From: The oestrogen paradox: an hypothesis
Study
Number
%
1962 Ryan
200
0%
1973 Kramer
70
4.3%
1975 Wellings
67
1.9%
1984 Neilsen
77
14.3%
1985 Alpers
101
8.9%
1985 Bhathal
207
12.1%
1987 Bartow
221
1988 Neilsen
109
14.7%
Total cases
1,052
5% DCIS and 1% IBC