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A subcutaneous tumor of a patient with epidermodysplasia verruciformis was studied by the light microscopy, the electronmicroscopy and the immunofluorescent test. The tumor cells were histologically pleomorphic and electronmicroscopically contained varying amounts of cytoplasmic filaments without Z-band formation. The antimyosin serum stained the tumor cells, showing their myogenic origin. No virus or virus-like particles were observed in the tumor. Tumor antigens stainable by the patient's serum were not detected. Hamsters inoculated with the tumor extract at birth developed no noticeable diseases.
Acta Medicinae Okayama
Okayama University Medical School