Correlations between protein expression (normalized and log transformed), symptoms, and gastric emptying in diabetic gastroparesis. A: properdin (CFP) abundance negatively correlated with gastroparesis cardinal symptom index (GCSI) bloating. No correlations were seen between other subscores (nausea, fullness) or overall GCSI. B–D: negative correlation between 4 h of gastric retention and expressions of prostaglandin G/H synthase 2 (PTGS2), complement 2 (C2), and protein kinase Cζ (PRKCZ). No correlations were seen between protein abundance, symptoms, and gastric retention in idiopathic gastroparesis. A complete list of all protein expressions in patients with diabetic and idiopathic gastroparesis is available in GEO database (GSE130672; https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE130672; Token: grwpcgikvfmvzgl). AU, arbitrary units. FDR, false discovery rate.