Waldenstro¨M's Macroglobulinemia Is a Biological Syndrome Which May
Correspondence 1637 cation,10 particularly in acute promyelocytic leukemia (APL), we References searched for genomic similarities. The few specific studies in existence on sequence analysis of the PML-RAR␣ gene show that the breakpoint within the involved gene (usually the PML locus) is variably situated, 1 Saglio G, Guerrasio A, Tassinari A, Ponzetto C, Zaccaria A, Testoni and that the corresponding fusion transcript should be aberrant. The P, Celso B, Rege Cambrin G, Serra A, Pegoraro L. Variability of the ␣ resulting PML-RAR proteins contained residues not homologous with molecular defects corresponding to the presence of a Philadelphia ␣ either PML or RAR . These reported atypical breaks were very similar chromosome in human hematologic malignancies. Blood 1988; to the one recorded in our case. A second original characteristic of 72: 1203–1208. the BCR break reported by us is that an intronic sequence derived 2 Chissoe SL, Bodenteich A, Wang YF, Wang YP, Burian D, Clifton from abl intron Ib was juxtaposed to bcr exon. This is another unpre- SW, Crabtree J, Freeman A, Iyer K, Jian L. Sequence and analysis cedented feature for a CML patient, although on rare occasions it has 10 of the human ABL gene, the BCR gene, and regions involved in been reported in AML patients. So, it may be speculated that in a the Philadelphia chromosomal translocation. Genomics 1995; 27: small proportion of the DNA breaks that occurs in leukemia, a cur- 67–82. rently unknown molecular mechanism could break the coding DNA. 3 Saglio G, Guerrasio A, Rosso C, Zaccaria A, Tassinari A, Serra A, The resulting RNA remains in-frame coding an aberrant or, as in our Rege-Cambrin G, Mazza U, Gavosto F.
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