Related Experiment Video
Updated: Aug 16, 2026
08:53
Identifying the Effects of BRCA1 Mutations on Homologous Recombination using Cells that Express Endogenous Wild-type BRCA1
Published on: February 17, 2011
Is BRCA1/BRCA2-related breast carcinogenesis estrogen dependent?
Mehadad Noruzinia1, Isabelle Coupier, Pascal Pujol
1Service de Genetique Medicale, CHU de Arnaud de Villeneuve, Montpellier, France.
Cancer
|September 13, 2005
Summary
Estrogen
Area of Science:
- Oncology
- Genetics
- Endocrinology
Background:
- Estrogen promotes sporadic breast cancer.
- Estrogen's role in hereditary breast cancer (BRCA1/BRCA2) is unclear.
- Prophylactic oophorectomy may reduce breast cancer risk in BRCA1/BRCA2 carriers.
Purpose of the Study:
- To clarify the effects of estrogens on risk modification in hereditary breast carcinoma.
- To explore the interaction between estrogens and BRCA proteins.
- To evaluate potential benefits of estrogen suppression therapies.
Main Methods:
- Literature review of studies on estrogen, BRCA1/BRCA2 mutations, and breast carcinoma risk.
- Analysis of clinical studies on oophorectomy and tamoxifen therapy.
- Examination of experimental models showing estrogen-BRCA1 interactions.
Main Results:
- Prophylactic oophorectomy and adjuvant tamoxifen may decrease breast cancer risk in BRCA1/BRCA2 carriers.
- Exogenous estrogens (oral contraceptives) might increase risk in familial breast cancer.
- Most BRCA1-related breast cancers are estrogen receptor-negative (ER).
- Evidence suggests interactions between estrogens and BRCA proteins, with BRCA1 potentially modifying estrogen receptor alpha (ERalpha) effects.
Conclusions:
- The precise role of estrogens in BRCA1/BRCA2-related breast cancer requires further investigation.
- Prospective studies are needed to determine the efficacy of estrogen suppression therapies for prevention and treatment.
- Understanding estrogen-BRCA interactions is crucial for personalized risk management.
More Related Videos
13:04In Vivo and Ex Vivo Approaches to Study Ovarian Cancer Metastatic Colonization of Milky Spot Structures in Peritoneal Adipose
Published on: October 14, 2015
08:15gDNA Enrichment by a Transposase-based Technology for NGS Analysis of the Whole Sequence of BRCA1, BRCA2, and 9 Genes Involved in DNA Damage Repair
Published on: October 6, 2014
Related Concept Videos
01:25Mutagenicity and Carcinogenicity
Mutagenicity and carcinogenicity refer to the ability of drugs to cause genetic defects and induce cancer, respectively. The International Agency for Research on Cancer (IARC) classifies agents into four groups based on their carcinogenic potential. Group 1 agents are known human carcinogens; group 2A agents are probably carcinogenic to humans; group 3 agents lack data to support their role in carcinogenesis; and group 4 includes agents for which data support that they are not likely to be...
02:38Mitogens and the Cell Cycle
Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
01:20The Retinoblastoma Gene
Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
02:59Cancer Prevention
Several factors can increase the risk of cancer in an individual. About 50% of cancer cases can be prevented by adopting a healthy lifestyle, regular exercise, eating healthy, and following a modest cancer prevention diet. Epidemiological studies have consistently shown that populations with vegetable and fruit-rich diets have reduced the incidence of cancer. On the other hand, populations who have a diet rich in animal fat, red meat, junk food, or high calories are predisposed to cancer.
Some...
Some...
01:33Cancer-Critical Genes I: Proto-oncogenes
Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
01:05Cancer-Critical Genes II: Tumor Suppressor Genes
Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...