Genetic Counseling Now Recommended for Children with Sarcoma

From http://blog.dana-farber.org/insight/2012/01/children-with-sarcoma-should-have-genetic-testing-say-specialists/

If your son or daughter has been diagnosed with a type of sarcoma – a tumor in connective tissue like muscles or bones – there are many questions: Will my child make a full recovery? What are the immediate and long-term side effects of treatment?

Most parents don’t consider whether their child will face a second cancer later in life.

However, a link between sarcomas and Li-Fraumeni syndrome, a rare condition that raises a person’s risk of developing one or more cancers to as high as 85 percent, has led genetic specialists at Dana-Farber/Children’s Hospital Cancer Center (DF/CHCC) to recommend that all child sarcoma patients be offered genetic counseling for Li-Fraumeni syndrome. 

“Identification of an inherited gene alteration can sometimes help guide current treatment decisions and may also help with early detection and cancer prevention in the future,” says Carly F. Grant, MS, CGC, a genetic counselor of the Pediatric Cancer Risk Program at DF/CHCC, one of the first programs in the country that provides multidisciplinary consultative care to patients and their families whose condition or family history suggests an increased risk of cancer.

Li-Fraumeni syndrome was first described in 1969 by Dana-Farber physician-scientist Frederick Li, MD, and his mentor, Joseph Fraumeni Jr., of the National Cancer Institute. In 1990, researchers discovered that the increased risk of cancer associated with the syndrome is caused by inherited changes in a gene called p53 – a finding that made genetic testing for Li-Fraumeni syndrome possible.

Cancers typically diagnosed in patients with Li-Fraumeni syndrome include breast cancer, sarcomas (including soft tissue and osteosarcomas but not Ewing sarcoma), brain tumors, acute leukemia, and adrenal cortical carcinoma. Recently, the list has been expanded to include colon cancer and stomach cancer, following discoveries by Dana-Farber researchers Sapna Syngal, MD, MPH, Serena Masciari, MD, and Judy Garber, MD, MPH, co-director of Dana-Farber’s Cancer Genetics and Prevention Program.

While fewer than 1,000 families with Li-Fraumeni syndrome have been identified worldwide, research has shown that childhood sarcomas are one of the characteristic cancers associated with Li-Fraumeni syndrome.

Less than 10 percent of children with sarcomas harbor a p53 mutation, and while most children inherit the p53 mutation from a parent, it’s also possible for someone to be born with a new mutation. There’s a 50/50 chance of passing on a p53 mutation to the next generation.

There are benefits and drawbacks to genetic testing for the p53 mutation; genetic counselors can provide families with the information they need to make informed decisions about their child’s care.

For example, since people with Li-Fraumeni syndrome are especially sensitive to radiation, which has been linked to the development of future cancers in some patients, knowing whether or not a child carries a p53 mutation may help the care team weigh the benefits and risks of radiation treatment.

And since the p53 mutation is typically inherited, there may be other family members at risk who would also have the option of being tested. Children who test positive can then be more carefully monitored by their physicians, while adults may be advised to have screening at an earlier age and more frequently for certain cancers.

The information may also be helpful for adults with Li-Fraumeni syndrome who are already being treated for cancer. Garber is pursuing leads suggesting that breast cancers in Li-Fraumeni syndrome patients could be treated by the targeted drug Herceptin.

While there have been few effective cancer screening methods specifically for people with Li-Fraumeni syndrome, new screening methods are emerging.

In an encouraging study published in 2008 by Garber, Masciari, Syngal, and other Dana-Farber physician-scientists, PET-CT scans detected three cancers in 15 Li-Fraumeni patients who were not experiencing any symptoms.

In the coming months, Dana-Farber scientists led by Lisa Diller, MD, will be launching a new study testing the effectiveness of rapid full-body MRI scans for children and adults with Li-Fraumeni syndrome. The goal is to learn how to find and treat cancers effectively in people with Li-Fraumeni syndrome.

Diller and Allison O’Neill, MD, and other Dana-Farber/Children’s Hospital Cancer Center scientists are also working to launch a national study on other screening options.

“Genetic testing may provide important information about cancer risks and medical management options that can be invaluable to a patient and their team of oncologists and specialists,” Grant says.

If you’re interested in discussing the option of genetic counseling for your child, please contact the Pediatric Cancer Risk Program at 617-632-4298.