1 Updates in Oral Anticoagulation: An Evidence‐ Based Review Mona A. Ali, Pharm.D., BCPS Jenna M. Holzhausen, Pharm.D., BCPS Disclosure Statement The presenters have no actual or potential conflict of interest in relation to this presentation. 2 Objectives • Describe pharmacokinetic and pharmacodynamic characteristics of the direct oral anticoagulants (DOACs) • Evaluate the available literature regarding DOAC use in special populations • Discuss treatment options for the management of DOAC reversal 3
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1
Updates in Oral Anticoagulation: An Evidence‐Based Review
Mona A. Ali, Pharm.D., BCPS
Jenna M. Holzhausen, Pharm.D., BCPS
Disclosure Statement
The presenters have no actual or potential conflict of interest in relation to this
presentation.
2
Objectives
• Describe pharmacokinetic and pharmacodynamiccharacteristics of the direct oral anticoagulants (DOACs)
• Evaluate the available literature regarding DOAC use in special populations
• Discuss treatment options for the management of DOAC reversal
Upreti VV, et al. Br J Pharmacol. 2013;76(6):908‐916.
*Geometric Mean Ratio versus the 65 – 85 kg group (90% confidence interval)
Author’s Conclusion: The modest change in apixaban exposure is unlikely to require dose adjustment based on body weight
alone.
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Dabigatran PK in RE‐LY Trial Patients
• Inverse relationship between concentration and weight
• 21% higher concentration for low BW group
• 21% lower concentration for high BW group
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Reilly PA, et al. J Am Coll Cardiol. 2014;63:321‐328.
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ISTH Guidance Statement
• Recommend appropriate standard dosing of DOACs in patients with BMI ≤ 40 kg/m2 and weight ≤ 120 kg
• Suggest DOACs should NOT be used in patients with BMI > 40 kg/m2 or weight > 120 kg• Limited clinical data available
• PK/PD evidence suggests:• Decreased drug exposures
• Reduced peak concentrations
• Shorter half‐lives
• If used in obese patients, suggest checking peak/trough level• If below expected range, suggest changing to VKA rather than adjusting DOAC dose
Martin K, et al. J Thromb Haemost. 2016;14(6):1308‐1313.
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Anticoagulation Forum Guidance Statement
• Suggest avoiding DOACs for VTE in patients at extremes of weight (e.g., < 50 kg, > 120 kg or BMI ≥ 35 kg/m2)
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Burnett AE, et al. J Thromb Thrombolysis. 2016;41:206‐232.
Extremes of Body Weight Conclusions
• Limit DOAC use in patients < 50 kg or > 120 kg to those who cannot tolerate warfarin
• Increased DOAC exposure in low body weight patients
• Potential for decreased exposure in obese patients
• Proposed management:• < 50 kg: Avoid DOAC use
• 50 kg – 120 kg: DOAC use appropriate
• 121 kg – 150 kg: Limited evidence; may consider DOAC
• > 150 kg: Avoid DOAC unless warfarin not an option
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DOACS FOR THE TREATMENT OF CANCER‐ASSOCIATED VTE
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Epidemiology of Cancer‐Associated VTE
• Cancer increases risk of developing VTE four‐ to seven‐fold
• VTE is associated with high mortality• 2nd leading cause of death in cancer patients
• During anticoagulation, patients with cancer‐associated VTE are at increased risk for:
• VTE recurrence
• Bleeding complications
• Once anticoagulation is withdrawn, risk of VTE recurrence is ≥ 15% per year
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Prandoni P, et al. Blood. 2002;100(10):3484 – 3488.Timp JF, et al. Blood. 2013;122:1712‐1723.
Verso M, et al. Intern Emerg Med. 2015;10:651‐656.
Risk Factors for Cancer‐Associated VTE
Patient‐Related
• Age
• Race
• VTE history
• Obesity
• Platelet count
• Comorbid conditions
Treatment‐Related
• Surgery
• Hospitalization
• Catheters
• Choice of therapy• Chemotherapy
• Hormonal therapy
• Antiangiogenic agents
• Erythropoiesis‐stimulating agent
Cancer‐Related
• Primary site
• Histology
• Stage
• Grade
• Time since diagnosis
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Eichinger S. Thromb Res. 2016;140 Suppl 1:S12‐17.
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Risk of VTE Based on Primary Site
Relative VTE Risk Range: 1.02 to 4.34
Stein PD, et al. Am J Med. 2006;119:60‐68.
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Guideline Recommendations Specific to Cancer‐Associated VTE
CHEST
• LMWH recommended over VKA (Grade 2B) or any DOAC (Grade 2C) for the first 3 months
• Extended anticoagulant therapy (no stop date) is recommended for patients with low‐moderate (Grade 1B) or high (Grade 2B) bleed risk
• In patients not treated with LMWH, no preference stated for VKA vs. DOAC
ASCO
• LMWH recommended for first 5 – 10 days of treatment as well as for long‐term secondary prophylaxis for at least 6 months
• Use of DOACs not recommended for patients with malignancy and VTE due to lack of evidence
NCCN
• LMWH preferred for the first 6 months as monotherapy
• For non‐catheter associated VTE, recommend indefinite anticoagulation while cancer is active, under treatment, or if risk factors for recurrence persist
• For patients who refuse LMWH, a DOAC is an acceptable alternative for management of VTE
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Kearon C, et al. CHEST. 2016;149(2):315‐352. Lyman GH, et al. J Clin Oncol. 2015;33:654‐656.Streiff M, et al. NCCN Guidelines for Cancer‐Associated Venous Thromboembolic Disease (VTE) V.1.2017. NCCN.org.
Vedovati MC, et al. CHEST. 2015;147(2):475‐483.Verso, et al. Intern Emerg Med. 2015;10:651‐656.
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VTE Recurrence in Patients with Cancer: DOAC vs. VKA
AMPLIFY
EINSTEIN‐DVT
EINSTEIN‐PE
HOKUSAI
RECOVER I & II
Favors DOAC Favors VKA
OR (95% CI): 0.63 (0.37 – 1.10)
p = 0.10
Vedovati MC, et al. CHEST. 2015;147(2):475‐483.
N = 1132Event rate: 3.9% (DOAC) vs. 6% (VKA)
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Major and Clinically Relevant Bleeding in Patients with Cancer‐Associated VTE
Major Bleeding Clinically Relevant Bleeding
Favors DOAC Favors VKA Favors DOAC Favors VKA
AMPLIFY EINSTEIN‐DVT/PE HOKUSAIRECOVER I & II
AMPLIFY EINSTEIN‐DVTEINSTEIN‐PE HOKUSAIRECOVER I & II
N = 1114Event rate: 3.2% (DOAC) vs. 4.2% (VKA)OR (95% CI): 0.77 (0.41 – 1.44); p = 0.42
N = 1114Event rate: 14.5% (DOAC) vs. 16.5% (VKA)OR (95% CI): 0.85 (0.62 – 1.18); p = 0.34
Vedovati MC, et al. CHEST. 2015;147(2):475‐483.
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DOAC vs. LMWH?
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Posch F, et al. Thromb Res. 2015;136:582‐589.
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Definition of Active Cancer
Trial DOAC Active Cancer Definition
RECOVER I/II Dabigatran Diagnosis of or any treatment for cancerwithin the last five years
EINSTEIN‐DVT/PE Rivaroxaban Cancer that was diagnosed or treated within the 6 months prior to enrollment or recurrent or metastatic cancer
AMPLIFY Apixaban Cancer that was diagnosed or treated within the 6 months prior to enrollment
HOKUSAI Edoxaban Physician discretion at time of enrollment
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Büller HR, et al. N Engl J Med. 2012;366(14):1287‐97. Schulman S, et al. N Engl J Med. 2009;361(24):2342‐52.Agnelli G, et al. N Engl J Med. 2013;369(9):799‐808. Büller HR, et al. N Engl J Med. 2013;369(15):1406‐15.
Efficacy and Safety of Rivaroxaban in Patients with VTE and Active Malignancy
Type of Cancer n (%)
Genitourinary 28 (23.6)
Gastrointestinal 24 (20.3)
Lung 16 (13.5)
Hematologic/Myeloma 12 (10.1)
Breast 11 (9.3)
Pancreatic 10 (8.4)
Renal 8 (6.7
Sarcoma 2 (1.6)
Brain 2 (1.6)
Other* 5 (4.2)
Bott‐Kitslaar DM, et al. Am J Med. 2016;129(6):615‐619.
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• Single center prospective follow‐up study
• n = 296 patients prescribed rivaroxaban for treatment of VTE
*Includes thyroid, oral, metastatic melanoma, and uncertain primary site
Variable Cancer (n = 118)
No Cancer(n = 178)
p‐Value
VTE recurrence, n(%) 4 (3.3)* 5 (2.8) 0.53
Major Bleed, n(%) 3 (2.5) 0 (0.0) 0.06
NMCRB, n(%) 4 (3.4) 1 (0.6) 0.08
Major and NMCRB, n(%) 7 (5.9) 1 (0.6) 0.008
Minor Bleed, n(%) 3 (2.5) 3 (1.7) 0.69
Death, n(%) 37 (31) 0 (0.0) < 0.0001
*Includes two events that occurred during anticoagulation interruption for an invasive procedure
Patients With and Without Cancer: 3 Month Outcomes
Safe and Effective Use of Rivaroxaban for Treatment of Cancer‐Associated Thromboembolic Disease
New or recurrent VTE, major bleeding, CRNMB leading to rivaroxaban d/c, or
death
Age < 75: Rivaroxaban 15 mg BID x 3 wk, then 20 mg daily.
Age ≥ 75 or PLT 25,000 to 50,000/mcL: Rivaroxaban 10 mg BID x 3 wk, then 15
mg daily
200 patient cohort with cancer‐associated VTE treated with rivaroxaban
Endpoint Mantha, et al Cohort (n=200)
EINSTEIN Cancer Subgroup (n=354)
VTE 4.4% 4.5%
Major Bleed 2.2% 2.3%
CRNMB 3.8% 13.6%
Death 17.6% 7.1%
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Mantha S, et al. J Thromb Thrombolysis. 2017;43:166‐171.Prins MH, et al. Lancet Haematol. 2014;1:e37‐46.
6 month follow‐up
Type of Cancer n (%)
Pancreas 34 (17)
Gynecological 26 (13)
Lung 23 (11.5)
Breast 22 (11)
Genitourinary 21 (10.5)
Colorectal 18 (9)
Hematological 17 (8.5)
Stomach/Esophagus 6 (3)
Other 33 (16.5)
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Limitations to Use of DOACs for Cancer‐Associated VTE
Lack of efficacy / safety data in this population compared to standard of care
Unreliable administration and absorption in patients with nausea/vomiting, diarrhea, and mucosal erosion
Renal and hepatic impairment are common
Lack of experience managing procedures and thrombocytopenia
Nutescu EA et al. Am J Health‐Syst Pharm. 2013;70:1914‐29.Burnett AE et al. J Thromb Thrombolysis. 2016;41:206‐232.
Savaysa (edoxaban) Prescribing information. 2016 Parsippany, NJ: Daiichi Sankyo, Inc.
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Lab Monitoring Below on‐therapy
range On‐therapy range Above on‐therapy
range
Dabigatran
IIIIIIIIIIIIIIIIIIIII TT
Horizontal bars – Correspond to approximate range of detectability (sensitivity) Vertical hatching – Correspond to approximate range of linearity APTT = activated partial, thromboplastin time, PT = prothrombin time , TT = thrombin time
Horizontal bars – Correspond to approximate range of detectability (sensitivity) Vertical hatching – Correspond to approximate range of linearity
Ranges may vary on the based on reagent Cuker A et al. J Am Coll Cardiol. 2014;64:1128‐39
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Lab Monitoring – Bottom LineDrug Lab Effect
Dabigatran APTT • Prolonged aPTT indicates an anticoagulant effect of dabigatran • Normal aPTT does not rule out dabigatran presence but indicates lower drug levels
TT • Normal TT indicates absence of dabigatran
Dilute TT • Quantifies dabigatran drug levels
Factor Xainhibitors(FXa)
APTT • Insensitive to FXa inhibitors, not recommended for monitoring
PT • Prolonged PT may indicate anticoagulant effect of FXa inhibitors (rivaroxaban, edoxaban >>> apixaban)
• Normal PT likely excludes excess levels of rivaroxaban
Chromogenicanti‐Xa
• Quantifies rivaroxaban, apixaban and edoxaban
Reversal should not be delayed in urgent situations for laboratory tests. Delayed turnaround times will diminish usefulness in urgent situations.
Levy JH et al. J Thromb Haemost 2016;14:6 23‐7.Cuker A et al. J Am Coll Cardiol. 2014;64:1128‐39.Samuelson BT et al. Blood Reviews 2017;31:77‐84.
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Reversal Strategies
Non specific reversal strategies
• Activated charcoal
• Hemodialysis
• 4‐Factor prothrombincomplex concentrate (4‐PCC)
• Activated PCC (aPCC)
• Recombinant Factor VIIa
Specific reversal strategies
• Idarucizumab (dabigatran only)
• Andexanet alfa (in development)
• Ciraparantag (in development)
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Non Specific Reversal ‐ Removal
Activated charcoal
• Recent ingestion within 2 hours
Hemodialysis
•Dabigatran only
• Eliminates ~65% of circulating dabigatribanafter 2‐4 hours
Wang et al. Am J Cardiovasc Drugs. 2014;14(2):147‐154.Stangier et al. Clin Pharmacokinet. 2010;49(4):259‐68.
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Non Specific Reversal – Bypassing 4 ‐PCC(Kcentra)
aPCC(FEIBA)
rVIIa(Novoseven)
Product composition
Factors II, VII, IX & X Protein C, S Heparin
Factors II, VII (activated) , IX & X Protein C, S
Factor VIIa(activated)
Literature –animal models, ex‐vivo studies, case series
Generally corrected coagulation and thrombin generation parameters
Corrected coagulation and thrombin generation parameters
Variable ability to correct coagulation and thrombin generation parameters
Disadvantage Increased risk of thrombotic complications;Heparin allergy
Increased risk of thrombotic complications
Meta‐analysis suggests thrombosisrisk >> PCCs
XSiegel et al. Drug Discov Today. 2014;19(9):1465‐1470.
Burnett AE et al. J Thromb Thrombolysis. 2016;41:206‐232.Dager W et al. Am J Health‐Syst Pharm 2016;73(suppl 2):S14‐26.
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Non Specific Reversal – Bypassing 4 ‐PCC(Kcentra)
aPCC(FEIBA)
rVIIa(Novoseven)
Product composition
Factors II, VII, IX & X Protein C, S Heparin
Factors II, VII (activated) , IX & X Protein C, S
Factor VIIa(activated)
Literature –animal models, ex‐vivo studies, case series
Generally corrected coagulation and thrombin generation parameters
Corrected coagulation and thrombin generation parameters
Variable ability to correct coagulation and thrombin generation parameters
Disadvantage Increased risk of thrombotic complications;Heparin allergy
Increased risk of thrombotic complications
Meta‐analysis suggests thrombosisrisk >> PCCs
XFor patients that require emergent reversal of FXa inhibitors for severe or life‐threatening bleeding consider: • 4‐PCCs (Kcentra) ~50 units/kg • aPCC (FEIBA) ~50 units/kg
Siegel et al. Drug Discov Today. 2014;19(9):1465‐70.Burnett AE et al. J Thromb Thrombolysis. 2016;41:206‐232.
Dager W et al. Am J Health‐Syst Pharm 2016;73(suppl 2):S14‐26.Rossaint et al. Critical Care (2016) 20:100.
Frontera JA et al. Neurocrit Care 2016;24:6‐46.
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Idarucizumab (Praxbind®)
•Humanized monoclonal antibody fragment
•Binds to dabigatran and its metabolites
•Onset: < 5 minutes
• T1/2: 47 min (terminal ~10.3 h)
•Dose: 5g (2.5 g x 2 doses)
• Elimination: Renal
Praxbind® [package insert]. Ridgefield, CT: Boehringer Ingelheim Pharmaceuticals, Inc.; 2015.Pollack CV Jr et al. Thromb Haemost. 2015 Jul;114(1):198‐205.
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Idarucizumab for Dabigatran Reversal AKA “RE‐VERSE AD”
Prospective, single arm, multicenter phase III clinical trial
Inclusion• Overt, uncontrollable, or life‐threatening bleeding with dabigatran
(Group A) • Surgery or procedure could not be delayed for ≥ 8 hours (Group B)
Study Drug Idarucizumab 5 g IV once (2 x 2.5 g doses administered within 15 minutes)
Primary Endpoint
Percent reversal of anticoagulation up to 4 hours after idarucizumab measured by dilute thrombin time(dTT) and ecarin clotting time(ECT)
Secondary Endpoints
• Duration of reversal up to 24 hours after idarucizumab administration as measured by dabigatran levels
• Hemostasis following idarucizumab administration for serious bleeding• Intraoperative hemostasis as classified by physician• Thrombotic events • Mortality
Pollack CV et al. N Engl J Med 2017; 377:431‐441.
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RE‐VERSE AD‐Group A Results
• Source GI > ICH > Trauma
• Last dose ~15 hrs
Bleeding patients (N=301)
• N=276 with abnormal dTTor ECT included
• Median max reversal 100% based (based on dTT or ECT)
Reversal within 4 hours
• All confirmed cessation within 24 hrs
• Median time to hemostasis was 2.5 hrs
Bleeding cessation
confirmation (N=134)
Pollack CV et al. N Engl J Med 2017; 377:431‐441.
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RE‐VERSE AD‐Group B Results
• Last dose ~18 hrs
• Median time from first infusion to procedure initiation: 1.6 hrs
Surgical patients (N=202)
• N=185 with abnormal dTT or ECT included
• Median max reversal 100% based (based on dTT or ECT)
Reversal within 4 hrs
• Normal in 184 pts (93%)
• Mildly abnormal in 10 pts(5%)
• Moderately abnormal in 3 pts(2%)
Peri‐procedural hemostasis (N=197)
Pollack CV et al. N Engl J Med 2017; 377:431‐441
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RE‐VERSE AD Safety Group A (N=301)
Group B(N=202)
Mortality30 d, %90 d, %
13.5%18.8%
12.6%18.9%
Thrombotic Events* 30 d, N (%)90 d, N (%)
14 (4.7%)19 (6.3%)
10 (4.9%)15 (7.4%)
ImmunogenicityAnti‐idarucizumab antibodies
28/501 (5.6%)
No detectable effect on idarucizumab activity
*Three patients in group A and 5 patients in group B received anticoagulation (treatment or prophylaxis) prior to event
Pollack CV et al. N Engl J Med 2017; 377:431‐441
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RE‐VERSE AD Safety
Recurrence of elevated dabigatran levels (>20 ng/ml) Recurrence of elevated dabigatran levels (>20 ng/ml)
• Observed at 12 hrs in 23% (144/497) and at 24 hrs in 13% (67/497) of patients
• Associated with recurrent bleeding in 10 patients
Repeat dosing required in 8 patientsRepeat dosing required in 8 patients
• Due to recurrent bleeding or requiring second procedure
Consider a second 5g dose of idarucizumab if• Clinically significant bleeding along with elevated coagulation parameters recurs
• Additional procedure required in patient with elevated coagulation parameters
Pollack CV et al. N Engl J Med 2017; 377:431‐441Praxbind® [package insert]. Ridgefield, CT: Boehringer Ingelheim Pharmaceuticals, Inc.; 2015.
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Idarucizumab Considerations and Remaining Questions
Are clinical outcomes improved in bleeding patients? Are clinical outcomes improved in bleeding patients?
Significance of increased dabigatran levels? Significance of increased dabigatran levels?
Is 5gm sufficient for patients with acute renal failure or in the case of an overdose?Is 5gm sufficient for patients with acute renal failure or in the case of an overdose?
Can we administer idarucizumab to allow for thrombolytic administration in ischemic stroke patients? Can we administer idarucizumab to allow for thrombolytic administration in ischemic stroke patients?
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Andexanet Alfa
•Decoy FXa molecule that binds FXa inhibitors restoring function of endogenous Fxa
•Also reverses UFH, LMWH and fondaparinux
•Onset < 2 minutes
•Half‐life 1 hour
• Investigational
Burnet A et al. BMJ 2017;357:j2216.Milling TJ et al. Am J Med. 2016, 129:S80‐S88.
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Andexanet Alfa in Healthy Subjects
Rapidly reduced unbound FXainhibitor concentrations leading to restored FXa activity and thrombin generation
Rapidly reduced unbound FXainhibitor concentrations leading to restored FXa activity and thrombin generation
Two hours following andexanet alfa infusion, unbound drug concentrations returned back to placebo associated levels
Two hours following andexanet alfa infusion, unbound drug concentrations returned back to placebo associated levels
Transient elevations in D‐dimer and Prothrombin fragments 1 and 2
Transient elevations in D‐dimer and Prothrombin fragments 1 and 2
Siegal DM et al. N Engl J Med 2015;373:2413‐24.
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Andexanet Alfa for FXa Inhibitor Associated
Major Bleeding AKA “ANNEXA‐4”Prospective, single arm, ongiong multicenter phase III clinical trial
Inclusion• Acute major bleeding within 18 hours of FXa inhibitor (apixaban,
rivaroxaban, edoxaban or enoxaparin) administration
Study Drug
Andexanet alfa bolus and infusion: • Apixaban or Rivaroxaban (>7 hours ago): 400mg bolus followed by
480mg infusion over 2 hours• Rivaroxaban (≤ 7 hours ago), enoxaparin or edoxaban: 800 mg bolus
followed by 960 mg infusion over 2 hrs
Primary Endpoints
• Percent change in the anti–factor Xa activity (chromogenic FXa assay)• Rate of excellent or good hemostatic efficacy 12 hours after infusion • Efficacy analysis included
• Anti‐Xa level ≥ 75 ng/ml or ≥ 0.5 U/ml for enoxaparin
Patient population
• 67 patients with acute major bleeding • GI bleed 33 (49%)• ICH 28 (42%)
• Mean time to andexanet bolus was 4.8 +/‐ 1.9 hrsConnolly SJ et al. N Engl J Med 2016;375:1131‐41.
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ANNEXA‐4 Results
Efficacy analysis:
• Anti‐FXa activity and change from baseline
• N=47
↓89%
↓93%
↓39%
↓30%
Connolly SJ et al. N Engl J Med 2016;375:1131‐41.
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ANNEXA‐4 Hemostatic Efficacy
79% (37/47) of patients experienced good or excellent hemostatic response*
• Excellent – 66% (31) of patients
• Good – 13% (6) of patients
19% (9/47) of patients experienced poor/no hemostatic response*
• Rivaroxaban – 5 patients
• Apixaban – 4 patients
*One patient not evaluatedConnolly SJ et al. N Engl J Med 2016;375:1131‐41.
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ANNEXA‐4 Safety N=67
30 d Mortality, N (%)
Cardiovascular causes
Non‐cardiovascular causes
10 (15%)
6 (9%)
4 (6%)
30 d Thrombotic Events, N‐patients (%)*
Deep vein thrombosis
Pulmonary Embolism
Stroke
Myocardial infarction
12 (18%)
7
1
5
1
*Several patients had more than one thrombotic event
Two patients received anticoagulation prior to thrombotic event
Connolly SJ et al. N Engl J Med 2016;375:1131‐41.
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Andexanet Alfa Considerations and Remaining Questions
Are clinical outcomes improved in bleeding patients? Are clinical outcomes improved in bleeding patients?
Does extending infusion improve efficacy?Does extending infusion improve efficacy?
Dosing in patients requiring emergent surgery?Dosing in patients requiring emergent surgery?
When can anticoagulation be restarted? When can anticoagulation be restarted?
Limited data with enoxaparin, edoxaban and betrixabanLimited data with enoxaparin, edoxaban and betrixaban
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Andexanet Alfa Moving Forward
Aug 2016 – FDA complete response letter required more data:
• Manufacturing process
• Edoxaban, enoxaparin
Portola resubmit Biologics License Application in Aug
2017
FDA response expected in Feb 2018
http://investors.portola.com
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Ciraparantag
• Synthetic molecule
• Binds to anticoagulants via non‐covalent hydrogen binding blocking target sites of FXa and FIIa
• Binds to DOACs, heparins, and fondaparinux
• Onset 5‐10 minutes
• Duration of action ~24 hours
• Reversal measured with whole‐blood clotting time(WBCT)
Burnet A et al. BMJ 2017;357:j2216.Milling TJ et al. Am J Med. 2016, 129:S80‐S88.
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Ciraparantag in Healthy Subjects
• Fast, sustained reversal of edoxaban based on WBCT
• No measurable thrombotic effects
Ciraparantag
Ansell et al. Thromb Haemost 2017;117:238‐245.
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Ciraparantag –Moving Forward
Received fast‐tracked status in April 2015
Currently in Phase II studies
http://perosphere.com/content
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When to Use Antidotes? In Favor
Life‐threatening bleeding: Intracranial hemorrhage or uncontrollable hemorrhage
Bleeding in a closed space or critical organ
Persistent major bleeding despite local hemostatic measures or risk of recurrent bleeding due to delayed DOAC clearance or overdose
Need for urgent intervention with high risk of bleeding that cannot be delayed
Emergency surgery or intervention in patients at high risk for procedural bleeding
Potential
Need for urgent surgery or intervention in patients with acute renal failure
Levy JH et al. J Thromb Haemost 2016;14:6 23‐7.
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When Not to Use Antidotes? Against use
Gastrointestinal bleeds that respond to supportive measures
Elective surgery
Need for surgery or intervention that can be delayed long enough to
permit DOAC clearance
High drug levels or excessive anticoagulation without associated bleeding
Levy JH et al. J Thromb Haemost 2016;14:6 23‐7.
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Reversal Summary
•DOAC reversal will vary based on the pharmacokinetics of the agent involved, urgency of the situation and the time of last dose
•Certain lab parameters may be helpful in identifying and quantifying anticoagulation activity
•Use of PCCs/aPCCs may be effective and should be considered after weighing the risks of thrombosis if emergent reversal is indicated
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Reversal Summary
• Idarucizumab effectively reverses dabigatran in patients with life threatening bleeds or undergoing urgent procedures
• Investigational agents, andexanet alfa and ciraparantag, are promising antidotes, and there is much to be known about their use
•Guidance for when to use specific reversal agents is available from the ISTH
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Updates in Oral Anticoagulation: An Evidence‐Based Review