TITLE

Decreasing hormonal promotion is key to breast cancer prevention

AUTHOR(S)
Lakshmanaswamy Rajkumar; Amy Canada; David Esparza; Katherine Collins; Enrique Moreno; Huyen Duong
PUB. DATE
April 2009
SOURCE
Endocrine (1355008X);Apr2009, Vol. 35 Issue 2, p220
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Abstract  An early full-term pregnancy in women is highly protective against breast cancer. This protection can be mimicked by short-term treatment with estradiol plus progesterone in nulliparous rats. We determined the effect of long-term hormonal promotion following the protective short-term estradiol and progesterone treatment that mimics parity protection against mammary tumors. Rats were treated with N-methyl-N-nitrosourea before or after protective hormone treatment. In brief, the animals could be broadly classified into three categories. First, the controls that received no protective hormone treatment, second, the short-term protective hormone treated rats, and third, rats which received the short-term protective hormone treatment plus continuous treatment with estradiol or progesterone or a combination of estradiol and progesterone. Different doses of hormones were used for short-term protective and long-term promotion treatments. The experiments were terminated 9 months post carcinogen treatment. Mammary tumor incidence in all the short-term estradiol- plus progesterone-treated rats was significantly lower compared with controls. Short-term hormone treatment followed by long-term promotion resulted in an increased mammary tumor incidence compared with animals that received only the short-term treatment. Overall, the results demonstrate the importance of the promotional environment in mammary carcinogenesis indicating that the decreased promotional environment could be the reason for protection against mammary carcinogenesis.
ACCESSION #
37142374

 

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