Table 1.

Patient characteristics

Characteristic	Value
No. of patients	29
Median age, years (range)	63 (41–88)
Sex, no. (%)
Male	14 (48%)
Female	15 (52%)
Race/ethnicity, no. (%)
White	27 (93%)
Nonwhite	2 (7%)
Underlying disease, no. (%)
Multiple myeloma	17 (59%)
Waldenstrom's macroglobulinemia	11 (38%)
Solitary plasmacytoma	1 (3%)
Immunoglobulin type
IgG	11
IgM	10
IgA	1
Light chain	5
Nonsecretory	2
Immunoglobulin levels, mg/dl; median (range)
Overall
IgG (n = 29)	896 (109–4,050)
IgM (n = 29)	45 (2–5,080)
Multiple myeloma (n = 17)
IgG	1990 (896–4,050)
IgG > 2,000 mg/dl (n = 4)	2,840 (2,560–4,050)
Waldenstrom's macroglobulinemia (n = 12)
IgM	1,700 (57–5,080)