factors for lung recurrence. CONCLUSION: Lung recurrence had a better prognosis than other recurrences. PALN metastasis and female sex are independent risk factors for lung recurrence after curative resection for PDAC.

Asunto(s)

RESUMEN

BACKGROUND: Histiocytic sarcoma is a rare malignant tumor that is similar in characteristics to a mature histiocyte/macrophage and is a relatively new disease entity. In approximately one-third of cases, the site of origin is a lymph node; development from the gastrointestinal tract, spleen, soft tissue, and skin has further been reported. The tumor characteristics are not well-understood as reports on its clinical presentation and treatment are limited. We report a case of duodenal primary histiocytic sarcoma. CASE PRESENTATION: An elevated lesion in the second part of the duodenum was detected in a 70-year-old woman during routine examination using upper gastrointestinal tract endoscopy. Blood biochemistry findings were normal for tumor markers. No abnormal findings were observed in the blood count and biochemical examination. Upper gastrointestinal endoscopy revealed a 20-mm elevated lesion with a slight depression in the center, opposite to the papilla of the descending duodenum. The biopsy showed erosions of the mucosal epithelium and inflammatory cell infiltration, but no evidence of malignancy. Ultrasound-guided endoscopy revealed an ischemic tumor of submucosal origin, and bowel biopsy suggested a histiocytic sarcoma. Distant metastasis and lymph node enlargement were absent on abdominal sonography, computed tomography, and magnetic resonance imaging. Duodenal segmental resection was performed. Immunostaining of the excised lesion was positive for CD68, CD163, CD4, CD5, CD15, and CD45 and negative for CD1a, CD21, CD34, MPO, and S-100 protein. Ki-67 positivity was approximately 20%. Based on these findings, the diagnosis of histiocytic sarcoma was confirmed. Ten months after the surgery, a lymph node recurrence in the dorsum of the pancreatic uncus was observed. No evidence of recurrence was found in any other part; hence, we performed pancreaticoduodenectomy. Pathological findings of the excised lymph node confirmed the recurrence of histiocytic sarcoma in the lymph node. CONCLUSIONS: This is the first reported case of a duodenal primary histiocytic sarcoma with recurrence in the lymph node after the primary resection. The patient was treated for recurrence by lymph node excision and pancreaticoduodenectomy.

RESUMEN

Ruthenium catalysts may allow for realization of renewable energy-based ammonia synthesis processes using mild reaction conditions (<400 °C, <10 MPa). However, ruthenium is relatively rare and therefore expensive. Here, we report a Co nanoparticle catalyst loaded on a basic Ba/La2O3 support and prereduced at 700 °C (Co/Ba/La2O3_700red) that showed higher ammonia synthesis activity at 350 °C and 1.0-3.0 MPa than two benchmark Ru catalysts, Cs+/Ru/MgO and Ru/CeO2. The synthesis rate of the catalyst at 350 °C and 1.0 MPa (19.3 mmol h-1 g-1) was 8.0 times that of Co/Ba/La2O3_500red and 6.9 times that of Co/La2O3_700red. The catalyst showed ammonia synthesis activity at temperatures down to 200 °C. Reduction at the high temperature induced the formation of BaO-La2O3 nanofractions around the Co nanoparticles by decomposition of BaCO3, which increased turnover frequency, inhibited the sintering of Co nanoparticles, and suppressed ammonia poisoning. These strategies may also be applicable to other non-noble metal catalysts, such as nickel.

RESUMEN

BACKGROUND: Factors associated with long-term survival in gemcitabine-concurrent proton radiotherapy (GPT) for non-metastatic, locally advanced pancreatic cancer (LAPC) remain unclear. This study aimed to determine the factors associated with long-term survival in GPT for non-metastatic LAPC. METHODS: The medical records of 123 patients with LAPC treated with GPT between February 2009 and December 2019 at Hyogo Ion Beam Medical Center were retrospectively reviewed to assess the factors associated with long-term survival outcomes. RESULTS: The median overall survival of the total cohort treated with GPT was 18.7 months. The 1- and 2-year overall, local progression-free, and progression-free survival rates were 70.4% and 35.7%, 78.2% and 59.0%, and 38.6% and 20.8%, respectively. Multivariate analysis revealed that LAPCs at the pancreatic body-tail and those without anterior peripancreatic invasion were independently associated with longer overall survival (P = 0.040 and P = 0.015, respectively). The median overall survival of patients with LAPC at the pancreatic body-tail and those with LAPC without anterior peripancreatic invasion were 24.1 and 28.1 months, respectively. LAPCs at the pancreatic body-tail had a higher volume ratio irradiated over 60 Gy equivalents at gross tumor volume than those at the pancreatic head (P < 0.001). LAPCs with anterior peripancreatic invasion had more peritoneal recurrence within 6 months after GTP than those without anterior peripancreatic invasion (P = 0.039). CONCLUSIONS: GPT is a promising treatment option for patients with LAPC at the pancreatic body-tail and those with LAPC without anterior peripancreatic invasion.

Asunto(s)

RESUMEN

A 73-year-old woman underwent a subtotal stomach-preserving pancreaticoduodenectomy, wedge resection of the portal vein, and partial resection of the transverse colon for pancreatic cancer at the age of 71. After 18 months, a computed tomography image showed an 8 mm tumor in the ascending jejunal mesentery. Six months later, the tumor grew to 20 mm and had an increased FDG uptake. The tumor was diagnosed as metastasis of pancreatic cancer to the ascending jejunal mesentery. Since no metastasis was found in the other organs, resection was performed. The pathological results showed adenocarcinoma with proximal lymph node metastasis. The patient was diagnosed with ascending jejunal mesentery metastasis of pancreatic cancer. The patient has remained healthy without recurrent disease 1 year 6 months after the resection. Ascending jejunal mesentery metastasis of pancreatic cancer is a type of distant metastasis. In the absence of metastasis to other organs, it is tolerable and radical resection is possible.

Asunto(s)

RESUMEN

A woman in her 80s was diagnosed with pancreatic tail cancer by endoscopic ultrasound-guided fine needle aspiration (EUS-FNA). We performed laparoscopic distal pancreatectomy followed by adjuvant chemotherapy with S-1 for 6 months. One year after surgery, contrast-enhanced computed tomography revealed a 15 mm mass in the posterior wall of the gastric body. EUS showed a hypoechoic mass in the muscular layer in the gastric wall, which was diagnosed as adenocarcinoma by FNA. We diagnosed gastric wall recurrence due to needle tract seeding(NTS)following EUS-FNA and performed partial gastrectomy. Histopathological diagnosis was gastric wall recurrence of pancreatic cancer. Since NTS following EUS-FNA can be proven only by the presence of gastric wall recurrence after surgery for pancreatic body or tail cancer, the actual risk of NTS including peritoneal dissemination is not clear and may have been underestimated. In case of resectable pancreatic body or tail cancer, indication for EUS-FNA should be carefully considered.

Asunto(s)

RESUMEN

Ammonia is an important feedstock for producing fertiliser and is also a potential energy carrier. However, the process currently used for ammonia synthesis, the Haber-Bosch process, consumes a huge amount of energy; therefore the development of new catalysts for synthesising ammonia at a high rate under mild conditions (low temperature and low pressure) is necessary. Here, we show that Ru/La0.5Ce0.5O1.75 pre-reduced at an unusually high temperature (650 °C) catalysed ammonia synthesis at extremely high rates under mild conditions; specifically, at a reaction temperature of 350 °C, the rates were 13.4, 31.3, and 44.4 mmol g-1 h-1 at 0.1, 1.0, and 3.0 MPa, respectively. Kinetic analysis revealed that this catalyst is free of hydrogen poisoning under the conditions tested. Electron energy loss spectroscopy combined with O2 absorption capacity measurements revealed that the reduced catalyst consisted of fine Ru particles (mean diameter < 2.0 nm) that were partially covered with partially reduced La0.5Ce0.5O1.75 and were dispersed on a thermostable support. Furthermore, Fourier transform infrared spectra measured after N2 addition to the catalyst revealed that N2 adsorption on Ru atoms that interacted directly with the reduced La0.5Ce0.5O1.75 weakened the N[triple bond, length as m-dash]N bond and thus promoted its cleavage, which is the rate-determining step for ammonia synthesis. Our results indicate that high-temperature pre-reduction of this catalyst, which consists of Ru supported on a thermostable composite oxide with a cubic fluorite structure and containing reducible cerium, resulted in the formation of many sites that were highly active for N2 reduction by hydrogen.

RESUMEN

The first total synthesis of tricyclic bisnorsesquiterpene paralemnolide A, isolated from the soft coral Paralemnalia thyrsoides, was achieved. This synthesis features the lactonization of the cyclohexene derivative having a tert-butyl ester via stereoselective epoxidation followed by treatment with a Brønsted acid and construction of the novel tricyclic skeleton by an intramolecular Reformatsky-Honda reaction.

RESUMEN

A photofuel cell comprising two photocatalysts TiO2 and Ag-TiO2 is demonstrated. The open circuit voltage, short circuit current, and maximum electric power of the PFC were 1.59 V, 74 µA, and 14 µW, respectively. The electron flow was rectified due to the Schottky barrier between TiO2 and Ag nanoparticles.

RESUMEN

A 78-year-old man, who had been pointed out elevation of the diaphragm by chest radiography, visited local physician complaining of abdominal pain and vomiting. He was referred to our hospital and was diagnosed as intestinal obstruction. The patient had neither respiratory symptoms nor findings of peritonitis. The radiography revealed intestinal gas with neveau formation in the left thorax. The computed tomography showed dilatation of the stomach and small intestine, and a diaphragmatic hernia was suspected. Although conservative treatment was started, radiographic and laboratory findings got worse on the 5th hospital day. The patient underwent surgery for a left diaphragmatic hernia with the intestinal obstruction. Diagnosis of Bochdalek hernia with hernia sac was established. The content of hernia was the perforated small intestine. Postoperative course was almost uneventful, and the patient was discharged on the 35th postoperative day without pyothorax. In treatment of adult Bochdalek hernia, early surgery is important because patients with incarceration or perforation often experience severe postoperative complication.

Asunto(s)

RESUMEN

Thirty-eight patients less than 30-year-old with spontaneous pneumothorax, of which onset date were known between January 2001 and December 2007, were included in this study. Meteorological factors such as temperature, humidity, atmospheric pressure, amount of rainfall and actual sunshine duration were assessed for the onset days of spontaneous pneumothorax (SP days) compared with days without pneumothorax (non-SP days) in the analyzed periods. The difference of those meteorological factors between the index day and one day before were also assessed. No significant difference was found in meteorological factors between SP and non-SP days. While, significant change in minimal temperature between SP days and non-SP days was found (+1.000 degrees C vs -0.015 degrees C, p=0.019). Meteorological factors may affect the onset of spontaneous pneumothorax in young adults. However, further assessment of accumulation of the patients is necessary including multi-institute study.

Asunto(s)

RESUMEN

A-76-year-old woman consulted for open biopsy for a pulmonary mass. Thoracoscopic wedge resection was performed. The lesion was histologically diagnosed as nonspecific inflammation. On the first postoperative day (POD1), the patient lost consciousness transiently. Eleven hours after the first stroke, the patient experienced a second stroke together with hypoxia. Pulmonary perfusion scan on POD2 showed multiple perfusion defects, and the patient was diagnosed with pulmonary embolism (PE). Thrombolitic therapy was started. Neurological symptoms didn't improve, and cerebral angiography on POD3 showed delayed perfusion in superficial veins. The patient was diagnosed with cerebral venous thrombosis (CVT). Thrombolytic and anticoagulant therapy had been continued, and the patient was found to have hemorrhagic cerebral infarction on POD11. After persistent therapy, the patient was discharged on POD120. Although both PE and CVT are rare complications after thoracic surgery, we must consider these complications in patients undergoing thoracic operations including thoracoscopic surgery.

Asunto(s)

RESUMEN

To clarify the reason why central fibrosis (CF) is an important histological prognostic factor in small adenocarcinoma (SA) of the lung, tumor tissues from 50 patients with SA < or = 2 cm in diameter were investigated using immunohistochemical and in situ hybridization analysis for factors relating to extracellular matrix and vessels. CF was observed in 33/50 cases (66%). In adenocarcinoma areas, positive activity was observed with both primary antibodies and probes for matrix metalloproteinase-2 (MMP-2) in 11/50 patients (22%), membrane-type 1 matrix metalloproteinase (MT1-MMP) in 39/50 patients (78%) and tissue inhibitor of metalloproteinase-2 (TIMP-2) in 49/50 patients (98%). In CF areas, the positive activity of fibroblastic cells was seen for only TIMP-2 in 32/33 patients (97%). In CF areas, both CD34-positive (blood and lymphatic) vessels and D2-40-positive lymphatic vessels were semiquantitatively increased in 16/33 patients (48.5%) by immunohistochemistry. Tumors with increased vessel density were associated with statistically lower disease-free survival curves compared with tumors without increased vessels. Lymphatic vessels in some CF showed intravasation by carcinoma cells. In conclusion, CF could be an important histological prognostic factor in SA chiefly because of its association with angiogenesis and lymphangiogenesis.

Asunto(s)

Asunto(s)

RESUMEN

The simultaneous association of gastric carcinoma with gastric lymphoma is a rare event. Recent studies have suggested that not only gastric cancer but also primary gastric lymphomas, especially those of mucosa-associated lymphoid tissue (MALT) type, are associated with Helicobacter pylori infection. We report on a 51-year-old woman who was referred to our hospital for the evaluation of abnormal shadows revealed by an upper gastrointestinal radiography series. Endoscopy of the upper gastrointestinal tract revealed early cancer in the middle body of the stomach. Biopsy of the lesion subsequently proved it to be a signet-ring cell carcinoma. Total gastrectomy was performed, under a diagnosis of early gastric carcinoma. The resected specimen revealed two grossly separate lesions. Histological examination confirmed that the gastric body lesion was compatible with early moderately differentiated tubular adenocarcinoma of type 0-IIc, while the lesion of the fundus corresponded to MALT lymphoma. H. pylori was detected, and chronic gastritis was also present in the resected gastric specimen. H. pylori infection may have played a major role in the development of both the MALT lymphoma and the adenocarcinoma of the stomach in this patient.

Asunto(s)