Immunohistochemical characterization of cutaneous drug eruptions by STI571

Drug eruption caused by STI571 was mostly expressed as a maculopapular exanthema. The histopathological findings were similar in drug eruption by antibiotics or STI571. Unlike the drug eruptions caused by antibiotics, where the expression of CD4 was dominant, CD8 was dominant in drug eruptions by STI571. The expression of IL-18 and IL-1β was increased in both groups. This elevation of IL-18 and IL-1β may assist in understanding the pathogenesis of cutaneous drug eruption.