Publications by authors named "Yasunori Ohta"

Aberrant activation of the Wnt/β-catenin signaling pathway plays a crucial role in the development and progression of colorectal cancer. Previously, we identified a set of candidate genes that were regulated by this signaling pathway, and the present study focused on motile sperm domain containing 1 (). Immunohistochemical staining revealed that the expression of MOSPD1 was elevated in tumor cells from colorectal cancer tissues compared with in non-tumor cells.

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Background: Currently, there is an unwavering consensus that the standard surgery for congenital biliary dilation (CBD) is extrahepatic bile duct resection and choledochojejunostomy. However, decades prior, choledochocyst-gastrointestinal anastomosis without extrahepatic bile duct resection (internal drainage surgery, IDS) was preferred for CBD because of its simplicity. Currently, there is almost no chance of a surgeon encountering a patient who has undergone old-fashioned IDS, which has been completely obsolete due to the risk of carcinogenesis from the remaining bile duct.

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Biliary tract cancer (BTC) is one of the most devastating types of malignant neoplasms worldwide. However, the mechanisms underlying the development and progression of BTC remain unresolved. BTC includes extrahepatic bile duct carcinoma (EBDC), gallbladder carcinoma (GBC) and ampulla of Vater carcinoma (AVC), named according to the location of the tumor.

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Three patients under hemodialysis (HD) with relapsed/refractory multiple myeloma (MM) were administered panobinostat/bortezomib/dexamethasone (FVD). Case 1: The patient was a 66-year-old male with BJP-κ. FVD was effective, but HD could not be discontinued.

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Background: Plexiform angiomyxoid myofibroblastic tumor (PAMT) is a very rare mesenchymal tumor of the stomach. Here we report a case of pathologically confirmed PAMT with an unique cyst formation.

Case Presentation: A 55-year-old male with a 10-year history of a gastric subepithelial tumor underwent computed tomography (CT) and magnetic resonance imaging (MRI).

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Purpose: To clarify the development of HCC, temporal change of steatosis and Gd-EOB-DTPA enhancement of non-alcoholic steatohepatitis (NASH) model mice by magnetic resonance imaging (MRI).

Materials And Methods: All animal experiments were approved by the institution's Animal Research Committee. MRI was performed on six NASH and six simple steatosis (SS) model mice every 2weeks from the ages of 8weeks to 16weeks.

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Background: Pseudomyxoma peritonei (PMP) is a rare disease with an estimated incidence of 1-2 cases per million individuals per year. PMP is characterized by the accumulation of abundant mucinous or gelatinous fluid derived from disseminated tumorous cells. Most of the tumorous cells are originated from rupture of appendiceal neoplasms, but some are from the metastasis of cancer of the colon, ovary, fallopian tube, urachus, colorectum, gallbladder, stomach, pancreas, lung and breast.

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TAFRO syndrome is a systemic inflammatory disorder characterized by thrombocytopenia, anasarca including pleural effusion and ascites, fever, renal insufficiency, and organomegaly including hepatosplenomegaly and lymphadenopathy. Its onset may be acute or sub-acute, but its etiology is undetermined. Although several clinical and pathological characteristics of TAFRO syndrome resemble those of multicentric Castleman disease (MCD), other specific features can differentiate between them.

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Pseudomyxoma peritonei (PMP) is a rare disease exhibiting a distinct clinical feature caused by cancerous cells that produce mucinous fluid in the abdominal cavity. PMPs originate most frequently from the appendix and less frequently from the ovary. This disease can range from benign to malignant, and histologically, PMP is classified into two types: disseminated peritoneal adenomucinosis (DPAM) representing the milder phenotype, and peritoneal mucinous adenocarcinomas (PMCA) representing the aggressive phenotype.

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A 41-year-old man presented with the chief complaint of right hip pain that had persisted for 6 months. F18-fluorodeoxyglucose (FDG) positron emission tomography/computed tomography (PET/CT) imaging showed FDG accumulation in the right pubic bone. A bone biopsy specimen from the site revealed findings suggestive of a plasma cell tumor.

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A 68-year-old man presented to us with pancytopenia, erythroderma, and multiple lymphadenopathies. Lymph node biopsy led to the diagnosis of peripheral T-Cell lymphoma-not otherwise specified (PTCL-NOS). Immunostaining of the lymph node biopsy specimens for cytokines revealed that the tumor cells were positive for plated-derived growth factor (PDGF), basic fibroblast growth factor (b-FGF), vascular endothelial growth factor (VEGF), tumor necrosis factor α (TNF-α), interferon-γ (IFN-γ), interleukin-1β (IL-1β), interleukin-2 (IL-2), and transforming growth factor-β (TGF-β).

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A 61-year-old woman was diagnosed as having rheumatoid arthritis (RA) and began treatment with salazosulfapyridine (SASP) and methotrexate (MTX) in 2008; the administration of concomitant tacrolimus (TAC) was initiated in 2010. She subsequently developed concurrent multiple myeloma (MM), immunoglobulin G (IgG)-κ type, in 2012. A portion of the tumor cells tested positive for Epstein-Barr virus-encoded small RNA (EBER).

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Pressure ulcers result from tissue hypoxia caused by external forces. Thrombosis due to external forces is considered important, and hypoxia inducible factor-1 (HIF-1) is a master regulator of pressure ulcer development. To date, however, their causal relationship has not been determined.

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A 36-year-old woman with a left lung tumor was referred to our hospital since a pathological diagnosis had not been obtained at a previous medical institution. We carried out CT-guided percutaneous lung biopsy with an 18-gauge needle and obtained four samples. Immunological staining revealed the specimens to be CD30- and PAX5-positive, with large dysplastic lymphocytes negative for Bob-1 and Oct-2 with a background of small lymphocytes and eosinophils.

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A 60-year-old man complained of nausea, vomiting, decreased appetite, and a feeling of abdominal fullness in August 2013. Based on biopsy findings from an upper gastrointestinal endoscopy examination, a diagnosis of non-Hodgkin's lymphoma (NHL), diffuse large B-cell lymphoma (DLBCL), non-GC type, was made. F18-fluorodeoxyglucose-positron emission tomography/computed tomography (FDG-PET/CT) revealed abnormal accumulations solely in the gastric wall (SUVmax = 14.

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A 61-year-old woman was diagnosed in June 2011 as having immunoglobulin G (IgG) ĸ-type multiple myeloma (MM), stage II, according to the International Staging System (ISS). Chromosome analysis showed a complex karyotype, including t(11;14) and del 13q. Analysis of the cell surface markers revealed that the cells were positive for mature plasma cell-1 (MPC-1), and negative for cluster of differentiation (CD) 45 and CD49e, suggestive of an intermediate level of maturity of the cells.

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A 70-year-old man presented to us with the chief complaints of a generalized rash and a mass in the right clavicular region that he first noticed in the year 2012. Biopsy of the mass led to the diagnosis of cutaneous nodular mass-type adult T-cell leukemia/lymphoma (ATLL) in March 2013. Phototherapy was started, and the symptoms improved temporarily.

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A 50-year-old woman who presented with a mass in the thyroid gland was diagnosed as having diffuse large B-cell lymphoma (DLBCL) by biopsy in August 2011. The tumor had a complex chromosomal karyotype, including 8q24 (C-MYC) and 18q21(BCL-2), and fluorescence in situ hybridization confirmed split signals of C-MYC and BCL-2. BCL-2/IgH and C-MYC/IgH fusion signals were also observed.

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We demonstrated enhanced hair regeneration following topical administration of N-(3-oxododecanoyl)-l-homoserine lactone (HSL) in ob/ob mice. The ob/ob mice showed delayed hair regeneration (more than 6 wk) after depilation, which rapidly induced transition to anagen in the hair cycle in wild-type mice. Vehicle and HSL solutions were applied to the depilated dorsal skin of ob/ob mice.

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Angioimmunoblastic T cell lymphoma (AITL) is a distinct subtype of peripheral T cell lymphoma characterized by generalized lymphadenopathy and frequent autoimmune-like manifestations. Although frequent mutations in TET2, IDH2 and DNMT3A, which are common to various hematologic malignancies, have been identified in AITL, the molecular pathogenesis specific to this lymphoma subtype is unknown. Here we report somatic RHOA mutations encoding a p.

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A Japanese man aged 30 years old contracted acute hepatitis B in October 2011, and was cured following conservative treatment. Mild hepatosplenomegaly was the only positive finding on computed tomography (CT) and ultrasonography at that time. In May 2012, slight impairment of the liver function was detected again in the patient; an abdominal CT at this time revealed a tumor mass in the right hepatic lobe, so subsegmentectomy of the right hepatic lobe was performed.

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A 65-year-old man was diagnosed with angioimmunoblastic T-cell lymphoma (AITL) with bone marrow (BM) infiltration and myelofibrosis (MF). The BM infiltration and the condition of the MF improved following CHOP therapy (cyclophosphamide hydrate, doxorubicin hydrochloride, vincristine sulfate, and prednisolone). After complete remission was achieved, early central nervous system recurrence was noted, with no evidence of BM infiltration or MF.

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Because of increasing indications for post-mastectomy irradiation and a growing demand for breast reconstruction using expanders and implants, both these procedures are performed in increasing numbers of patients. Although it is known that irradiation increases the difficulty of subsequent breast reconstruction, there is still insufficient information regarding differences in radiation-induced histopathological changes between individuals. In this study, we had the opportunity to take skin biopsy specimens from both the irradiated and non-irradiated breasts of 20 patients, and examine the histopathological differences between them.

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Nodular fasciitis of the breast is a rare, benign, soft-tissue tumor that can clinically and radiologically mimic invasive ductal carcinoma. A 25-year-old woman presented with a palpable lesion in the lower inner aspect of the left breast. Radiologically, breast carcinoma could not be excluded.

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