PGJ2 increases the sensitivity of leukemia cells to PTL. Average percent viability for CD34⁺CD38^- cells normalized to untreated controls. Three AML, 3 bcCML, and 3 normal specimens were treated for 18 hours with 0.5 μM PGJ2 (▦), 2.5 μM PTL (□), or both (▨). Each error bar represents the SD. All assays were performed in triplicate.