The active ingredient in a drug used to treat symptoms of
advanced prostate cancer. It is also used to treat early puberty in children and
certain gynecologic conditions. It is being studied in the treatment of other
conditions and types of cancer. Leuprolide blocks the body from making
testosterone (a male hormone) and estradiol (a female hormone). It may stop the
growth of prostate cancer cells that need testosterone to grow. It is a type of
gonadotropin-releasing hormone analog. (http://www.cancer.gov/)
Leuprolide is FDA approved for the treatment of advanced prostate cancer. It is
important for patients to remember that physicians have the ability to prescribe
medication for conditions other than those for which the drug has been approved
by the FDA. Patients who have received a prescription of this drug for a
condition other than which it is approved may wish to discuss this issue with
their physician. Leuprolide is classified as a luteinizing hormone releasing
hormone (LHRH) agonist. LHRH is a naturally occurring hormone in the body that
is involved in stimulating the production of female and male hormones such as
estrogen and testosterone. Leuprolide inhibits the signaling of LHRH so that the
production of estrogen or testosterone is reduced. Certain cancers, such as
prostate cancer, are stimulated to grow from hormones. The reduction in the
production of growth-stimulatory hormones inhibits the growth of cancer
cells. (http://www.ufscc.ufl.edu/)
Leuprolide is a luteinizing hormone releasing hormone (LHRH) agonist. It
is a synthetic analog of LHRH (also known as gonadotropin releasing hormone
[GnRH]).3 LHRH agonists (LHRHa) initially stimulate the release of luteinizing
hormone (LH, gonadotropin), resulting in a transient elevation in serum androgen
in men and serum estradiol in women. However, chronic administration can cause
down-regulation of the LHRH receptors, thus inhibiting the secretion of LH and
ultimately the sex hormones (androgen, estradiol). By decreasing the testicular
production of androgen in men, LHRHa can inhibit the growth of androgen-dependent
prostate cancer. Similarly, LHRHa reduce the ovarian secretion of estradiol
and progesterone in women,4 leading to inhibition of estrogen-dependent cancers.
In men, LHRHa can reduce serum androgen to castrate level. Similarly, in pre-menopausal
women, serum estradiol level is reduced to post-menopausal levels. These decreases
occur within two to four weeks after initiation of treatment, and are maintained
as long as treatment continues. LHRHa are 50-100 times more potent than LHRH.5
In addition, they have a longer duration of action due to increased receptor
affinity and greater biological stability. (http://www.bccancer.bc.ca/)
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