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© 1995 Oxford University Press

research-article

Malignant progression of papillomas induced by the initiation-promotion protocol in NMRI mouse skin

G. Fürstenberger and A. Kopp-Schneider 1

Research Programs Tumor Cell Regulation Postfach 101949, D-69009 Heidelberg, Germany
1Biostatistics, German Cancer Research Center Postfach 101949, D-69009 Heidelberg, Germany

Recording of individual responses to initiation-promotion was used to study the relationship between papilloma and carcinoma formation in NMIRI mouse skin. This type of analysis is without precedent in that It allows a statistical evaluation of the data which was impossible with previously published analyses based upon cumulative tumor response data evaluated in other mouse strains. Initiation with DMBA and promotion with TPA yielded papillomas con sisting of two sub-populations, reversible and persistent papillomas. The ratio of persisting to reversible papillomas was Independent of the duration of promotion, indicating comparable growth rates for both types of papillomas. Fifty percent of the persistent and 4% of all papillomas progressed into carcinomas. Promotion for {succeeds}20 weeks increased neither the total number of papillomas nor the number of carcinomas. Both the maximum number of persistent and the maximum number of reversible papil lomas correlated with the risk of malignant progression, excluding persistent papillomas as being the exclusive precursor lesions for malignant progression.


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