[Umbilical cord hematopoietic precursors transplantation. Report of five patients].

Hematopoietic precursors transplantation is a therapeutic alternative for leukemia, some metabolic diseases and some immune deficiency syndromes. In its allogeneic variety leukemia eradication is based in the conditioning prior to transplantation and the allograñ effect against leukemia. Umbilical cord blood is an alternative source of hematopoietic precursors when there are no HLA compatible relatives available.