Table 1. Baseline characteristics.

	Patients, N=122
Median age, years (range)	69 (35–92)
Female sex, N (%)	61 (50%)
Serum monoclonal protein spike, median (range) (g/dl)	2.0 (0.0–4.6)
Urine monoclonal protein spike (n=96), N (%)
Not present	29 (30)
Detected on immunofixation only	39 (41)
Measurable but <0.5 g per 24 h	24 (25)
0.5 g per 24 h or more	3 (3)
Bone marrow plasma cell percentage, median (range)	20 (4.0–100)
Serum-free light-chain assay (n=91), N (%)
Abnormal κ/λ FLC ratio (<0.26 or >1.65)	12 (13)
Abnormal involved/uninvolved FLC ratio ⩾8	57 (63)
Abnormal involved/uninvolved FLC ratio ⩾100	13 (14)

Abbreviation: FLC, free light chain.