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Science 1 April 1983:
Vol. 220. no. 4592, pp. 89 - 91
DOI: 10.1126/science.6828884
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Articles

Science, Vol 220, Issue 4592, 89-91
Copyright © 1983 by American Association for the Advancement of Science

articles

Tumor promotion by phorbol esters in skin: evidence for a memory effect

G Furstenberger, B Sorg, and F Marks

By means of a two-stage promotion protocol in mouse epidermis with 12-O-tetradecanoylphorbol-13-acetate as first-stage promoter and 12-O-retinoylphorbol-13-acetate as second-stage promoter, the effects of the former that are critical and obligatory for tumor promotion were shown to be irreversible in nature for at least 8 weeks. The reversibility of tumor promotion was related to the second stage of promotion, reflecting the reversibility of epidermal hyperplasia induced by 12-O-tetradecanoylphorbol-13-acetate.


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