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Szarek M, Reijnders E, Steg PG, Jukema JW, Schwertfeger M, Bhatt DL, Bittner VA, Diaz R, Fazio S, Garon G, Goodman SG, Harrington RA, White HD, Zeiher AM, Cobbaert C, Schwartz GG. Comparison of Change in Lipoprotein(a) Mass and Molar Concentrations by Alirocumab and Risk of Subsequent Cardiovascular Events in ODYSSEY OUTCOMES. Eur J Prev Cardiol 2024:zwae110. [PMID: 38501249 DOI: 10.1093/eurjpc/zwae110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 02/19/2024] [Accepted: 03/13/2024] [Indexed: 03/20/2024]
Affiliation(s)
- Michael Szarek
- Division of Cardiology, University of Colorado School of Medicine, Aurora, CO, USA
- CPC Clinical Research, Aurora, CO, USA and State University of New York, Downstate Health Sciences University, Brooklyn, NY, USA
| | - Esther Reijnders
- Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Centre, Leiden, the Netherlands
| | - Ph Gabriel Steg
- Université Paris-Cité, INSERM-UMR1148, F-75018, Assistance Publique-Hôpitaux de Paris, Hôpital Bichat, FACT (French Alliance for Cardiovascular Trials), and Institut Universitaire de France, Paris, France
| | - J Wouter Jukema
- Department of Cardiology, Leiden University Medical Center, Leiden, the Netherlands and Netherlands Heart Institute, Utrecht, the Netherlands
| | | | - Deepak L Bhatt
- Mount Sinai Heart, Icahn School of Medicine at Mount Sinai Health System, New York, NY, USA
| | - Vera A Bittner
- Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Rafael Diaz
- Estudios Cardiológicos Latino América, Instituto Cardiovascular de Rosario, Rosario, Argentina
| | - Sergio Fazio
- Regeneron Pharmaceuticals Inc., Tarrytown, NY, USA
| | | | - Shaun G Goodman
- Canadian VIGOUR Centre, University of Alberta, Edmonton, Alberta, Canada and St. Michael's Hospital, University of Toronto, Toronto, Ontario, Canada
| | | | - Harvey D White
- Green Lane Cardiovascular Research Unit, Te Whatu Ora - Health New Zealand, Te Toka Tumai, and University of Auckland, Auckland, New Zealand
| | - Andreas M Zeiher
- Department of Medicine III, Goethe University, Frankfurt am Main, Germany
| | - Christa Cobbaert
- Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Centre, Leiden, the Netherlands
| | - Gregory G Schwartz
- Division of Cardiology, University of Colorado School of Medicine, Aurora, CO, USA
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Reijnders E, van der Laarse A, Ruhaak LR, Cobbaert CM. Closing the gaps in patient management of dyslipidemia: stepping into cardiovascular precision diagnostics with apolipoprotein profiling. Clin Proteomics 2024; 21:19. [PMID: 38429638 PMCID: PMC10908091 DOI: 10.1186/s12014-024-09465-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Accepted: 02/14/2024] [Indexed: 03/03/2024] Open
Abstract
In persons with dyslipidemia, a high residual risk of cardiovascular disease remains despite lipid lowering therapy. Current cardiovascular risk prediction mainly focuses on low-density lipoprotein cholesterol (LDL-c) levels, neglecting other contributing risk factors. Moreover, the efficacy of LDL-c lowering by statins resulting in reduced cardiovascular risk is only partially effective. Secondly, from a metrological viewpoint LDL-c falls short as a reliable measurand. Both direct and calculated LDL-c tests produce inaccurate test results at the low end under aggressive lipid lowering therapy. As LDL-c tests underperform both clinically and metrologically, there is an urging need for molecularly defined biomarkers. Over the years, apolipoproteins have emerged as promising biomarkers in the context of cardiovascular disease as they are the functional workhorses in lipid metabolism. Among these, apolipoprotein B (ApoB), present on all atherogenic lipoprotein particles, has demonstrated to clinically outperform LDL-c. Other apolipoproteins, such as Apo(a) - the characteristic apolipoprotein of the emerging risk factor lipoprotein(a) -, and ApoC-III - an inhibitor of triglyceride-rich lipoprotein clearance -, have attracted attention as well. To support personalized medicine, we need to move to molecularly defined risk markers, like the apolipoproteins. Molecularly defined diagnosis and molecularly targeted therapy require molecularly measured biomarkers. This review provides a summary of the scientific validity and (patho)physiological role of nine serum apolipoproteins, Apo(a), ApoB, ApoC-I, ApoC-II, ApoC-III, ApoE and its phenotypes, ApoA-I, ApoA-II, and ApoA-IV, in lipid metabolism, their association with cardiovascular disease, and their potential as cardiovascular risk markers when measured in a multiplex apolipoprotein panel.
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Affiliation(s)
- Esther Reijnders
- Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Center, Leiden, the Netherlands.
| | - Arnoud van der Laarse
- Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Center, Leiden, the Netherlands
| | - L Renee Ruhaak
- Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Center, Leiden, the Netherlands
| | - Christa M Cobbaert
- Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Center, Leiden, the Netherlands
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Szarek M, Reijnders E, Jukema JW, Bhatt DL, Bittner VA, Diaz R, Fazio S, Garon G, Goodman SG, Harrington RA, Ruhaak LR, Schwertfeger M, Tsimikas S, White HD, Steg PG, Cobbaert C, Schwartz GG. Relating Lipoprotein(a) Concentrations to Cardiovascular Event Risk After Acute Coronary Syndrome: A Comparison of 3 Tests. Circulation 2024; 149:192-203. [PMID: 37632469 PMCID: PMC10782942 DOI: 10.1161/circulationaha.123.066398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Accepted: 08/23/2023] [Indexed: 08/28/2023]
Abstract
BACKGROUND Lipoprotein(a) is a risk factor for cardiovascular events and modifies the benefit of PCSK9 (proprotein convertase subtilisin/kexin type 9) inhibitors. Lipoprotein(a) concentration can be measured with immunoassays reporting mass or molar concentration or a reference measurement system using mass spectrometry. Whether the relationships between lipoprotein(a) concentrations and cardiovascular events in a high-risk cohort differ across lipoprotein(a) methods is unknown. We compared the prognostic and predictive value of these types of lipoprotein(a) tests for major adverse cardiovascular events (MACE). METHODS The ODYSSEY OUTCOMES trial (Evaluation of Cardiovascular Outcomes After an Acute Coronary Syndrome During Treatment With Alirocumab) compared the PCSK9 inhibitor alirocumab with placebo in patients with recent acute coronary syndrome. We compared risk of a MACE in the placebo group and MACE risk reduction with alirocumab according to baseline lipoprotein(a) concentration measured by Siemens N-latex nephelometric immunoassay (IA-mass; mg/dL), Roche Tina-Quant turbidimetric immunoassay (IA-molar; nmol/L), and a noncommercial mass spectrometry-based test (MS; nmol/L). Lipoprotein(a) values were transformed into percentiles for comparative modeling. Natural cubic splines estimated continuous relationships between baseline lipoprotein(a) and outcomes in each treatment group. Event rates were also determined across baseline lipoprotein(a) quartiles defined by each assay. RESULTS Among 11 970 trial participants with results from all 3 tests, baseline median (Q1, Q3) lipoprotein(a) concentrations were 21.8 (6.9, 60.0) mg/dL, 45.0 (13.2, 153.8) nmol/L, and 42.2 (14.3, 143.1) nmol/L for IA-mass, IA-molar, and MS, respectively. The strongest correlation was between IA-molar and MS (r=0.990), with nominally weaker correlations between IA-mass and MS (r=0.967) and IA-mass and IA-molar (r=0.972). Relationships of lipoprotein(a) with MACE risk in the placebo group were nearly identical with each test, with estimated cumulative incidences differing by ≤0.4% across lipoprotein(a) percentiles, and all were incrementally prognostic after accounting for low-density lipoprotein cholesterol levels (all spline P≤0.0003). Predicted alirocumab treatment effects were also nearly identical for each of the 3 tests, with estimated treatment hazard ratios differing by ≤0.07 between tests across percentiles and nominally less relative risk reduction by alirocumab at lower percentiles for all 3 tests. Absolute risk reduction with alirocumab increased with increasing lipoprotein(a) measured by each test, with significant linear trends across quartiles. CONCLUSIONS In patients with recent acute coronary syndrome, 3 lipoprotein(a) tests were similarly prognostic for MACE in the placebo group and predictive of MACE reductions with alirocumab at the cohort level. REGISTRATION URL: https://www.clinicaltrials.gov; Unique identifier: NCT01663402.
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Affiliation(s)
- Michael Szarek
- Division of Cardiology, University of Colorado School of Medicine, Aurora (M. Szarek, G.G.S.)
- CPC Clinical Research, Aurora, CO (M. Szarek)
- State University of New York, Downstate Health Sciences University, Brooklyn (M. Szarek)
| | - Esther Reijnders
- Departments of Clinical Chemistry and Laboratory Medicine (E.R., L.R.R., C.C.), Leiden University Medical Center, the Netherlands
| | - J. Wouter Jukema
- Cardiology (J.W.J.), Leiden University Medical Center, the Netherlands
- Netherlands Heart Institute, Utrecht (J.W.J.)
| | - Deepak L. Bhatt
- Mount Sinai Heart, Icahn School of Medicine at Mount Sinai Health System, New York, NY (D.L.B.)
| | - Vera A. Bittner
- Division of Cardiovascular Disease, University of Alabama at Birmingham (V.A.B.)
| | - Rafael Diaz
- Estudios Cardiológicos Latino América, Instituto Cardiovascular de Rosario, Argentina (R.D.)
| | - Sergio Fazio
- Regeneron Pharmaceuticals Inc, Tarrytown, NY (S.F.)
| | | | - Shaun G. Goodman
- Canadian VIGOUR Centre, University of Alberta, Edmonton, Canada (S.G.G.)
- St Michael’s Hospital, University of Toronto, Ontario, Canada (S.G.G.)
| | - Robert A. Harrington
- Stanford Center for Clinical Research, Department of Medicine, Stanford University, CA (R.A.H.)
| | - L. Renee Ruhaak
- Departments of Clinical Chemistry and Laboratory Medicine (E.R., L.R.R., C.C.), Leiden University Medical Center, the Netherlands
| | | | - Sotirios Tsimikas
- Sulpizio Cardiovascular Center, Division of Cardiovascular Medicine, University of California San Diego, La Jolla (S.T.)
| | - Harvey D. White
- Green Lane Cardiovascular Research Unit, Te Whatu Ora–Health New Zealand, Te Toka Tumai, and University of Auckland, New Zealand (H.D.W.)
| | - P. Gabriel Steg
- Université Paris-Cité, INSERM-UMR1148, Assistance Publique-Hôpitaux de Paris, Hôpital Bichat, FACT (French Alliance for Cardiovascular Trials), and Institut Universitaire de France, Paris (P.G.S.)
| | - Christa Cobbaert
- Departments of Clinical Chemistry and Laboratory Medicine (E.R., L.R.R., C.C.), Leiden University Medical Center, the Netherlands
| | - Gregory G. Schwartz
- Division of Cardiology, University of Colorado School of Medicine, Aurora (M. Szarek, G.G.S.)
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Reijnders E, van der Laarse A, Jukema JW, Cobbaert CM. High residual cardiovascular risk after lipid-lowering: prime time for Predictive, Preventive, Personalized, Participatory, and Psycho-cognitive medicine. Front Cardiovasc Med 2023; 10:1264319. [PMID: 37908502 PMCID: PMC10613690 DOI: 10.3389/fcvm.2023.1264319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Accepted: 10/03/2023] [Indexed: 11/02/2023] Open
Abstract
As time has come to translate trial results into individualized medical diagnosis and therapy, we analyzed how to minimize residual risk of cardiovascular disease (CVD) by reviewing papers on "residual cardiovascular disease risk". During this review process we found 989 papers that started off with residual CVD risk after initiating statin therapy, continued with papers on residual CVD risk after initiating therapy to increase high-density lipoprotein-cholesterol (HDL-C), followed by papers on residual CVD risk after initiating therapy to decrease triglyceride (TG) levels. Later on, papers dealing with elevated levels of lipoprotein remnants and lipoprotein(a) [Lp(a)] reported new risk factors of residual CVD risk. And as new risk factors are being discovered and new therapies are being tested, residual CVD risk will be reduced further. As we move from CVD risk reduction to improvement of patient management, a paradigm shift from a reductionistic approach towards a holistic approach is required. To that purpose, a personalized treatment dependent on the individual's CVD risk factors including lipid profile abnormalities should be configured, along the line of P5 medicine for each individual patient, i.e., with Predictive, Preventive, Personalized, Participatory, and Psycho-cognitive approaches.
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Affiliation(s)
- E. Reijnders
- Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Center, Leiden, Netherlands
| | - A. van der Laarse
- Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Center, Leiden, Netherlands
| | - J. W. Jukema
- Department of Cardiology, Leiden University Medical Center, Leiden, Netherlands
- Netherlands Heart Institute, Utrecht, Netherlands
| | - C. M. Cobbaert
- Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Center, Leiden, Netherlands
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Smit NPM, Romijn FPHTM, van Ham VJJ, Reijnders E, Cobbaert CM, Ruhaak LR. Quantitative protein mass-spectrometry requires a standardized pre-analytical phase. Clin Chem Lab Med 2023; 61:55-66. [PMID: 36069790 DOI: 10.1515/cclm-2022-0735] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 08/21/2022] [Indexed: 12/15/2022]
Abstract
OBJECTIVES Quantitative protein mass-spectrometry (QPMS) in blood depends on tryptic digestion of proteins and subsequent measurement of representing peptides. Whether serum and plasma can be used interchangeably and whether in-vitro anticoagulants affect the recovery is unknown. In our laboratory serum samples are the preferred matrix for QPMS measurement of multiple apolipoproteins. In this study, we investigated the effect of different matrices on apolipoprotein quantification by mass spectrometry. METHODS Blood samples were collected from 44 healthy donors in Beckton Dickinson blood tubes simultaneously for serum (with/without gel) and plasma (heparin, citrate or EDTA). Nine apolipoproteins were quantified according to standard operating procedure using value-assigned native serum calibrators for quantitation. Tryptic digestion kinetics were investigated in the different matrices by following formation of peptides for each apolipoprotein in time, up to 22 h. RESULTS In citrate plasma recovery of apolipoproteins showed an overall reduction with a bias of -14.6%. For heparin plasma only -0.3% bias was found compared to serum, whereas for EDTA-plasma reduction was more pronounced (-5.3% bias) and variable with >14% reduction for peptides of apoA-I, A-II and C-III. Digestion kinetics revealed that especially slow forming peptides showed reduced formation in EDTA-plasma. CONCLUSIONS Plasma anticoagulants affect QPMS test results. Heparin plasma showed comparable results to serum. Reduced concentrations in citrate plasma can be explained by dilution, whereas reduced recovery in EDTA-plasma is dependent on altered proteolytic digestion efficiency. The results highlight the importance of a standardized pre-analytical phase for accurate QPMS applications in clinical chemistry.
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Affiliation(s)
- Nico P M Smit
- Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Fred P H T M Romijn
- Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | | | - Esther Reijnders
- Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Christa M Cobbaert
- Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - L Renee Ruhaak
- Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Center, Leiden, The Netherlands
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