Fluorescence in situ hybridization evaluation of minimal residual disease on stem-cell harvests.
The usefulness of fluorescence in situ hybridization (FISH) analysis to detect minimal residual disease (MRD) in autologous bone marrow and peripheral blood stem-cell harvests has been tested in three patients with hematologic malignancies. Conventional cytogenetics and FISH were used to characterize the leukemic clones identifying the specific chromosomal abnormalities (monosomy 7 in a myelodysplastic patient and trisomy 8 in two acute myeloid leukemic patients). Such analysis was useful to monitor the MRD persistent after treating these patients with intensive chemotherapy. The myelodysplastic patient underwent eight peripheral blood-stem cell harvests in which FISH detected the persistence of monosomy 7 cells, precluding their use for autologous transplantation. This patient relapsed and died. In two acute myeloid leukemia patients who underwent an autologous marrow harvest, FISH did not show a significant proportion of trisomy 8 cells. Nevertheless, autologous transplantation was not performed, owing to an insufficient CD34 cell content in the harvests. One of these patients relapsed with the reappearance of trisomy 8 and died. The other patient, on the contrary, is alive in complete remission 3 years after the bone marrow harvest. The usefulness and applicability of MRD quantification in stem-cell harvests is discussed on the basis of the sensitivity of the methodology applied.
Department of Haematology, Clínica Puerta de Hierro, Spain.
J L
JL
Díez-Martín
I
I
Buño
P
P
Llamas
J
J
Gosálvez
C
C
López-Fernández
N
N
Polo
C
C
Regidor
D000293:Adolescent; D000328:Adult; D002869:Chromosome Aberrations; D005260:Female; D018380:Hematopoietic Stem Cell Transplantation; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007951:Leukemia, Myeloid / Q000175:diagnosis / Q000235:genetics* / Q000628:therapy*; D015470:Leukemia, Myeloid, Acute / Q000175:diagnosis / Q000235:genetics / Q000628:therapy; D008297:Male; D008875:Middle Aged; D009190:Myelodysplastic Syndromes / Q000175:diagnosis / Q000235:genetics / Q000628:therapy; D018365:Neoplasm, Residual / Q000175:diagnosis*; D020858:Tissue and Organ Harvesting; D014182:Transplantation, Autologous