Masakazu Nishida

Oita University, Ōita, Ōita, Japan

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Publications (77)192.17 Total impact

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    Tumor Biology 06/2015; DOI:10.1007/s13277-015-3666-x · 3.61 Impact Factor
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    ABSTRACT: Lymphoepithelioma-like carcinoma occurring in the reproductive organs is a rare variant of squamous cell carcinoma, and this tumor of the uterine cervix accounts for 0.7% of all primary cervical uterine neoplasms. Associations with Epstein-Barr virus (EBV) and human papilloma virus (HPV) have been demonstrated in some studies. Some investigators suggested that EBV has an important role in the initiation of lymphoepitheliomalike carcinoma in Asian women. Here we report the case of a 45-year-old Japanese woman, gravida 2 and parity 2. She was admitted due to severe atypical genital bleeding caused by uterine cervical cancer. A >60-mm tumor was detected at the uterine cervix, and no distal metastasis or swallowing of lymph nodes was revealed by magnetic resonance imaging and a computed tomography scan. The cervical cancer stage FIGO Ib2 was diagnosed, and a radical hysterectomy was performed for this malignant tumor. The in situ hybridization for EBV was negative. HVP infection was strongly suspected because the squamous cell carcinoma was observed macroscopically in the uterine cervix. The prognosis of uterine lymphoepithelioma-like carcinoma is thought to be better than those of other cervical cancer types, but careful follow-up at fixed intervals is recommended. The patient has been followed up for 4 months since her surgery, and no evidence of recurrence has been detected.
    Rare tumors 02/2015; 7(1):5688. DOI:10.4081/rt.2015.5688
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    ABSTRACT: The incidence of ectopic pregnancy is approximately 1.3-2% of all pregnancies, and more than 90% of ectopic pregnancies are detected in the ampulla of the fallopian tube. Ectopic pregnancy occurring in tubal stump after tubectomy is extremely rare, and the frequency of tubal stump pregnancy is approximately 0.4% of all pregnancies. We report one of these rare cases of ectopic pregnancy in a 26-year-old Japanese woman, gravida 4, parity 1. She had undergone laparoscopic tubectomy because of a tubal pregnancy two years ago. She was presented to our hospital with a positive pregnancy test, but no gestational sac was detected in the uterus by echography, even though the level of human chorionic gonadotropin (hCG) in the blood was elevated to 8,900 mIU/mL. Laparoscopic surgery for ectopic pregnancy was performed. During surgery, the position of the pregnancy was found to be in the tubal stump, where tubectomy had already been performed, and the gestational sac was successfully removed. After the surgery, the condition of the patient uneventfully improved and she was discharged from the hospital three days after the surgery. The diagnosis of tubal stump pregnancy is more difficult than that of the more common positions of an ectopic pregnancy in the fallopian tube, and so it is more important to carefully examine the patients with suspected ectopic pregnancy. Laparoscopic surgery is one of the options for tubal stump pregnancy if diagnosed early and if the condition of the patient is stable.
    01/2015; 8:1. DOI:10.4137/CCRep.S20907
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    ABSTRACT: Mayer-Rokitanski-Kuster-Hauser (MRKH) syndrome is a rare disease. A 27-year-old woman was admitted for primary amenorrhea and cyclic pelvic pain. Magnetic resonance imaging (MRI) revealed bilateral Müllerian remnants with functioning endometrium and a pelvic mass considered to be an endometriotic cyst. Bilateral Müllerian remnants were removed, and right ovarian cystectomy was performed at laparoscopic surgery. Accurate evaluation before the operation and informed consent are necessary to treat patients with MRKH syndrome.
    09/2014; 5:43-5. DOI:10.4137/JCM.S12611
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    ABSTRACT: While mature cystic teratoma of the ovary is the most common ovarian tumor in young women, immature teratoma is a very rare tumor, representing only 1% of all ovarian cancers. In the three cases presented here, young women who were suspected to have mature cystic teratoma, based on CT scan and MRI, were ultimately diagnosed with immature teratoma Ic (b) G1 after laparoscopic operation. They underwent salpingo-oophorectomy of the affected side only and have shown no sign of recurrence during follow-up. We sometimes encounter patients with immature teratoma who have no findings pointing to malignancy on CT or MRI. Generally, if the components of immature nerve cells that represent immature teratoma are very few, it is difficult to diagnose the entity as immature teratoma with imaging evaluations such as CT or MRI. In many hospitals, laparoscopic surgery is selected for patients with ovarian mature teratoma. Therefore, it is essential to attempt as much as possible not to disseminate the fluid content of the tumor into the intra-abdominal space during laparoscopic operation, because in rare cases the tumor turns out not to be benign mature teratoma.
    09/2014; 7:91-4. DOI:10.4137/CCRep.S17455
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    ABSTRACT: A 33-year-old woman with type 2 diabetes mellitus (DM) was suspected of being primarily infected with Toxoplasma gondii at 12 weeks of gestation (GW). Although acetylspiramycin was started at 17 GW, the T. gondii DNA gene was detected in the amniotic fluid at 18 GW. Chemotherapy was changed to pyrimethamine plus sulfadiazine from 20 GW, but was changed back to acetylspiramycin after 2 weeks because of vomiting. Acetylspiramycin was continued until her delivery. DM was controlled well during the pregnancy. An asymptomatic male baby was born by cesarean section at 37 GW, and was treated with acetylspiramycin for 4 weeks because the polymerase chain reaction results of umbilical cord blood were positive. He has developed normally until the present, that is, 6 months of age. Herein, we describe a case report in which symptomatic congenital toxoplasmosis was avoided in a pregnant woman with an immunosuppressive risk due to prompt chemotherapy.
    Journal of Obstetrics and Gynaecology Research 09/2014; 40(11). DOI:10.1111/jog.12477 · 0.93 Impact Factor
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    ABSTRACT: Grade 3 immature teratoma of the ovary is rare and has a poor prognosis due to early recurrence. This report describes a case of grade 3 immature teratoma of the ovary that recurred 16 years after the last treatment. The patient underwent abdominal simple total hysterectomy, bilateral salpingo-oophorectomy, pelvic-para-aortic lymphadenectomy, and adjuvant chemotherapy under the diagnosis of grade 3 immature teratoma of the ovary when she was 15 years old, and complete remission was achieved. Sixteen years after the initial treatment, the tumor relapsed in her liver and pleura. She was treated by 10 courses of tri-weekly paclitaxel and carboplatin, and was alive with stable disease for 12 months after the disease relapse. After 1 year, the tumor progressed, and she died 16 months after the relapse. This is the first report of grade 3 immature teratoma of the ovary that relapsed more than 5 years after the prior treatment.
    Journal of Obstetrics and Gynaecology Research 05/2014; 40(5). DOI:10.1111/jog.12359 · 0.93 Impact Factor
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    ABSTRACT: We present two rare cases of carcinosarcoma of the ovary treated successfully with paclitaxel and carboplatin therapy. Case 1: A 79-year-old Japanese woman was diagnosed with carcinosarcoma of the ovary stage IV. We administered neoadjuvant chemotherapy (paclitaxel 180 mg/m2 and carboplatin AUC 6). After three cycles, she underwent a bilateral salpingo-oophorectomy, hysterectomy and omentectomy as a debulking procedure. She received another three cycles of paclitaxel and carboplatin therapy as adjuvant therapy. She is well without evidence of disease 6 months after the sixth chemotherapy cycle. Case 2: A 74-year-old Japanese woman was diagnosed with carcinosarcoma of the ovary stage IIIc. We performed hysterectomy, bilateral salpingo-oophorectomy, partial resection of small intestine, pelvic lymphadenectomy, omentectomy and low anterior resection of the rectosigmoid colon as the primary debulking surgery. She received six cycles of paclitaxel and carboplatin therapy as adjuvant therapy. She has been recurrence free for 6 years. The standard chemotherapy for ovarian carcinosarcoma is not established, but we think that paclitaxel and carboplatin therapy for progressive ovarian carcinosarcoma as an adjuvant therapy might become a standard chemotherapy if further cases of ovarian carcinosarcoma treated with paclitaxel and carboplatin therapy are reported.
    04/2014; 4(2). DOI:10.1007/s13691-014-0175-5
  • S Sato · M Nishida · Y Furukawa · K Nasu · H Narahara
    Journal of Obstetrics and Gynaecology 01/2014; 34(4). DOI:10.3109/01443615.2013.865010 · 0.60 Impact Factor
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    ABSTRACT: Background: Placental polyps can causes massive postpartum hemorrhage. The traditional treatment for a placental polyp is a hysterectomy. However, for patients desirous of a subsequent pregnancy, an alternative treatment option is uterine artery embolization (UAE) and hysteroscopic surgery.Patients: Case 1 is a 35-year-old Japanese gravida 0, para 0 who had an unremarkable medical and family history. She delivered at another hospital, and was transferred to our hospital because of massive hemorrhage secondary to residual placenta. The residual placenta was completely excised at our hospital. One month later, she was again transferred to our hospital due to recurrent hemorrhage; a placental polyp was imaged by an ultrasound examination. She was strongly desirous of uterine preservation; therefore, she was successfully treated by UAE and hysteroscopic resection of the placental polyp. Cases 2 through 5 had similar clinical findings as that of Case 1 and were successfully treated by UAE and/or hysteroscopic surgery.Conclusions: UAE and hysteroscopic surgery is effective for the treatment of a placental polyp. Conversely, some cases of placental polyps spontaneously resolve without any treatment. Therefore, we must recognize that there are many cases of placental polyps that can be treated with uterine preservation, if the general patient status is stable.
    01/2014; 30(1):253-257. DOI:10.5180/jsgoe.30.253
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    ABSTRACT: Ovarian cancer is the second most common gynecological malignancy, yet it has the highest case-fatality ratio of all gynecologic malignancies. Surgery followed by combination platinum-taxane chemotherapy is the standard approach to the management of primary epithelial ovarian cancer. However, standard treatment of patients with recurrent ovarian cancer remains poorly defined. Secondary cytoreductive surgery (SDS) at the time of relapse has been proposed as a means of improving the prognosis of recurrent ovarian cancer patients with a treatment-free interval of at least 6 months. In the present study, we retrospectively collected 16 patients with recurrent epithelial ovarian cancer who might benefit most from SDS and evaluated the impact of SDS on the outcomes for this highly select patient group. We found that SDS led to excellent outcomes, with a 73.1% 8-year overall survival rate after initial treatment, a 67.9% 5-year overall survival rate after prior SDS, and a 31.3% 5-year progression-free survival rate after prior SDS. Although the findings were not significant, these results suggest that repeated SDS might improve outcomes for this patient group. The present study may provide a platform for discussion of the impact of aggressive or repeated SDS on the survival of patients with recurrent epithelial ovarian cancer and favorable prognostic factors. Further multi-institutional studies with larger number of patients are mandatory to confirm the present findings.
    Journal of Obstetrics and Gynaecology Research 11/2013; 40(3). DOI:10.1111/jog.12222 · 0.93 Impact Factor
  • Y Kawano · M Nishida · K Kai · T Hirakawa · K Nasu · H Narahara
    Journal of Obstetrics and Gynaecology 11/2013; 33(8):914-5. DOI:10.3109/01443615.2013.830090 · 0.60 Impact Factor
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    Noriyuki Takai · Tami Ueda · Masakazu Nishida · Kaei Nasu · Hisashi Narahara
    Gynecologic Oncology 04/2013; 129(1):269. DOI:10.1016/j.ygyno.2012.09.023 · 3.69 Impact Factor
  • Kaei Nasu · Mamiko Okamoto · Masakazu Nishida · Hisashi Narahara
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    ABSTRACT: Endometriosis of the perineum and vulva is extremely rare, with the most common site being episiotomy scars. We report here a case of spontaneously developing perineal endometriosis successfully treated with local excision. A 39-year-old woman was admitted complaining of a painful vulvar lump with cyclic swelling. She had first noticed the mass 7 years before, and it had gradually increased in size. Gynecological examination showed a walnut-size, painful, subcutaneous mass in the left perineum. Magnetic resonance imaging revealed a multilobular cystic mass with inner hemorrhage, suggesting vulvar endometriosis. The patient was treated by local excision of the vulvar mass, and complete excision was achieved. The pathological diagnosis of the excised tissue was endometriosis. The patient is well without evidence of disease 5 months following the local excision. Spontaneous perineal and vulvar endometriosis is extremely rare. However, any lesion that evolves in response to the menstrual cycle should be considered endometriosis.
    Journal of Obstetrics and Gynaecology Research 03/2013; 39(5). DOI:10.1111/jog.12003 · 0.93 Impact Factor
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    ABSTRACT: The potential anticancer agent 1-(2-chlorophenyl-N-methylpropyl)-3-isoquinolinecarboxamide (PK11195), a translocator protein ligand (initially described as a ligand for the peripheral benzodiazepine receptor), induces apoptosis in some lines of human tumor cells. We investigated the effect of PK11195 in the choriocarcinoma cell line, BeWo. BeWo cells were treated with various concentrations of PK11195, and changes in cell growth, the cell cycle, apoptosis, and related parameters were examined. A WST-1 assay showed that BeWo cells were sensitive to the growth inhibitory effect of PK11195. In contrast, the nonsite selective ligand diazepam has a little effect on these cells. Cell cycle analysis indicated that exposure to PK11195 decreased the proportion of cells in the S phase and increased the proportion in the G0/G1 phases of the cell cycle. Induction of apoptosis was confirmed by Annexin V staining of externalized phosphatidylserine, by the loss of mitochondrial transmembrane potential, and by antibodies directed against histones from fragmented DNA. This induction occurred in conjunction with the altered expression of genes related to cell growth, malignant phenotype, and apoptosis. These results suggest that PK11195 may serve as a therapeutic agent for the treatment of choriocarcinoma.
    Tumor Biology 04/2012; 33(5):1505-10. DOI:10.1007/s13277-012-0401-8 · 3.61 Impact Factor
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    ABSTRACT: Meningeal metastasis is rare in the clinical course of ovarian carcinoma and its prognosis is extremely poor. We experienced a case of carcinomatous meningitis from metastatic ovarian small cell carcinoma. A 33-year-old woman with atypical genital bleeding, was diagnosed with a right ovarian tumor and referred to our department. She underwent a total abdominal hysterectomy, bilateral salpingo-oophorectomy, omentectomy, and lymphadenectomy. It was an optimal debulking surgery. She was diagnosed with ovarian carcinoma classified as Stage IIIc according to the Féderation Internationale de Gynécologie et d'Obstétrique classification system. Histological findings showed small cell carcinoma of the pulmonary type. The tumor was bilateral with paraaortic lymph node involvement. The patient was treated with irinotecan and cisplatin (CPT-P therapy). After 4 courses of CPT-P therapy, multiple liver metastases and Virchow's lymph node metastases were found. She was treated with amrubicin as a second-line chemotherapy, but the treatment was ineffective. Five months after surgery, the patient complained of severe headache and nausea. Lumbar puncture was performed and cytology was positive. Magnetic resonance brain imaging indicated meningeal thickening. The patient was diagnosed with meningeal metastasis and received 19-Gy whole cranial irradiation. In spite of these treatments, her disease progressed rapidly and she was often drowsy. She died of aspiration pneumonia 6 months after surgery.
    Rare tumors 04/2012; 4(2):e26. DOI:10.4081/rt.2012.e26
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    ABSTRACT: KN-93, a membrane-permeant calcium/calmodulin- dependent kinase-selective inhibitor, induces apoptosis in some lines of human tumor cells. We investigated the effect of KN-93 in the choriocarcinoma cell line, BeWo. BeWo cells were treated with various concentrations of KN-93, and changes in cell growth, the cell cycle, apoptosis, and related parameters were examined. A WST-1 assay showed that BeWo cells were sensitive to the growth inhibitory effect of KN-93. Cell cycle analysis indicated that exposure to KN-93 decreased the proportion of cells in the S phase and increased the proportion in the G0/G1 phases of the cell cycle. Induction of apoptosis was confirmed by Annexin V staining of externalized phosphatidylserine, by the loss of mitochondrial transmembrane potential, and by antibodies directed against histones from fragmented DNA. This induction occurred in conjunction with the altered expression of genes related to cell growth, malignant phenotype, and apoptosis. These results suggest that KN-93 may serve as a therapeutic agent for the treatment of choriocarcinoma.
    Tumor Biology 01/2012; 33(4):1053-8. DOI:10.1007/s13277-012-0339-x · 3.61 Impact Factor
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    ABSTRACT: Bufalin is a traditional oriental medicines which induces apoptosis in some lines of human tumor cells. It constitutes the major digoxin-like immunoreactive component of Chan Su, obtained from the skin and parotid venom glands of toads. Bufalin is cardioactive C-24 steroids that exhibits a variety of biological activities, such as cardiotonic, anaesthetic, blood pressure stimulatory, respiratory and antineoplastic effects. In terms of its anti-tumor activity, bufalin has been demonstrated to inhibit the growth of tumors, such as endometrial and ovarian cancers. This commentary introduces biologic and therapeutic effects of bufalin in treating some cancers. The compound is able to mediate inhibition of cell growth, cell cycle arrest, apoptosis, and expression of genes related to the malignant phenotype in human cancer cells.
    Asian Pacific journal of cancer prevention: APJCP 01/2012; 13(1):399-402. DOI:10.7314/APJCP.2012.13.1.399 · 2.51 Impact Factor
  • K Nasu · M Okamoto · M Nishida · N Takai · H Narahara
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    ABSTRACT: Primary malignant lymphoma of the vagina is extremely rare. The most common histologic subtype is diffuse large B-cell lymphoma (DLBCL). We report a case of vaginal DLBCL successfully treated with chemotherapy consisting of rituximab, adryamicin, cyclophosphamide, vincristine sulfate, and prednisolone (R-CHOP), followed by pelvic irradiation. A 44-year-old Japanese woman was admitted complaining of atypical genital bleeding and puruloid vaginal discharge. Gynecological examination showed an ulceration of the vaginal wall and a hard mass the size of a goose egg beneath the left vaginal wall, which had infiltrated to the left pelvic wall. The pathological diagnosis based on a punch biopsy taken from the vaginal tumor was non-Hodgkin's lymphoma. Based on immunohistochemical study, the tumor was subclassified as activated B-cell type DLBCL. The patient was diagnosed with Ann Arbor Stage IEA DLBCL and Stage III vaginal cancer, according to the International Federation of Gynecologists and Obstetricians (FIGO) classification system. She was successfully treated by six courses of R-CHOP, followed by radiation therapy. The patient is well without evidence of disease 13 months following the initial treatment. Little attention has been paid to the use of rituximab in addition to conventional chemotherapy and the importance of clinical and morphological subgrouping of DLBCL arising in the vagina. The present case indicates that the effects of rituximab on the prognosis of vaginal DLBCL must be evaluated, and that clinical use of immunophenotypic subgrouping should be considered for vaginal DLBCL.
    European journal of gynaecological oncology 01/2012; 33(2):219-22. · 0.60 Impact Factor
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    ABSTRACT: A membrane-targeted, lipophilic ether lipid of synthetic phospholipid analog, erucylphosphocholine (ErPC), induces apoptosis in some lines of human tumor cells. We investigated the effect of ErPC in the choriocarcinoma cell line, BeWo. BeWo cells were treated with various concentrations of ErPC, and changes in cell growth, the cell cycle, apoptosis, and related parameters were examined. A 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay showed that BeWo cells were sensitive to the growth inhibitory effect of ErPC. Cell cycle analysis indicated that exposure to ErPC decreased the proportion of cells in the S phase and increased the proportion in the G0/G1 phases of the cell cycle. Induction of apoptosis was confirmed by Annexin V staining of externalized phosphatidylserine and by the loss of mitochondrial transmembrane potential. This induction occurred in conjunction with the altered expression of genes related to cell growth, malignant phenotype, and apoptosis. These results suggest that ErPC may serve as a therapeutic agent for the treatment of choriocarcinoma.
    Tumor Biology 06/2011; 32(3):569-74. DOI:10.1007/s13277-010-0152-3 · 3.61 Impact Factor