Program-Handouts Program... · •Single antigen beads have revolutionized our ability to detect...
Transcript of Program-Handouts Program... · •Single antigen beads have revolutionized our ability to detect...
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2 All Content © Immucor, Inc.
Handouts
http://www.immucor.com/en-us/Pages/Educational-Program-Handouts.aspx
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3 All Content © Immucor, Inc.
2019 Transplant Webinars
Link to register: https://immucor.webinato.com/register
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4 All Content © Immucor, Inc.
Link to register: https://immucor.webinato.com/register
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5 All Content © Immucor, Inc.
learn.immucor.com
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6 All Content © Immucor, Inc.
Continuing Education
• PACE, Florida and California DHS
• 1.0 Contact Hours
• Each attendee must register to receive CE at:
https://www.surveymonkey.com/r/HLAtoolbox
• Registration deadline is March 29, 2019
• Certificates will be sent via email only to those
who have registered April 12, 2019
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7 All Content © Immucor, Inc.
Questions?
• You are all muted
• Q&A following session - Type in questions
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8 All Content © Immucor, Inc.
• Course content is for information and
illustration purposes only. Immucor makes
no representation or warranties about the
accuracy or reliability of the information
presented, and this information is not to be
used for clinical or maintenance evaluations.
• The opinions contained in this presentation
are those of the presenter and do not
necessarily reflect those of Immucor.
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HLA DEPOT: WHAT’S IN YOUR TOOLBOX?
Anne Halpin & Esmé DijkeUniversity of Alberta
Alberta Transplant InstituteEdmonton, Alberta
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DISCLOSURE
This presentation may contain Canadian content
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EVOLUTION IN TOOLS
In the beginning, there were sera, complement, and isolation of cells in straws.
And it was good.
http://www.polysciences.com Pinshow Straw Co
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EVOLUTION IN TOOLS
But as with all great tools, even better tools follow….
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EVOLUTION IN TOOLS
And now these tools are part of the standard of care in the HLA laboratories
http://beckmanflow.com https://www.luminexcorp.com/
Flow cytometry for crossmatch (FCXM)
Luminex technology (for typing and antibody detection)
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EVOLUTION OF HLA TYPING TOOLS
Serology Typing
Molecular Typing• SSO• SSP• rSSO• qPCR
Sequencing• SBT• NGS
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EVOLUTION OF CROSSMATCH TOOLS
• Flow crossmatch still has many possible sources of variability
• Pronase use
• Cell isolation method
• “Halifaster” XM is widely used across Canada (courtesy of Dr. Rob Liwski*)
• Additional solid phase XM tools are also available
Serology XM ELISA XMFlow Cytometry
Crossmatch
*Liwski et al Hum Immunol. 2018 Jan;79(1):28-38
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SINGLE ANTIGEN BEAD TOOLS
• Single antigen beads have revolutionized our ability to detect HLA
antibodies, such as:
• Ability to define HLA specificities in high PRA patients
• Increased sensitivity as compared to CDC
• Class II antibodies are much more easily characterized
• BUT…
• Non-specific reactivity can be observed
• PRA can no longer be defined in the same way
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CALCULATED PANEL REACTIVE ANTIBODY (CPRA)
• The use of single antigen beads allow us to to define antibody specificity in a
new way BUT created a need to re-define PRA values
• UNET created a cPRA tool based on antigen frequencies in the donor pool
• The Canadian Transplant Registry (CTR) created a similar tool
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CPRA UNET
• The UNOS/UNET cPRA
calculator has evolved to
include many alleles
• cPRA is derived from U.S.
deceased donor antigen
frequencies
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CPRA CANADIAN
TRANSPLANT
REGISTRY
• Unacceptable antibody is captured in a
different field
• cPRA is calculated based on Canadian
deceased donor antigen frequencies
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EPITOPE TOOLS
• Epitopes were initially defined by serological methods
• Rodey ’CREG’
• HLA Matchmaker was first described in 2001
• ’Reflections on HLA Epitope-Based Matching for Transplantation’
Rene J. Duquesnoy, Front. Immunol., 28 November 2016
• Today there are many epitope tools available such as
• HLA Matchmaker http://www.epitopes.net
• Epitope Registry http://www.epregistry.com.br
• PIRCHE https://www.pirche.com/pirche/#/
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HOW DO WE USE THESE EPITOPE TOOLS?
• Epitopes can be used for:
• HLA matching
• Transplant risk assessment
• Investigating antibody patterns
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ADDITIONAL TOOLS
• Tools to investigate allele and haplotype frequencies
• Haplostat
https://www.haplostats.org/haplostats?execution=e1s1Allele
• Allele frequencies
http://www.allelefrequencies.net
• IMGT
https://www.ebi.ac.uk/ipd/imgt/hla/
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HOW DO WE USE THESE TOOLS?
CASE STUDY EXAMPLES FROM OUR TRANSPLANT CENTRE
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CASE 1
• 48-year old male with chronic renal failure
• Received first kidney transplant in summer 2015
• Patient typing: A29 B72 Cw12 DR8 DR52 DQ7 DP04:02
A30 B39 DQ4 DP02:01
• Donor typing: A24 B18 Cw17 DR17 DR52 DQ7 DP02:01
A25 B44 Cw11 DR11 DQ2
• Pre-transplant cPRA = 48%, no DSA detected by SAB
• HLA antibodies in cPRA calculation include B37 and DR53
• Both pre-transplant T and B cell flow crossmatch were negative
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CASE 1
• 3 ½ years post-transplant patient developed consistent positive urinalysis for
protein and hemoglobin (creatinine is stable)
• HLA antibody testing was performed at the time of biopsy for cause as per local
centre protocol
• No Class I antibody was detected
• Questionable Class II antibody detected → required further investigation
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CASE 1 Luminex SAB Class II (OLI*): strong reactivity to 1 DQ6 bead: DQB1*06:01
Is this a real antibody?
*OLI: One Lambda Thermo Fisher
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CASE 1Luminex SAB Class II (LC*): also strong reactivity to DQB1*06:01
*LC: LIFECODES Immucor
Patient has allele-specific reactivity to DQB1*06:01 (not DSA)
• non-antibody verified epitope that is specific to DQB1*06:01 = 3P4
http://www.epregistry.com.br
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CASE 1
• 48-year old male with chronic renal failure
• Received first kidney transplant in summer 2015
• Patient typing: A29 B72 Cw12 DR8 DR52 DQ7 DP04:02
A30 B39 DQ4 DP02:01
• Donor typing: A24 B18 Cw17 DR17 DR52 DQ7 DP02:01
A25 B44 Cw11 DR11 DQ2
• 3 ½ years post-transplant patient developed consistent positive urinalysis for protein
and hemoglobin (creatinine is stable)
• No DSA detected (and biopsy showed no evidence of rejection)
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CASE 2
• 56-year old female with coronary artery disease – left ventricular dysfunction
• Listed for heart transplantation
• Sensitizing events: multiple pregnancies, multiple transfusions
• Patient typing: A2 B7 Cw10 DR4 DR53 DQ6 DP04:01
A31 B60 Cw15 DR15 DR51 DQ7
• Work up for listing: questionable Class I antibody was detected
→ required further investigation
• No Class II antibody was detected
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CASE 2Luminex SAB Class I (OLI*): strong reactivity to Cw5
Is this a real antibody?
*OLI: One Lambda Thermo Fisher
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CASE 2Luminex SAB Class I (LC*): strong reactivity to Cw5 and Cw8
C*05:01 and C*08:02: share an eplet 138K
*LC: LIFECODES Immucor
http://www.epregistry.com.br
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CASE 2
Surrogate crossmatch:‘Donor’ typing: A2 B44 Cw5 DR13 DR52 DQ6 DP04:01
A3 B62 Cw9 DR8 DQ4
T-cell flow crossmatch: positiveB-cell flow crossmatch: positive
Patient has strong reactivity to Cw5 (listed as unacceptable antigen)
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CASE 2
• 56-year old female with coronary artery disease – left ventricular dysfunction
• Listed for heart transplantation
• Sensitizing events: multiple pregnancies, multiple transfusions
• Patient typing: A2 B7 Cw10 DR4 DR53 DQ6 DP04:01
A31 B60 Cw15 DR15 DR51 DQ7
• Donor typing: A2 B18 Cw2 DR15 DR51 DQ6 DP04:01
A25 B27 Cw12 DP23
• Both T and B cell crossmatch were negative
• Transplanted in summer 2018
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CASE 3
• 37-year old female with cystic fibrosis listed for lung transplantation
• Sensitizing events: none known at time of listing
• Non-specific patterns of reactivity with weak antibodies to
DQ7, DQ8, DQ9 was observed in single antigen bead assay
• Patient typing: A2 B51 Cw7 DR14 DR52 DQ5 DP04:02
B58 Cw16 DR1 DP02:01
• Donor typing: A1 B8 Cw7 DR17 DR52 DQ7 DP04:01
A26 B56 Cw1 DR11 DQ2 DP10
• Both T and B cell flow crossmatch were NEGATIVE with this previously screened serum
sample BUT were POSITIVE with the immediate pre-transplant serum sample
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CASE 3Luminex SAB Class I (OLI*): strong reactivity to multiple HLA-A and –B alleles
Donor-specific antibody
Self antibody?
• Including to A2: A*02:01, A*02:03 and A*02:06 • Patient typing: A*02:02 and A*02:05
*OLI: One Lambda Thermo Fisher
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CASE 3Luminex SAB Class I (LC*): also strong reactivity to multiple HLA-A and –B alleles
• Including to A*02:01 and A*02:03
• But NOT to A*02:05 and A*02:02
• Reactivity is allele-specific• non-antibody verified epitope = 95V
*LC: LIFECODES Immucor
http://www.epregistry.com.br
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CASE 3Luminex SAB Class II (OLI*): strong reactivity to DQ7, DQ8, DQ9; moderate reactivity to DQ2
Donor-specific antibody
*OLI: One Lambda Thermo Fisher
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CASE 3
• 37-year old female with cystic fibrosis
• Listed for lung transplantation
• Sensitizing events: none known at time of listing
• Patient typing: A2 B51 Cw7 DR14 DR52 DQ5 DP04:02
B58 Cw16 DR1 DP02:01
• Donor typing: A1 B8 Cw7 DR17 DR52 DQ7 DP04:01
A26 B56 Cw1 DR11 DQ2 DP10
• Multiple DSA were observed in immediate pre-transplant sample
• Post transplant monitoring was performed
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CASE 3Antibody tracking over time:
• DSA levels declined over time
• Patient is doing well in this early post-transplant phase
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SUMMARY OF CASES- WHAT WAS IN OUR TOOLBOX
• To investigate these cases we used:
• Multiple vendor kits for antibody analysis
• Epitope analysis
• Surrogate flow crossmatch
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SUMMARY
• We have many tools in our HLA
toolbox
• Our earliest tools were limited
• We now have more tools at our
disposal
• They can be used in combination
https://www.iphonelife.com/blog/31936/taskone-iphone-case-swiss-army-knife-your-phone
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IS OUR TOOLBOX COMPLETE?
• The fields of histocompatibility
and transplantation are most
consistent in their ability to be
constantly evolving
• Our toolbox likely will have more
tools in the future! Star Wars: Episode IV – A New Hope
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THANK YOU!
QUESTIONS?
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• You are all muted
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2019 Advanced Track Webinars
Link to register: https://immucor.webinato.com/register
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Questions?
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• Q&A following session - Type in questions
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47 All Content © Immucor, Inc.
Continuing Education
• PACE, Florida and California DHS
• 1.0 Contact Hours
• Each attendee must register to receive CE at:
https://www.surveymonkey.com/r/HLAtoolbox
• Registration deadline is March 29, 2019
• Certificates will be sent via email only to those
who have registered April 12, 2019
![Page 48: Program-Handouts Program... · •Single antigen beads have revolutionized our ability to detect HLA antibodies, such as: •Ability to define HLA specificities in high PRA patients](https://reader034.fdocuments.in/reader034/viewer/2022050420/5f8f953f24cff05be74ee880/html5/thumbnails/48.jpg)
48 All Content © Immucor, Inc.
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