S. Faiderbe et al., CHEMICALLY-INDUCED SARCOMAS IN SPRAGUE-DAWLEY RATS - DOSE EFFECTS ON AUTOANTIBODY LEVELS AND TUMOR PROGRESSION, Cancer detection and prevention, 19(3), 1995, pp. 274-277
We previously reported that a single injection of 2 mg benzo[a]pyrene
(B[a]P) induced seric anti-phosphatidylinositol (PtdIns) autoantibodie
s (autoAb) and highly malignant sarcomas with 100% efficiency in Sprag
ue-Dawley (SD) female rats. To evaluate the effects of lower doses, we
administered a single dose (from 0.125 to 1 mg) of B[a]P into such ra
ts. In all cases, we noted significantly high levels of anti-PtdIns au
toAb, with clinically palpable tumors appearing around Day 100. Tumors
grew more slowly than they did in the previous model (2 mg B[a]P). Bo
th anti-PtdIns autoAb levels and first appearance of the tumor seemed
to be independent of carcinogen doses. Conversely, tumor evolution see
med to depend on B[a]P doses.