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Propagation in Human Cells of a Filterable Agent from the ST Feline Sarcoma

Nineteen lines of human fibroblasts were inoculated with a filtrate prepared from the ST feline sarcoma. Seven lines showed morphological alteration and released focus-forming activity for feline cells, 2 lines showed morphological alteration but did not release focus-forming activity, and 11 lines showed no morphological alteration and released no focus-forming agent. Morphologically altered cells appeared enlarged, hyper-refractile, and intensely stained by hematoxylin. They neither assumed a crisscross pattern nor piled up to form a visible focus. Time-lapse cinegraph showed that the morphologically altered cells did not divide and were motile. The fluid from two human fibroblast cultures, inoculated 4 and 14 weeks previously with the ST sarcoma filtrate, induced fibrosarcoma in newborn kittens.