Table 1.
Characteristics of MGUS patients among people with annual medical check-ups in Beijing, China.
| Characteristics | Patients, number/total number (%a) |
|---|---|
| Monoclonal isotype (sIFE) | 602b |
| IgG | 396 (65.8) |
| IgA | 135 (22.4) |
| IgM | 53 (8.8) |
| IgD | 2 (0.3) |
| Biclonal | 13 (2.2) |
| Light chain | 3 (0.5) |
| Type of light chain (sIFE) | 602b |
| κ | 305 (50.7) |
| λ | 293 (48.7) |
| κ+λ | 4 (0.7) |
| Free light-chain ratio | 440c |
| Normal (0.26–1.65) | 342 (77.7) |
| Abnormal | 98 (22.3) |
| M protein level and free light-chain ratio | 440c |
| M protein <15 g/L and free light-chain ratio normal | 340 (77.3) |
| M protein ≥15 g/L only | 2 (0.4) |
| Free light-chain ratio abnormal only | 90 (20.5) |
| Both abnormal | 8 (1.8) |
| M isotype, M protein level, and free light-chain ratio | 440c |
| IgG type, M protein <15 g/L, and free light-chain ratio normal | 251 (57.1) |
| Any 1 abnormal | 137 (31.1) |
| Any 2 abnormal | 51 (11.6) |
| Any 3 abnormal | 1 (0.2) |
| Reduced concentration of uninvolved immunoglobulins | 313d |
| 0 | 265 (84.7) |
| 1 | 39 (12.5) |
| 2 | 8 (2.5) |
| 3 | 1 (0.3) |
| Type of M protein (uIFE) | 165e |
| κ | 21 (12.7) |
| λ | 11 (6.7) |
| M protein | 4 (2.4) |
| κ+M protein | 1 (0.6) |
aThe percentage was calculated as the number of patients with MGUS divided by the number who were tested.
bPeople who had tested sIFE were studied.
cPeople who had tested free light ratio (FLC) were studied.
dPeople who had tested immunoglobulins were studied.
ePeople who had tested uIFE were studied. Among them, 37 people had positive results.