Table 1. Characteristics of study population.

	Disease (n = 12)*	Controls (n = 18)
Males	8	10
Females	4	8
Mean age at enrollment (years ± S.D.)**	53.8 ± 6.9	46.5 ± 13.8***
Caucasian	12	16&
Classic acute SCLS	11	NA
Chronic SCLS	1	NA
MGUS	10 (83%)	NA

^*Diagnosis of SCLS made according to established criteria: at least one episode of hypotension, hemoconcentration (elevated Hgb/Hct), and hypoalbuminemia or chronic edema and hypoalbuminemia; **P = 0. 07, Mann-Whitney test;***does not include reference sample; ^&includes 1 Hispanic, 1 African-American.