A new test could save arthritis patients time, money and pain. But will it be used?

PO1 William "Chip" Nagel
..."What testing could do
Medicare and commercial insurers haven't yet set a price for PrismRA, but it could save insurers thousands of dollars a year for each patient it helps, according to Krishna Patel, Scipher's associate director of medical affairs.

"If the test cost $750, I still only need it once, and it costs less than a month of whatever drug is not going to work very well for you," said Curtis, a co-author of some studies of the test. "The economics of a biomarker that's anything but worthless is pretty favorable because our biologics and targeted drugs are so expensive."

Patients are enthusiastic about the test because so many have had to take TNFis that didn't work. Many insurers require patients to try a second TNFi, and sometimes a third.

Jen Weaver, a patient advocate and mother of three, got little benefit from hydroxychloroquine, sulfasalazine, methotrexate, and Orencia, a non-TNFi biologic therapy, before finding some relief in another, Actemra. But she was taken off that drug when her white blood cells plunged, and the next three drugs she tried — all TNFis — caused allergic reactions, culminating with an outbreak of pus-filled sores. Another drug, Otezla, eventually seemed to help heal the sores and she's been stable on it since in combination with methotrexate, Weaver said.

"What is needed is to substantially shorten this trial-and-error period for patients," said Shilpa Venkatachalam, herself a patient and the director of research operations at the Global Healthy Living Foundation. "There's a lot of anxiety and frustration, weeks in pain wondering whether a drug is going to work for you and what to do if it doesn't." A survey by her group found that 91% of patients worried their medications would stop working. And there is evidence that the longer it takes to resolve arthritis symptoms, the less chance they will ever stop.

How insurers will respond to the availability of tests isn't clear, partly because the arrival of new biosimilar drugs — essentially generic versions — are making TNFis cheaper for insurance plans. While Humira still dominates, AbbVie has increased rebates to insurers, in effect lowering its cost. Lower prices make the PrismRA test less appealing to insurers, since widespread use of the test could cut TNFi prescriptions by up to a third.

However, rheumatologist John Boone in Louisville, Kentucky, found to his surprise that insurers mostly accepted alternative prescriptions for 41 patients whom the test showed unlikely to respond to TNFis as part of a clinical trial. Boone receives consulting fees from Scipher.

Although the test didn't guarantee good outcomes, he said, the few patients given TNFis despite the test results almost all did poorly on that regimen.

Scientists from AbbVie, which makes several rheumatology drugs in addition to Humira, presented a study at the San Diego conference examining biomarkers that might show which patients would respond to Rinvoq, a new immune-suppressing drug in a class known as the JAK inhibitors. When asked about its use of precision medicine, AbbVie declined to comment.

Over two decades, Humira has been a blockbuster drug for AbbVie. The company sold more than $3.5 billion worth of Humira in the third quarter of 2023, 36% less than a year ago. Sales of Rinvoq, which AbbVie is marketing as a treatment for patients failed by Humira and its class, jumped 60% to $1.1 billion."...