Get to know teprotumumab
Rheumatologists who operate an infusion center are likely to increasingly be called upon by endocrinologists and ophthalmologists to administer intravenous teprotumumab-trbw (Tepezza), a human monoclonal antibody directed against the insulin-like growth factor 1 receptor that was approved earlier this year by the Food and Drug Administration as the first-ever drug for thyroid eye disease, a disfiguring and potentially blinding condition.
“This is really exciting,” Dr. Wells said. “The disease has an acute inflammatory stage, and that’s when you’ll be called on to give this drug. It makes a dramatic difference. Once a patient gets to the scarring phase there’s not a whole lot they can do other than surgery.”
In the pivotal phase 3 randomized trial, 83% of the teprotumumab group achieved the primary endpoint, a reduction in proptosis, or eye bulging, of at least 2 mm at week 24, compared with 10% of placebo-treated controls. The number needed to treat was 1.4. The chief side effects were muscle spasms, hair loss, fatigue, and nausea.
“You might say, ‘two millimeters, that’s nothing.’ But the primary drug used before teprotumumab was IV steroids, and there a 0.6-mm reduction in proptosis was considered improvement,” Dr. Wells observed.
Obtaining payer approval
“I’ve found over the last 10 years that when it comes to eye disease, insurance companies have a little more wiggle room,” he said. “They’re not going to let somebody go blind. You can get the references I’ve mentioned and show them the data. After all, we only have one biologic drug that’s been approved, and not everybody responds to it.
“Titrate your therapy based upon the intraocular pressure, the number of inflammatory cells in the anterior chamber, and any visual changes. You’ve got to be very aggressive with therapy, and don’t take no for an answer from the insurance companies,” he advised.
Dr. Wells reported serving as a member of an advisory board and/or speakers bureau for more than a dozen pharmaceutical companies.