Masahito Yasuda

Gunma University, Maebashi, Gunma, Japan

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Publications (20)39.68 Total impact

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    ABSTRACT: Recent studies cite β2-adrenergic receptor (β2AR) antagonists as novel therapeutic agents for melanoma, as they may reduce the disease progression. The β2AR has shown to be expressed in malignant melanoma. However, it remains unclear whether the β2AR expression has a clinical and pathological significance in patients with cutaneous malignant melanoma. We herein conducted a clinicopathological study to investigate the protein expression of β2AR in malignant melanoma of the skin and its prognostic significance. One hundred thirty-three patients with surgically resected cutaneous malignant melanoma were evaluated. Tumor sections were stained by immunohistochemistry for β2AR, Ki-67, the microvessel density (MVD) determined by CD34, and p53. β2AR was highly expressed in 44.4 % (59 out of 133) of the patients. The expression of β2AR was significantly associated with the tumor thickness, ulceration, T factor, N factor, disease stage, tumor size, cell proliferation (Ki-67), and MVD (CD34). Using Spearman's rank test, the β2AR expression was correlated with Ki-67 (r = 0.278; 95 % CI, 0.108 to 0.432; P = 0.001), CD34 (r = 0.445; 95 %CI, 0.293 to 0.575; P < 0.001), and the tumor size (r = 0.226; 95 % CI, 0.053 to 0.386; P = 0.008). Using a univariate analysis, the tumor thickness, ulceration, disease stage, β2AR, Ki-67, and CD34 had a significant relationship with the overall and progression-free survivals. A multivariable analysis confirmed that β2AR was an independent prognostic factor for predicting a poor overall survival (HR 1.730; 95 % CI 1.221-2.515) and progression-free survival (HR 1.576; 95 % CI 1.176-2.143) of malignant melanoma of the skin. β2AR can serve as a promising prognostic factor for predicting a worse outcome after surgical treatment and may play an important role in the development and aggressiveness of malignant melanoma.
    No preview · Article · Nov 2015 · Tumor Biology
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    ABSTRACT: Class III β-tubulin (TUBB3) has been recognized as being associated with resistance to taxane-based regimens in several cancers. However, little is known about the clinicopathological significance of TUBB3 expression in patients with cutaneous malignant melanoma. The aim of this study was to examine the prognostic significance of TUBB3 expression in cutaneous malignant melanoma. A total of 106 patients with surgically resected cutaneous malignant melanoma were assessed. Tumour sections were immunohistochemically stained for TUBB3, Ki-67 and microvessel density with CD34. TUBB3 was highly expressed in 80% (85/106) of patients. No statistically significant relationship was observed between the high expression of TUBB3 and any variables. On univariate analysis, ulceration, disease stage, TUBB3 and CD34 revealed a significant relationship with overall survival and progression-free survival. Multivariate analysis confirmed that a low TUBB3 expression was an independent prognostic factor for poor prognosis of cutaneous malignant melanoma. The decreased expression of TUBB3 could be a significant marker for predicting unfavourable prognosis in patients with cutaneous malignant melanoma.
    No preview · Article · Oct 2015 · Melanoma research
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    ABSTRACT: Dermatofibrosarcoma protuberans (DFSP) is a rare skin cancer that develops in the deep dermis to subcutaneous adipose tissues. A COL1A1-PDGFB gene fusion, leading to the constitutive expression of PDGFB, is the tumorigenic mechanism in most DFSP cases. To evaluate the specificity of PDGFB expression as a diagnostic marker of DFSP and to determine whether other pathomechanisms (ie, gene fusions) exist in patients with DFSP without the COL1A1-PDGFB fusion gene. All patients with DFSP registered in the pathologic database of the University of the Ryukyus from January 1, 1997, through December 31, 2013, and Gunma University from January 1, 1996, through December 31, 2011, were included in this analysis. Samples were obtained from 30 patients presenting with DFSP tumors. We examined the clinicopathologic characteristics and the expression of PDGFB, PDGFRβ, PDGFRα, CD34, nestin, factor XIIIa, fibronectin, α-smooth muscle actin, S-100 protein, and Ki-67 in 30 DFSP cases and 48 non-DFSP mesenchymal tumor cases by immunohistochemical analysis. We then analyzed tumor tissues for the presence of the COL1A1-PDGFB fusion gene. We also tested whether other genes enriched in fibroblasts formed fusion products with PDGFB by reverse transcription-polymerase chain reaction analysis, using gene-specific primers. We aimed to analyze tumor tissues for the presence of the COL1A1-PDGFB fusion gene to investigate expression of PDGFB in DFSP tumors. PDGFB expression was detected in 28 (93%) of 30 patients with DFSP. PDGFB was not homogenously expressed in DFSP tumor cells, whereas CD34 and nestin were often expressed throughout the tumor mass. In 1 DFSP tumor, the COL1A1-PDGFB fusion gene was not detected even though PDGFB was expressed. We identified a novel COL1A2-PDGFB fusion gene in this tumor. Our findings indicate that PDGFB protein is expressed in most DFSP tumors and may be a useful diagnostic tool when used in conjunction with CD34 and nestin expression analysis. These PDGFB expression data, in addition to our discovery of a novel PDGF fusion gene, strongly support the concept that DFSP is a PDGFB-dependent tumor type.
    No preview · Article · Sep 2015
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    ABSTRACT: Amino acid transporters play a crucial role in the development and invasiveness of cancer cells. However, it remains unclear whether or not the expression of L-type amino acid transporter 1 (LAT1) has prognostic significance in patients with cutaneous melanoma. A total of 128 patients with cutaneous melanoma were evaluated. Tumor sections were stained by immunohistochemistry for LAT1, CD98, Ki-67, and microvessel density determined by CD34 and p53. We also analyzed 30 specimens of patients with melanocytic nevi as negative controls. LAT1 and CD98 were highly expressed in 58% (75/128) and 75% (97/128), respectively. The rates of positivity for LAT1 in the melanocytic nevi were 0% (0/30). The expression of LAT1 was associated significantly with tumor thickness, T factor, CD98 expression, cell proliferation (Ki-67), and microvessel density (CD34). By Spearman's rank test, LAT1 expression was correlated with CD98, Ki-67, and CD34. By univariate analysis, tumor thickness, ulceration, disease staging, LAT1, and CD34 showed a significant relationship with overall survival and disease-free survival. Furthermore, a multivariate analysis confirmed that LAT1 was an independent prognostic factor for predicting a poor prognosis. This study had a small sample size. LAT1 can serve as a significant prognostic factor to predict a poor outcome and it may therefore play an important role in the aggressiveness of cutaneous melanoma.
    No preview · Article · Jul 2015 · Melanoma research

  • No preview · Article · May 2015 · The Journal of Dermatology
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    Preview · Article · Jan 2015 · Acta Dermato Venereologica

  • No preview · Article · Nov 2014 · Australasian Journal of Dermatology
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    ABSTRACT: Giant condyloma acuminatum (GCA) is a cauliflower-like condyloma acuminatum. Low-risk human papillomavirus (HPV) infection, such as that of HPV types 6 or 11, is associated with the disease (1). HPV type 56 is a high-risk HPV type that is sometimes detected in skin tumours (2). In particular, nail Bowen's disease presenting with longitudinal melanonychia has been reported to be frequently associated with HPV type 56 (2-4). We herein report a case of multiple giant condylomata acuminata in the groin and scrotum caused by high-risk HPV type 56 infection.
    No preview · Article · Nov 2013 · Acta Dermato-Venereologica

  • No preview · Article · Feb 2013 · Journal of Dermatological Science
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    Preview · Article · Jan 2011 · The Journal of Dermatology

  • No preview · Article · May 2010 · European journal of dermatology: EJD
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    ABSTRACT: Arteriovenous malformation (AVM) is a structural vascular abnormality with no proliferation of cellular components. We report on a 53-year-old man who presented with a 15-year history of a progressively enlarging nodule on his lower lip. A dark-reddish, easy-bleeding nodule diagnosed as AVM was resected to reduce the volume and troublesome bleeding. Histologically, the nodule revealed that the proliferating cellular area was composed of endothelial cells and pericytes in addition to the area of dilated vessels. We speculated that the cell proliferation developed secondary to AVM. We also discuss the histological differential diagnosis of spindle cell hemangioma and pseudo-Kaposi's sarcoma.
    No preview · Article · Apr 2010 · The Journal of Dermatology
  • Etsuko Okada · Masahito Yasuda · Atsushi Tamura · Osamu Ishikawa
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    ABSTRACT: Background: Dermatofibrosarcoma protuberans (DFSP) is an uncommon infiltrative tumor of the dermis and subcutaneous tissue. Recent cytogenetic studies have demonstrated a chromosomal trans-location of the collagen type I alpha 1 (COL1A1) gene on chromosome 17 to the platelet-derived growth factor B-chain (PDGFB) gene on chromosome 22. Various exons of the COL1A1 gene have been reported to be involved in the fusion with exon 2 of the PDGFB gene. Method: The COL1A1-PDGFB fusion transcript was detected by reverse transcriptase-polymerase chain reaction (RT-PCR) using frozen tissue from 4 DFSP patients. Nucleotide sequence analyses were carried out using the PCR products to identify the breakpoints. Results: COL1A1-PDGFB fusion transcripts were detected in all tumor specimens. Sequence analyses revealed that the end of exon 25, 45, 32, or 11 in the COL1A1 gene was fused with the start of exon 2 in the PDGFB gene. Conclusion: Detection of this aberrant fusion transcript can be useful as a diagnostic method for DFSP.
    No preview · Article · Sep 2009 · The Kitakanto Medical Journal
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    ABSTRACT: Digital ulcers and gangrene are common skin manifestations of connective tissue diseases, especially systemic sclerosis, although they are relatively rare in systemic lupus erythematosus. We describe here three patients with digital gangrene and systemic lupus erythematosus. None of the patients showed high disease activity of systemic lupus erythematosus at the time the digital gangrene developed. Two patients were positive for anti-RNP antibodies; however, no symptoms of other collagen diseases were present. One patient had anti-phosphatidylserine/prothrombin complex antibodies, and the other had anti-cardiolipin beta2 glycoprotein I antibodies and lupus anticoagulant at low titre. All patients showed narrowing or occlusion of radial and/or ulnar arteries in addition to digital arteries. Although a complication of anti-phospholipid syndrome is considered to be a possible cause, there may be unidentified causes other than thrombosis, atherosclerosis, overlap syndrome and vasculitis.
    No preview · Article · Feb 2009 · Acta Dermato-Venereologica
  • M Yasuda · Y Miyachi · A Utani
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    ABSTRACT: We report two cases of dyshidrosiform pemphigoid (DP) with different presentations. One patient was a 65-year-old Japanese man, who had been diagnosed with dyshidrosis and had been treated before visiting our hospital. When we stopped all treatments, the vesicles increased and spread to the trunk and limbs. We made a diagnosis of vesicular pemphigoid (VP) that was concomitant with or transformed from DP. Using Western blotting, the sera reacted with antigens with molecular weights of 60 and 180 kDa. The 60-kDa antigen has not been found previously in the sera of patients with VP. The other patient was a 94-year-old Japanese woman, who presented with redness and swelling with bullae on the palmoplantar areas. Five days later, areas of oedematous erythema, as seen in prototypical bullous pemphigoid (BP), developed on the limbs. Study of the distribution of the BP antigen may elucidate the mechanisms involved in localized forms of BP such as DP.
    No preview · Article · Feb 2009 · Clinical and Experimental Dermatology
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    No preview · Article · Aug 2008 · Dermatology
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    ABSTRACT: We report a 58-year-old man with mycosis fungoides (MF) and occupational systemic sclerosis (SSc) induced by silica exposure. He was engaged in tunnel construction from the age of 18 to 33 years. He developed MF at the age of 30. Diagnosis of silicosis was made at the age of 52 and SSc at the age of 58. Physical examinations revealed sclerotic skin changes on his forearms and fingers and poikiloderma on the left popliteal fossa and inguinal region. Both antinuclear antibody and antitopoisomerase-I antibody were positive. We could find no apparent difference between his clinical features and those of idiopathic SSc except for the presence of silicosis and MF. Systemic therapy with interferon-gamma for MF did not improve the skin sclerosis. We discuss the relationship of silica exposure to both MF and SSc.
    No preview · Article · Feb 2008 · The Journal of Dermatology
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    ABSTRACT: Bowen's disease developing on mucous or mucocutaneous regions is clinically called erythroplasia of Queyrat. We report herein a 56-year-old male with Bowen's disease extending from the penis shaft to the glans penis, and urethral meatus. Physical examination revealed bright red velvety plaques on the prepuce and glans penis and an irregularly pigmented scaly lesion on the dorsum of his penis shaft. Histopathological findings of both lesions were compatible with those of Bowen's disease, supporting the concept that erythroplasia of Queyrat and Bowen's disease should be regarded as one clinicopathologic entity. A partial penectomy was finally performed, because tumor cells were pathologically observed in the mucous epithelium of the urethra. Although several therapeutic modalities exist for Bowen's disease on the external genitalia, treatment options are limited when Bowen's disease extends to the urethral meatus. We discussed the recent therapeutic modalities in genital Bowen's disease.
    No preview · Article · Apr 2005 · The Journal of Dermatology
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    ABSTRACT: We report two cases of Werner's syndrome (WS). First, a 42-year-old Japanese man was referred on suspicion of systemic sclerosis (SSc) because of scleroderma-like skin atrophy and foot ulcers. Second, a 51-year-old woman with malignant fibrous histiocytoma was referred on suspicion of premature aging syndrome. Because both patients had many typical manifestations compatible with WS, we made a clinical diagnosis of WS. Genetic analyses revealed a homozygous mutation, an A deletion at nucleotide 3677 of WS gene (WRN) in the first case and a homozygous mutation, a G to C substitution at one base upstream of exon 26 of WRN in the second case. Both mutations were consistent with those previously reported in Japanese WS patients.
    No preview · Article · Nov 2004 · European journal of dermatology: EJD
  • Masahito Yasuda · Masatoshi Abe · Atsushi Tamura · Osamu Ishikawa
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    ABSTRACT: We report a case of idiopathic acquired anhidrosis successfully treated with steroid pulse therapy. A 21-year-old Japanese man noted the lack of sweating except palms, soles, forehead, upper chest, axillae, and external genital region. The affected skin appeared dry without peculiar skin changes. No abnormalities were seen in routine laboratory tests including serum IgE level, autoantibodies, neurological tests, or endocrinologic studies. No sweating was induced by high temperature at 40 degrees for 15 minutes or by intradermal injection of pilocarpine. Histopathological features of the affected skin showed a slight mononuclear infiltrate around the eccrine glands without degeneration of secretary components. Immunohistochemical studies demonstrated CD-4 positive cells dominantly infiltrating around the eccrine glands. After 2 courses of methylprednisolone pulse treatment, sweating was almost completely restored to his entire body.
    No preview · Article · Nov 2002 · The Kitakanto Medical Journal