Even after endorsement in updated guidelines, hydroxyurea is substantially underused in youth with sickle cell anemia (SCA), new research indicates.
SCA can lead to pain crises, stroke, and early death. Hydroxyurea, an oral disease-modifying medication, can reduce the complications.
In 2014, the National Heart, Lung, and Blood Institute published revised guidelines that hydroxyurea should be offered as the primary therapy to all patients who were at least 9 months old and living with SCA, regardless of disease severity.
Low uptake even after guideline revision
Yet, a research team led by Sarah L. Reeves, PhD, MPH, with the Child Health Evaluation and Research Center at University of Michigan, Ann Arbor, found in their study of use in two sample states – Michigan and New York – that hydroxyurea use was low in children and adolescents enrolled in Medicaid and increased only slightly in Michigan and not at all in New York after the guideline revision.
After the guidelines were updated, the researchers observed that, on average, children and adolescents were getting the medication less than a third of the days in a year (32% maximum in the year with the highest uptake). The data were gathered from a study population that included 4,302 youths aged 1-17 years with SCA.
Findings were published online in JAMA Network Open.
‘A national issue’
Russell Ware, MD, PhD, chair of hematology translational research at Cincinnati Children’s Hospital, who was not part of the research, says that though data were gathered from Michigan and New York, “this is a national issue.”
Dr. Ware says the main problem is the way the health system describes the importance of hydroxyurea.
“There needs to be a realization that hydroxyurea is the standard of care for children with sickle cell anemia. It’s not just something they should take when they’re sick,” Dr. Ware said.
He added, “If you have diabetes, should you only take insulin if you’re really sick and hospitalized with a diabetic coma? Of course not.”
He said often providers aren’t giving a clear and consistent message to families.
“They’re not all sure they want to recommend it. They might offer it,” Dr. Ware said, which jeopardizes uptake. “Providers need to be more committed to it. They need to know how to dose it.”
Bad rap from past indications
Dr. Ware says hydroxyurea also gets a bad rap from use decades ago as a chemotherapeutic agent for cancer and then as an anti-HIV medication.
Now it’s used in a completely different way with SCA, but the fear of the association lingers.
“This label as a chemotherapeutic agent has really dogged hydroxyurea,” he said. “It’s a completely different mechanism. It’s a different dose. It’s a different purpose.”
The message to families should be more direct, he says: “Your child has sickle cell anemia and needs to be on disease-modifying therapy because this is a life-threatening disease.”
The underuse of this drug is particularly ironic, he says, as each capsule, taken daily, “costs about fifty cents.”
