title: The effect of adjuvant therapy with or without tamoxifen on the endocrine function of patients with breast cancer.
abstract: The ovarian and pituitary functions of 64 operable breast cancer patients undergoing adjuvant therapy with cytotoxic chemotherapy and/or tamoxifen were investigated. The post menopausal patients, divided into 3 treatment groups, one with tamoxifen alone, one with tamoxifen and chemotherapy and the other with chemotherapy alone had serum estradiol 17-beta (E2) and progesterone levels lower than the evaluable limits. Although there was no significant difference in the level of estrone sulfate (E1-S) between these three groups, the level of lutainizing hormone (LH) and follicle stimulating hormone (FSH) in the patients treated with tamoxifen alone and tamoxifen and chemotherapy were significantly lower than those treated with chemotherapy alone. The decrease in gonadotropin levels induced by tamoxifen treatment was reversible as it appeared after the initiation of tamoxifen and recovered after its cessation. In the premenopausal patients, a group treated with tamoxifen and chemotherapy had significantly higher E1-S, E2 and progesterone levels and significantly lower gonadotropin levels than a group treated with chemotherapy alone or one treated with a cyclophosphamide regimen. These increases in the levels of estrogen and progesterone were also reversible, and induced by tamoxifen. Thus, adjuvant endocrinochemotherapy causes profound alteration in the hypothalamo-pituitary-ovarian axis and therefore, monitoring a variety of hormonal levels is thought to be necessary for assessing the consequences of adjuvant therapy in breast cancer patients, especially in premenopausal patients using tamoxifen.
authors.affiliation: Second Department of Surgery, Kyoto Prefectural University of Medicine, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yasumura
authors.forename: T
authors.initials: T
authors.lastname: Akami
authors.forename: M
authors.initials: M
authors.lastname: Mitsuo
authors.forename: T
authors.initials: T
authors.lastname: Oka
authors.forename: K
authors.initials: K
authors.lastname: Naitoh
authors.forename: T
authors.initials: T
authors.lastname: Yamamoto
authors.forename: H
authors.initials: H
authors.lastname: Honjyo
authors.forename: H
authors.initials: H
authors.lastname: Okada
mesh_terms: D000368:Aged; D000903:Antibiotics, Antineoplastic / Q000008:administration & dosage / Q000627:therapeutic use*; D001943:Breast Neoplasms / Q000097:blood / Q000188:drug therapy* / Q000473:pathology; D003520:Cyclophosphamide / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use; D004341:Drug Evaluation; D004359:Drug Therapy, Combination; D004958:Estradiol / Q000097:blood*; D004970:Estrone / Q000031:analogs & derivatives / Q000097:blood; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood; D006062:Gonadotropins / Q000097:blood; D006801:Humans; D007986:Luteinizing Hormone / Q000097:blood; D008875:Middle Aged; D011374:Progesterone / Q000097:blood*; D013629:Tamoxifen / Q000008:administration & dosage / Q000627:therapeutic use*
chemical_list: D000903:Antibiotics, Antineoplastic; D006062:Gonadotropins; D013629:Tamoxifen; D004970:Estrone; D011374:Progesterone; D004958:Estradiol; D003520:Cyclophosphamide; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; C017296:estrone sulfate