Affiliations of authors: T. G. Karrison, D. J. Ferguson, Departments of Health Studies and Surgery, University of Chicago, IL; P. Meier, Columbia University, New York, NY.
Correspondence to: Theodore G. Karrison, Ph.D., Department of Health Studies, MC2007, University of Chicago, 5841 S. Maryland Ave., Chicago, IL 60637 (e-mail: tkarrison{at}health.bsd.uchicago.edu).
In their 1996 essay, Spratt et al. concluded that the growth of breast cancer can be characterized by "a decelerating curve with great natural variance." This description is probably not of great use clinically, although it was carefully established and it may enhance biologic understanding of this disease. In any case, while we agree that variations in tumor doubling times, rather than late induction of tumor growth, could explain some of the long latency periods observed in our study, we believe it is uncertain whether this variation would account for the majority of late recurrences.
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