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Table 4 Factor analysis on sTNFR1 and neuropeptides in serum

From: Levels of gastrin-releasing peptide and substance P in synovial fluid and serum correlate with levels of cytokines in rheumatoid arthritis

Variable Factor
  1 2 3
sTNFR1   0.323 0.827
BN/GRP 0.324 0.778  
SP 0.907   
VIP 0.934   
CGRP 0.63 0.575  
NPY 0.925   
ESR    0.897
  1. Principal-component analysis for sTNFR1 and five neuropeptides in serum from 21 patients with long-standing RA, and for the ESR. BN/GRP, bombesin/gastrin-releasing peptide; CGRP, calcitonin-gene-related peptide; ESR, erythrocyte sedimentation rate; NPY, neuropeptide Y; RA, rheumatoid arthritis; SP, substance P; sTNFR1, soluble tumour necrosis factor receptor 1; VIP, vasoactive intestinal peptide.