cyp2c19 *2 and *17 alleles have a significant impact on platelet
TRANSCRIPT
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T Cuisset, J Quilici, PE Morange, MC Alessi, JL Bonnet CHU Timone, Marseille, FR
ESC Congress 2012, Munich, Germany
CYP2C19 *2 and *17 alleles have a significant impact on Platelet Response and Bleeding Risk in patients treated with Prasugrel
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Genetic Modulation of Clopidogrel Response
CYP2C19*2 loss-of-function allele
Hulot et al, JACC 2011 Frere et al, AJC 2008
Stent Thrombosis
Impaired Response to clopidogrel Higher Rate of Ischemic Events
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Genetic Modulation of Clopidogrel Response
CYP2C19*17 gain-of-function allele
Sibbing et al, Circulation 2010 Frere et al, JTH 2008
Better Response to clopidogrel Higher Rate of Bleeding Events
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Prasugrel and CYP2C19 variants ?
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CYPC19 variants and Prasugrel Response
0
20
40
60
80
100
wt/wt *2/wt *2/*2
IPA à 4h
Brandt et al, JTH 2007
Healthy Subjects, *17 variant not tested
Platelet testing after loading dose with LTA /ADP-Ag 20 µmol
Clopidogrel 300 mg (n=74)
p=0.003
0
20
40
60
80
100
wt/wt *2/wt *2/*2
IPA à 4h
Prasugrel 60 mg (n=71)
p=0.16
No significant Relationship between *2 and prasugrel response
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Healthy Subjects, n=238, Active MB and LTA / ADP 20 µmol
Mega et al, Circulation 2009
Métabolite Actif LTA ADP 20 µmol
CYPC19 variants and Prasugrel Response
No significant Relationship between *2 and prasugrel response
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Mega et al, Circulation 2009
Active Metabolite
CYPC19 variants and Prasugrel Response
Healthy Subjects, n=238, Active MB and LTA / ADP 20 µmol
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TRITON study, ACS patients on prasugrel, n=1466, *17 not tested
CYP2C19 variants et clinical outcome on prasugrel
Mega et al, Circulation 2009
0
5
10
15
Primary endpoint
*2 Carriers
*2 Non Carriers
HR=0.89, p=0.27
0
1
2
3
4
5
Non CABG TIMI majoror Minor bleedings
*2 Carriers
*2 Non Carriers
HR=1.17, p=0.60
No relationship between *2 and clinical outcomes
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Limitations
• Biological response in healthy subjects
• No idea of impact of *17 on clinical events
• PT used was LTA, no idea with new test (VASP, bedside…)
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Objectives of the present study
Assess the influence of *2 et *17 alleles on:
- Prasugrel Response (PRI VASP) on 10 mg daily
- Incidence of HTPR (PRI VASP>50%)
- Incidence of ‘hyper-response ‘(< 25th percentile)
- Bleeding complications
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Methods
- Single Center, Prospective study
- Consecutive ACS patients treated with prasugrel 10 mg/d
- Platelet Testing at one month on prasugrel with PRI VASP
- Genotyping for CYP2C19 *2 and *17 alleles
- BARC bleedings during one month FU
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Results
- 213 patients included
- Baseline Characteristics: 45% STEMI, 30% DM
- Treatment: 100% ASA < 100 mg, 98% IPP
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PRI VASP in the whole population
Mean PRI VASP = 29%
Incidence HTPR =7%
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Influence of *2 allele on prasugrel response
0
10
20
30
40
PRI VASP
*2 Carriers
*2 Non Carriers
p=0.03
0
5
10
15
20
HTPR
*2 Carriers
*2 Non Carriers
p=0.01
Impaired Response to Prasugrel in *2 Carriers
16%
4%
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0
10
20
30
40
PRI VASP
*17 Carriers
*17 Non Carriers
p=0.03
0
5
10
15
HTPR
*17 Carriers
*17 Non Carriers
p=0.02
Better Response to Prasugrel in *17 Carriers
10%
1%
Influence of *17 allele on prasugrel response
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Definition of ‘hyper response’ to prasugrel
• Defined as PRI VASP < 25th percentile
• PRI VASP < 17%
• 55/213 patients (26%)
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0
5
10
15
20
25
30
35
40
Hyper Response
*17 Carriers
*17 Non Carriers
p=0.02
34%
21%
Higher Incidence of ‘hyper response’ in *17 carriers
Influence of *17 allele on prasugrel response
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Classification according to *2 et *17 alleles
• Poor Metabolizers
(*2 carriers/*17 non carriers) (n=42)
• Intermediate Metabolizers
(*2 carriers/*17 carriers and *2 non carriers/*17 non carriers) (n=107)
• Ultrametabolizers
(*2 non carriers / *17 carriers) (n=64)
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Classification and Prasugrel Response
PR
I V
AS
P (
%)
Poor Metabolizers Intermediate Metabolizers Ultra Metabolizers0
20
40
60
80
p=0.005
Incid
en
ce
of
HT
PR
(PR
I V
AS
P>
50%
)
0
5
10
15
20Poor Metabolizers
Intermediate Metabolizers
Ultra Metabolizers
19%
6 %
1 %
p=0.002
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- 213 patients included
- At 1 month: 15% complications (n=32)
- 16 BARC 1
- 13 BARC 2
- 3 BARC 3
Bleeding Complications
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Relationship PRI VASP and Bleedings with Prasugrel
0
5
10
15
20
25
30
35
PRI VASP
No Bleeding Bleeding
p=0.03
24% 30%
Lower PRI VASP in patients with bleeding complications
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0
5
10
15
20
25
30
BARC Bleeding
Hyper Response
Other patients
p=0.04
12%
24%
Higher Bleeding Risk in prasugrel hyper responders
Relationship Hyper response and Bleedings (PRI VASP < 17%)
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0
5
10
15
20
25
BARC Bleeding
*17 Carriers
*17 Non Carriers
OR 2.5, p=0.02
11%
23%
Higher Bleeding Risk on prasugrel in *17 Carriers
Relationship *17 Allele and Bleedings with Prasugrel
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Conclusion
• Influence of *2 and *17 alleles on prasugrel response
• Higher bleeding risk on prasugrel in *17 carriers
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Perspectives
• Genotyping proposed to avoid clopidogrel in *2 carriers
• Genotyping to select candidates for new drugs ?
Ultra Metabolizers → Clopidogrel ?
Intermediate Metabolizers → Prasugrel ?
Poor Metabolizers → Ticagrelor ?
• Need validation in clinical studies
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Thank You…