title: Familial predisposition and genetic risk factors for lymphoma.
abstract: Our understanding of familial predisposition to lymphoma (collectively defined as non-Hodgkin lymphoma [NHL], Hodgkin lymphoma [HL], and chronic lymphocytic leukemia [CLL]) outside of rare hereditary syndromes has progressed rapidly during the last decade. First-degree relatives of NHL, HL, and CLL patients have an ∼1.7-fold, 3.1-fold, and 8.5-fold elevated risk of developing NHL, HL, and CLL, respectively. These familial risks are elevated for multiple lymphoma subtypes and do not appear to be confounded by nongenetic risk factors, suggesting at least some shared genetic etiology across the lymphoma subtypes. However, a family history of a specific subtype is most strongly associated with risk for that subtype, supporting subtype-specific genetic factors. Although candidate gene studies have had limited success in identifying susceptibility loci, genome-wide association studies (GWAS) have successfully identified 67 single nucleotide polymorphisms from 41 loci, predominately associated with specific subtypes. In general, these GWAS-discovered loci are common (minor allele frequency >5%), have small effect sizes (odds ratios, 0.60-2.0), and are of largely unknown function. The relatively low incidence of lymphoma, modest familial risk, and the lack of a screening test and associated intervention, all argue against active clinical surveillance for lymphoma in affected families at this time.
authors.affiliation: Division of Epidemiology, Department of Health Sciences Research, Genetic Epidemiology and Risk Assessment Program, Mayo Clinic Comprehensive Cancer Center, and.
authors.forename: James R
authors.identifier: http://orcid.org/0000-0002-7482-178X
authors.initials: JR
authors.lastname: Cerhan
authors.affiliation: Genetic Epidemiology and Risk Assessment Program, Mayo Clinic Comprehensive Cancer Center, and Division of Biomedical Statistics and Informatics, Department of Health Sciences Research, Mayo Clinic, Rochester, MN.
authors.forename: Susan L
authors.identifier: http://orcid.org/0000-0002-5173-4712
authors.initials: SL
authors.lastname: Slager
mesh_terms: D000483:Alleles; D000818:Animals; D005190:Family; D005787:Gene Frequency; D056426:Genetic Loci; D020022:Genetic Predisposition to Disease; D055106:Genome-Wide Association Study; D006801:Humans; D008223:Lymphoma / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide