Production of IL-4 by CCR3⁺ tumor cells.

Intracellular flow cytometric analysis of cytokine expression shows that the majority of CCR3-bearing cells express IL-4 protein but not IFN-γ (IL-4–IFN-γ ratio, 24:1). Analysis gated on CCR3⁺ population (patient no. 8). Data shown are representative of 3 experiments.