In-vitro inhibition of leucocyte migration in Crohn's disease by a sarcoid spleen suspension.

A Kveim suspension has been shown to inhibit the migration of leucocytes in vitro from 12 out of 18 patients with Crohn's disease but to have no comparable effect on leucocytes from patients with ulcerative colitis or from a group of patients with other diseases. These findings provide further evidence of cross-reactivity or of a possible aetiological link between Crohn's disease and sarcoidosis and suggest a further immunological distinction between Crohn's disease and ulcerative colitis.