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Endocrine mechanism of action of toremifene at the level of the central nervous system in advanced breast cancer patients.

Abstract：

PURPOSE:To differentiate the antagonistic and agonistic effect of toremifene at the level of the hypothalamus-hypophysis axis a leutinizing hormone-releasing hormone (LHRH) test was performed during a phase II clinical trial. METHODS:In 15 postmenopausal patients with advanced breast cancer, follicle-stimulating hormone (FSH) and LH release--induced by an LHRH agonist (Suprefact injection, 0.5 mg s.c.)--was monitored during a 16-week period of toremifene treatment (60 mg/day p.o.). Prolactin, estradiol, and sex hormone-binding globulin (SHBG) levels were also measured. The functional test was carried out prior to toremifene therapy and then 4, 8, 12, and 16 weeks afterward. RESULTS:The drug sensitized the pituitary to the action of the gonadotrophins; the LHRH-induced FSH and LH release showed a considerably increasing tendency during the toremifene therapy. Estradiol levels decreased statistically significantly and SHBG levels showed a statistically significant increase. A decreased level of prolactin is the sign of an antiestrogenic effect of toremifene on the hypophysis and, as a result, provides evidence for a direct influence of toremifene upon the pituitary. An increase in LH and prolactin release in response to the LHRH test was characteristic in the responders. CONCLUSION:According to the LHRH test, the antagonistic effect of toremifene seems to be more dominant than the concomitantly existing agonistic property. Neither clinical nor endocrinological side effects could be observed at the level of the CNS during a prolonged period of toremifene administration.

journal_name

Cancer Chemother Pharmacol

journal_title

Cancer chemotherapy and pharmacology

authors

Számel I,Hindy I,Budai B,Kangas L,Hajba A,Lammintausta R

doi

10.1007/s002800050811

subject

Has Abstract

pub_date

1998-01-01 00:00:00

pages

241-6

issue

3

eissn

0344-5704

issn

1432-0843

journal_volume

42

pub_type

杂志文章

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