Abstract
Five cases of primary mediastinal B-cell lymphoma (PMBL) each have been studied with 375 microsatellite markers from all 22 autosomes. Of the 151 genomic alterations among the 1,875 assays, only five were allelic losses. The remainder of the microsatellite alterations consisted of 114 allelic imbalances and 32 instabilities. Microsatellite alterations were found in all cases on chromosomal arms 6p and 9p. These allelic imbalances most likely are indicative of genetic amplification, a finding agreeing well with those of studies using either comparative genomic hybridization or arbitrarily primed polymerase chain reaction, in which amplification of chromosome arm 9p in PMBL has been found. The allelic imbalances on chromosome arm 6p always included marker D6S276 located at 6p21.3-p22.3, where the MHC class I genes reside. These allelic imbalances may be reflective of alterations in the expression of the MHC gene products, characteristic of PMBL. Allelic anomalies close to the MYB gene locus on 6q were detected in two cases and prompted the analysis of MYB rearrangements in a series of 30 lymphomas. One rearrangement was detected in one of 18 cases of PMBL and in none of 10 diffuse, large B-cell lymphomas and two T-cell lymphomas....Continue Reading
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