Estrogen Therapy: WHI Initiative in Perspective (cont.)
The First surprise was that the WHI study was stopped early, after just 5.2 years, because
there were early signs of increased harm (increase in coronary heart disease,
stroke, and blood clots in the lungs) that
outweighed the benefits (decreased fractures and colon cancer).
The WHI estimates that out of 10,000 women who take the particular EPT
combination over the course of a year, we can expect additional cases of several
serious health problems:
- 23 additional diagnoses of dementia
- 7 more
- 8 more strokes
- 8 more pulmonary emboli
- 8 more breast cancer cases
At the same time, however, there would be 6 fewer colorectal cancers and 5 fewer hip
fractures. Many are women who are "hanging on" to EPT because of fear of
Alzheimer's disease running in her family, only to be disappointed by the WHI
The increase in breast cancer became especially apparent after 3-5 years, but
the increase in heart disease and pulmonary emboli occurred early on, in the
Some physicians, and their patients, would say that we finally have the
answer, but we don't necessary like it. On the other hand, many points are
- There is still nothing that works better than estrogen therapy for hot
flashes, moreover, no other therapy besides estrogen is approved for hot flashes.
- Women in the WHI study were not picked because they had hot flashes,
so we really don't know the long-term risks and benefits for younger women who
are beginning EPT when they are actively battling hot flashes.
- The increase in risk to an individual woman is still small.
- Many women in the WHI study were older yet most women begin EPT when
- It seems that the progesterone part of the EPT may be the "bad guy"
regarding breast cancer risk. (Progesterone is given to protect against uterine
cancer during estrogen therapy). The part of the WHI study that is following women
after hysterectomy who are taking estrogen alone is still ongoing. Maybe
estrogen alone will be found to be a little safer in certain aspects, possibly
reassuring to women with a hysterectomy.
- Only one type of EPT was used in the WHI study. We don't know how other brands
and doses compare. For now, we have to assume the same risks apply to other
preparations, until proven otherwise.