cancers take an average of eight years to reach about half an
inch in size. This means that breast cancers started in the first
year of the study would not be detected for eight or more years.
The study followed women for only about five years so all or
most of the breast cancers found were probably present in an
undetected state before the study began.
Janet asked if HRT use might have caused some breast cancers
to grow more rapidly and ...
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