Blogger's Note: the abstract makes no reference to clear cell ovarian, given the number of women followed this omission (in the abstract) is curious
Hormone Therapy and Different Ovarian Cancers: A National Cohort Study
Abstract
Postmenopausal hormone therapy use
increases the risk of ovarian cancer. In the present study, the authors
examined the risks
of different histologic types of ovarian cancer
associated with hormone therapy.
Using Danish national registers, the
authors
identified 909,946 women who were followed from
1995–2005. The women were 50–79 years of age and had no prior
hormone-sensitive
cancers or bilateral oophorectomy.
Hormone therapy
prescription data were obtained from the National Register of Medicinal
Product Statistics. The National Cancer and
Pathology Register provided data on ovarian cancers, including
information about
tumor histology......... In an average of 8.0 years of follow
up, 2,681 cases of epithelial ovarian cancer were detected.
Compared
with
never users, women taking unopposed oral estrogen
therapy had increased risks of both serous tumors and
endometrioid tumors but
decreased risk of mucinous tumors. Similar increased risks of serous and
endometrioid
tumors were found with estrogen/progestin therapy,
whereas no association was found with mucinous tumors.
Consistent with
results from recent cohort studies, the authors
found that ovarian cancer risk varied according to tumor histology. The
types
of ovarian tumors should be given attention in
future studies.