FREQUENTLY ASKED QUESTIONS
Who is a close blood relative when considering family history?
What about men who are BRCA positive?
Men who are BRCA mutation carriers have increased risk of breast cancer and prostate cancer. They are instructed on self breast exams and advised annual breast exams after the age of 35 year and annual prostate cancer screening after age 40 years. Men can pass on the mutation to their biological children- both their sons and daughters.
How does a BRCA mutation impact my breast cancer treatment?
If you have a known harmful gene mutation, the surgical plan for your breast cancer treatment may change. We may give you the option to consider removal and reconstruction of both breasts instead of undergoing a lumpectomy. The reason for this is that even after successful treatment of your known cancer, you may have a significant risk of developing a new cancer in the remaining breast tissue on the same side, or a new tumor on the opposite side in future.
I am afraid to undergo genetic testing- what if I get a bad report?
If you have a significant family history and have seen other family members struggle with cancers, it is natural to be apprehensive of your own risk. Knowledge of this risk however should be used as a tool to make positive health decisions.
If I am BRCA positive, will my children be tested?
If you carry the gene, a biological child has a 50% probability of inheriting the genetic mutation. Genetic testing for BRCA and similar mutations is only done after the child is18 years of age when he or she can understand the testing process, its implications, and give consent for testing. The children who do not inherit the gene have the same cancer risk as the average population, which can be a source of great relief in the background of strong family history. If they do test positive they will be offered options similar to those mentioned before.
Is breast cancer hereditary?
Around 5-10 percent of breast cancers can be attributed to known genetic mutations. Upto 20 percent cases may be familial even if no mutations are known or found. The vast majority of patients who have breast cancer, have no family history and are called 'sporadic'.
What genetic defects can cause breast cancer?
80-90% of hereditary breast cancer is caused by mutations in BRCA1 or BRCA2 gene. TP53, PTEN,CDH1, ATM, CHEK2 and PALB2 are other genes responsible for familial cancers.
What is the cancer risk in women with BRCA gene defects?
A patient with a harmful mutation in BRCA may have a 60-80% lifetime risk of developing breast and 40-60 % risk of developing ovarian or fallopian tube cancer. In a patient who has already developed breast cancer, the lifetime risk of developing a breast cancer in the opposite breast may be 40%-60%. These are rough estimates and individial risk may vary with the mutation and the pattern of family history.
Can a BRCA mutation be inherited from the father?
Yes ,risk of breast cancer risk can be inherited with equal probability from the mother or father. Paternal uncles, aunts, cousins and grandparents also contribute to your family hisotry.
What sample will be collected for the test?
As we are testing for inherited gene mutations that are present in all cells of the body, a blood sample or saliva swab can be used for the test. We usually collect 3ml of blood and send it to the genetics lab for testing.
How long does the genetic testing report take?
The genetics lab isolates DNA from the blood, then processes the DNA in several complex steps using specialized gene sequencing equipment. A large amount of data is generated in the process which needs detailed analysis, referencing and then interpretation. A genetic test report is generated, which describes any gene mutations which may be found. The entire process can take 4-8 weeks of time.
How much does genetic testing cost?
With use of Next Generation Sequencing, and availablity of the test locally, the cost of testing has decreased considerably, compared to what it was a few years ago. The initial cost can vary based on whether we are testing for specific gene mutations or a comprehensive panel. Once a familial mutation is known, other family members can be tested at much lower cost. Discuss what test that is right for you, with your breast specailist or genetic counsellor.