Abstract
Summary
When RSV was inoculated into chicks pretreated with large doses of hydrocortisone the tumors appeared later and were greatly altered in appearance. These altered tumors were sharply circumscribed, firm, whitish and grew more slowly than control tumors. When hydrocortisone was discontinued the altered tumors promptly reverted to typically soft and invasive tumors. When lower doses of hydrocortisone were employed or when injections of hydrocortisone were begun after inoculation of RSV the tumors which appeared were typically invasive and grew more rapidly than the controls.
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