PubMed Health⌕ Search

Biomedical subjects

Yasuhiko Tamada

Publications and source records attributed to Yasuhiko Tamada.

11 recordsLinked to original sources
PubMed2005

5-Aminolevulinic acid-based photodynamic therapy for the treatment of two patients with extramammary Paget's disease.

Photodynamic therapy (PDT), which employs a combination of a tumor-localizing photosensitizer and visible light, has been used in the treatment of extramammary Paget's disease (EMPD). Two patients with EMPD were treated with PDT using 5-aminolevulinic acid (ALA). Histologically, in both cases, Paget's cells were present within the epidermis. Case 1 was a 92-year-old male who underwent total extirpation for treatment of EMPD. Two topical ALA-PDT treatments were applied to parts of the lesions at a total dose of 200J/cm2. Case 2 was a 73-year-old female, whose lesions in the right labia majora were treated with 3 topical ALA-PDT sessions at a total dose of 300 J/cm2. Clinical findings after the irradiation showed improvement in both patients, and elimination of tumor cells in the epidermis was confirmed histologically. Case 1 had no recurrence in the irradiation field at three months after PDT. Case 2 had a recurrence only in the periphery parts of the lesions at two months after PDT, but the periphery lesions remitted with two more PDT treatments. Topical ALA-PDT is an effective treatment for EMPD with tumor cells within the epidermis. It is noninvasive and achieves a cosmetically excellent outcome, especially in elderly patients and those in poor general condition.

Aged↗
PubMed2005

Lymphoepithelioma-like carcinoma of the skin with potential for sweat glandular differentiation.

Lymphoepithelioma-like carcinoma of the skin (LELCS) is a cutaneous malignancy with histopathological resemblance to lymphoepithelioma of the nasopharynx. Its histogenesis remains unknown, and few cases showing skin appendage differentiation have been reported to date. We present the case of a 77-year-old Japanese male with an asymptomatic red nodule on his left cheek. Because the histopathological study revealed focal growth of tumor cells lacking connections with the epidermis and marked lymphocytic infiltration surrounding the neoplastic cell nests, the case was diagnosed as LELCS. On immunohistological staining, the neoplastic cells were positive for carcinoembryonic antigen (CEA), epithelial membrane antigen (EMA), multi-cytokeratin (CK), CK6, CK18, and CK19. On the basis of these results, we suggested that skin appendage differentiation, particularly sweat glandular differentiation, was present in this case.

Aged↗
PubMed2003

Analysis of gene mutations in three cases of dermatofibrosarcoma protuberans (DFSP): ordinary DFSP, DFSP with fibrosarcomatous lesion (DFSP-FS) and lung metastasis of DFSP-FS.

BACKGROUND: Fusion of the collagen type I alpha 1 (COL1A1) gene with the platelet-derived growth factor B-chain (PDGFB) gene has been pointed out in dermatofibrosarcoma protuberans (DFSP). Various exons of the COL1A1 gene have been shown to be involved in the fusion with exon 2 of the PDGFB gene. OBJECTIVE: We studied the breakpoints of the COL1A1 gene using the tumor specimens from three patients with DFSP. METHODS: Reverse transcriptase-polymerase chain reaction (PCR) was performed using cultured DFSP tumor cells or frozen tissue. Nucleotide sequence analysis was carried out using the PCR products to identify the breakpoints. RESULTS: Cases 1, 2 and 3 were diagnosed as ordinary DFSP, DFSP with fibrosarcomatous lesion (DFSP-FS) and lung metastasis of DFSP-FS, respectively. The COL1A1-PDGFB fusion transcripts were detected from the tumor specimens. Sequence analysis revealed that the ends of exons 42, 29 and 38 in the COL1A1 gene were fused with the start of exon 2 in the PDGFB gene in case 1, 2 and 3, respectively. CONCLUSION: This study identified a novel COL1A1 breakpoint, namely, exon 42 of the COL1A1 gene. Detection of the aberrant fusion transcript seems to be useful at differential diagnosis both in primary and metastatic lesions.

Adolescent↗
PubMed2003

Effectiveness of iontophoresis with alternating current (AC) in the treatment of patients with palmoplantar hyperhidrosis.

Conventionally, iontophoresis employing direct current (DC) has been used in the treatment of palmoplantar hyperhidrosis, but this is accompanied by side effects such as pain and burns. In the present study, a prototype apparatus using alternating current (AC) was constructed, and iontophoresis with AC was performed in palmoplantar hyperhidrosis patients to determine its effectiveness. The average amount of perspiration of the palmoplantar hyperhidrosis patients was significantly reduced after the third session when iontophoresis treatments were performed once per week. By the eighth treatment, perspiration was reduced to nearly the normal level, and there were no particular side-effects during the treatment period. This treatment therefore appears to be both safe and effective. The treatment effect tended to appear sooner when alternating current iontophoresis was combined with the administration of anticholinergic drugs than when alternating current iontophoresis was used alone. Alternating current iontophoresis is an effective treatment for palmoplantar hyperhidrosis. Guidelines for this treatment for patients with palmoplantar hyperhidrosis will need to be established in the future.

Adult↗
PubMed2002

A case of tufted hair folliculitis.

A 35-year-old man developed red papules and plaques with alopecia and hair tufts on the parietal and occipital areas of his scalp. Each tuft was comprised of 5 to 25 hairs arising from individual hair follicules. Histopathological findings showed a dense infiltration of plasma cells in the dermis. Based on these findings, he was diagnosed as tufted hair folliculitis. Oral minocycline and topical gentamicin were not effective, but the patient responded well to four weeks of oral refampicin.

Administration, Oral↗