AS expression in TEL-AML1–negative ALL determined by RTQ-PCR.AS expression in TEL-AML1–negative ALL patients sensitive (n = 10) and resistant to l-Asp (n = 14; P = .03) as determined by RTQ-PCR. AS mRNA expression is indicated in arbitrary units (AUs) and defined as the mRNA expression of AS relative to GAPDH × 100. ○ represents individual patients; bars represent the median values.