sentences:  Chronic symptoms include induction of hepatomas in rats, pulmonary tumours in mice, renal lesions and alterations in the liver and kidneys of African Green monkeys.Rats fed 5-10 mg/kg of sterigmatocystin for two years showed a 90% incidence of liver tumours.It has been suggested that sterigmatocystin is about 1/10 as potent a carcinogen as aflatoxin B1.