Prevention of mammary carcinogenesis by short-term estrogen and progestin treatments.

Effects of different durations of estrogen and progesterone treatment on development of N-methyl-N-nitrosourea-induced mammary carcinomas in female Lewis rats.

Short-term exposure to pregnancy levels of estrogen prevents mammary carcinogenesis.

Estradiol and progesterone can prevent rat mammary cancer when administered concomitantly with carcinogen but do not modify surviving tumor histology, estrogen receptor alpha status or Ha-ras mutation frequency.

N-methyl-N-nitrosourea-induced mammary carcinogenesis is promoted by short-term treatment with estrogen and progesterone mimicking pregnancy in aged female Lewis rats.

Prevention of breast cancer by recapitulation of pregnancy hormone levels.

Estrogen and progesterone treatment mimicking pregnancy for protection from breast cancer.

Hormone levels and mammary epithelial cell proliferation in rats treated with a regimen of estradiol and progesterone that mimics the preventive effect of pregnancy against mammary cancer.

Insulin-like growth factor (IGF)-I obliterates the pregnancy-associated protection against mammary carcinogenesis in rats: evidence that IGF-I enhances cancer progression through estrogen receptor-alpha activation via the mitogen-activated protein kinase pathway.

Hormonal prevention of breast cancer: significance of promotional environment.

Inhibition of mammary gland tumors by short-term treatment of estradiol-3-benzoate associated with down-regulation of estrogen receptor ERalpha and ERbeta.

Hormonal prevention of breast cancer: mimicking the protective effect of pregnancy.

Chemoprevention of N-nitroso-N-methylurea-induced mammary cancers by pretreatment with 17 beta-estradiol and progesterone.

Short-term exposure to estrogen and progesterone induces partial protection against N-nitroso-N-methylurea-induced mammary tumorigenesis in Wistar--Furth rats.

Hormone-induced protection of mammary tumorigenesis in genetically engineered mouse models.

Parous rats regain high susceptibility to chemically induced mammary cancer after treatment with various mammotropic hormones.

Protective effects of pregnancy and lactation against N-methyl-N-nitrosourea-induced mammary carcinomas in female Lewis rats.

Long term inhibition by estradiol or progesterone of melatonin secretion after administration of a mammary carcinogen, the dimethyl benz(a)anthracene, in Sprague-Dawley female rat; inhibitory effect of Melatonin on mammary carcinogenesis.

Short-term hormone treatment as a chemopreventive method against mammary cancer initiation in rats.

Mechanisms of hormonal prevention of breast cancer.