Genetic Testing: What to Know
- Genetic testing is recommended at ovarian cancer diagnosis.
- Testing helps identify gene mutations that can guide treatment.
- Germline genetic testing looks for genetic mutations throughout the body.
- Somatic testing looks for mutations within the tumor.
According to some estimates, 80 percent of women diagnosed with ovarian cancer are not offered genetic testing. Providers like Dr. Melissa Geller, a gynecologic oncologist at the University of Minnesota Health Cancer Care, say that number needs to change because the tests can inform women and their doctors about the best treatment options for their specific cancer.
“When I see a newly diagnosed ovarian cancer patient, I strongly recommend they undergo genetic counseling and testing early on in their disease,” Dr. Geller says. And the sooner a woman is armed with this information, the better.
PARP inhibitors are drugs that work to prevent damaged cancer cells from repairing themselves and subsequently spreading. This makes PARP drugs a particularly good option for helping to ward off cancer recurrence.
When a patient is diagnosed with ovarian cancer, Dr. Geller also sends their tumor out for testing as well.
There are two types of mutations doctors look for from genetic testing: germline (or hereditary) and somatic. Germline testing looks for genetic mutations that are present in the whole body. So whether it’s a skin cell, a breast cell, or a colon cell that’s being examined, they will all show the same mutation. These mutations can be passed down from parent to child, so the test results not only inform women of their own cancer risks but also those of family members.
The other type of genetic testing is called somatic testing. “Somatic mutations occur within the tumor itself, sometimes as a result of the type of cancer that you have,” Dr. Geller says. Oncologists call these driver mutations that can help doctors and patients choose the best available treatment options. “Even if someone is BRCA-1 or -2 negative, or is germline-mutation negative, the good news is, there’s still hope that their tumor may have these somatic mutations.”
If so, they may be more likely to respond to a PARP inhibitor.
While initially, women with a BRCA-1 or BRCA-2 genetic mutation had been shown to respond especially well to PARP inhibitors after recurrence, and then in what’s called maintenance therapy, newer research has shown that women with the BRCA gene mutation (and indeed almost all women), can consider using PARP inhibitors throughout their treatment. Most recently, the Food and Drug Administration has approved niraparib (brand name ZEJULA) for almost all women regardless of whether they have the BRCA mutation, as part of an initial course of treatment, or what’s called front-line treatment.
However Dr. Amanika Kumar of The Mayo Clinic who spoke to SurvivorNet, cautioned that women still need to speak with their doctor to evaluate the benefit of taking a PARP inhibitor to extend life, because there are very real side effects due to the toxicity of the drug. “Patients with HRD (homologous recombination deficiency) have a far better response than those without and those with BRCA mutations even more so. It is on us as clinicians to help patients understand the risks and benefits of treatment. Patients that have no mutation or HRD may choose not to go on maintenance (in fact I recommend they don’t) because there is real toxicity to these meds.”
Because every cancer is different, genetic testing allows doctors to tailor treatment specifically for each patient.
Learn more about SurvivorNet's rigorous medical review process.
Dr. Melissa Geller is a gynecologic oncologist at the University of Minnesota. Read More
Genetic Testing: What to Know
- Genetic testing is recommended at ovarian cancer diagnosis.
- Testing helps identify gene mutations that can guide treatment.
- Germline genetic testing looks for genetic mutations throughout the body.
- Somatic testing looks for mutations within the tumor.
According to some estimates, 80 percent of women diagnosed with ovarian cancer are not offered genetic testing. Providers like
Dr. Melissa Geller, a gynecologic oncologist at the
University of Minnesota Health Cancer Care, say that number needs to change because the tests can inform women and their doctors about the best treatment options for their specific cancer.
“When I see a newly diagnosed ovarian cancer patient, I strongly recommend they undergo genetic counseling and testing early on in their disease,” Dr. Geller says. And the sooner a woman is armed with this information, the better.
Read More
PARP inhibitors are drugs that work to prevent damaged cancer cells from repairing themselves and subsequently spreading. This makes PARP drugs a particularly good option for helping to ward off cancer recurrence.
When a patient is diagnosed with ovarian cancer, Dr. Geller also sends their tumor out for testing as well.
There are two types of mutations doctors look for from genetic testing: germline (or hereditary) and somatic. Germline testing looks for genetic mutations that are present in the whole body. So whether it’s a skin cell, a breast cell, or a colon cell that’s being examined, they will all show the same mutation. These mutations can be passed down from parent to child, so the test results not only inform women of their own cancer risks but also those of family members.
The other type of genetic testing is called somatic testing. “Somatic mutations occur within the tumor itself, sometimes as a result of the type of cancer that you have,” Dr. Geller says. Oncologists call these driver mutations that can help doctors and patients choose the best available treatment options. “Even if someone is BRCA-1 or -2 negative, or is germline-mutation negative, the good news is, there’s still hope that their tumor may have these somatic mutations.”
If so, they may be more likely to respond to a PARP inhibitor.
While initially, women with a BRCA-1 or BRCA-2 genetic mutation had been shown to respond especially well to PARP inhibitors after recurrence, and then in what’s called maintenance therapy, newer research has shown that women with the BRCA gene mutation (and indeed almost all women), can consider using PARP inhibitors throughout their treatment. Most recently, the Food and Drug Administration has approved niraparib (brand name ZEJULA) for almost all women regardless of whether they have the BRCA mutation, as part of an initial course of treatment, or what’s called front-line treatment.
However Dr. Amanika Kumar of The Mayo Clinic who spoke to SurvivorNet, cautioned that women still need to speak with their doctor to evaluate the benefit of taking a PARP inhibitor to extend life, because there are very real side effects due to the toxicity of the drug. “Patients with HRD (homologous recombination deficiency) have a far better response than those without and those with BRCA mutations even more so. It is on us as clinicians to help patients understand the risks and benefits of treatment. Patients that have no mutation or HRD may choose not to go on maintenance (in fact I recommend they don’t) because there is real toxicity to these meds.”
Because every cancer is different, genetic testing allows doctors to tailor treatment specifically for each patient.
Learn more about SurvivorNet's rigorous medical review process.
Dr. Melissa Geller is a gynecologic oncologist at the University of Minnesota. Read More
