28.02.2013 Views

autologous blood and marrow transplantation - Blog Science ...

autologous blood and marrow transplantation - Blog Science ...

autologous blood and marrow transplantation - Blog Science ...

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

Table 1. Study 1 patient characteristics<br />

Radford et al. 485<br />

Category n Category n<br />

n 12 FAB category<br />

Age (years) 42 (25-66) RA 3<br />

Sex RARS 1<br />

Male 5 RAEB 6<br />

Females 7 RAEBt 2<br />

Prior therapy Transplant indication 2<br />

Chemotherapy 11 Breast cancer 4<br />

Radiotherapy 0 Non-Hodgkin's lymphoma 4<br />

None 1 Hodgkin's lymphoma 3<br />

Transplant type Melanoma 1<br />

Bone <strong>marrow</strong> 8<br />

Bone <strong>marrow</strong>/PBSC 1<br />

CD34-selected PBSC 1<br />

mAb-purged bone <strong>marrow</strong> 1<br />

PBSC 1<br />

mAb, monoclonal antibody; PBSC, peripheral <strong>blood</strong> stem cell; RA, refractory anemia;<br />

RARS, refractory anemia with ringed sideroblasts; RAEB, refractory anemia with exces<br />

blasts; RAEBt, refractory anemia with ringed sideroblasts in transformation.<br />

if conventional G-b<strong>and</strong>ing cytogenetic analysis confirmed the presence of an<br />

MDS-related clonal cytogenetic abnormality for which a FISH probe was<br />

available, mononuclear cells were isolated by density-gradient centrifugation <strong>and</strong><br />

sorted into CD34-positive <strong>and</strong> CD34-negative fractions using an immunomagnetic<br />

system (mini-MACS; Miltenyi Biotec). Successful sorting was confirmed by light<br />

microscopy, immunoperoxidase staining, <strong>and</strong> when sufficient cells were available,<br />

flow cytometry. FISH analysis was then carried out on both fractions using probes<br />

corresponding to each patient's known karyotypic abnormality.<br />

The characteristics of the évaluable patients are summarized in Table 2.<br />

RESULTS<br />

Study 1 : Analysis of pretransplant progenitors<br />

Data from the 12 évaluable cases are summarized in Fig. 1. In nine of 12 cases,<br />

the cytogenetic abnormality detected posttransplant (at the time of diagnosis of<br />

posttransplant MDS) using conventional cytogenetic analysis could also be detected<br />

in pretransplant <strong>marrow</strong> or stem cell specimens using FISH. The percentage of<br />

analyzed cells belonging to the abnormal clone ranged from 20 to 46% in the

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!