Table 3.
MGUS characteristics by race
| Variable | Blacks (n = 1000) | Whites (n = 996) |
|---|---|---|
| Total n (%) | 39 (100) | 21 (100) |
| M-protein concentration,* g/dL, | 0.82 (0.39-1.14) | 0.55 (0.38-1.04) |
| median (range) | ||
| M-protein isotype,† n (%) | ||
| IgG | 31 (79.5) | 15 (71.4) |
| IgA | 3 (7.7) | 0 |
| IgM | 3 (7.7) | 4 (19.1) |
| Biclonal | 2 (5.1) | 1 (4.8) |
| Triclonal | 0 | 1 (4.8) |
| Serum light-chain type,† n (%) | ||
| κ | 21 (53.8) | 10 (47.6) |
| λ | 17 (43.6) | 9 (42.8) |
| Biclonal | 1 (2.6) | 1 (4.8) |
| Triclonal | 0 | 1 (4.8) |
| M-protein concentration,† g/dL, n (%) | ||
| Immeasurable | 29 (74.4) | 16 (76.2) |
| Less than 0.49 | 1 (2.6) | 2 (9.5) |
| 0.50-0.99 | 7 (17.9) | 2 (9.5) |
| More than or equal to 1.00 | 2 (5.1) | 1 (4.8) |
| Age group,† y, n (%) | ||
| Less than 50 | 14 (35.9) | 7 (33.3) |
| More than or equal to 50 | 25 (64.1) | 14 (66.7) |
*
Excluding cases with immeasurable M-protein concentration.
†
None of the racial differences was significant (χ2 test).