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INDUCTION OF TUMORS INVOLVING BONE IN BEAGLES FED TOXIC LEVELS OF STRONTIUM 90

R. R. POOL D.V.M., PH.D., R. J. ROMER WILLIAMS M.D., and M. GOLDMAN PH.D.

Bone tumors were induced in 22 Beagles following ingestion of Sr90 during the first 1.5 years of life.

The tumors involving the bone were related to daily dosage, both with respect to age at first recognition and location of lesion. These tumors developed in 11 of 19 dogs receiving sim20,000 mrad/day to bone; 9 of 47 receiving sim7,000 mrad/day; and 2 of 56 receiving sim2,000 mrad/day. No tumors have developed in 160 control or 251 comparable Sr90 dogs fed at lower levels.

The temporal, spatial, and morphologic tumor pattern, when related to dose rate, suggests that the risk for tumor production may be a function of rate and degree of cellular repair which, in turn, is dependent on the severity of prior radiation injury.


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