multicenter study of third-party virus-specific t cells to treat adenovirus, epstein-barr virus or...
TRANSCRIPT
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Multicenter Study of Third-Party Virus-Specific T cells to Treat Adenovirus, Epstein-Barr Virus or Cytomegalovirus Infections after Hematopoietic
Stem Cell Transplantation
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The Center for Cell and Gene Therapy has a Research Collaboration with Celgene and Bluebird Bio Many investigators at the Center (including the presenter) have patent applications in the fields of T cell and gene-modified T cell therapy for cancer
Disclosure
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Viral infections post-transplant
• 40% deaths after alternative donor transplant due to viral infections
• Antiviral drugs –Costly –Significant side effects –Often ineffective
• Alternative - Adoptive T cell transfer
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1
Infusion
Blood draw
T cells
T-cell product generation
Antigen
Specificity
2
3
4
SCT
dono
r SC
T re
cipi
ent
Immunotherapy for viral infections
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Immunotherapy for viral infections
• Virus-specific T cells as prophylaxis
and treatment –EBV –Adv/EBV (bivirus) –Adv/EBV/CMV (trivirus)
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Generation of trivirus-specific T cell lines using Ad5f35 vectors
6 wk PBMC EBV LCL
B95-8 EBV virus
Trivirus CTL
Restimulation
+IL2
6 wk
Ad5f35pp65 transduced EBV LCL
Ad5f35pp65 vector
Ad5f35pp65 vector
PBMC
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• In vitro expanded donor-derived virus-specific T cells targeting Adv, EBV, CMV –Safe –Reconstituted antiviral immunity for
EBV, CMV and Adv –Effective in clearing disease –Considerable expansion in vivo
Clinical Outcome Summary – Donor-specific setting
Leen et al, Nat Med. 2006 Leen et al, Blood. 2009
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The problem
- Individualized products - impractical for widespread/urgent use
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Assess whether banked virus-specific T cells (VSTs) produced clinical benefit in partially HLA-
matched 3rd party recipients
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3rd party VST therapy Bl
ood
dono
r
A1, A24; B8, 18; DR1, 15
EBV activity – B8, DR1 CMV activity – A24 Adv activity – A1, A24, DR15
Trivirus VST
EBV – A1, 11; B8, 35; DR8
MDACC
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3rd party VST therapy Bl
ood
dono
r
A1, A24; B8, 18; DR1, 15
EBV activity – B8, DR1 CMV activity – A24 Adv activity – A1, A24, DR15
Trivirus VST
EBV – A1, 11; B8, 35; DR8
MDACC
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3rd party VST therapy Bl
ood
dono
r
A1, A24; B8, 18; DR1, 15
Trivirus VST
EBV activity – B8, DR1 CMV activity – A24 Adv activity – A1, A24, DR15
CMV – A2, 24; B7, 27; DR1, 15
Adv – A1, 11; B7, 8; DR3, 11
EBV – A1, 11; B8, 35; DR8
CHLA
Boston
MDACC
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VST Product • Most closely HLA-matched trivirus-specific
VSTs –Some VST lines already made for
previous studies –New VST lines made from donors with
common alleles (PACT)
• 32 lines • Multicenter study (TCH, TMH, MDACC, Duke,
Dana Farber, CHLA, Hackensack, Mass General, Uni. Of Miami, Boston Children’s Hospital)
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Phenotype of VSTs
0
20
40
60
80
100
0 1 2 3 4 5 6
% P
ositi
ve c
ells
CD3 CD4 CD8 Effector Central memory memory
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Trivirus specificity of VSTs
1
10
100
1000
10000
0 0.5 1 1.5 2 2.5 3 3.5
SFC
/1x1
05
Adv CMV EBV
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Clinical protocol
• Treatment of refractory EBV, CMV, or Adv
• Patients receive 2 x 107 VSTs/m2
• If partial response may receive additional doses at 2+ weekly intervals
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Screening • 82 patients screened
– 23 - Bone marrow – 33 - Peripheral blood stem cells – 12 - Single cord – 13 - Double cord
• Line identified for 74/82 – Suitable line if matched at least one antigen
with activity against infecting virus
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Screening • 24 patients with line not on study
–subsequently not eligible due to other infections
–improved –progressed and died prior to
infusion –declined
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Patients Treated on Study
• 50 patients infused – 45 evaluable – 19 received VSTs for CMV – 17 received VSTs for Adv – 9 received VSTs for EBV
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Are the VSTs safe?
• Acute GVHD within 45 days first infusion – 8 patients developed GVHD (6 prior history)
• 6 Grade I; 1 Grade II; 1 Grade III
– 1 chronic GVHD flare (discontinued immunosuppression)
• 2 developed transplant-associated microangiopathy (both on sirolimus)
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Pre VSTs
Viral Inclusion
Immunostain for CMV Ulcers on endoscopy
Post-VSTs
No Viral Inclusions
Normal endoscopy
CMV Colitis Responds to VSTs – pt69 Do the VST produce clinical benefit?
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Clinical response correlates with increase in VSTs
0
200
400
600
800
1000
1200
1400
1600
Pre wk1 wk2 wk4 3 mo
SFC
/2x1
05
CMV T cells
Control
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Overall CMV responses
•19 patients treated for CMV
•17/19 responded to VSTs •9 CR •8 PR
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Clinical benefit - Adv
0.E+00
5.E+05
1.E+06
2.E+06
Pre wk1
Stool C
opie
s/m
l
Blood
0
10
20
30
40
0
500
1000
1500
2000
Pre wk2 wk4 wk6
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Clinical benefit - Adv
0
10
20
30
40
0
500
1000
1500
2000
Pre wk2 wk4 wk6
SFC/2x10
5 Blood
Adv T cells
0.E+00
5.E+05
1.E+06
2.E+06
Pre wk1
Stool C
opie
s/m
l
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Overall Adv responses
•17 patients treated for Adv
•14/17 responded to VSTs •7 CR •7 PR
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Clinical Responses –EBV (pt37) Pre VSTs 1 month post VSTs
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Immune Responses –EBV (pt37)
0
20
40
60
80
Pre wk2 wk4
SFC
/2x1
05
EBV T cells
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Overall EBV responses
•9 patients treated for EBV
•6/9 responded to VSTs •2 CR •4 PR
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Do VSTs Persist?
•Deep sequencing TCRs
•Detect specificities in both donor and recipient
VST
line
PT37
Pre infusion PBMCs wk2 wk4
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Pro
babi
lity
0.0
0.2
0.4
0.6
0.8
1.0
Days Post VST Infusion0 7 14 21 28 35 42
Cumulative Incidence of First CR/PR by Infection
CMV (N=23) EBV (N=9)Adenovirus (N=18)
Overall response rate
• Overall 74% 74% - CMV 67% - EBV 79% - Adv • Durable
4 subsequent progression/recurrence
CR/PR based on infection
Days post-VST
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What happened to patients without a line?
•Line identified for 74/82
•8 patients without a suitable line •6 died of progressive infection •1 failed multiple antivirals but eventually cleared post-DLI •1 PR by day 42
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What happened to patients without a line?
•Line identified for 74/82
•8 patients without a suitable line •6 died of progressive infection •1 failed multiple antivirals but eventually cleared post-DLI •1 PR by day 42
•Response rate 13% vs 74% VST group
Leen et al, Blood, in press
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Summary of 3rd Party VST Trial • Low attributable toxicity • VSTs effective in clearing EBV/Adv/CMV
disease • T cell expansion seen in approx. 50% of
responders • May require several infusions to sustain
benefit • Persistence for 12 weeks in a recipient of
a 4/6 matched line
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Solutions
- Individualized products Administration of “off the shelf” T cells
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Ongoing studies
- Individualized products Administration of “off the shelf” T cells
- Simplify manufacture
- Cost - Complexity - Increase breadth of specificity
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TRL Lab PIs Helen Heslop Cliona Rooney Malcolm Brenner
Catherine Bollard Juan Vera
GMP/QC Laboratory Adrian Gee Debbie Lyon Zhuyong Mei Suzanne Poole CTL Laboratory Oumar Diouf Joyce Ku Pallavi Mohpatra Huimin Zhang Weili Liu
TRL Laboratory Ulrike Gerdemann Usha Katari Anastasia Papadopolou Jacqueline Kiernan Joey Tong Lisa Rollins
Clinical Research Bambi Grilley Bridget Medina Alician Brown Yu-Feng Lin
Transplant Service Bob Krance Kathy Leung Caridad Martinez George Carrum Ram Kamble
CHALLAH J. Antin B. Dey D. Avigan P. Szabolcs E.J. Shpall P Kebriaei, N. Kapoor S-Y Pai, S.D. Rowley, BR Dey,
Acknowledgements
Funding: NCI Program Project Grant, NHLBI Somatic Cell Therapy Center, Lymphoma SPORE, Leukemia and Lymphoma Society Specialized Center of Research, Doris Duke Distinguished Clinical Scientist Award, PACT
EMMES Adam Mendizabal Katherine Christensen NMDP Dennis Confer NHLBI John Thomas