DNA ploidy and percent S-phase as prognostic factors in node-positive breast cancer: Results from patients enrolled in two prospective randomized trials

T. E. Witzig, J. N. Ingle, D. J. Schaid, L. E. Wold, J. F. Barlow, N. J. Gonchoroff, J. B. Gerstner, J. E. Krook, C. S. Grant, J. A. Katzmann