A group of oncologists is urging the Food and Drug Administration to review a new, flat-pricing strategy for all doses of ibrutinib (Imbruvica), calling the shift potentially dangerous for patients.
Pharmacyclics, an AbbVie company based in Sunnyvale, Calif., recently introduced a new, single-tablet formulation of ibrutinib in varying strengths (140 mg, 280 mg, 420 mg, and 560 mg) and set a flat price across all doses. At the same time, they removed the drug’s original 140-mg capsules – which cost about a third of the new, flat-rate price – from the market. The drug company says the new, single-tablet formulations give patients a convenient, once-a-day dosing regimen that could improve therapy adherence.
Ibrutinib is approved to treat a number of hematologic cancers, including mantle cell lymphoma, chronic lymphocytic leukemia/small lymphocytic lymphoma, Waldenstrom macroglobulinemia, and marginal zone lymphoma.
But in an April letter published in the Cancer Letter, nine physicians from cancer centers across the country expressed concern that the new dosage and pricing scheme could compromise patient safety and limit doctors’ dosage decisions.
“While the prescribing information is complex, prescribers and patients have had the flexibility of taking anywhere from one to four 140-mg capsules, readily permitting dose reduction to all but the lowest labeled dose [70 mg],” the authors wrote. “However, the new formulation and its associated marketing scheme [YOU&i] greatly impact the ability of the prescriber and patient to follow the prescribing information, resulting in the potential for a greatly enhanced risk of toxicities relative to that observed in the clinical trials which utilized multiples of the 140-mg capsules.”
The problems stem from a cancer drug that often requires dosage adjustments, the authors noted. The specific dosage for an ibrutinib patient depends on the indication, prior toxicities, concomitant medications, occurrence of ibrutinib intolerance, and current hepatic function. Because of such diverse criteria, dosage modifications are made frequently.
The new pricing system makes it harder for physicians to adjust the dose without running afoul of insurers and potentially affecting access for patients.