Antileukemia CTLp frequency in AML patients undergoing A-BMT. Antileukemia CTLp frequencies were evaluated in pretransplantation PBMCs (▦), postpurging BM cells (▨), PBMCs 2 months after transplantation (▪), and PBMCs 6 months after transplantation (□). Results are expressed as number of CTLp's for 10⁶ cells. In patients 7, 12, 14, and 16 pretransplantation BM cells for evaluation of CTLp frequency were not available. Patients 9, 10, 11, and 14 had relapses after A-BMT (see Table 2 and “Results”).