{'fraction_non_alphanumeric': 0.014002333722287048, 'fraction_numerical': 0.005834305717619603, 'mean_word_length': 5.975609756097561, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
A transmissible feline fibrosarcoma of viral origin.

Summary Histological examination of an invasive neoplasm from an 18-month-old female domestic shorthair cat revealed it to be a pleomorphic fibrosarcoma that ranged in microscopic appearance from well-differentiated collagenous connective tissue to anaplastic sarcomatous tissue that infiltrated surrounding musculature and skin. The fibrosarcoma was transmitted by whole cells or cell-free preparations to 8 to 10 neonatal kittens. The original neoplasm and the induced fibrosarcomas that were examined electron microscopically contained mature and budding C-type particles. Immunodiffusion studies with serum prepared in rabbits against purified ether-disrupted feline leukemia virus revealed identity between the feline leukemia virus group-specific antigen and extracts of the original fibrosarcoma.