ABSTRACT
Thirteen patients with B-non Hodgkin's lymphoma and abnormalities of the short arm of chromosome 1 were evaluated, to see if this cytogenetic anomaly was associated with a particular subgroup of lymphomas. Large cell lymphoma was found in seven patients (with an immunoblastic component in four cases). Six patients with diffuse small cleaved cell lymphoma of non follicle centre cell origin formed a second group. The chromosome 1 breakpoints in the second group were located between p34 and p36, suggesting that genes located here may be important in the initiation or progression of these lymphomas.
ABSTRACT
We report three cases of small B cell non Hodgkins lymphoma, two with plasmacytoid differentiation, presenting with a similar clinical picture and identical immunophenotype, who cytogenetically had breakpoints involving band 11q25. We suggest that this breakpoint may define a group of lymphomas closely related to the diffuse small cleaved cell lymphomas with t(11;14)(q13;q32).
ABSTRACT
The t(2;18)(p11;q21) has recently been described in two lymphoma cases as a variant of the t(14;18)(q32;q21) typical chromosome translocation in follicular lymphomas. Molecular investigations of t(2;18) confirmed juxtaposition of the bcl-2 gene to the immunoglobulin kappa (Igk) locus and described a new break point region on 18q21 found also in the recently reported, second follicular variant translocation (18;22)(q21;q11). Thus, cytogenetic and molecular studies established the same mechanism of (onco)gene activation by the heavy or light Ig gene in follicular lymphomas and Burkitt lymphomas. We describe a case of small non cleaved non Hodgkin's lymphoma in which translocation (2;18) coexisted with a typical (8;14) Burkitt translocation. Absent HLA-DR expression by the tumour cells was noted in this case. The possible implications of the cytogenetic and immunologic findings are discussed.
