IgM monoclonal gammopathy of undetermined significance and smoldering Waldenström's macroglobulinemia.
Immunoglobulin M monoclonal gammopathy of undetermined significance (IgM-MUS) was diagnosed in 213 Mayo Clinic patients who were residents of 11 counties in southeastern Minnesota from 1960 to 1994. During long-term follow-up, 29 (14%) developed non-Hodgkin lymphoma (n = 17), Waldenström's macroglobulinemia (WM; n = 6), chronic lymphocytic leukemia (n = 3), and AL amyloidosis (n = 3) with relative risks of 15-, 262-, 6-, and 16-fold, respectively. The cumulative probability of progression to one of these disorders was 10% at 5 years, 18% at 10 years, and 24% at 15 years, approximately 1.5% per year. Smoldering WM was identified in 48 patients at Mayo Clinic from 1974 to 1995. During follow-up, 33 of the 48 patients progressed to symptomatic WM. The median time to progression was 4.6 years. The risk of progression to WM was 6% at 1 year, 39% at 3 years, and 55% at 5 years.
Division of Hematology, Mayo Clinic, Rochester, MN 55905, USA. kyle.robert@mayo.edu
Robert A
RA
Kyle
Joanne
J
Benson
Dirk
D
Larson
Terry
T
Therneau
Angela
A
Dispenzieri
L Joseph
LJ
Melton Iii
S Vincent
SV
Rajkumar
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D018450:Disease Progression; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007075:Immunoglobulin M / Q000097:blood*; D008297:Male; D008875:Middle Aged; D008910:Minnesota / Q000453:epidemiology; D015999:Multivariate Analysis; D010265:Paraproteinemias / Q000097:blood / Q000453:epidemiology* / Q000473:pathology; D008258:Waldenstrom Macroglobulinemia / Q000453:epidemiology* / Q000473:pathology; D055815:Young Adult
D007075:Immunoglobulin M