NUCALA ACHIEVED AND MAINTAINED NORMAL EOSINOPHIL LEVELS

The reduction in blood eosinophils observed at Week 8 in the NUCALA group was maintained overall through Week 321,2

BLOOD EOSINOPHIL COUNT RATIO TO BASELINE

Blood eosinophil count ratio to baseline Blood eosinophil count ratio to baseline
Baseline: 1460 cells/µL: 92% reduction in eosinophils at Week 32 vs placebo (Week 32: 70 cells/µL)

All results are descriptive.
The clinical significance of these pharmacodynamic data is unknown.

Note: Mean normal blood eosinophil levels in a general population of subjects without confounding factors have been reported as 100 cells/µL (range: 34-257) and 107 cells/µL (5th, 95th percentile: 30, 395); levels vary based on age, sex, environmental exposures and comorbid conditions.3,4

*Placebo, 870 cells/µL at Week 32 (1350 cells/µL at baseline). Counts given as geometric mean.

Pivotal study design

How NUCALA targets eosinophils

Diagram showing how NUCALA (mepolizumab) targets eosinophils

The mechanism of action of mepolizumab in HES has not been definitively established.

  • IL-5 binds to complex on EOS

    Interleukin-5 (IL-5) is the major cytokine responsible for eosinophil growth and survival. IL-5 binds to the IL-5 receptor complex expressed on the eosinophil surface. 

  • How IL-5 impacts EOS

    Downstream signaling by IL-5 promotes the growth and differentiation, recruitment, activation, and survival of eosinophils. 

  • NUCALA targets IL-5

    NUCALA, a humanized monoclonal antibody, targets IL-5 and binds to it. NUCALA blocks IL-5 binding to the alpha chain of the IL-5 receptor complex. 

  • How NUCALA reduces EOS

    NUCALA inhibits IL-5 signaling, reducing the production and survival of eosinophils.

What role do blood eosinophils play?

Eosinophils play a role in maintaining health, which includes regulating the immune system, regenerating and repairing tissue, and host protection (eg, defending the body against parasitic infections).5 In HES, hypereosinophilia is associated with organ dysfunction or damage.6

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