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Vorozole results in greater oestrogen suppression than formestane in postmenopausal women and when added to goserelin in premenopausal women with advanced breast cancer.

Abstract：

:The high potency and selectivity of new aromatase inhibitors has translated to greater efficacy and improved tolerability in comparison with established second-line hormonal agents for advanced breast cancer in phase III clinical trials. Two pharmacological studies are reported which assess the use of one of these inhibitors, vorozole, in combination or comparison with well-established methods of oestrogen deprivation in pre and postmenopausal patients. When combined with the gonadotrophin-releasing hormone agonist (GnRHa) goserelin in 10 premenopausal patients, vorozole markedly enhanced the suppression of serum levels of oestrone, oestradiol and, oestrone sulphate beyond that achieved by goserelin alone (by a mean 74%, 83%, and 89%, respectively). The combination was well-tolerated and had no significant effects on androgen levels. Vorozole was compared with formestane in 13 postmenopausal women and serum oestrone, oestradiol, and oestrone sulphate levels were suppressed by 47%, 30%, and 70%, respectively, more by vorozole than by the steroidal aromatase inhibitor. Again the tolerability was excellent. The plasma oestrogen levels in the postmenopausal patients on vorozole were lower than in the premenopausal patients on goserelin plus vorozole, indicating that ovarian oestrogen synthesis may be relatively resistant to aromatase inhibition, even during GnRHa treatment. Thus, in both pre and postmenopausal patients substantially greater suppression of oestrogen can be achieved by vorozole compared with alternative approaches. Existing clinical-pharmacological correlates suggest that these increases in pharmacological effectiveness may result in enhanced clinical effectiveness.

journal_name

Breast Cancer Res Treat

journal_title

Breast cancer research and treatment

authors

Dowsett M,Doody D,Miall S,Howes A,English J,Coombes RC

doi

10.1023/a:1006289811540

subject

Has Abstract

pub_date

1999-07-01 00:00:00

pages

25-34

issue

eissn

0167-6806

issn

1573-7217

journal_volume

pub_type

临床试验,杂志文章

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Vorozole results in greater oestrogen suppression than formestane in postmenopausal women and when added to goserelin in premenopausal women with advanced breast cancer.