The peripheral blood represents an alternative source of haemopoietic progenitors and permits autografting in patients who have contraindications for a bone marrow harvest but who are otherwise candidates for autologous bone marrow transplantation. Circulating stem cells can be harvested performing several leucaphereses during the overshoot after a mobilization chemotherapy. The use of Fenwal CS-3000 cell separator allows reproducibility from donor to donor and makes the procedure very efficient. We collected peripheral blood stem cells (PBSC) in four patients, 2 with Hodgkin's lymphoma, 1 with high-grade non-Hodgkin's lymphoma and 1 with secondary FAB unclassifiable ANLL: the procedures of collection and cell harvests obtained are reported.