PPIB and acute lymphoblastic leukemia: For pediatric acute lymphoblastic leukemia (ALL) flow cytometry data, with a limit of detection of 0.0001 for clonal B- or T-cell surface receptors, the “leukemia-associated immunophenotype” (LAIP), has been shown to correlate with significantly worse disease-free and overall survival (M. J [3].; M. J [2]).