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Related Experiment Video

Updated: Jul 3, 2026

An Ex vivo Model to Study Hormone Action in the Human Breast

An Ex vivo Model to Study Hormone Action in the Human Breast

Published on: January 8, 2015

Breast development, hormones and cancer.

Jose Russo¹, Irma H Russo

¹Breast Cancer Research Laboratory, Fox Chase Cancer Center, 333 Cottman Avenue, Philadelphia, PA 19111, USA. j_russo@fccc.edu

Advances in Experimental Medicine and Biology

|July 22, 2008

Summary

Breast cancer often starts in early adulthood when specific breast structures are most susceptible to cancer. Factors like pregnancy can influence breast cancer risk by affecting mammary gland differentiation.

Area of Science:

Reproductive endocrinology
Oncology
Cell biology

Background:

Breast cancer arises from undifferentiated terminal structures in the mammary gland.
The Lobule 1 (Lob 1) terminal ducts are primary sites for ductal carcinoma development.
Mammary gland susceptibility to carcinogenesis peaks during early adulthood due to high cell replication.

Purpose of the Study:

To investigate the heightened susceptibility of Lob 1 to neoplastic transformation.
To correlate in vitro findings with epidemiological observations on breast cancer incidence.

Main Methods:

In vitro studies assessing proliferative activity, estrogen receptor content, and DNA carcinogen binding in Lob 1.
Analysis of epidemiological data on breast cancer incidence in nulliparous women and effects of pregnancy.

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Main Results:

In vitro studies confirmed Lob 1 exhibits the highest proliferative activity, estrogen receptor content, and DNA carcinogen binding rate.
Higher breast cancer incidence in nulliparous women supports the susceptibility of Lob 1.
Early full-term pregnancy appears protective, potentially due to increased mammary gland differentiation.

Conclusions:

The Lob 1 terminal duct structures are particularly vulnerable to developing breast cancer during early adulthood.
Mammary gland differentiation, influenced by factors like pregnancy, plays a crucial role in modulating breast cancer risk.