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Prospective case-control study of premenopausal serum estradiol and testosterone levels and breast cancer risk.

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BACKGROUND Breast cancer is frequently a hormonally dependent cancer, and associations of circulating estrogens and androgens with subsequent breast cancer risk are well established in postmenopausal women. Associations of serum estrogens and androgens with breast cancer risk in premenopausal women

Breast cancer, aromatase inhibitor therapy, and sexual functioning: a pilot study of the effects of vaginal testosterone therapy.

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BACKGROUND Women with breast cancer have better cancer-related outcomes with the use of aromatase inhibitors (AIs), but the physiological suppression of estradiol can negatively affect sexual functioning because of unpleasant urogenital and vaginal symptoms. Local health care practitioners have

The effect of 7beta, 17alpha-dimethyltestosterone (calusteron) on testosterone metabolism in women with advanced breast cancer.

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Calusterone (7beta, 17alpha-dimethyltestosterone) is a 17-alkylated, orally active androgenic steroid used in the treatment of breast cancer. The effect of this steroid on the metabolism of 14C-testosterone and the excretion of endogenous urinary androgen metabolites has been studied in four

Estradiol formation from testosterone by continuously cultured human breast cancer cells.

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Two human breast cancer cell lines (MCF-7 and MDA-MB-231) and one cell line derived from normal human breast (HBL-100) were examined for the presence of aromatase activity by determining the amounts of [3H]estradiol ([3H]E2) formed by cell cultures incubated with [3H]testosterone. Aromatase activity

Distribution of estradiol and percentage of free testosterone in sera of Japanese women: preoperative breast cancer patients and normal controls.

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For the purpose of investigating a possible correlation between the genesis of breast cancer and the serum contents of free (non-protein-bound) estradiol (E2) and free testosterone (T) in Japanese women, the distributions of free and total E2 and T and the binding capacity of sex hormone-binding

Postmenopausal testosterone therapy and breast cancer risk.

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BACKGROUND Testosterone therapy is being increasingly used in the management of postmenopausal women. However, as clinical trials have demonstrated a significantly increased risk of breast cancer with oral combined estrogen-progestin therapy, there is a need to ascertain the risk of including

Plasma testosterone and prognosis of postmenopausal breast cancer patients.

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OBJECTIVE High endogenous testosterone is associated with increased breast cancer (BC) risk. We designed this study specifically to assess the long-term prognostic role of testosterone in a cohort of postmenopausal BC patients. METHODS We considered 194 postmenopausal women, operated on for early BC

Serum testosterone levels and breast cancer recurrence.

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Prospective studies show that high serum levels of androgens and estrogens are associated with increased incidence of postmenopausal breast cancer. The aim of the present analysis was to study the prognostic value of serum testosterone, estradiol and related factors in postmenopausal breast cancer

Effects of tamoxifen on testosterone metabolism in postmenopausal women with breast cancer.

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Testosterone is a known estrogen precursor especially in postmenopausal women. Tamoxifen, an anti-estrogen, is used in the treatment of women with breast cancer in whom metastatic disease has been demonstrated. The action of Tamoxifen is thought to be to occupy the intracellular estrogen receptor

Testosterone levels as a marker of prognosis to goserelin treatment in metastatic breast cancer.

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Testosterone levels were measured in blood and urine of 35 premenopausal metastatic breast cancer patients before starting therapy with the gonadotrophin-releasing hormone (GnRH) analogue, goserelin. The aim of the study was to verify the reliability of testosterone measurement as a marker of

Urinary testosterone as a marker of risk of recurrence in operable breast cancer.

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We investigated the role of urinary testosterone levels as a marker of risk of recurrent disease in 113 operable breast cancer patients (70 premenopausal, 43 postmenopausal). Twenty-four-hour urine collections for testosterone measurement were obtained before surgical treatment, between 20-40 days

The incidence of invasive breast cancer among women prescribed testosterone for low libido.

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BACKGROUND Although the efficacy of testosterone for the treatment of hypoactive sexual desire disorder is well established, the effect of testosterone therapy on breast cancer risk remains uncertain. OBJECTIVE The incidence of invasive breast cancer among past and current testosterone

Androgen receptors and serum testosterone levels identify different subsets of postmenopausal breast cancers.

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BACKGROUND Androgen receptors (AR) are frequently expressed in breast cancers, but their implication in cancer growth is still controversial. In the present study, we further investigated the role of the androgen/AR pathway in breast cancer development. METHODS AR expression was evaluated by

Reduced testosterone, 17 beta-oestradiol and sexual hormone binding globulin, and increased insulin-like growth factor-1 concentrations, in healthy nulligravid women aged 19-25 years who were first and/or second degree relatives to breast cancer patients.

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Differences in hormonal and constitutional parameters between women with at least one first and/or second degree relative with breast cancer (RBC) and women without such affected relatives were studied in a group of healthy, nulligravid women aged 19-25 years. Present oral contraceptive (OC) users

The Activity of SN33638, an Inhibitor of AKR1C3, on Testosterone and 17β-Estradiol Production and Function in Castration-Resistant Prostate Cancer and ER-Positive Breast Cancer.

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AKR1C3 is a novel therapeutic target in castration-resistant prostate cancer (CRPC) and estrogen receptor (ER)-positive breast cancer because of its ability to produce testosterone and 17β-estradiol intratumorally, thus promoting nuclear receptor signaling and tumor progression. A panel of CRPC,

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