2008 Barcelona - European Society of Human Genetics
2008 Barcelona - European Society of Human Genetics
2008 Barcelona - European Society of Human Genetics
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Cancer genetics<br />
P04.103<br />
integrated cGH and microRNA analysis in mantle cell<br />
Lymphoma reveals miRNA signatures associated with specific<br />
cytogenetic changes<br />
C. Gomez-Abad 1 , L. Di Lisio 1 , N. Martinez 1 , B. Ferreira 2 , E. Rodriguez 1 , M.<br />
Sanchez-Beato 1 , J. Cruz Cigudosa 2 , M. A. Piris 1 ;<br />
1 Lymphomas Group, Molecular Pathology Program, CNIO, Madrid, Spain, 2 Cytogenetics<br />
Group. <strong>Human</strong> Cancer Genetic Program. CNIO, Madrid, Spain.<br />
Mantle Cell Lymphoma (MCL) is characterized by a t(11;14) translocation,<br />
which leads to Cyclin D1 overexpression . Although CGH and<br />
Expression pr<strong>of</strong>iling data in MCL has been investigated, until now no<br />
equivalent studies have been performed for miRNA . Here we explored<br />
the relation between miRNA expression pr<strong>of</strong>iling and CGH microarray<br />
data from a series <strong>of</strong> 20 MCL cases and 5 reactive tonsils<br />
MCL presents a unique miRNA signature revealing overexpression <strong>of</strong><br />
15 miRNAs and downregulation <strong>of</strong> 50 miRNAs in at least 50% <strong>of</strong> the<br />
cases, when compared with the average expression level <strong>of</strong> the controls<br />
. Some <strong>of</strong> these miRNAs have already been described in other<br />
tumor types, such as miR-143 and miR-145 downregulated in B-cell<br />
malignancies .<br />
CGH analysis in this series identifies a series <strong>of</strong> changes, roughly coinciding<br />
with thise described . We have investigated whether chromosomal<br />
gains and losses could explain the miRNA MCL signature .<br />
A microRNA pr<strong>of</strong>ile has been identified as associated to the most frequently<br />
chromosomal aberration described in MCL . Thus losses <strong>of</strong><br />
9p21-pter, 1p, 13q, 11q21; and gains <strong>of</strong> 15q and 3q were associated<br />
with distinctive miRNA changes .<br />
Taken together, MCL seems to combine a disease-specific miRNA signature<br />
that correlates with specific chromosomal changes.<br />
P04.104<br />
A rare karyotype including t(2;17) in a patient with<br />
myelodysplastic syndrome-derived acute myeloblastic leukemia<br />
F. Hazan, H. Akin, A. Vahabi, A. Alpman, F. F. Ozkinay, C. Ozkinay;<br />
Ege University Medical Faculty Medical <strong>Genetics</strong> Department, İzmir, Turkey.<br />
Myelodysplastic syndrome (MDS) is a clonal disorder characterized by<br />
dyshematopoiesis and high susceptibility to acute myeloid leukemia<br />
(AML). Complex chromosomal aberrations are present in ≤30% <strong>of</strong> patients<br />
with primary myelodysplastic syndrome (MDS) or acute myeloid<br />
leukemia (AML) and are associated with a poor prognosis . We report a<br />
45 year-old patient with MDS-AML . The Wright-Giemsa stained peripheral<br />
blood smears showed blast cells (WBC: 3180/mm3, Hb: 9 .69g/dl,<br />
Plt: 21100/mm3) . An abnormal karyotype 44,XX, t(2;17),-16,-18 was<br />
obtained on G-banded metaphases from unstimulated bone marrow<br />
aspirate cell culture . Cytogenetic studies <strong>of</strong> AML showed that isolated<br />
-16 and -18 were significantly more common. To our knowledge, isolated<br />
t(2;17) is not described in AML to date. This is the first report <strong>of</strong><br />
a patient presenting with a AML with t(2;17),-16,-18 . We evaluated the<br />
outcome <strong>of</strong> the treatment and the prognosis <strong>of</strong> the patient . As in our<br />
patient, this rare karyotype may be associated with poor prognosis .<br />
P04.105<br />
Increased incidence <strong>of</strong> monoclonal B-cell infiltrate in chronic<br />
myeloproliferative disorders. Report <strong>of</strong> four cases<br />
S. N. Kokkinou, K. Tzanidakis, A. Lindou, H. Alafaki, G. Floropoulou, R. Hatzikyriakou,<br />
G. Drosos;<br />
Cytogenetic Unit, Sismanoglion General Hospital, Halandri, Greece.<br />
INTRODUCTION: The coexistence <strong>of</strong> chronic myeloproliferative<br />
disorder(CMPD)and B-cell chronic lymphocytic leukemia(CLL)in the<br />
same patient is rare .<br />
AIM OF THE STUDY: We report 4 cases <strong>of</strong> CMPD/CLL simultaneously<br />
occurred .<br />
PATIENTS<br />
1 st patient:An Albanian man 57y with polycythemia Vera(PV) .<br />
2 nd patient:A woman73y with essential thrombocytosis (ET)<br />
3 rd patient:A man 83y with ET<br />
4 th patient:A man 78y with ET<br />
In paraffin sections <strong>of</strong> the bone marrow samples was found 15-18% <strong>of</strong><br />
monoclonal lymphocytic infiltrate CD5+,CD23+,CD10-,CD3-,ZAP-70-<br />
,CD79+simultaneously with the findings <strong>of</strong> CMPD.<br />
The patients were untreated and the trephine biopsies derived from the<br />
primary diagnostic procedure .In the Albanian patient a cervical lymph<br />
node(LN)was biopsied and the cell population was <strong>of</strong> Borigin<br />
METHODS: Bone marrow specimens(BM)and PB lymphocytes were<br />
cultured using standard techniques .Thirty GTG banded metaphases<br />
were analyzed (ISCN2005) .<br />
RESULTS: The karyotypes looked normal .For FISH we used the LSI<br />
IGH dual color, break apart rearrangement probe, LSI BCR/ABL ES<br />
dual color translocation probe and WCP CEP-8(VYSIS) .<br />
Two hundred interphase nuclei were counted .Up to25% <strong>of</strong> the cells<br />
carried the BCR/ABL translocation,and the IGH rearrangement .<br />
There was also monosomy <strong>of</strong> #8 in more than 10% <strong>of</strong> the cells<br />
CONCLUSIONS: Although the coexistence <strong>of</strong> CMPDand CLL is<br />
rare,we established that these two conditions in the PB,in the BM and<br />
in one LN is more frequent than expected .That implies that there is a<br />
predisposition for the development <strong>of</strong> monoclonal B-cell population .<br />
With FISH technique we demonstrated the coexistence <strong>of</strong> two diseases<br />
.Since we studied simultaneously PB,BM and a LN,we believe that<br />
CMPD and CLLsupport the hypothesis <strong>of</strong> multi step cancerogenesis<br />
P04.106<br />
molecular cytogenetic study <strong>of</strong> 69 patients with myelodysplastic<br />
syndromes and complex chromosomal aberrations<br />
Z. Zemanova 1 , J. Brezinova 2 , L. Babicka 1 , S. Izakova 2 , M. Siskova 3 , J. Cermak<br />
2 , K. Michalova 1,2 ;<br />
1 Center <strong>of</strong> Oncocytogenetics, General University Hospital and First Faculty <strong>of</strong><br />
Medicine, Charles University, Prague, Czech Republic, 2 Institute <strong>of</strong> Hematology<br />
and Blood Transfusion, Prague, Czech Republic, 3 1st Medical Department,<br />
General University Hospital and First Faculty <strong>of</strong> Medicine, Charles University,<br />
Prague, Czech Republic.<br />
Complex chromosomal aberrations (CCA) are detected in 10-20%<br />
patients with myelodysplastic syndromes (MDS), and are associated<br />
with drug resistance and poor outcome. Precise identifications <strong>of</strong> chromosomal<br />
regions involved in CCA could help in detection <strong>of</strong> cryptic,<br />
recurrent, prognostically significant aberrations and in identification <strong>of</strong><br />
candidate genes involved in leukemogenesis .<br />
During the last 6 years 590 patients with MDS were examined at diagnosis<br />
and in 69 <strong>of</strong> them CCA were ascertained . Chromosomal aberrations<br />
were verified by FISH with locus specific probes (Abbott-Vysis,<br />
Des Plaines, Illinois, USA), and by mFISH/mBAND with the “XCyte”<br />
probe kits (MetaSystems, Altlussheim, Germany) .<br />
The most frequently involved in complex rearrangements was chromosome<br />
5 (58x) followed by chromosomes 3 (27x), 17 (25x), 12 (23x), 11<br />
(20x) and 7 (20x) . Parts <strong>of</strong> deleted chromosome 5 were in many cases<br />
translocated into other chromosomes . The most recurrent partners <strong>of</strong><br />
chromosome 5 in translocation were chromosomes 17 (6x), 12 (6x), 3<br />
(3x) and 7 (3x) . Pure monosomy <strong>of</strong> chromosome 5 was proved in one<br />
case only thus showing that monosomy 5 in this cohort was not an<br />
isolated entity . The most frequent breakpoints were 5q31 (25x), 5q13 .3<br />
(24x), 5q12 (5x) and 5q14 (5x) . Presence <strong>of</strong> CCA at diagnosis was<br />
connected with poor response to therapy and short survival (mean 5<br />
months) .<br />
Finding <strong>of</strong> new chromosomal rearrangements and breakpoints might<br />
lead to discovery <strong>of</strong> genes, involved not only at the origin but also into<br />
pathways leading to progress <strong>of</strong> malignancy .<br />
Supported by NR/9227-3, NR/9481-3, MZO 000064165, MSM<br />
0021620808 and MSMT LC535.<br />
P04.107<br />
trisomy 9: A rare chromosomal abnormality in mDs<br />
D. Pathak 1 , R. Chaubey 2 , R. Kumar 1 , S. Sazawal 2 , R. Saxena 2 , R. Dada 1 ;<br />
1 Lab for Molecular Reproduction and <strong>Genetics</strong>, Deptt <strong>of</strong> Anatomy, All India<br />
Institute <strong>of</strong> Medical Sciences, New Delhi, India, 2 Deptt <strong>of</strong> Hematology, All India<br />
Institute <strong>of</strong> Medical Sciences, New Delhi, India.<br />
Myelodysplastic Syndrome (MDS) is a clonal disorder <strong>of</strong> haematopoietic<br />
stem cells and result in progressive cytopenia and defects in<br />
erythroid, myeloid and megakaryocytic maturation . Clonal chromosomal<br />
abnormalities have been reported in 30 to 60% cases <strong>of</strong> MDS .<br />
As a result conventional cytogenetics plays a prominent and well<br />
established role in determining the contemporary diagnosis, prognosis<br />
and grading <strong>of</strong> this disorder . The chromosomal abnormalities are<br />
predominantly characterized by partial/ total chromosomal loses or<br />
chromosomal gains . The chromosomal abnormalities include mainly<br />
-5/del (5q),-7/del (7q), del (11q), del (12p)/ (12q),-y and +8 . In an attempt<br />
to assess the frequency and type <strong>of</strong> cytogenetic abnormalities,<br />
cytogenetic analyses <strong>of</strong> 20 cases <strong>of</strong> MDS was done . Chromosomes