Which groups are most frequently affected by multiple myeloma?

Blacks in US. Twice the incidence in african americans than caucasians. Some families have a higher incidence.
Family, blacks. Old report (2003): myeloma and race: a review of the literature. Benjamin m, reddy s, brawley ow. http://www.ncbi.nlm.nih.gov/pubmed/12716040 "... Increased myeloma morbidity and mortality in blacks..." see also: familial monoclonal gammopathy of undetermined significance, multiple myeloma, and other cancers (k. Anderson) http://www.Hematology.Org/publications/hematologist/2009/4422.Aspx.