- This month the FDA has approved a treatment for an inherited blood disorder.
- The Casgevy treatment was developed through CRISPR gene-editing technology and involves modifying a person’s own blood stem cells and then transplanting them back.
- The treatment can now be used for a type of blood disorder that results in anemia.
The FDA approved the therapy to treat a condition called transfusion-dependent beta-thalassemia (TDT), an inherited blood disorder that results in anemia and frequent blood transfusions.
Casgevy, a treatment developed through CRISPR gene-editing technology, involves modifying a person’s own blood stem cells and then transplanting them back. Those altered cells then attach and multiply in the person’s bone marrow and facilitate the production of fetal hemoglobin, which can help with oxygen delivery. This approval makes the treatment the first of its kind for TDT.
“Today’s approval is an important step in the advancement of an additional treatment option for individuals with beta-thalassemia, a debilitating disease that places individuals at risk of many serious health problems,” said
Sickle cell disease, also known as sickle cell anemia, is a genetic disease in which red blood cells have an abnormal crescent shape — hence the “sickle” part of the name. This makes them sticky and unable to bend, meaning they can get trapped in small vessels and block the flow of blood to different parts of the body. This can result in debilitating pain episodes and organ damage.
Symptoms of sickle cell anemia may appear in babies as early as 4 months old, but generally occur around the 6-month mark.
- excessive fatigue or irritability, from anemia
- fussiness, in babies
- bedwetting, from associated kidney problems
- jaundice, which is yellowing of the eyes and skin
- swelling and pain in hands and feet
- frequent infections
- pain in the chest, back, arms, or legs
Transfusion-dependent beta-thalassemia, also known as beta thalassemia major, is one of three variations of
“It manifests clinically as jaundice, growth retardation, hepatosplenomegaly, endocrine abnormalities, and severe anemia requiring life-long blood transfusions. Life-long transfusions also result in iron overload,” said Chaudhury.
Before this new gene therapy the treatment for the condition was a stem cell transplant or supportive care.
Casgevy, which will be produced by Vertex Pharmaceuticals and administered via authorized treatment centers, should be available to patients 12 years and older early this year.
With this cell therapy there is greater potential for a person to be cured for TDT and SCD with less short- and long-term side effects compared to a stem cell transplant.
And stem cell transplants that would have been stymied or delayed by a wait for appropriate donors can now be accelerated by using a person’s own cells through Casgevy, Chaudhury said.
“Before these therapies, the only available curative therapy was allogeneic stem cell transplant, which may have complications and was not accessible to all due to lack of appropriate donors,” Chaudhury said.
Chaudhury explained that some short- and long-term toxicities can occur with this treatment, which can result in nausea/vomiting, mucositis, risk for infections, hair loss, liver toxicity, pulmonary toxicity and infertility. And the cost — Vertex has listed it at $2.2 million for a single course of treatment — will likely create some significant issues with access for people who need it.
“The product is very expensive and will be accessible only to patients with insurance benefits. Will be cost prohibitive and likely inaccessible to patients in low income/low resource countries,” Chaudhury said, adding that there are also potential issues that could stem from other medical conditions. “Casgevy has not yet been tested in patients with stroke and neurological involvement in SCD or patients with TDT with severe iron overload with liver damage.”
Casgevy, a new gene-editing therapy for blood disorders, has been approved as a treatment for sickle cell disease and transfusion-dependent beta-thalassemia.
The potential for curing these two blood disorders, which can result in frequent blood transfusions and lifelong anemia, is enormous.
But the cost of a single course of treatment — $2.2 million — ultimately raises questions about accessibility.
Source link : https://www.healthline.com/health-news/crispr-therapy-approved-to-treat-blood-disorder-that-causes-anemia
Publish date : 2024-01-26 23:20:14
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