This review outlines the changes in serum lipoprotein (Lp) concentrati
ons at the menopause. The effect of hormone replacement therapy with e
strogen and a variety of progestogens is illustrated by a number of re
cent studies. Analysis of the effects of estrogen replacement in the p
rimary prevention of coronary heart disease (CHD) is discussed. During
the last 4 years, there have been 4 observational studies of the use
of estrogen in postmenopausal women with CHD as assessed by coronary a
ngiography. In all of these studies, estrogen has been associated with
a reduction in CHD, most strikingly in a study of survival over 10 ye
ars. However, there is an overwhelming need for a randomised controlle
d trial of estrogen for secondary prevention. The role of estrogen in
the treatment of type II hyperlipoproteinaemia has been recognised, an
d a study describing its effect is discussed. Again, there is need for
data from well controlled clinical trials to clearly establish the be
nefits of estrogen therapy. A further aspect for investigation is a st
udy of the non-lipoprotein-mediated effects of estrogen, particularly
those on vasomotion. Finally, the intriguing effects of both androgeni
c and estrogenic steroids on Lp(a) are discussed.