Sickle Cell Drug Misses Phase 3 Endpoint: Pfizer

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Pfizer says a Phase 3 study of its investigational sickle cell disease drug inclacumab failed to meet the primary endpoint. THRIVE-131 is evaluating inclacumab, a P-selectin inhibitor, in 241 patients aged 16 and older with sickle cell disease who experienced between two and 10 vaso-occlusive crises (VOCs) in the prior year. Participants received either intravenous inclacumab or a placebo every 12 weeks for 48 weeks, according to the company.

Pfizer says the data showed that the drug did not significantly reduce the rate of VOCs compared with placebo. Inclacumab was generally well tolerated, with the most common side effects including anemia, joint pain, back pain, headache, malaria, sickle cell anemia with crisis, and upper respiratory infections, it says.

The data appear to be another setback for the company’s sickle cell drug portfolio. Last September, Pfizer withdrew all lots of Oxbryta (voxelotor) based on the totality of clinical and real-world data, which suggested an imbalance in VOCs and fatal events at that time. After further evaluation, a Pfizer data assessment on Oxbryta has been completed and shared with FDA and EMA, according to the company. “Pfizer is committed to publishing a comprehensive analysis that includes additional Oxbryta data and analyses this year," it says.

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