A1 Refereed original research article in a scientific journal
Primary mediastinal large B-cell lymphoma segregating in a family: exome sequencing identifies MLL as a candidate predisposition gene
Authors: Saarinen S, Kaasinen E, Karjalainen-Lindsberg ML, Vesanen K, Aavikko M, Katainen R, Taskinen M, Kytola S, Leppa S, Hietala M, Vahteristo P, Aaltonen LA
Publisher: AMER SOC HEMATOLOGY
Publication year: 2013
Journal: Blood
Journal name in source: BLOOD
Journal acronym: BLOOD
Number in series: 17
Volume: 121
Issue: 17
First page : 3428
Last page: 3430
Number of pages: 3
ISSN: 0006-4971
DOI: https://doi.org/10.1182/blood-2012-06-437210
Abstract
Primary mediastinal large B-cell lymphoma (PMBCL) is a subtype of diffuse large B-cell lymphoma (DLBCL) accounting for 2% to 4% of all non-Hodgkin lymphomas. We report a family of 3 siblings with PMBCL and their cousin with extranodal DLBCL. The histopathological characteristics of lymphomas of all 4 patients are similar, implying postgerminal center differentiation and growth deregulation by other mechanisms than BCL2-mediated inhibition of apoptosis and suggesting a shared biological background. We aimed to identify the genetic defect underlying lymphoma susceptibility in this family using exome sequencing and linkage analysis. The only variant segregating in all 4 patients and not reported in genetic databases was 5533C>A (His1845Asn) in the MLL gene. To our knowledge, this is the first time when familial clustering of PMBCL is reported. Although we propose MLL as a candidate predisposition gene for this condition, this finding needs to be validated in additional cases.
Primary mediastinal large B-cell lymphoma (PMBCL) is a subtype of diffuse large B-cell lymphoma (DLBCL) accounting for 2% to 4% of all non-Hodgkin lymphomas. We report a family of 3 siblings with PMBCL and their cousin with extranodal DLBCL. The histopathological characteristics of lymphomas of all 4 patients are similar, implying postgerminal center differentiation and growth deregulation by other mechanisms than BCL2-mediated inhibition of apoptosis and suggesting a shared biological background. We aimed to identify the genetic defect underlying lymphoma susceptibility in this family using exome sequencing and linkage analysis. The only variant segregating in all 4 patients and not reported in genetic databases was 5533C>A (His1845Asn) in the MLL gene. To our knowledge, this is the first time when familial clustering of PMBCL is reported. Although we propose MLL as a candidate predisposition gene for this condition, this finding needs to be validated in additional cases.
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