2017-06-01   Adriana Zamecnikova 

1.Kuwait Cancer Control Center, Department of Hematology, Laboratory of Cancer Genetics, Kuwait; annaadria@yahoo.com


Chromosome translocation between the short arm of chromosome 18 and the long arm of chromosome 21 including the t(18;21)(p11;q11) is a rare event, reported only in sporadic cases.

Clinics and Pathology


Acute erythroleukemia (FAB type M6), acute lymphoblastic leukemia (ALL) and follicular lymphoma


Only 3 cases to date: a 71-years old male diagnosed with acute erythroleukemia (Cigudosa et al., 2003), a female patient with follicular lymphoma (Lestou et al., 2003) and a 27-years old male with B-cell ALL (present case, personal observation).


Unknown (sporadic cases described). The ALL patient relapsed after 7 months of therapy and was alive in the last follow-up 2 years from the diagnosis.



Breakpoints on 18p and 21q are difficult to ascertain in suboptimal preparations.

Additional anomalies

Associated with del(5)(q13q31) del(5)(q13q31), monosomy 7, hsr and complex karyotype in the AML case (Cigadusa et al., 2003), del(5)(q15q31), +7, t(14;18)(q32;q21) in the lymphoma case (Lestou et al., 2003) and with homozygous 9p deletion (70% of cells), detected by fluorescence in situ hybridization in the present case.


Genes involved are unknown.


Pubmed IDLast YearTitleAuthors
126191652003De novo erythroleukemia chromosome features include multiple rearrangements, with special involvement of chromosomes 11 and 19.Cigudosa JC et al
129303842003Multicolour fluorescence in situ hybridization analysis of t(14;18)-positive follicular lymphoma and correlation with gene expression data and clinical outcome.Lestou VS et al


Atlas Image
Partial karyotypes with t(18;21)(p11;q11) (A). Fluorescence in situ hybridization with LSI TEL-AML1 probe (Vysis/Abott Molecular, US) probe showing relocation of AML1 (RUNX1) sequences from 21q22 to the short arm of chromosome 18 (B).


Adriana Zamecnikova


Atlas Genet Cytogenet Oncol Haematol. 2017-06-01

Online version: http://atlasgeneticsoncology.org/haematological/1791/t(18;21)(p11;q11)