Expression of lung resistance-related protein (LRP) in initial and relapsed childhood acute lymphoblastic leukemia.

Thirty-eight children with initial and 25 children with relapsed lymphoblastic leukemia (ALL) were analyzed for the expression of LRP (lung resistance protein or p110 major vault protein) using immunocytochemistry. LRP expression was found in 18 of 38 (47%) children with initial ALL and in 17 of 25 (68%) children with relapsed ALL. Children with initial ALL and without LRP expression had significantly longer relapse-free intervals than patients with LRP expression.