Spontaneous Vascular Neoplasms in Aged Sprague-Dawley Rats
Primary benign and malignant vascular neoplasms occurred spontaneously in 8 of 710 male (1.1%) and 4 of 710 female (0.6%) CrI:CD®Br strain Sprague-Dawley rats employed in two 2-yr oncogenicity studies (1,400) and as controls in a 1-yr toxicity study (20). Four of 13 neoplasms were found in the splee...
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Veröffentlicht in: | Toxicologic pathology 1995-07, Vol.23 (4), p.518-526 |
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Zusammenfassung: | Primary benign and malignant vascular neoplasms occurred spontaneously in 8 of 710 male (1.1%) and 4 of 710 female (0.6%) CrI:CD®Br strain Sprague-Dawley rats employed in two 2-yr oncogenicity studies (1,400) and as controls in a 1-yr toxicity study (20). Four of 13 neoplasms were found in the spleen; skin and kidney each had 2 neoplasms. Single vascular neoplasms were in the liver, testicle, uterus, mesenteric lymph node, and vagina. Hemangioma was more common (5 males, 2 females) than hemangiosarcoma (3 males, 2 females). Vascular neoplasms were considered the cause of death in 2 females, both with hemangiosarcomas involving the spleen or kidney. One male had 2 primary hemangiomas in separate organs. Vascular neoplasms are infrequently reported [1/82 females (1.2%), 1961; 9/880 both sexes (1.0%), 1985] in this rat strain. The incidence of vascular neoplasms of this report was higher in males (9) than in females (4), in contrast to incidences reported in the literature. |
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ISSN: | 0192-6233 1533-1601 |
DOI: | 10.1177/019262339502300409 |