Publications by authors named "Tomokazu Umezu"

Thrombotic microangiopathy (TMA) is a rare yet potentially life-threatening condition. The diagnosis is difficult as there are other conditions presenting with features akin to TMA during the peripartum period such as eclampsia, preeclampsia, hemolysis, elevated liver enzymes, low platelets (HELLP) syndrome, and antiphospholipid syndrome. A 28-year-old woman with no significant past medical history developed TMA following a massive hemorrhage after an emergency cesarean section at 41 weeks of gestation.

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Objectives: This study was conducted to estimate the oncologic outcome of stage I epithelial ovarian carcinoma (EOC) patients after recurrence.

Study Design: After central pathological review and searching of the medical records of multi-institutions, a total of 103 relapsed patients with stage I EOC were analyzed. The major endpoint was postrecurrence survival (PRS).

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Background: Little is known about patterns and predictive factors regarding opioid use for terminally ill patients with gynecologic malignancies. The aim of this study was to elucidate predictors affecting opioid requirements of end-of-life patients with gynecologic malignancies.

Methods: A retrospective study was carried out on patients with gynecological malignancies admitted to our institute and died during the years 2002 to 2012.

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Aim: We aimed to investigate the possibility of an association between a stem-like hallmark and radiotherapeutic sensitivity in human cervical carcinoma cells.

Material And Methods: Side-population (SP) cells and non-SP (NSP) cells in HeLa cells were isolated using flow cytometry and Hoechst 33342 efflux. We performed Western blot analysis to evaluate the expression of stem cell markers (CXCR4, Oct3/4, CD133, and SOX2) and apoptosis markers after irradiation.

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Background: It remains unknown whether the end-of-life (EOL) environment influences survival after anticancer treatment, particularly for gynecologic malignancy.

Objective: The study's objective was to clarify whether the survival time varied depending on where patients spend the EOL.

Methods: This retrospective study included patients who received initial oncologic treatment but died due to cancer recurrence and/or progression.

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Objective: This study was conducted to examine the effects of front-line chemotherapy on overall survival (OS) and postrecurrence survival (PRS) of patients with recurrent ovarian cancer, when stratifying the histologic type.

Methods: Five hundred and seventy-four patients with recurrent ovarian cancer with sufficient clinical information, including front-line chemotherapy, were analyzed. The pathologic slides were evaluated by central pathologic review.

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Objectives: We retrospectively analyzed the clinicopathological features and evaluated the prognostic indicators of recurrence in 132 patients with clear cell adenocarcinoma (CCC) of the ovary at reproductive age.

Patients And Methods: Between 1986 and 2011, as a regional population-based study, clinicopathological data on 132 young patients with CCC, collected under the central pathological review system, were subjected to uni- and multivariable analyses to evaluate recurrence-free survival (RFS).

Results: The median age was 40 (27-45) years.

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Endoglin (CD105), an accessory receptor of transforming growth factor-β, is expressed in vascular endothelial cells. Recently, it was reported that endoglin expression was significantly associated with poorer survival in several cancers. In this study, we evaluated the role of endoglin in uterine leiomyosarcoma.

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Article Synopsis
  • The study aimed to evaluate how effective Sonazoid-enhanced ultrasonography (US) is for diagnosing ovarian cancer compared to traditional Doppler US.
  • Twenty-five patients with ovarian tumors were assessed using different ultrasound techniques before surgery, and their tumors were classified as benign or malignant based on various criteria.
  • Results showed that Sonazoid-enhanced US had a 92% accuracy in detecting blood flow in tumors, outperforming color Doppler (64% accuracy) but not power Doppler (76% accuracy); however, caution is advised due to the small sample size and further research is needed.
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Twist, a basic helix-loop-helix transcription factor, promotes cancer cell epithelial-mesenchymal transition and metastasis. Here, we aimed to examine the association between Twist expression and lymphovascular space involvement for early-stage cervical carcinoma. Paraffin sections from 90 patients with stage Ib to IIb cervical carcinoma were immunostained with Twist antibody, and the staining intensities were semiquantitatively evaluated.

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Objectives: To estimate the long-term clinical outcome of patients with recurrent clear cell carcinoma (RCCC) of the ovary in comparison with those with recurrent serous adenocarcinoma (RSAC).

Patients And Methods: In this study, 113 patients with RCCC and 365 patients with RSAC were analyzed. The pathological slides were evaluated under central pathological review.

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Aim: The effect of systematic retroperitoneal lymphadenectomy (SRL) remains controversial in patients with advanced epithelial ovarian cancer (aEOC) who are optimally debulked.

Material And Methods: Demographic and clinicopathologic data were obtained from the Tokai Ovarian Tumor Study Group between 1986 and 2009. All patients were divided into two groups.

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Aim: Primary ovarian malignant germ cell tumors (OMGCTs) are rare and difficult to diagnose. Immunohistochemistry can help in the diagnosis and development of new management strategies. The aim of this study was to investigate the frequency of CD117, CD133, SALL4, OCT4, TCL1 and glypican-3 marker expression in OMGCTs.

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Objective: This study was conducted to estimate the long-term clinical outcome of patients with recurrent ovarian carcinoma (ROC).

Methods: Six hundred three patients with ROC were analyzed in this study. The pathological slides were evaluated under central pathological review.

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Recent reports have shown that CXCR4 is expressed in various solid tumors and is involved in tumor development and metastasis. We examined the distribution and expression of this molecule in clear cell carcinoma of the ovary to elucidate its clinical significance. Paraffin sections from clear cell carcinoma of the ovary tissues (n = 42) were immunostained with CXCR4 antibody, and the staining intensities were evaluated.

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Objective: In recent years it has been indicated that ecological niches play important roles in the maintenance of cancer stem cells (CSCs). We investigated interactions between peritoneal mesothelial cells and SC-OYST based on the hypothesis that peritoneal mesothelial cells have the potential to provide one of the niches for SC-OYST.

Methods: We divided NOY1 cells into CD133-positive and -negative cells.

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It is known that mutant mice of the beta-1,3-N-acetylglucosaminyltransferase gene (beta3Gn-T5) respond well to T-cell dependent and independent antigens. Here, we examined the effectiveness of anti-ganglioside antibody generation by immunization of beta3Gn-T5 mutant mice with liposome-embedded glycosphingolipids such as GD1a and GT1b. Consequently, the mutant mice showed a more efficient generation of anti-GD1a or anti-GT1b antibodies than wild-type mice in an enzyme-linked immunosorbent assay using sera during immunization.

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Purpose: This study aimed to identify prognostic factors in patients with stage IA-IIA cervical cancer who had undergone radical surgery and clarify whether the waiting time to the operation affected the recurrence and survival outcome.

Materials And Methods: We retrospectively reviewed the records of 117 patients who underwent surgical resection for stage IA-IIA cervical cancer. Patients were subdivided based on the waiting time from the initial visit to a gynecologist until surgery.

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Background: Cisplatin is used as a key drug for ovarian yolk sac tumor (YST), but relapse may occur. Details of the molecular mechanism responsible for cisplatin resistance remain unclear.

Methods: We established cisplatin-resistant ovarian YST cells (NOY1-CR) from parent NOY1.

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Background: Glypican-3 (GPC3), a membrane-bound heparan sulphate proteoglycan, may play a role in promoting cancer cell growth and differentiation. Recent studies reported that GPC3 is overexpressed in clear cell carcinoma (CCC) of the ovary, and not other ovarian histotypes. However, in CCC patients, the relationship between the overexpression of GPC3 and prognosis has not yet been clarified.

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Recent evidence supports the cancer stem cell theory, that is, that malignant tumors arise from cells termed cancer stem cells or tumor-initiating cells that have the ability to self-renew and are responsible for maintaining the tumor. Cells with marked tumor-initiating capacity have recently been identified in a number of solid tumors. CD133 (PROM1, human prominin-1) has been used as a marker to detect stem cells (progenitor cells) and cancer stem cells (tumor-initiating cells) in various tissues.

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Objective: Ovarian clear cell carcinoma (CCC) is well known to be highly resistant to platinum-based chemotherapy. Glypican-3 (GPC3), a membrane-bound heparan sulfate proteoglycan, is overexpressed in only CCC of epithelial ovarian carcinoma subtypes. The purpose of this study was to identify the role of GPC3 in ovarian CCC.

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Objective: Indoleamine 2,3-dioxygenase (IDO) is a tryptophan-catabolizing enzyme that induces tolerance to host immune surveillance within the tumor microenvironment. The present study aimed to investigate IDO expression and its prognostic significance in invasive cervical cancer.

Methods: Immunohistochemical expression of IDO in tumor tissues and its association with clinicopathological factors and survival were analyzed in 112 stage IB-IIB cervical cancer patients treated with radical hysterectomy and pelvic lymphadenectomy.

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Uterine hemorrhage is a major complication associated with abortion. There are various causes of postabortion uterine hemorrhage. The objective of this article is to estimate the efficacy of three-dimensional computed tomography (3D-CT) angiography in the diagnosis of this condition.

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Purpose: To assess the correlation of intrafollicular insulin, leptin and adiponectin levels with assisted reproductive technologies (ART) outcome.

Methods: This was a retrospective study of 46 patients undergoing in vitro fertilisation/intracytoplasmic sperm injection. Follicular fluid (FF) samples collected at oocyte retrieval were assayed for insulin, leptin and adiponectin levels using enzyme-linked immunosorbent assay, and correlations with ART outcome were analysed.

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