Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Cyclopentanohydrophenanthrene ring system doai
Reexamination Certificate
2000-07-12
2002-09-17
Cook, Rebecca (Department: 1614)
Drug, bio-affecting and body treating compositions
Designated organic active ingredient containing
Cyclopentanohydrophenanthrene ring system doai
C514S899000
Reexamination Certificate
active
06451780
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to the use of at least one compound with a progesterone-antagonistic (PA) action for the production of pharmaceutical agents for the treatment of dysfunctional uterine bleeding.
Forms of dysfunctional uterine bleeding (dysfunctional or abnormal uterine bleeding, metrorrhagias and menorrhagias, hypermenorrhea) are forms of pathological bleeding that are not attributable to organic changes in the uterus (such as, e.g., endometrial carcinoma, myomas, polyps, etc.), systemic coagulation disorders, or a pathological pregnancy (e.g., ectopic pregnancy, impending abortion) (American College of Obstetricians and Gynecologists, 1982).
The average blood loss during normal menstruation is about 30 ml, whereby the period lasts for an average of 5 days. If the blood loss exceeds 80 ml, it is classified as pathological (Zahradnik HP, (1992) Menstruation. In Käser O et al. (editors) Gynäkologie und Geburtshilfe [Gynecology and Obstetrics], Vol. ½, Georg Thieme Verlag Stuttgart, New York: 7.31-7.51).
Metrorrhagias are defined as bleeding that may or may not be accompanied by pain and that cannot be linked to menstruation or cycle. If it lasts over 7 days, the blood loss often exceeds 80 ml.
Menorrhagia is menstruation that may or may not be accompanied by pain, normally every 27-28 days, which, when it lasts over 7 days, is associated in most cases with an increased blood loss of over 80 ml.
Hypermenorrhea is defined as menstruation that may or may not be accompanied by pain, normally every 27-28 days for 4-5 days with an elevated blood loss of over 80 ml.
Forms of dysfunctional uterine bleeding (mainly metrorrhagias and menorrhagias) are typical of adolescence and of the time of menopause, in which follicle-stimulating disorders, anovulation, and yellow-body and follicle persistence occur in clusters. The incidence of dysfunctional uterine bleeding is high and represents one of the most frequent reasons for gynecological consultation for women of reproductive age. The consultation rate because of dysfunctional uterine bleeding is 33% in reproductive age and 69% in perimenopause and postmenopause (Mencaglia, L., Perino, A., Hamon, J. (1987) Hysteroscopy in Perimenopausal and Postmenopausal Women with Abnormal Uterine Bleeding. J. Reprod. Med. 32:577).
The multiplicity of the treatments used with dysfunctional uterine bleeding is an indirect indication that the pathogenesis of this disease is still not clarified and no effective treatment yet exists. At this time, forms of dysfunctional uterine bleeding are treated with gestagens (e.g., 10 mg of medroxyprogesterone acetate daily, 0.7-1.0 mg of norethindrone acetate daily, each for 10-14 days), large-dose estrogen/gestagen combinations over a period of 10-14 days, but also with nonsteroidal cyclooxygenase inhibitors (e.g., mefenamic acid, naproxen, ibuprofen) and LHRH agonists (Cowan BD (1992) Dysfunctional Uterine Bleeding: Clues to Efficacious Approaches. In Alexander N.J., d'Arangues C (editors), Steroid Hormones and Uterine Bleeding, AAAS Press, 1922: 9-17).
The treatment with a large-dose estrogen/gestagen combination is associated with known cardiovascular risks (predominantly thromboembolic diseases). If treating dysfunctional uterine bleeding with medication is not successful, surgical methods (uterine curettage, hysterectomy) are recommended. After uterine myoma, dysfunctional uterine bleeding represents the second most frequent indication for this operation (Lee N C, Dicker R C, Rubin G L, Ory H W (1984) Confirmation of the Preoperative Diagnosis for Hysterectomy. Am. J. Obstet. Gynecol., 150: 283). It is noteworthy that it has not been possible in recent years to reduce the number of hysterectomies performed because of dysfunctional uterine bleeding, especially in the case of premenopausal women even though a wide variety of medicinal possibilities of treatment is available (Lumsden Mass., (1990) Menorrhagia—The Cost and Scope of Treatment. In Shaw RW (editor) Dysfunctional Uterine Bleeding. The Parthenon Publishing Group: 85-96). Hysterectomy carries risks that should not be underrated. The mortality rate after a hysterectomy is 6 per 100,000 (Wingo et al., 1985).
SUMMARY OF THE INVENTION
The object of the invention is therefore to provide a pharmaceutical agent for the indication provided, which halts dysfunctional bleeding and does not exhibit or exhibits only to a slight extent the undesirable effects of large-dose estrogen/gestagen preparations.
Such a new medicinal approach is the use of competitive progesterone antagonists (antigestagens) for the production of a pharmaceutical agent for the indication provided.
Antigestagens, if they are administered in the luteal phase, are able to induce menstruation-like bleeding (Nieman L K, Healy D L, Spitz I M, Nisula B C, Merriam G R, Bardin C W, Loriaux D L, Chrousos G P (1985) Use of Single Doses of the Antiprogesterone Steroid R U 486 for Induction of Menstruation in Normal Women. In Baulieu E E; Segal S J (editors): The Antiprogestin Steroid RU 486 and Human Fertility Control, Plenum Press, New York and London: 279-285). Experiments on primates show that antigestagen-induced bleeding leads to complete elimination of the endometrial tissue (Chilik C F, Hsiu J G, Acosta A A, van Uem JFHM, Hodgen G D (1986) RU 486-Induced Menses in Cynomolgus Monkeys: Uniformity of Endometrial Sloughing. Fertil Steril [Fertile Sterile] 45:708). The exact mechanism by which bleeding is induced by the drop in progesterone in a normal cycle or by antigestagen treatment has yet to be clarified. It is assumed that the progesterone deprivation leads to an induction of uterine prostaglandins, which induce bleeding (Zahradnik HP, (1992), loc. cit.).
It is also known that progesterone inhibits the synthesis of endothelin in the uterus and stimulates its enzymatic degradation (Casey M L, MacDonald PC (1992), Modulation of Endometrial Blood Flow: Regulation of Endothelin-1 Biosynthesis and Degradation in Human Endometrium. In Alexander N.J., d'Arcangues C (editors), Steroid Hormones and Uterine Bleeding. AAAS Press, 1992: 210224). Endothelin is regarded as the most potent vasoconstrictive endogenic substance. It is assumed that the increased release of endothelin at the end of a normal cycle results in constriction of spiral arterioles in the endometrium because of the drop in progesterone and as a result induces menstrual bleeding (Casey and MacDonald (1992), loc. cit.).
It has now been found, surprisingly enough, that competitive progesterone antagonists are able to produce a cessation of bleeding owing to vasoconstriction of endometrial arteries by the increase of uterus contractions and the thus-produced action on the myometrium, in the case of dysfunctional uterine bleeding. In the case of dysfunctional uterine bleeding, namely the activation of mechanisms that result in vasoconstriction of endometrial arteries appears to be inadequate because of a drop in progesterone that is incomplete or lasts too long.
Undesirable side effects, such as those that can occur in treatment with large-dose estrogen/gestagen preparations, are not observed when using competitive progesterone antagonists. The latter can be regarded as substances without significant side effects.
To date, nothing is known about the treatment of dysfunctional uterine bleeding with antigestagens in the normal cycle. Rather, attention is directed to the use of gestagens for this indication (Cowan 1992, loc. cit.). The fact that it is possible to reduce the occurrence of instances of breakthrough bleeding that happen when treatment is carried out with a low-dose estrogen- and gestagen-containing oral contraceptive owing to inadequate cycle control because of the low dosage is described in international patent application WO-A-93/17686. The use of progesterone-antagonistically active compounds by themselves or in combination with antiestrogenically active compounds for the production of pharmaceutical agents for inducing labor, for termination of pregnancy, and fo
Chwalsz Kristof
Stöckemann Klaus
Cook Rebecca
Millen White Zelano & Branigan P.C.
Schering Aktiengesellschaft
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