1. Beatson, G. T. Lancet ii, 104–107 (1896).
2. McGuire, W. L., Horwitz, K. B., Pearson, O. H. & Segaloff, A. Cancer 39, 2934–2947 (1977).
3. Jensen, E. V., De Sombre, E. R. & Jungblut, P. W. Endogenous Factors Influencing Host-Tumour Balance (eds Wissler, R. W., Dao, T. L. & Wood, S. Jr) 15–30 (University of Chicago Press, 1967).
4. McGuire, W. L., Carbone, P. P., Sears, M. E. & Escher, G. C. Estrogen Receptors in Human Breast Cancer (eds McGuire, W. L., Carbone, P. P. & Vollmer, E. P.) 1–7 (Raven, New York, 1975).
5. Jensen, E. V. Cancer Res. 35, 3362–3364 (1975).