Non-small-cell lung cancer associated with excessive eosinophilia and secretion of interleukin-5 as a paraneoplastic syndrome.

Eosinophilia associated with solid tumors is an infrequent occurrence. The pathogenesis of tumor-associated eosinophilia is not well understood. Interleukin-5 (IL-5) is a cytokine that has been implicated in the development of eosinophilia in mice and humans.