1 / 17

ADNI Biomarker Core

ADNI Biomarker Core. Leslie M Shaw John Q Trojanowski ICAD, Honolulu July 10, 2010. ADNI Biomarker Core. Established and maintained ADNI Biofluid Bank at UPenn , 24/7

corine
Download Presentation

ADNI Biomarker Core

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ADNI Biomarker Core Leslie M Shaw John Q Trojanowski ICAD, Honolulu July 10, 2010

  2. ADNI Biomarker Core • Established and maintained ADNI Biofluid Bank at UPenn, 24/7 • Established reproducible CSF Ab42, t-tau, ptau181 immunoassays using LuminexxMAP/Innogenetics system; interlab study involved 7 ISAB and academic laboratories • Developed AD – like biomarker signature/cutpointsusing CSFs from ADNI-independent autopsy-based AD cases & age-matched controls and determined incidence in ADNI cohorts (Ann Neurol, 2009) • Detected abnormal Ab42 CSF concentration in 34% of cognitively normal subjects • Assessments of longitudinal changes underway, an ADNI extension study • Determined predictive performance of individual and combined CSF biomarkers for MCI → AD progression • Further validation of the AD biomarker signature: • DeMeyer et al diagnosis-independent “mixture modeling” approach (Arch Neurol, 2010) • Significantly > 1 yr rate of hippocampal atrophy and LV volume  in subjects with baseline Ab42 below cutpoint • Okonkwo et al characterized the relationship between CSF biomarker abnormalities and rate of decline in everyday function across the AD spectrum (Arch Neurol, 2010) • Continue collaborative studies of data integration including imaging and biochemical biomarkers and neuropsychological tests (eg, Vemuri et al, Neurol, 2009; Landau et al, Neurol, 2010; Davitskos et al, NBoA, 2010; Nettiksimmons et al, NBoA, 2010) • Developed and qualified an HPLC/MS-MS method for isoprostanes in CSF, BASELINE CSF data uploaded on ADNI website; completed plasma homocysteine data through year 2; CSF HCy BASELINE measured at Merck, uploaded • Working closely with Kai Blennow on the International CSF QC program (sponsored by Alz Assn) to further promote the standardization of pre-analytical and analytical steps involved in CSF biomarker measurements. • Plasma biomarker initiatives: • Plasma Ab42/40 interlabstudy, using Luminex/Innogenetics reagents, data analyses: involving 12 ISAB & academic labs, completed and posted on ADNI web site; ADNI longitudinal sample analyses initiated during 2010 • ISAB-sponsored studies of qualified RBM panels underway for 1066 ADNI BL & yr1 plasma in 2010

  3. CSF sample collection for ADNI: • After overnight fast • Collect into polypropylene tube • Transfer to polypropylene transfer tube • No centrifugation • Freeze at site, thaw & aliquot at UPenn, storage at -80 0C Number of biofluids collected as of 6/30/2010 13,122 Number of aliquots in biofluid bank 126,681

  4. ADNI CSF Biochemical Biomarker InterlaboratoryStudy (All Data Are on ADNI Website)

  5. Reproducibility of xMAP Immunoassay (Innogenetics reagents/Luminex) in the ADNI biomarker core lab Avg test/re-test %CV: Ab42, 5.7% t-tau, 5.6% p-tau181, 11.5%

  6. CSF Biomarker Cutpoints Established Using CSFs Collected from ADNI-Independent Autopsy-Based AD and Age-Matched Cognitively Normal Subjects

  7. UPenn Autopsy-Based CSF Biomarker AD Signature in the ADNI Study Cohorts LRTAA = a logistic regression model that includes Tau, Ab42, and ApoE e4 allele number; ROC = receiver operating characteristic curve

  8. Survival analyses for ADNI MCI subjects: progression to AD for BASELINE CSF biomarkers > or < cutpoints Ab42<192 pg/mL t-tau/Ab42>0.39 As of June 28, 2010 riskTAA2>0.34

  9. Autopsy-based CSF biomarker AD signature in ADNI MCI→AD progressors Frequency distribution plots for Ab1-42 ADNI data as of 6/30/2010

  10. Further validation of the AD biomarker signature • DeMeyer, et al, diagnosis-independent analysis of ADNI CSF biomarker data: correctly classified as AD 94% of autopsy-proven cases of AD in pre-mortem CSF (Arch Neurol, 67:1-8, 2010): • 91% of ADNI AD subjects had the AD CSF signature • Confirmed the AD signature more than 1/3rd of the elderly cognitively normal control • We showed that there was a significantly greater rate of hippocampal atrophy and lateral ventricular volume expansion in subjects with baseline Ab42 below the cutpoint • Okonkwo, et al, showed that CSF abnormalities are associated with functional decline (FAQ) in NC and MCI subjects but do not predict functional decline in AD. Persons with t-tau and Ab42 abnormalities are at greatest risk of functional impairment (Arch Neurol 67:688-696, 2010).

  11. Temporal Ordering of Biomarkers of AD Reflects Disease Progression Predictive performance of biomarkers is time dependent with Ab42 the earliest index of disease pathology and tau a later index. This time course of biomarker pathology provides a useful framework for interpretation of biochemical and imaging biomarker data. Shaw, et al., 2007; Jack, et al., 2010; Trojanowski, et al, 2010

  12. Plasma Ab42/40 interlaboratory qualification study Poster presentation at ICAD 2010

  13. ADNI 2 Biomarker Core Update on the Recently Completed Interlab Study of Plasma Aß Measures in Non-ADNI  Pooled Plasma Samples Statistical analyses of the 12 center interlaboratory "round-robin" study report for the INNO-BIA plasma Aß forms immunoassay(Innogenetics, Belgium) showed: • Total reproducibility across these 12 centers (combined within-center and between-center %CV) was less than 16.7% for Aß42 and Aß40 and within individual centers the overall reproducibility is even better.   • The ADNI Biomarker Core laboratory which is funded by ADNI 1 and GO to measure plasma Aß42 and Aß40, achieved total analytical error (combined within- and between-day %CVs) ranging from 0.9 to  4.9% for plasma Aß42, 1.2 to 6.6% for Aß40 and up to 7.6% for the ratio of Aß42/Aß40.   • Thus the ADNI Biomarker core has initiated measurement of plasma Aß42 and Aß40 concentrations in longitudinal samples of ADNI subjects, using this analytically qualified methodology, to determine the changes in these biomarkers over time and determine their value as indices of progression from MCI to AD. • 110 INNO-BIA plasma Aß forms immunoassay kits have already been provided as an in-kind contribution to ADNI study by INNOGENETICS. • This will help to significantly resolve controversies surrounding the significance of measuring plasma Aß as an MCI/AD biomarker.

  14. ADNI GO and ADNI 2 • Receive, bank and monitor 24/7 CSF, plasma and serum samples from ADNI GO and ADNI 2 subjects • Apply qualified Ab42, t-tau and p-tau181 to all ADNI GO and ADNI 2 subjects at baseline • Extend to earlier timepoint in the MCI to AD progression biomarker assessments • Plasma Ab42 data on serial plasma samples from ADNI subjects will be generated, analyzed • Apply Rules Based Medicine panel results from ADNI 1 for plasma and CSF • Continue collaboration on the integration of imaging and biochemical biomarker data in a variety of statistical models

  15. Efforts underway to improve standardization • ADNI • Alz Assn International qc program • UPenn/Wash U collaboration underway on ELISA/xMAP relationships • UPenn/BIOCARD collaboration with Marilyn Alberts • Innogenetics-sponsored but investigator-led workgroup on standardization guidelines

  16. It takes a great team effort! John Q Trojanowski Virginia M-Y Lee Chris Clark Steve Arnold Hugo Vanderstichele Magdalena Korecka Margaret Knapik-Czajka Magdalena Brylska Teresa Waligorska Michal Figurski Ravi Patel Leona Fields Uwe Christians Kaj Blennow Holly Soares Adam Simon Robert Dean Eric Siemers Piotr Lewczuk William Potter Supported by the NIH/NIA and families of our patients ADNI investigators include (complete listing available at www.loni.ucla.edu\ADNI\Collaboration\ADNI_Manuscript_Citations.pdf).

More Related