The changing world of adjunctive pharmacology Rob Storey Reader and Honorary Consultant in Cardiology, University of Sheffield Disclosures Company Name • AstraZeneca Relationship Research grants, speaker fees, consultant, travel • Eli Lilly / Daiichi Sankyo Research grant, speaker fees, consultant, travel • Schering-Plough Research grant, consultant • Teva Consultant • Novartis Consultant • The Medicines Company Consultant • Dynabyte Research consumables 2 Targets for Platelet Inhibition TERUTROBAN HEPARINS FONDAPARINUX Thromboxane A2 BIVALIRUDIN Coagulation RIVAROXABAN APIXABAN DABIGATRAN Thrombin TPa ASPIRIN x x x 5HT Collagen x GPVI 5HT ADP 5HT2A ADP ATP ADP TICLOPIDINE CLOPIDOGREL PRASUGREL ATP P2Y1 P2X1 PAR-4 ACTIVE METABOLITE PAR-1 SCH 530348 E5555 Thrombin generation Shape change Dense granule PLATELET ACTIVATION x P2Y12 TICAGRELOR CANGRELOR Amplification Alpha granule aIIb b3 Coagulation factors Inflammatory mediators aIIb b3 Aggregation x Fibrinogen aIIb b3 GP IIb/IIIa ANTAGONISTS GP = glycoprotein; PAR = protease-activated receptor; TP = thromboxane A2 / prostaglandin H2. Storey RF. Curr Pharm Des. 2006;12:1255-1259. P2Y12 as a therapeutic target Thromboxane A2 Coagulation 5HT Collagen GPVI Thrombin TPa 5HT ADP 5HT2A ADP ATP ADP TICLOPIDINE CLOPIDOGREL PRASUGREL ATP P2Y1 P2X1 PAR-4 ACTIVE METABOLITE PAR-1 Dense granule Thrombin generation Shape change PLATELET ACTIVATION x P2Y12 Amplification Alpha granule aIIb b3 Coagulation factors Inflammatory mediators aIIb b3 Aggregation Fibrinogen GP = glycoprotein; PAR = protease-activated receptor; TP = thromboxane A2 / prostaglandin H2. Storey RF. Curr Pharm Des. 2006;12:1255-1259. aIIb b3 TICAGRELOR CANGRELOR Activation/inactivation of clopidogrel OCH3 O N O CYPs OCH3 COOH CYPs N O OCH3 N O S S Cl Clopidogrel Esterases Cl 2-Oxo-clopidogrel O OH N S Cl SR26334 (Inactive) CYP5= cytochrome P450. Farid NA, et al. Clin Pharmacol Ther. 2007;81:735-741. HS Cl R-130964 Platelet aggregation before and 4 hours after clopidogrel 600 mg in patients undergoing PCI Whole blood single platelet counting in response to ADP 10 uM 100 Patient with subacute stent thrombosis % aggregation 80 60 40 20 0 Baseline Smith SMG et al. Platelets 2006; 17: 250-258 Post clopidogrel VerifyNow P2Y12 assay 7 Multiplate MEA 8 Clinical outcomes according to platelet aggregometry results with MEA Sibbing, D. et al. JACC 2009; 53: 849-56 Clopidogrel, CYP 2C19 and stent thrombosis Sibbing, D. et al. Eur Heart J 2009 30:916-922 Prasugrel 11 Comparison of prasugrel with higher dose clopidogrel IPA (%; 20 mM ADP) N=201 P<0.0001 for each IPA (%; 20 mM ADP) P<0.0001 Prasugrel 60 mg Clopidogrel 600 mg Hours Wiviott et al Circ 2007 Clopidogrel Prasugrel 150 mg 10 mg 14 Days TRITON Study Design ACS (STEMI or UA/NSTEMI) & Planned PCI N= 13,600 ASA Double-blind CLOPIDOGREL 300 mg LD/ 75 mg MD PRASUGREL 60 mg LD/ 10 mg MD Median duration of therapy - 12 months 1o endpoint: 2o endpoints: CV death, MI, Stroke CV death, MI, Stroke, Rehosp-Rec Isch, CV death, MI, UTVR Stent Thrombosis (ARC definite/prob.) Safety endpoints: TIMI major bleeds, Life-threatening bleeds Key Substudies: Pharmacokinetic, Genomic TRITON-TIMI study Balance of Efficacy and Safety 15 138 events Clopidogrel 12.1 HR 0.81 (0.73-0.90) P=0.0004 9.9 NNT = 46 CV Death / MI / Stroke Endpoint (%) 10 Prasugrel 5 TIMI Major NonCABG Bleeds 35 events Prasugrel Clopidogrel 2.4 HR 1.32 1.8 (1.03-1.68) P=0.03 0 0 30 60 90 180 Days 270 360 450 NNH = 167 TRITON-TIMI study Stent Thrombosis (ARC Definite + Probable) 3 Any Stent at Index PCI N= 12,844 2.4 (142) Clopidogrel Endpoint (%) 2 1.1 (68) 1 Prasugrel HR 0.48 P <0.0001 NNT= 77 0 0 30 60 90 Days 180 270 360 450 TRITON Diabetic Subgroup N=3146 18 Clopidogrel 17.0 16 CV Death / MI / Stroke Endpoint (%) 14 12.2 12 HR 0.70 P<0.001 NNT = 46 Prasugrel 10 8 6 TIMI Major NonCABG Bleeds 4 2 Clopidogrel Prasugrel 2.6 2.5 0 0 30 60 90 180 Days 270 360 450 TRITON STEMI cohort Clopidogrel Prasugrel 15 Primary EP (CV death, MI and stroke at 15 months) Proportion of patients (%) 12.4 p=0.02 10.0 RRR=21% 10 9.5 p=0.002 RRR=32% 6.5 5 HR=0.79 (0.65–0.97) NNT=42 Age-adjusted HR=0.81 (0.66-0.99) 0 0 50 100 150 200 250 300 350 400 450 Time (Days) Montalescot et al. ESC 2008 TRITON Net Clinical Benefit Bleeding Risk Subgroups Post-hoc analysis Risk (%) Prior Stroke / TIA Age Yes + 37 No Pint = 0.006 -1 >=75 -16 Pint = 0.18 < 75 Wgt -16 +3 < 60 kg >=60 kg Pint = 0.36 -14 -13 OVERALL 0.5 1 Prasugrel Better HR 2 Clopidogrel Better Ticagrelor The first oral reversible P2Y12 antagonist ONSET/OFFSET Study IPA with ADP 5uM (final extent) Ticagrelor 180mg LD / 90 mg bd (n=54) Clopidogrel 600mg LD / 75 mg od (n=50) 100 * 90 * * * * * † * 80 * 70 IPA % 60 50 * 40 ‡ 30 † 20 10 0 0 .5 1 Onset Gurbel PA et al. Circulation 2009 2 4 8 24 6 weeks 0 2 Maintenance Time (hours) 4 8 24 Offset 48 72 120 168 240 PLATELET REACTION UNITS (PRU) PLATO PLATELET – VerifyNow P2Y12 assay comparing maintenance therapy with clopidogrel (C) vs ticagrelor (T) 500 **** **** 400 300 235 PRU 200 100 0 C T Trough C T Peak Storey RF et al. Presented at American Heart Association annual scientific sessions Nov 2009 Secondary efficacy endpoints over time Cardiovascular death Myocardial infarction 7 6 4 3 2 1 HR 0.84 (95% CI 0.75–0.95), p=0.005 0 0 60 120 180 240 300 360 Clopidogrel 5 Ticagrelor Cumulative incidence (%) Cumulative incidence (%) 6 5.8 5 No. at risk 7 6.9 Clopidogrel 5.1 4.0 4 Ticagrelor 3 2 1 HR 0.79 (95% CI 0.69–0.91), p=0.001 0 0 60 120 180 240 300 360 Days after randomisation Days after randomisation 9,333 8,678 8,520 8,279 6,796 5,210 4,191 9,333 8,294 8,822 8,626 7119 5,482 4,419 Clopidogrel 9,291 8,560 8,405 8,177 6,703 5,136 4,109 9,291 8,865 8,780 8,589 7079 5,441 4,364 Ticagrelor Total major bleeding 13 NS 12 11.6 Ticagrelor Clopidogrel 11.2 11 NS 10 7.9 8 K-M estimated rate (% per year) 8.9 NS 9 8.9 7.7 NS 7 5.8 6 5.8 5 4 3 2 NS 1 0.3 0.3 0 PLATO major bleeding TIMI major bleeding Red cell transfusion* PLATO lifethreatening/ fatal bleeding Fatal bleeding Major bleeding and major or minor bleeding according to TIMI criteria refer to non-adjudicated events analysed with the use of a statistically programmed analysis in accordance with definition described in Wiviott SD et al. NEJM 2007;357:2001–15; *Proportion of patients (%); NS = not significant Non-CABG and CABG-related major bleeding 9 Ticagrelor Clopidogrel NS 7.9 8 7.4 K-M estimated rate (% per year) 7 NS 5.8 6 5.3 p=0.026 5 4 4.5 3.8 p=0.025 2.8 3 2.2 2 1 0 Non-CABG PLATO major bleeding Non-CABG TIMI major bleeding CABG PLATO major bleeding CABG TIMI major bleeding PLATO - Dyspnoea All patients Ticagrelor Clopidogrel (n=9,235) (n=9,186) p value* Dyspnoea, % Any 13.8 7.8 <0.001 With discontinuation of study treatment 0.9 0.1 <0.001 *p values were calculated using Fischer’s exact test PLATO Conclusions • Reversible, more intense P2Y12 receptor inhibition for one year with ticagrelor in comparison with clopidogrel in a broad population with ST- and non-ST-elevation ACS provides – Reduction in myocardial infarction and stent thrombosis – Reduction in cardiovascular and total mortality – No change in the overall risk of major bleeding • Ticagrelor is a more effective alternative than clopidogrel for the continuous prevention of ischaemic events, stent thrombosis and death in the acute and long-term treatment of patients with ACS • Clinicians will need to learn how to identify and manage dyspnoea associated with ticagrelor Cangrelor Intravenous reversible P2Y12 antagonist Inactivation by Dephosphorylation S HN N N F + 4Na _ O Cl O O O O O P P P _ Cl _ _ O O O N N S F F O OH OH S HN N N N HO O OH OH N F S F F BRIDGE study design (provisional) ACS treated with clopidogrel, scheduled for CABG Stop clopidogrel x days prior to CABG Placebo infusion Cangrelor infusion PD measurements Stop x hours prior to CABG surgery Primary objective: To assess safety of cangrelor compared to placebo prior to CABG surgery 1o end point: Bleeding 2o end points: Inhibition of platelet function, ischaemic events Elinogrel Intravenous and oral reversible P2Y12 antagonist Elinogrel • Reversible P2Y12 inhibitor in phase 2/3 development • IV and oral formulations • Half-life ~12 hours • Competitive mechanism of action – competes with ADP for binding to receptor, greater IPA for low vs high concentrations of ADP Targeting PAR-1 32 Targets for Platelet Inhibition TERUTROBAN HEPARINS FONDAPARINUX Thromboxane A2 BIVALIRUDIN Coagulation RIVAROXABAN APIXABAN DABIGATRAN Thrombin TPa ASPIRIN x x x 5HT Collagen x GPVI 5HT ADP 5HT2A ADP ATP ADP TICLOPIDINE CLOPIDOGREL PRASUGREL ATP P2Y1 P2X1 PAR-4 ACTIVE METABOLITE PAR-1 Dense granule SCH 530348 E5555 Thrombin generation Shape change PLATELET ACTIVATION x P2Y12 TICAGRELOR CANGRELOR Amplification Alpha granule aIIb b3 Coagulation factors Inflammatory mediators aIIb b3 Aggregation x Fibrinogen aIIb b3 GP IIb/IIIa ANTAGONISTS GP = glycoprotein; PAR = protease-activated receptor; TP = thromboxane A2 / prostaglandin H2. Storey RF. Curr Pharm Des. 2006;12:1255-1259. No significant compromise to haemostasis with SCH 530348 3 * * 2 1 B leeding tim e T em p late b leed in g tim e (m in) B lo o d L o ss (m ls) S urgical blood loss (m l/hr) 0 30 * * T-2 T-3 20 10 0 Vehicle T-1 T-2 T-3 T ream ent T-1 = SCH 530348 1 mg/kg T-2 = Aspirin (10 mg/kg) plus Clopidogrel (2 mg/kg) T-3 = SCH 530348, Aspirin plus Clopidogrel Vehicle T-1 T reatm ent Cynomolgus monkey model. Chintala M et al. Arterioscl Thromb Vasc Biol. 2008; 28: e138–e139 TRACER Study Design Moderate- to High-Risk ACS patients (UA/NSTEMI, PCI, Medically-Managed, or CABG) Standard therapy + placebo (N=10,000) Standard therapy + SCH 530548 40 mg LD then 2.5 mg od 12-month minimum exposure Primary end point: CV death/MI/stroke/recurrent ischaemia with rehospitalisation/urgent coronary revascularisation Study started December 2007 Estimated study completion July 2011 Questions TERUTROBAN HEPARINS FONDAPARINUX Thromboxane A2 BIVALIRUDIN Coagulation RIVAROXABAN APIXABAN DABIGATRAN Thrombin TPa ASPIRIN x x x 5HT Collagen x GPVI 5HT ADP 5HT2A ADP ATP ADP TICLOPIDINE CLOPIDOGREL PRASUGREL ATP P2Y1 P2X1 PAR-4 ACTIVE METABOLITE PAR-1 SCH 530348 E5555 Thrombin generation Shape change ? Dense granule P2Y12 Coagulation factors Inflammatory mediators TICAGRELOR CANGRELOR Amplification Alpha granule aIIb b3 x aIIb b3 Fibrinogen Aggregation x aIIb b3 GP IIb/IIIa ANTAGONISTS GP = glycoprotein; PAR = protease-activated receptor; TP = thromboxane A2 / prostaglandin H2. Storey RF. Curr Pharm Des. 2006;12:1255-1259.