Abstract

The studies described here demonstrate that in vitro processing of cells before extraction of RNA has a major effect on the number and type of cytokine transcripts present within MDS and leukemia cells. Transcripts for GM-CSF, a cytokine whose production by leukemia cells is believed to play an important role in the pathogenesis of leukemia, was not detectable in 12/13 unprocessed AML specimens, in 12/12 MDS specimens, or in 7/7 CML specimens but once detected in many specimens after processing. These data strongly suggest that leukemia cell production of GMCSF rarely occurs in vivo.

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