Molecular underpinnings of clinical disparity patterns in African American vs. Caucasian American multiple myeloma patients

Blood Cancer J. 2019 Feb 4;9(2):15. doi: 10.1038/s41408-019-0177-9.

Abstract

Caucasian Americans (CA) compared with African Americans (AA) have a twofold increased incidence of multiple myeloma (MM) and have an earlier age of diagnosis. However, there is sparse information regarding underlying biological differences across racial/ethnic groups. We characterized genetic alterations using a targeted next-generation sequencing assay called myTYPE, developed at MSKCC, allowing capture of somatic mutations, IgH translocations, gains/losses, and hyperdiploidy. Samples were obtained from the NIH Plasma Cell Dyscrasia Racial Disparity Cohort. In total, 68 patient samples were successfully sequenced and manually curated based on well-established databases. Of the 68 patient samples (47 CA, 21 AA), 84% had at least one type of genomic alteration. Importantly, the IgH translocation, t(11;14), was observed more frequently in the AA group (0 vs. 29%, p = 0.001). Known oncogenic somatic non-synonymous mutations were found in 18 genes and indels in 2 genes. KRAS mutations were the most common mutation found in 16% of patients followed by NRAS and BRAF mutations. TP53 somatic mutations appeared to be more common in CA but lacked significance. This proof-of-principle study indicates the presence of varying underlying tumor biology between racial groups and supports the need of future prospective trials to capture these molecular characteristics.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Biomarkers, Tumor
  • Black or African American / genetics*
  • DNA Copy Number Variations
  • Female
  • Gene Frequency
  • Genetic Heterogeneity*
  • Genetic Variation*
  • High-Throughput Nucleotide Sequencing
  • Humans
  • Multiple Myeloma / diagnosis
  • Multiple Myeloma / genetics*
  • Mutation
  • Translocation, Genetic
  • White People / genetics*

Substances

  • Biomarkers, Tumor