Cupro-zinc superoxide dismutase: a possible biologic marker for alcoholism (studies in black patients).

Cupro-zinc superoxide dismutase (SOD-1) was measured by competition radioimmune assay of erythrocyte lysates of alcoholic and control subjects. Normal amounts of SOD-1 were found in the extract from control subjects (815 ng/mg Hb) and from white alcoholics (874 ng/mg Hb). However, the level of SOD-1 in lysates from black alcoholics (1033 ng/mg Hb) was significantly increased (p = 0.0001, rank sum test) compared with black and white controls. This increase was not related to any other observed hematologic disorder or to any historical, demographic, or laboratory value examined.