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M94B0793.TXT
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1994-11-11
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36 lines
Document 0793
DOCN M94B0793
TI HIV lymphomas frequently carry mutations in the c-myc protein (Meeting
abstract).
DT 9412
AU Spangler G; Gaidano G; Hamdy N; Dalla-Favera R; Magrath I; Bhatia K;
Pediatric Branch, NCI, Bethesda, MD 20892
SO Proc Annu Meet Am Assoc Cancer Res; 35:A1141 1994. Unique Identifier :
AIDSLINE ICDB/94602827
AB Non-Hodgkin's lymphomas, particularly high grade B cell lymphomas, are
the most frequent malignancies diagnosed in patients infected with HIV.
We have previously reported the occurrence of point mutations in the
protein coding region of c-myc in approximately 60% of SNCL in non-HIV
infected patients. We have now screened the entire coding region of
c-myc in thirty HIV lymphomas and assessed the integrity of the c-myc
protein. Our results indicate that the c-myc protein is mutated in 50%
of the HIV lymphomas and 75% of small non-cleaved HIV lymphomas. Among
14 other histological subtypes tested (3 large cell non-cleaved, 3 Ki-1
positive and 8 immunoblastic lymphomas) only 2 immunoblastic lymphomas
carried c-myc mutations. Unlike intronic mutations, coding region
mutations were seen in some tumors that lacked a myc/Ig translocation.
However, among 19 tumors with a myc/Ig translocation, 9/11 which lacked
EBV had a c-myc mutation, whereas only 2 of 8 EBV positive tumors
contained a translocation. These mutations, unlike those that occur in
the intron, were also seen in tumors with no evidence of c-myc
translocation. The implications of these mutations in the genesis of HIV
lymphomas will be discussed.
DE Cell Transformation, Neoplastic/GENETICS Chromosome Aberrations Gene
Expression Regulation, Neoplastic/PHYSIOLOGY Gene Frequency Human
Lymphoma, AIDS-Related/*GENETICS Mutation/*GENETICS Proto-Oncogene
Proteins c-myc/*GENETICS MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).