Tetsuo Hotta

Niigata University, Niahi-niigata, Niigata, Japan

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Publications (93)228.6 Total impact

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    ABSTRACT: Dedifferentiated chondrosarcoma is a rare, highly malignant variant of chondrosarcoma in which a high-grade sarcoma coexists with a low-grade chondroid tumor. We herein review a case of dedifferentiated chondrosarcoma with an osteosarcoma omit component that occurred in the distal femur of a 38-year-old man. We established the cell line (NDCS-1) from a pleural effusion of the metastatic lung tumor. The cell line was characterized by a the G-banded karyotype, polymerase chain reaction (PCR) single-strand conformation polymorphism analysis, spectral karyotyping, and reverse transcriptase PCR (RT-PCR). The tumor exhibited complex karyotypes and a high frequency of chromosomal amplication with p53 mutation. This tumor revealed an osteoblastic and chondroblastic character in vitro and in severe combined immunodeficiency mice. The expression and phosphorylation of platelet-derived growth factor receptor-beta, which seemed to play a major role in the malignant phenotype of chondrosarcoma, was confirmed by RT-PCR and Western blotting. To our knowledge, this is the first report of the establishment of a human dedifferentiated chondrosarcoma.
    Archiv für Pathologische Anatomie und Physiologie und für Klinische Medicin 10/2007; 451(3):691-9. · 2.68 Impact Factor
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    ABSTRACT: We report on a case of a solitary fibrous tumor that developed in the thigh of an 82-year-old woman. The tumor was composed of areas of high-grade sarcoma and typical solitary fibrous tumor. Its karyotype was: 70,XXX,+X[4],+1[2],add(1)(p36)[4],add(1)[2],+2[4],-3[4],+6[4],add(6)(p11)x2[4],+7[4],+9[3],-11[4],-12[4],-13[4],add(13)(p11)x2[4],-14[4],+15[4],-16[3],-17[4],-19[4],+20,[4],+21[4],+22[2],+mar1x2[4][cp4].
    Cancer Genetics and Cytogenetics 09/2007; 177(1):55-8. · 1.93 Impact Factor
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    ABSTRACT: Ossifying fibromyxoid tumor (OFMT) is a rare but morphologically distinctive soft-tissue tumor. The histologic origin of this tumor is not clearly known, but its various features suggest a schwannian, neuronal, or chondroid origin. We herein report a case of a typical OFMT that occurred in the shoulder of a 65-year-old man. The karyotype exhibited the following complex numeric and structural aberrations: 42 approximately 46,XY,-Y,add(1)(q42),add(6)(p21),t(10;18)(q26;q11),der(11)t(11;15)(q23;q15),add(12)(q13),ins(14;?)(q13;?),-15,+mar. Combined with several previously reported studies, these aberrations could not identify a common cytogenetic abnormality in OFMT.
    Cancer genetics and cytogenetics 08/2007; 176(2):156-60. · 1.54 Impact Factor
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    ABSTRACT: Malignant peripheral nerve sheath tumor (MPNST) is a relatively rare soft tissue tumor, and its clinical relevance of pathological grades remains obscure. Fifty-six cases of MPNST identified from the files of seven oncology centers of the Tohoku Musculoskeletal Tumor Society (TMTS) and National Cancer Center were analyzed for histologic grades, demographics, treatments, and prognostic factors. The average follow-up period was 41 months. Twenty-two men and 34 women with a mean age of 45 years were involved. Forty-four (78.6%) of 56 tumors were in the lower extremity or trunk. Fifty tumors (89%) were classified as high grade, and the remaining six as low grade. Twenty-one (39.6%) of 53 patients who underwent tumor excision developed local recurrences. An axial site and inadequate surgical margin were defined as risk factors for local recurrence. The overall survival rates of the 56 patients were 55.1% at 3 years and 43.3% at 5 years. Univariate analysis of the 56 patients revealed large-sized tumors, metastasis at presentation, and histologically high grade were significantly associated with poor prognosis. Multivariate analysis revealed a large tumor and metastasis at presentation to be independent prognostic factors. The current study involving 56 patients with MPNST showed the aggressive clinical behavior of the tumor. Large-sized tumors, metastasis at presentation, and high histological grade were related to poor prognosis on univariate analysis, but independency of histological grade was still obscure. In the treatment for a large and high-grade MPNST, an alternative strategy should be further considered.
    Annals of Surgical Oncology 03/2007; 14(2):597-604. · 4.12 Impact Factor
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    ABSTRACT: Description of surgical technique and retrospective review of 13 cases. To describe the surgical technique of margin-free spondylectomy and the outcome of 13 cases and to discuss the advantages and limitations of the procedure. Recently, spondylectomy became a standard procedure by several pioneers. For extended malignant spine tumors involving pedicles or epidural space, however, performing an "en bloc" resection with a tumor-free margin remains a challenge. Our procedure consists of a combined anterior and posterior procedure with one or two stages. In the anterior procedure, tumor vertebrae are covered by the pleura or psoas muscles as a barrier. The posterior procedure includes decompression through the intact posterior elements, coverage of the tumor with all possible soft tissue barriers, and en bloc extirpation by rotating the tumor vertebrae around the spinal cord. We performed this procedure in 13 cases: 3 chondrosarcoma, 3 giant cell tumor, 1 osteosarcoma, 1 chordoma, and 5 metastases. Neurologic status and pain improved in all cases except asymptomatic cases. There was no local recurrence, except in 2 cases (chondrosarcoma with extirpation of 5 vertebrae, chordoma with multiple previous surgeries). Two cases of chondrosarcoma were disease-free 14 years and 13 years after surgery, respectively. Although the best chance for a cure in extended malignant tumors of the spine is realized through wide resection, the procedure is not yet standardized. Margin-free spondylectomy is technically demanding, but the procedure can be used with a confidence as a more radical surgery for tumors extending to the epidural space and the unilateral pedicle. A key to success is the surgical technique, including a 360 degree dissection around the tumor vertebrae, instrumentation, and removal of the lesion with all possible soft tissues maintained intact to function as a barrier, like the dura mater.
    Spine 02/2007; 32(1):142-8. · 2.16 Impact Factor
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    ABSTRACT: Despite its benign nature, a ganglion can be problematic. We successfully treated a patient with large painful ganglion in his ankle by OK-432 (lyophilized incubation mixture of group A Streptococcus pyogenes of human origin) injection. OK-432 injection seems to be a safe, convenient, and effective alternative to surgical treatment for either symptomatic or recurrent ganglia.
    Modern Rheumatology 02/2007; 17(4):341-3. · 1.72 Impact Factor
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    ABSTRACT: Prominent osteoconductive activity and the biodegradable nature of commercially available beta-tricalcium phosphate (beta-TCP, OSferion) have been documented in animal experiments. We analyzed four cases of involving grafted OSferion in human bone with respect to histological features by routine hematoxylin and eosin staining, silver impregnation, immunohistochemistry and in situ hybridization. OSferion affords early bioresorption by osteoclasts, vascular invasion of macropores and osteoblastic cell attachment on the surface on the ceramic surface 14 days after grafting. Prominent bone formation and direct bone connection between preexisting bone and OSferion were evident 28 days after grafting. Nearly the entire TCP surface was covered by lamellar bone; additionally, active osteoblastic lining and attachment of the osteoclast-like giant cells were not observed 72 weeks after grafting. Silver impregnation revealed the presence of collagen fibrils within probable micropores of OSferion.
    Biomaterials 04/2006; 27(8):1542-9. · 8.31 Impact Factor
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    ABSTRACT: The present investigation examined the effect of bisphosphonates on six mesenchymal tumor cell lines and the mechanisms of inhibition of tumor cell proliferation. HT-1080, a fibrosarcoma cell line that exhibits increased Ras activity due to a mutation of the Ras gene, demonstrated significantly reduced tumor cell proliferation upon treatment with incadronate. The other cell lines, however, which lack mutation of the Ras gene, showed no influence upon treatment with incadronate. Autoradiography demonstrated no difference in the uptake of 3H-labelled incadronate between susceptible and unaffected cells. The anti-proliferation of HT-1080 was reversed by the addition of geranylgeranyl pyrophosphate. Etidronate exhibited no influence on all tested cell lines. On the basis of these data, we hypothesized that incadronate inhibits the mevalonate pathway and blocks oncogenic Ras signaling. In an effort to confirm this hypothesis, the influence of incadronate on an oncogenic Ras transfected BALB/3T3 cell line (Bhas 42) and a parental BALB/3T3 cell line were compared. The parental BALB/3T3 cells showed slight inhibition upon treatment with incadronate, however, the proliferation of Bhas 42 cells was significantly reduced. These results suggest that incadronate suppresses oncogenic Ras-activated mesenchymal tumors through the inhibition of Ras signaling pathways.
    Journal of experimental & clinical cancer research: CR 12/2005; 24(4):617-24. · 1.50 Impact Factor
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    ABSTRACT: We report a case of successful control of the infection of megaprosthesis in the distal femur. Deep infection occurred 5 years after the resection of the osteosarcoma and reconstruction with cementless megaprosthesis. Multiple debridement and intravenous administration of antibiotics did not eradicate the infection. He developed aortitis syndrome (Takayasu's arteritis) and needed to undergo steroid therapy. Total removal of the prosthesis achieved good control of the infection, and the patient had started prednisolone therapy. The patient can walk alone with an ischial weight-bearing brace. Removal of the endoprosthesis and application of ischial weight-bearing brace may be a possible option for the treatment of infected megaprosthesis.
    The Journal of Arthroplasty 11/2005; 20(7):954-6. · 2.11 Impact Factor
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    ABSTRACT: This report describes a case of congenital dermatofibrosarcoma protuberans (DFSP) with fibrosarcomatous (FS) and myxoid areas. Immunohistochemical results showed that tumour cells in ordinary DFSP areas were diffusely positive for CD34, whereas in the FS and myxoid areas, few tumour cells were positive for this antigen. Ki-67 positive tumour cell numbers were greater in the FS (11.8%) and myxoid areas (19.8%) relative to ordinary DFSP areas (2.2%). Reverse transcription polymerase chain reaction and sequence analysis showed the presence of an identical COL1A1-PDGFB fusion transcript in ordinary DFSP (plaque-like area), FS, and myxoid areas of DFSP. These results indicate that the three components of DFSP have a common histogenesis. This study documents the first application of gene analysis involving the myxoid area of DFSP.
    Journal of Clinical Pathology 10/2005; 58(9):984-6. · 2.44 Impact Factor
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    ABSTRACT: We established a novel human myxofibrosarcoma cell line NMFH-1 and analyzed it with spectral karyotyping and comparative genomic hybridization (CGH). NMFH-1 cells are composed of two different types of cells, small, spindle-shaped mononuclear cells and bizarre multinucleated giant cells, which were maintained in vitro over 200 passages. Xenografted tumor showed typical features of myxofibrosarcoma, which included bizarre multinucleated giant cells. Cytogenetic analyses revealed complex abnormalities, including a t(17;22)(q2?2;q13), which has been found in dermatofibrosarcoma protuberans. Subsequent reverse-transcription polymerase chain reaction revealed that the cell line did not have the COL1A1-PDGFB gene fusion. Significant gains of the 1q12 approximately q23 and 8q13 approximately qter regions and loss of the 9p21 approximately pter and 13q12 regions often found in MFH were observed by CGH analysis. We investigated the origin of multinucleated giant cells in xenografted tumor through DNA in situ hybridization. In this system, the human-specific Alu sequence and the mouse L1 sequence were used as specific cell markers of identity. In situ hybridization revealed neoplastic proliferation of the multinucleated giant cells of human origin.
    Cancer Genetics and Cytogenetics 09/2005; 161(1):28-35. · 1.93 Impact Factor
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    ABSTRACT: We examined osteochondral autografts, obtained at a mean of 19.5 months (3 to 48) following extracorporeal irradiation and re-implantation to replace bone defects after removal of tumours. The specimens were obtained from six patients (mean age 13.3 years (10 to 18)) and consisted of articular cartilage (five), subchondral bone (five), external callus (one) and tendon (one). The tumour cells in the grafts were eradicated by a single radiation dose of 60 Gy. In three cartilage specimens, viable chondrocytes were detected. The survival of chondrocytes was confirmed with S-100 protein staining. Three specimens from the subchondral region and a tendon displayed features of regeneration. Callus was seen at the junction between host and irradiated bone.
    Journal of Bone and Joint Surgery - British Volume 08/2005; 87(7):1006-11. · 2.69 Impact Factor
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    Journal of Clinical Oncology 07/2005; 23(16):3847-8. · 18.04 Impact Factor
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    ABSTRACT: Germline mutation and functional loss of EXT1 or EXT2 are commonly found in multiple osteochondromas and predispose to the development of chondrosarcoma. Mutations of EXT1 and EXT2 have rarely been detected in sporadic secondary chondrosarcomas from osteochondroma; these frequently display loss of heterozygosity at the EXT1 and EXT2 loci, but primary chondrosarcomas typically do not. To evaluate promoter methylation (which is an epigenetic gene silencing mechanism) of EXT1 and EXT2, we performed methylation-specific polymerase chain reaction (PCR) for 20 chondrosarcoma cases (12 primary, 3 secondary to osteochondroma, 2 secondary to enchondromatosis, 2 extraskeletal ordinary, and 1 clear cell) and in five cell lines. In addition, mutation analysis of the EXT1 and EXT2 coding regions was performed using PCR-single-strand conformation polymorphism and sequencing analysis for 12 of the 20 chondrosarcoma cases (8 primary, 1 secondary to enchondromatosis, 1 secondary to osteochondroma, and 2 extraskeletal ordinary) and five cell lines. Promoter methylation of EXT1 and EXT2 was not detected in any of the cases, and both EXT1 and EXT2 were expressed in all cell lines. Two missense mutations in EXT2 (D227E and R299H) were detected among the chondrosarcoma cases. When considering tumor development in primary chondrosarcoma, we should include mutations in EXT2, along with the status of other members of the EXT gene family.
    Cancer Genetics and Cytogenetics 05/2005; 158(2):148-55. · 1.93 Impact Factor
  • Clinical Cancer Research 04/2005; 11(6):2445-7; author reply 2447-8. · 7.84 Impact Factor
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    ABSTRACT: We describe two patients with a diffuse haemangioma of the lower limb complicated by pathological fracture of the femoral shaft, one of whom was treated by a bone graft and immobilisation in a cast, and the other by external fixation and injection of bone marrow. A review of the literature identified difficulty in control of bleeding and obtaining bony union.
    Journal of Bone and Joint Surgery - British Volume 04/2005; 87(3):412-4. · 2.69 Impact Factor
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    ABSTRACT: Long-term results are reported in 23 patients and short-term results in 30 patients presenting with bone tumors treated by curettage or resection followed by implantation of hydroxyapatite (HA) or highly purified beta-tricalcium phosphate (beta-TCP), respectively. Mean follow-up was 97 and 26 months in cases involving HA implantation and beta-TCP implantation, respectively. Radiographs revealed HA incorporation into host bone in all but two cases; moreover, no obvious evidence of HA biodegradation was observed. A single patient exhibited late deformity following implantation of HA. All grafted beta-TCP was, at least partially, absorbed and replaced by newly formed bone. The mean period required for the disappearance of radiolucent zones between the ceramics and host bone was 17 weeks in HA and 9.7 weeks in beta-TCP. Highly purified beta-TCP appears to be advantageous relative to HA for surgical intervention in bone tumors consequent to the nature of remodeling and superior osteoconductivity.
    Journal of Biomedical Materials Research Part B Applied Biomaterials 02/2005; 72(1):94-101. · 2.31 Impact Factor
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    ABSTRACT: Sclerosing epithelioid fibrosarcoma is a recently described, rare mesenchymal neoplasm. We report a case of sclerosing epithelioid fibrosarcoma that occurred in the lower leg of a 48-year-old man. The karyotype of the tumor exhibited der(1)t(1;10)(p31;p11), der(10)t(10;17)(p11;q11), and der(17) t(11;17)(?;q11). Rearrangement of 10p11 was also found in one previous reported case of this uncommon tumor.
    Cancer Genetics and Cytogenetics 08/2004; 152(2):136-40. · 1.93 Impact Factor
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    ABSTRACT: To distinguish between benign and malignant peripheral nerve sheath tumors around the pelvis. A retrospective study of 30 patients with benign and malignant peripheral nerve sheath tumors located around the pelvis was performed. Clinical, imaging and histological features of 19 benign and 11 malignant peripheral nerve sheath tumors around the pelvis were reviewed retrospectively. Nearly all patients exhibited pain at presentation in cases involving both benign and malignant tumors. Although tumor size, duration of symptoms and presence of sensory disturbance possessed little value in differential diagnosis, severe motor weakness was observed exclusively in patients presenting with malignant tumors. On CT or MRI, central enhancement was apparent in 11 of the 19 benign tumors; in contrast, central enhancement was evident in one of the 11 malignant tumors. Fine needle aspiration cytology was performed in 11 tumors; correct diagnosis was achieved in four tumors. Core needle biopsy was performed in five tumors, all of which were correctly diagnosed with no neurological deficits. Immunohistochemically, all benign tumors were diffusely positive for S-100 protein, whereas malignant tumors were negative or focally positive for S-100 protein. Ki-67 index was less than 4% in all benign tumors; additionally, this index was 7-36% in malignant tumors. Central enhancement pattern on imaging studies strongly suggests a benign tumor; in contrast, severe motor weakness suggests malignant lesions. Core needle biopsy was reliable with respect to preoperative diagnosis.
    Japanese Journal of Clinical Oncology 08/2004; 34(7):405-13. · 1.90 Impact Factor
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    ABSTRACT: Case report. To report primary angiosarcoma of the T8 vertebra, which was successfully managed with en bloc spondylectomy and postoperative chemotherapy. To the best of our knowledge, the present case is the first documented example of successful treatment of angiosarcoma of the spine. Angiosarcoma of the eighth thoracic vertebra was diagnosed in a 48-year-old man with impending neurologic deficit. Imaging findings revealed a nonspecific high-grade lesion. A total spondylectomy of T8 by en bloc resection was performed. The defect of the vertebral body was reconstructed with a apatite-wollastonite glass ceramic prosthesis; moreover, the T6-T10 vertebrae were instrumented by the pedicle screw, hook and rod system. The histologic diagnosis of the excised specimen was high-grade angiosarcoma. Postoperative chemotherapy was implemented to prevent local recurrence and distant metastasis. No sign of local recurrence or metastasis was evident 5 years after surgery. This case is the first documented example of successful treatment of angiosarcoma of the thoracic spine. Radiologic findings were nonspecific; consequently, correct diagnosis was established by pathologic examination. Immediate, aggressive operative treatment and postoperative adjuvant chemotherapy afforded a satisfactory outcome.
    Spine 08/2004; 29(13):E280-3. · 2.16 Impact Factor

Publication Stats

832 Citations
228.60 Total Impact Points

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Institutions

  • 1992–2014
    • Niigata University
      • Division of Orthopedic Surgery
      Niahi-niigata, Niigata, Japan
  • 1998–2010
    • Niigata Cancer Center Hospital
      Niahi-niigata, Niigata, Japan
  • 2009
    • Osaka City University
      • Department of Orthopaedic Surgery
      Ōsaka-shi, Osaka-fu, Japan
  • 1995
    • Hamamatsu University School of Medicine
      • Department of Orthopedic Surgery
      Hamamatu, Shizuoka, Japan