Abstract
Data are presented on the effects of retinoic acid (RA) treatment on the in vivo growth of tumors in two mouse strains. Inhibition of tumor growth as a result of systemic RA injection was observed in three out of seven tumor models. Using adult thymectomized, lethally irradiated and fetal liver (A x TFL) reconstituted mice, we found that inhibition of tumor growth is not due to direct toxic effects of RA but rather appears to be the result of stimulation of thymus-dependent immune-mediated effectors to suppress tumor growth. Results suggest that only strongly immunogenic tumors are sensitive to in vivo retinoid inhibition.
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