Background: There has been recent interest in the possible role of reperfus
ion-induced inflammation with neuronal injury after stroke. Enlimomab, a mu
rine intercellular adhesion molecule-1 (ICAM-1) antibody, reduces leukocyte
adhesion and infarct size in experimental stroke studies. The purpose of t
he current clinical trial was to evaluate the use of enlimomab after ischem
ic stroke. Methods: A total of 625 patients with ischemic stroke were rando
mized to receive either enlimomab (n = 317) or placebo (n = 308) within 6 h
ours of stroke onset. Treatment was given over 5 days. Patients were evalua
ted at baseline and on days 5 and 90 after initiation of treatment; long-te
rm assessments were carried out after 6 and 12 months. The primary efficacy
endpoint was the response to therapy at 90 days on the Modified Rankin Sca
le; other endpoints included Barthel Index (BI) and NIH Stroke Scale and su
rvival. Results: At day 90, the Modified Rankin Scale score was worse in pa
tients treated with enlimomab than with placebo (p = 0.004). Fewer patients
had symptom-free recovery on enlimomab than placebo (p = 0.004), and more
died (22.2 versus 16.2%). The negative effect of enlimomab was apparent on
days 5, 30, and 90 of treatment (p = 0.005). There were significantly more
adverse events with enlimomab treatment than placebo, primarily infections
and fever. Patients experiencing fever were more likely to have a poor outc
ome or die. Conclusions: The authors conclude that anti-ICAM therapy with e
nlimomab is not an effective treatment for ischemic stroke in the model stu
died and, indeed, may significantly worsen stroke outcome.