Table 1.

Characterization of MGUS patients at the time of first Hevylite determination.

MGUS isotypeAll
IgGIgAIgM
N, (% of All)164 (66)44 (18)40 (16)248
Light chain
    Kappa, %615467.561
    Lambda, %394632.539
Gender
    Male, %47435948
    Female, %53574152
Age, years
    Median (range)74 (29–100)71 (39–92)73 (42–93)73 (29–100)
M-protein
    Median (range), g/dL0.7 (0.1–3)0.4 (0.2–2.2)0.6 (0.2–2.4)0.6 (0.1–3)
Free light chain ratio
    Normal (0.26–1.65)45%32%45%43%
Hevylite ratio
    Abnormal87%100%92%90%
Risk group (IMWG)
    Low, %430028
    Low-intermediate, %43294241
    Intermediate-high, %14645229
    High, %0762