CD14 and rheumatoid arthritis: Consistent with previous reports (42, 43), RA patient plasma (mean ± S.D.: 245.7 ± 48.3 ng/ml, n = 32) had a significantly higher amount of sCD62P than did that of HCs (126.4 ± 48.3 ng/ml, n = 18) (p < 0.0001), suggesting that the presence of activated platelets is related to the expansion of CD14+CD16+ monocytes in RA patients.