Chromosomal Patterns in Myelocytic Leukemia

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Abstract
To the Editor: Beck and Chesney recently presented the clinicopathological case, "Myelocytic Leukemia with an Unusual Chromosomal Pattern."1 Analysis of the karyotype with quinacrine fluorescence was interpreted as showing an extra No. 10, an extra No. 21, and 2 Ph1 chromosomes.I believe that there is a band of dully fluorescing material at the end of the long arm of the right-hand member of chromosome pair No. 9 in Figure 2 of the Case Report. It would be important to re-examine the original material to confirm my suspicion. I raise this point because I have observed an additional band of . . .