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Leuk Res. 2002 Oct;26(10):899-902.

Less apoptosis in patients with 5q-syndrome than in patients with refractory anemia.

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Department of Hematopathology, The University of Texas, M.D. Anderson Cancer Center, 1515 Holcombe Boulevard, P.O. Box 72, Houston, TX 77030-4095, USA.


The WHO classification of hematological malignancies includes 5q-syndrome as a separate category within myelodysplastic syndromes (MDS). Clinically, patients with 5q-syndrome have a milder disease than patients with other MDS. The basis for this difference is not known. Identifying 5q-syndrome can be difficult because some of its morphologic and cytogenetic features are similar to those of other MDS. We compared apoptosis between 5q-syndrome and other refractory anemias. We found lower levels of apoptosis in 5q-syndrome as detected by less disruption of mitochondrial potential (P=0.008) and decreased annexin V positivity (P=0.01). Our results suggest that lower apoptosis in 5q-syndrome may explain the milder clinical course of the disease and distinguish 5q-syndrome from other MDS.

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