He further modified his rapid assay method to enable urinary oestrogen to be measured during pregnancy which was used to great effect by obstetricians as a test of placental function and fetal well-being during pregnancy.
During a sabbatical year in 1970, Brown gained a D.Sc. from the University of Edinburgh and delivered 63 lectures and demonstrations in Europe and the USA.
Notwithstanding the advent of radioimmunoassay, the laboratory continued to be world renowned for its urinary assays and attracted large contracts, principally from Harvard University for studying risk factors in breast cancer and from Family Health International for studying the return of fertility during breast feeding. The work with Harvard won the Prix Antoine Lacassagne from Paris as the most important contribution to the study of breast cancer for that year.
In 1971 he was given a Personal Chair in the Department of Obstetrics and Gynaecol
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