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Should You Get Tested for the Breast Cancer Genes?

Do you have a family or personal history of breast cancer?  If so, it's important to learn if and when you should get gene testing.

By
Sanaz Majd, MD,
October 5, 2016
Episode #199

Page 1 of 2

October is Breast Cancer Awareness Month, and I couldn't possibly pass up an opportunity to address this important topic.

Superstar Angelina Jolie’s shocking decision to obtain a preventative bilateral mastectomy drew great attention and headlines towards the gene cancer testing that more women are contemplating to prevent breast cancer—the most common cancer in women in the United States. 

When my own sister was diagnosed with breast cancer several years ago, I watched her experience each phase of this taxing illness with a very different patient perspective. And yet, people are still confused surrounding breast cancer gene testing.  My sister’s general surgeon attempted to seek insurance approval for her to get gene testing, given her rather young diagnosis in her 40s, but was denied.  My sister was baffled: why would the insurance companies deny such an importance piece of information that can possibly help her other three sisters given her young age of diagnosis with breast cancer?

It’s not always so simple.  Let me explain what the process of breast cancer gene testing really entails. 

What Is Genetic Testing?

The mostly common involved and most familiar breast cancer genes are the BRCA-1 and BRCA-2 genes. This sort of gene testing can be performed on blood, saliva, or even cheek swabbing.  The challenge? Hundreds of genes involving these two mutations have been discovered. Therefore, obtaining a complete test for all involved possibilities can cost up to 4,000 dollars. If patients meet certain criteria, however, insurance may cover up to 90% of the testing cost. What may be less costly and more simple, however, is if you already have an identified gene in another relative, in which testing can be more targeted and therefore much less costly. 

Besides this BRCA gene testing, further testing involving large genomic rearrangements (or what is referred to as “LR”) may be considered—especially in people of Latin American, Caribbean, and Middle Eastern descent who are at higher risk of testing positive.

Who Is at Increased Risk of Testing Positive for Breast Cancer Genes?

Before we dive deeper into this topic, it’s important to note that not everyone should have gene testing. First, let's learn what populations may truly be at higher risk of developing breast cancer, and may possibly consider gene testing:

  • Those with a first degree relative with breast cancer, most especially with multiple first-degree relatives with breast cancer
  • Those with family history of male breast cancer
  • Those with family history of both breast and ovarian cancer
  • Those with a known family member with a positive breast cancer gene
  • Younger age at the onset of diagnosis, below age 50
  • Recurrent breast cancer in the same patient
  • Bilateral breast cancer
  • Ashkenazi Jewish ethnicity

​Patients who desire genetic testing should strongly consider both pre- and post-genetic counseling because it may be one of the most complex medical decision-making processes of their life.  Getting tested and basing any decisions on this testing would truly require expertise in this not-so-easy-to-understand field.

Most hereditary breast and ovarian cancer genes (which often run in families together) involve one of two specific genes, the BRCA-1 and BRCA-2.  But most patients who undergo testing do not have a mutation in either gene. That’s right—most breast cancer is not hereditary. Hereditary breast cancer is uncommon compared to sporadic diagnoses.

But if given your personal history and your family history, your physician deems you at higher risk, being referred to a board-certified genetic counselor should be the very first step in the testing process. 

A genetic counselor will likely obtain a detailed family and pedigree history, often at least one or two generations back, including both maternal and paternal families.  Then, they will review mathematical models of risk assessments with potential gene involvement based on your family and personal history. 

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