Supplemental Digital Content 1 Supplemental methods The Alzheimer’s Disease Neuroimaging Initiative (ADNI) was launched in 2003 by the National Institute on Aging (NIA), the National Institute of Biomedical Imaging and Bioengineering (NIBIB), the Food and Drug Administration (FDA), private pharmaceutical companies, and non-profit organizations as a $60 million, 5-year public-private partnership. The primary goal of the ADNI has been to explore whether serial magnetic resonance imaging (MRI), positron emission tomography (PET), other biological markers, and clinical and neuropsychological data can be combined to assess the progression of mild cognitive impairment (MCI) and early Alzheimer’s disease (AD) dementia. The purpose of accurate markers for AD at an early clinical stage is to stimulate the development of novel treatments, to monitor the effectiveness of these strategies, and to reduce the duration and cost of clinical trials. The Principal Investigator of this initiative is Michael W. Weiner, MD, VA Medical Center and University of California San Francisco. The goal of the recruitment process was to gather 800 adults aged 55 to 90 over 50 sites across the USA and Canada for participation in the research; follow-up examinations were scheduled for 200 cognitively normal older individuals over three years; for 400 people with MCI over three years; and for 200 people with early AD dementia over two years. Detailed information on the ADNI can be found in previous publications and at www.adniinfo.org. Supplemental table 1. 146 plasma biomarkers measured using the Luminex xMAP platform (Luminex Corp. Austin, TX, USA) by Rules-Based Medicine (RBM Inc. Austin, TX, USA). # Protein symbol Protein name (unit) 1 A1Micro Alpha-1-Microglobulin (µg/mL) 2 A2Macro Alpha-2-Macroglobulin (mg/mL) 3 AACT Alpha-1-Antichymotrypsin (µg/mL) 4 AAT Alpha-1-Antitrypsin (mg/mL) 5 ACE Angiotensin-Converting Enzyme (ng/mL) 6 Adiponectin Adiponectin (µg/mL) 7 AFP Alpha-Fetoprotein (ng/mL) 8 AGRP Agouti-Related Protein (pg/mL) 9 ANG2 Angiopoietin-2 (ng/mL) 10 Angiotensinogen Angiotensinogen (ng/mL) 11 ApoAI Apolipoprotein A-I (mg/mL) 12 ApoAII Apolipoprotein A-II (ng/ml) 13 ApoAIV Apolipoprotein A-IV (µg/ml) 14 ApoB Apolipoprotein B (µg/ml) 15 ApoCI Apolipoprotein C-I (ng/mL) 16 ApoCIII Apolipoprotein C-III (µg/mL) 17 ApoD Apolipoprotein D (µg/mL) 18 ApoE Apolipoprotein E (µg/mL) 19 ApoH Apolipoprotein H (µg/mL) 20 AXL AXL Receptor Tyrosine Kinase (ng/mL) 21 B2M Beta-2-Microglobulin (µg/mL) 22 BDNF Brain-Derived Neurotrophic Factor (ng/mL) 23 BLC B Lymphocyte Chemoattractant (pg/mL) 24 BMP6 Bone Morphogenetic Protein 6 (ng/mL) 25 BNP Brain Natriuretic Peptide (pg/mL) 26 BTC Betacellulin (pg/mL) 27 C3 Complement C3 (mg/mL) 28 CA199 Cancer Antigen 19-9 (U/mL) 29 Calcitonin Calcitonin (pg/mL) 30 CD40 CD 40 antigen (ng/mL) 31 CD40L CD40 Ligand (ng/mL) 32 CD5L CD5 Ligand (ng/mL) 33 CEA Carcinoembryonic Antigen (ng/mL) 34 CgA Chromogranin-A (ng/mL) 35 CKMB Creatine Kinase-MB (CK-MB) (ng/mL) 36 CLU Clusterin (ug/mL) 37 CNTF Ciliary Neurotrophic Factor (pg/mL) 38 CFH Complement Factor H (ug/mL) 39 Cortisol Cortisol (ng/mL) 40 Cpeptide C-peptide (ng/mL) 41 CRP C-Reactive Protein (ug/mL) 42 CystatinC Cystatin-C (ng/mL) 43 EGF Epidermal Growth Factor (pg/mL) 44 EGFR Epidermal Growth Factor Receptor (ng/mL) 45 EPGA Epithelial-Derived Neutrophil-Activating (ng/mL) 46 Eotaxin1 Eotaxin-1 (pg/mL) 47 Eotaxin-3 Eotaxin-3 (pg/mL) 48 ESelectin E-Selectin (ng/mL) 49 FABP Fatty Acid-Binding Protein-heart (ng/mL) 50 FactorVII Factor VII (ng/mL) 51 FAS FASLG Receptor (ng/mL) 52 FasL Fas Ligand (pg/mL) 53 FetuinA Fetuin-A (µg/mL) 54 FGF4 Fibroblast Growth Factor 4) (pg/mL) 55 Fibrinogen Fibrinogen (mg/mL) 56 FRTN Ferritin (ng/mL) 57 FSH Follicle-Stimulating Hormone (mIU/mL) 58 GH Growth Hormone (ng/mL) 59 GROalph Growth-Regulated alpha protein (pg/mL) 60 GSTalp Glutathione S-Transferase alpha (ng/mL) 61 Haptoglobin Haptoglobin (mg/mL) 62 HB Heparin-Binding EGF-Like Growth Factor (pg/mL) 63 HCC4 Chemokine CC-4 (ng/mL) 64 HGF Hepatocyte Growth Factor (ng/mL) 65 I3 T Lymphocyte-Secreted Protein I-309 (pg/mL) 66 ICAM Intercellular Adhesion Molecule 1 (ng/mL) 67 IgA Immunoglobulin A (mg/mL) 68 IgE Immunoglobulin E (ng/mL) 69 IGF-BP Insulin-like Growth Factor-Binding Protein (ng/mL) 70 IgM Immunoglobulin M (mg/mL) 71 IL-13 Interleukin-13 (pg/mL) 72 IL-16 Interleukin-16 (pg/mL) 73 IL-18 Interleukin-18 (pg/mL) 74 IL-3 Interleukin-3 (IL-3) (ng/mL) 75 IL-6r Interleukin-6 receptor (ng/mL) 76 IL-8 Interleukin-8 (pg/mL) 77 Insulin Insulin (µlU/mL) 78 IP-10 Interferon gamma Induced Protein 10 (pg/ml) 79 KIM1 Kidney Injury Molecule-1 (KIM-1) (ng/ml) 80 Leptin Leptin (ng/mL) 81 LH Luteinizing Hormone (mIU/mL) 82 Lpa Apolipoprotein(a) (ug/mL) 83 MCP1 Monocyte Chemotactic Protein 1 (pg/mL) 84 MCP2 Monocyte Chemotactic Protein 2 (pg/mL) 85 MCP3 Monocyte Chemotactic Protein 3 (pg/mL) 86 MCP4 Monocyte Chemotactic Protein 4 (pg/mL) 87 MCSF1 Macrophage Colony-Stimulating Factor 1 ( (ng/mL) 88 MDC Macrophage-Derived Chemokine (pg/mL) 89 MMIF Macrophage Migration Inhibitory Factor (ng/mL) 90 MI Monokine Induced by Gamma Interferon (pg/ml) 91 MIP1alpha Macrophage Inflammatory Protein-1 alpha (pg/mL) 92 MIP1beta Macrophage Inflammatory Protein-1 beta (pg/mL) 93 MIP3alpha Macrophage Inflammatory Protein-3 alpha (pg/ml) 94 MMP1 Matrix Metalloproteinase-1 (ng/ml) 95 MMP10 Matrix Metalloproteinase-10 (MMP-10) (ng/ml) 96 MMP2 Matrix Metalloproteinase-2 (ng/mL) 97 MMP7 Matrix Metalloproteinase-7 (ng/mL) 98 MMP9 Matrix Metalloproteinase-9 (ng/mL) 99 MMP9t Matrix Metalloproteinase-9-total (ng/ml) 100 MPIF Myeloid Progenitor Inhibitory Factor 1 (ng/mL) 101 MPO Myeloperoxidase (ng/mL) 102 Myoglobin Myoglobin (ng/mL) 103 NGAL Neutrophil Gelatinase-Associated Lipocal (ng/ml) 104 NrCAM Neuronal Cell Adhesion Molecule (ng/mL) 105 Osteopontin Osteopontin (ng/ml) 106 PAI1 Plasminogen Activator Inhibitor 1 (ng/mL) 107 PAP Prostatic Acid Phosphatase (PAP) (ng/mL) 108 PAPPAP Pregnancy-Associated Plasma Protein A (P (mIU/mL) 109 PARC Pulmonary and Activation-Regulated Chemo (ng/mL) 110 PDGF-BB Platelet-Derived Growth Factor BB (pg/mL) 111 PLGF Placenta Growth Factor (pg/mL) 112 PPP Pancreatic Polypeptide (pg/mL) 113 PRL Prolactin (ng/mL) 114 ProinsulinI Proinsulin-Intact (pM) 115 ProinsulinT Proinsulin-Total (pM) 116 PYY Peptide YY (pg/mL) 117 RAGE Receptor for advanced glycosylation end (ng/mL) 118 Tcee T-Cell-Specific Protein RANTES (ng/mL) 119 Resistin Resistin (ng/mL) 120 SAP Serum Amyloid P-Component (ug/mL) 121 SCF Stem Cell Factor (pg/mL) 122 SGOT Serum Glutamic Oxaloacetic Transaminase (ug/mL) 123 SHBG Sex Hormone-Binding Globulin (SHBG) (nmol/L) 124 SOD1 Superoxide Dismutase 1- Soluble (SOD-1) (ng/mL) 125 Sortilin Sortilin (ng/mL) 126 TBG Thyroxine-Binding Globulin (TBG) (ug/mL) 127 TECK Thymus-Expressed Chemokine (TECK) (ng/mL) 128 TestosteroneTotal Testosterone- Total (ng/mL) 129 TFF3 Trefoil Factor 3 (TFF3) (ug/ml) 130 THP Tamm-Horsfall Urinary Glycoprotein (THP) (ug/ml) 131 Thrombospondin1 Thrombospondin-1 (ng/mL) 132 TIM1 Tissue Inhibitor of Metalloproteinases 1 (ng/mL) 133 TM Thrombomodulin (TM) (ng/mL) 134 TNC Tenascin-C (TN-C) (ng/mL) 135 TNFalpha Tumor Necrosis Factor alpha (pg/mL) 136 TNFrL2 Tumor Necrosis Factor Receptor-Like 2 (T (ng/mL) 137 Thrombopoietin Thrombopoietin (ng/mL) 138 TNF TNF-Related Apoptosis-Inducing Ligand Re (ng/mL) 139 Serotransferrin Serotransferrin (mg/dl) 140 TSH Thyroid-Stimulating Hormone (µIU/mL) 141 TTR Transthyretin (mg/dL) 142 VCAM1 Vascular Cell Adhesion Molecule-1 (ng/mL) 143 VEGF Vascular Endothelial Growth Factor (pg/mL) 144 Vitronectin Vitronectin (µg/mL) 145 VKDPS Vitamin K-Dependent Protein S (µg/mL) 146 vWF von Willebrand Factor (µg/mL) Supplemental table 2. Network identified from IPA for a migration signature and plasma biomarker panel for Alzheimer’s disease Network # Gene symbol (name) in Ingenuity Network* Functions of the Network Score** AMBP (alpha-1-microglobulin) ApoE (apolipoprotein E) 1 NPPB (brain natriuretic peptide) Cellular Death Lipid Metabolism Molecular transport 17 IL16 (Interleukin-16) * Genes were part of a single functional genomic pathway identified by IPA. ** The score indicates the likelihood of the genes in a network from the Ingenuity knowledge base being found together due to random chance. A score > 3 is considered significant. Supplemental table 3. 79 plasma biomarkers published in 13 previous proteomic studies in Alzheimer’s disease Protein symbol Protein name References 1 AAT Alpha-1-Antitrypsin (Liao et al., 2007) 2 ACT Alpha-1-Antichymotrypsin (Engelhart et al., 2004) 3 Adiponectin Adiponectin (Britschgi et al., 2011) Serum albumin precursor (Hye et al., 2006) a 4 ALB 5 Apo E Apolipoprotein E (Akuffo et al., 2008) 6 Apo J a Apolipoprotein J (Liao et al., 2007) 7 ApoCIII Apolipoprotein C-III (Britschgi et al., 2011) 8 B2M Beta-2-Microglobulin (Britschgi et al., 2011) 9 C1-INH a Complement C1 Inhibitor (Akuffo et al., 2008) 10 C3 Complement Component 3 (Thambisetty et al., 2011) 11 C3a Complement C3a (Thambisetty et al., 2011) 12 C4 precursor Complement C4 precursor (Hye et al., 2006) 13 CCL2/MCP1 Monocyte Chemotactic Protein 1 (Britschgi et al., 2011) 14 CCL7/ MCP-3 Monocyte Chemotactic Protein 3 (Ray et al., 2007) 15 CD40 Ligand (Britschgi et al., 2011) CD5 Antigen-Like Precursor (Hye et al., 2006) 17 CD40L CD5 antigen-like precursor a CF-I a Complement Factor-I (Thambisetty et al., 2011) 18 CK-MB Creatine Kinase-MB (Britschgi et al., 2011) 19 Cortisol Cortisol (Laske et al., 2011) 20 CP a Ceruloplasmin Precursor (Hye et al., 2006) 21 CRP C-Reactive Protein (Engelhart et al., 2004) 22 DBP a Vitamin D-Binding Protein (Liao et al., 2007) 23 Desmoplakin a Desmoplakin (Hye et al., 2006) 24 Fibrinogen Fibrinogen (Thambisetty et al., 2011) Galectin-7 (Hye et al., 2006) 16 a a 25 Galectin-7 26 GH Growth Hormone (Britschgi et al., 2011) 27 Histone H2B.a/g/h/k/l a Histone H2B.a/g/h/k/l (Hye et al., 2006) 28 IgA Immunoglobulin A (Britschgi et al., 2011) 29 IGFBP-2 Insulin-Like Growth Factor-Binding Protein 2 (Rocha de Paula et al., 2011) 30 IGFBP-6 Insulin-Like Growth Factor-Binding Protein 6 (Ray et al., 2007) 31 IGHA1 a Ig alpha-1 chain C region (Hye et al., 2006) 32 IGHG1 a Ig gamma-1 chain C region (Hye et al., 2006) 33 IGKC a Ig kappa chain C region (Hye et al., 2006) 34 IGKV-I a Ig kappa chain V-I region Lay (Hye et al., 2006) 35 IGKV-II a Ig kappa chain V-II region (Hye et al., 2006) 36 IGKV-IV a Ig kappa chain V-IV region Len (Hye et al., 2006) 37 IGLC a Ig lambda chain C regions (Hye et al., 2006) 38 IGLV-II a Ig lambda chain V-II region TRO (Hye et al., 2006) 39 IGLV-III a Ig lambda chain V-III region LOI (Hye et al., 2006) Ig mu chain C region (Hye et al., 2006) a 40 IGMC 41 IL-12p70 a Interleukin-12p70 (Britschgi et al., 2011) 42 IL-18 Interleukin-18 (Britschgi et al., 2011) 43 IL-1a a Interleukin-1 alpha (Ray et al., 2007) 44 IL-1b a Interleukin-1 beta (Zuliani et al., 2008) 45 IL-4 a Interleukin-4 (Britschgi et al., 2011) 46 IL-6 a Interleukin-6 (Engelhart et al., 2004) 47 insulin Insulin (Britschgi et al., 2011) 48 NT-3 a Neurotrophin-3 (Rocha de Paula et al., 2011) 49 OLAB a Oxidized LDL Antibodies (Laske et al., 2011) 50 PAI1 Plasminogen Activator Inhibitor 1 (Britschgi et al., 2011) 51 PKA-C a Protein kinase A-C (Liao et al., 2007) 52 RAGE Receptor for Advanced Glycosylation End (Britschgi et al., 2011) 53 SAP Serum amyloid P-component Precursor (Hye et al., 2006) 54 TBG Thyroxine-Binding Globulin (Britschgi et al., 2011) 55 TF Tissue Factor (Britschgi et al., 2011) 56 TIMP1 Tissue Inhibitor of Metalloproteinases 1 (Britschgi et al., 2011) 57 TNF RII a Tumor Necrosis Factor receptor II (Britschgi et al., 2011) 58 TNFb a (Britschgi et al., 2011) 59 TRAIL-R4 a 60 VCAM-1 Tumor Necrosis Factor beta TNF-Related Apoptosis-Inducing Ligand Receptor 4 Vascular Cell Adhesion Molecule-1 61 VEGF-B Vascular Endothelial Growth Factor (Rocha de Paula et al., 2011) 62 vWF von Willebrand Factor (Laske et al., 2011) 63 A2M Alpha-2-Macroglobulin 64 ANG-2 Angiopoietin-2 (Akuffo et al., 2008; Hye et al., 2006; Thambisetty et al., 2008; Thambisetty et al., 2011) (Ray et al., 2007; Rocha de Paula et al., 2011; Soares et al., 2009) 65 CCL15/MIP-1d a Macrophage Inflammatory Protein-1 delta (Marksteiner et al., 2011; Ray et al., 2007; Rocha de Paula et al., 2011) 66 CCL18/PARC Pulmonary and Activation-Regulated Chemo (Ray et al., 2007; Soares et al., 2009) 67 CCL5/RANTES T-Cell-Specific Protein RANTES (Marksteiner et al., 2011; Ray et al., 2007; Soares et al., 2009) 68 CFH Complement Factor H (Akuffo et al., 2008; Hye et al., 2006; Thambisetty et al., 2008) 69 CXCL8/IL-8 Interleukin-8 (Ray et al., 2007; Soares et al., 2009) 70 EGF Epidermal Growth Factor (Ray et al., 2007; Soares et al., 2009) 71 G-CSF a Granulocyte Colony-Stimulating Factor 72 GDNF a Glial Cell Line–Derived Neurotrophic Factor 73 ICAM-1 74 IHRP a 75 IL-11 a Intercellular Adhesion Molecule 1 interalpha-trypsin inhibitor family heavy chain-related protein Interleukin-11 (Ray et al., 2007) (Zuliani et al., 2008) (Britschgi et al., 2011; Marksteiner et al., 2011; Ray et al., 2007; Rocha de Paula et al., 2011) (Marksteiner et al., 2011; Ray et al., 2007) (Ray et al., 2007; Soares et al., 2009) (Hye et al., 2006; Liao et al., 2007) (Ray et al., 2007; Rocha de Paula et al., 2011) 76 IL-3 Interleukin-3 (Britschgi et al., 2011; Ray et al., 2007; Soares et al., 2009) 77 M-CSF a Macrophage Colony-Stimulating Factor (Britschgi et al., 2011; Ray et al., 2007; Soares et al., 2009) 78 PDGF Platelet-Derived Growth Factor 79 TNFa Tumor Necrosis Factor alpha (Ray et al., 2007; Rocha de Paula et al., 2011; Soares et al., 2009) (Marksteiner et al., 2011; Ray et al., 2007; Soares et al., 2009; Zuliani et al., 2008) No. 1—62: biomarkers identified in a single proteomic study; No. 63—79: biomarkers identified in at least two independent proteomic studies. a biomarkers not tested in the ADNI plasma biomarker core. AD: Alzheimer’s disease; ADNI: Alzheimer's Disease Neuroimaging Initiative Supplemental figure 1. The Putative gene network derived from IPA software that shows a schematic flow diagram of a functional genomic pathway of 4 selected plasma biomarkers with amyloid precursor protein and tau IPA scans the set of input genes to identify networks by using Ingenuity Pathways Knowledge Base. Networks are displayed graphically as genes/gene products (“nodes”) with the biological relationships between the nodes (“edges”) identified. Edges are displayed with labels that describe the nature of the relationship between the nodes. The lines between genes represent known interactions, with solid lines representing direct interactions and with dashed lines representing indirect or hypothetical interactions. Color highlighting (red) indicates pathway-associated genes discovered by this study and non-highlighted genes are those identified by IPA.