Ticagrelor Drug Information
Generic name: TICAGRELOR
P2Y12 Platelet Inhibitor [EPC]
Uses of Ticagrelor
Acute Coronary Syndrome or a History of Myocardial Infarction Ticagrelor tablets are
indicated to reduce the risk of cardiovascular (CV) death, myocardial infarction (MI), and stroke in patients with acute coronary syndrome (ACS) or a history of MI. For at least the first 12 months following ACS, it is superior to clopidogrel. Ticagrelor tablets also reduces the risk of stent thrombosis in patients who have been stented for treatment of ACS.
Coronary Artery Disease but No
Prior Stroke or Myocardial Infarction Ticagrelor tablets are indicated to reduce the risk of a first MI or stroke in patients with coronary artery disease (CAD) at high risk for such events. While use is not limited to this setting, the efficacy of ticagrelor was established in a population with type 2 diabetes mellitus (T2DM).
Acute Ischemic Stroke or Transient Ischemic Attack (TIA) Ticagrelor tablets are indicated
to reduce the risk of stroke in patients with acute ischemic stroke (NIH Stroke Scale score ≤5) or high-risk transient ischemic attack (TIA).
Dosage & Administration of Ticagrelor
General Instructions Advise patients who miss a dose of ticagrelor tablets to
take their next dose at its scheduled time. For patients who are unable to swallow tablets whole, ticagrelor tablets can be crushed, mixed with water, and drunk. The mixture can also be administered via a nasogastric tube (CH8 or greater). Do not administer ticagrelor tablets with another oral P2Y 12 platelet inhibitor.
Avoid aspirin at doses higher than recommended.
Acute Coronary Syndrome or a History of Myocardial Infarction Initiate treatment with
a 180 mg loading dose of ticagrelor tablets. Administer the first 90 mg maintenance dose of ticagrelor tablets, 6 to 12 hours after the loading dose. Administer 90 mg of ticagrelor tablets twice daily during the first year after an ACS event.
After one year, administer 60 mg of ticagrelor tablets twice daily. Initiate ticagrelor tablets with a daily maintenance dose of aspirin of 75 mg to 100 mg. However, in patients who have undergone percutaneous coronary intervention (PCI), consider single antiplatelet therapy with ticagrelor tablets based on the evolving risk for thrombotic versus bleeding events.
Coronary Artery Disease but No
Prior Stroke or Myocardial Infarction Administer 60 mg of ticagrelor tablets twice daily. Generally, use ticagrelor tablets with a daily maintenance dose of aspirin of 75 mg to 100 mg.
Acute Ischemic Stroke or Transient Ischemic Attack (TIA) Initiate treatment with a
180 mg loading dose of ticagrelor tablets and then continue with 90 mg twice daily for up to 30 days. Administer the first maintenance dose 6 to 12 hours after the loading dose. Use ticagrelor tablets with a loading dose of aspirin (300 mg to 325 mg) and a daily maintenance dose of aspirin of 75 mg to 100 mg.
Side Effects of Ticagrelor
- The following adverse reactions are also discussed elsewhere in the labeling:
- Bleeding [see Warnings and Precautions ( 5.1 )]
- Dyspnea [see Warnings and Precautions ( 5.3 )] Most common adverse reactions (>5%) are bleeding and dyspnea. ( 5.1 , 5.3 , 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Dr. Reddy’s Laboratories Inc., at 1-888-375-3784 or FDA at 1-800-FDA-1088or www .fda.gov/medwatch. 6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. Ticagrelor has been evaluated for safety in more than 58,000 patients. Bleeding in PLATO (Reduction in risk of thrombotic events in ACS) Figure 1 is a plot of time to the first non-CABG major bleeding event. Figure 1- Kaplan-Meier estimate of time to first non-CABG PLATO-defined major bleeding event (PLATO) Frequency of bleeding in PLATO is summarized in Tables 1 and 2. About half of the non-CABG major bleeding events were in the first 30 days. Table 1 - Non-CABG related bleeds (PLATO) Ticagrelor * N=9235 Clopidogrel N=9186 n (%) patients with event n (%) patients with event PLATO Major + Minor 713 (7.7) 567 (6.2) Major 362 (3.9) 306 (3.3) Fatal/Life-threatening 171 (1.9) 151 (1.6) Fatal 15 (0.2) 16 (0.2) Intracranial hemorrhage (Fatal/Life-threatening) 26 (0.3) 15 (0.2) PLATO Minor bleed: requires medical intervention to stop or treat bleeding. PLATO Major bleed : any one of the following: fatal; intracranial; intrapericardial with cardiac tamponade; hypovolemic shock or severe hypotension requiring intervention; significantly disabling (e.g., intraocular with permanent vision loss); associated with a decrease in Hb of at least 3 grams/dL (or a fall in hematocrit (Hct) of at least 9%); transfusion of 2 or more units. PLATO Major bleed, fatal/life-threatening: any major bleed as described above and associated with a decrease in Hb of more than 5 grams/dL (or a fall in hematocrit (Hct) of at least 15%); transfusion of 4 or more units. Fatal: A bleeding event that directly led to death within 7 days. * 90 mg BID No baseline demographic factor altered the relative risk of bleeding with ticagrelor compared to clopidogrel. In PLATO, 1,584 patients underwent CABG surgery. The percentages of those patients who bled are shown in Figure 2 and Table 2. Figure 2 – ‘Major fatal/life-threatening’ CABG-related bleeding by days from last dose of study drug to CABG procedure (PLATO) X-axis is days from last dose of study drug prior to CABG. The PLATO protocol recommended a procedure for withholding study drug prior to CABG or other major surgery without unblinding. If surgery was elective or non-urgent, study drug was interrupted temporarily, as follows: If local practice was to allow antiplatelet effects to dissipate before surgery, capsules (blinded clopidogrel) were withheld 5 days before surgery and tablets (blinded ticagrelor) were withheld for a minimum of 24 hours and a maximum of 72 hours before surgery. If local practice was to perform surgery without waiting for dissipation of antiplatelet effects capsules and tablets were withheld 24 hours prior to surgery and use of aprotinin or other haemostatic agents was allowed. If local practice was to use IPA monitoring to determine when surgery could be performed both the capsules and tablets were withheld at the same time and the usual monitoring procedures followed. T Ticagrelor; C Clopidogrel. Table - 2 CABG-related bleeding (PLATO) Ticagrelor* N=770 Clopidogrel N=814 n (%) patients with event n (%) patients with event PLATO Total Major 626 (81.3) 666 (81.8) Fatal/Life-threatening 337 (43.8) 350 (43.0) Fatal 6 (0.8) 7 (0.9) PLATO Major bleed: any one of the following: fatal; intracranial; intrapericardial with cardiac tamponade; hypovolemic shock or severe hypotension requiring intervention; significantly disabling (e.g., intraocular with permanent vision loss); associated with a decrease in Hb of at least 3 grams/dL (or a fall in hematocrit (Hct) of at least 9%); transfusion of 2 or more units. PLATO Major bleed, fatal/life-threatening: any major bleed as described above and associated with a decrease in Hb of more than 5 grams/dL (or a fall in hematocrit (Hct) of at least 15%); transfusion of 4 or more units. * 90 mg BID When antiplatelet therapy was stopped 5 days before CABG, major bleeding occurred in 75% of ticagrelor treated patients and 79% on clopidogrel. Other Adverse Reactions in PLATO Adverse reactions that occurred at a rate of 4% or more in PLATO are shown in Table 3. Table 3 – Percentage of patients reporting non-hemorrhagic adverse reactions at least 4% or more in either group and more frequently on ticagrelor (PLATO) Ticagrelor* N=9235 Clopidogrel N=9186 Dyspnea 13.8 7.8 Dizziness 4.5 3.9 Nausea 4.3 3.8 * 90 mg BID Bleeding in PEGASUS (Secondary Prevention in Patients with a History of Myocardial Infarction) Overall outcome of bleeding events in the PEGASUS study are shown in Table 4. Table 4 – Bleeding events (PEGASUS) Ticagrelor* N=6958 Placebo N=6996 Events / 1,000 patient years Events / 1,000 patient years TIMI Major 8 3 Fatal 1 1 Intracranial hemorrhage 2 1 TIMI Major or Minor 11 2 TIMI Major: Fatal bleeding, OR any intracranial bleeding, OR clinically overt signs of hemorrhage associated with a drop in hemoglobin (Hgb) of ≥5 grams/dL, or a fall in hematocrit (Hct) of ≥15%. Fatal: A bleeding event that directly led to death within 7 days. TIMI Minor: Clinically apparent with 3 to 5 grams/dL decrease in hemoglobin. * 60 mg BID The bleeding profile of ticagrelor 60 mg compared to aspirin alone was consistent across multiple pre-defined subgroups (e.g., by age, gender, weight, race, geographic region, concurrent conditions, concomitant therapy, stent, and medical history) for TIMI Major and TIMI Major or Minor bleeding events. Other Adverse Reactions in PEGASUS Adverse reactions that occurred in PEGASUS at rates of 3% or more are shown in Table 5. Table 5 – Non-hemorrhagic adverse reactions reported in >3% of patients in the ticagrelor 60 mg treatment group (PEGASUS) Ticagrelor* N=6958 Placebo N=6996 Dyspnea 14.2% 5.5% Dizziness 4.5% 4.1% Diarrhea 3.3% 2.5% * 60 mg BID Bleeding in THEMIS (Prevention of major CV events in patients with CAD and Type 2 Diabetes Mellitus) The Kaplan-Meier curve of time to first TIMI Major bleeding event is presented in Figure 3. Figure 3 - Time to first TIMI Major bleeding event (THEMIS) T= Ticagrelor; P = Placebo; N = Number of patients The bleeding events in THEMIS are shown below in Table 6. Table 6 – Bleeding events (THEMIS) Ticagrelor N=9562 Placebo N=9532 Events / 1,000 patient years Events / 1,000 patient years TIMI Major 9 4 TIMI Major or Minor 12 5 TIMI Major or Minor or Requiring medical attention 46 18 Fatal bleeding 1 0 Intracranial hemorrhage 3 2 Bleeding in THALES (Reduction in risk of stroke in patients with acute ischemic stroke or TIA) The Kaplan-Meier curve of time course of GUSTO severe bleeding events is presented in Figure 4. Figure 4 -Time course of GUSTO severe bleeding events KM%: Kaplan-Meier percentage evaluated at Day 30; T = Ticagrelor; P = placebo; N = Number of patients GUSTO Severe : Any one of the following: fatal bleeding, intracranial bleeding (excluding asymptomatic hemorrhagic transformations of ischemic brain infarctions and excluding microhemorrhages < 10 mm evident only on gradient-echo magnetic resonance imaging), bleeding that caused hemodynamic compromise requiring intervention (eg, systolic blood pressure <90 mmg Hg that required blood or fluid replacement, or vasopressor/inotropic support, or surgical intervention). Intracranial bleeding and fatal bleeding in THALES: In total, there were 21 intracranial hemorrhages (ICHs) for ticagrelor and 6 ICHs for placebo. Fatal bleedings, almost all ICH, occurred in 11 for ticagrelor and in 2 for placebo. Bradycardia In a Holter substudy of about 3,000 patients in PLATO, more patients had ventricular pauses with ticagrelor (6%) than with clopidogrel (3.5%) in the acute phase; rates were 2.2% and 1.6%, respectively, after 1 month. PLATO, PEGASUS, THEMIS and THALES excluded patients at increased risk of bradycardic events (e.g., patients who have sick sinus syndrome, 2 nd or 3 rd degree AV block, or bradycardic-related syncope and not protected with a pacemaker). Lab abnormalities Serum Uric Acid: In PLATO, serum uric acid levels increased approximately 0.6 mg/dL from baseline on ticagrelor 90 mg and approximately 0.2 mg/dL on clopidogrel. The difference disappeared within 30 days of discontinuing treatment. Reports of gout did not differ between treatment groups in PLATO (0.6% in each group). In PEGASUS, serum uric acid levels increased approximately 0.2 mg/dL from baseline on ticagrelor 60 mg and no elevation was observed on aspirin alone. Gout occurred more commonly in patients on ticagrelor than in patients on aspirin alone (1.5%,1.1%). Mean serum uric acid concentrations decreased after treatment was stopped. Serum Creatinine: In PLATO, a >50% increase in serum creatinine levels was observed in 7.4% of patients receiving ticagrelor 90 mg compared to 5.9% of patients receiving clopidogrel. The increases typically did not progress with ongoing treatment and often decreased with continued therapy. Evidence of reversibility upon discontinuation was observed even in those with the greatest on treatment increases. Treatment groups in PLATO did not differ for renal-related serious adverse events such as acute renal failure, chronic renal failure, toxic nephropathy, or oliguria. In PEGASUS, serum creatinine concentration increased by >50% in approximately 4% of patients receiving ticagrelor 60 mg, similar to aspirin alone. The frequency of renal related adverse events was similar for ticagrelor and aspirin alone regardless of age and baseline renal function. 6.2 Postmarketing Experience The following adverse reactions have been identified during post-approval use of ticagrelor. Because these reactions are reported voluntarily from a population of an unknown size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. Blood and lymphatic system disorders: Thrombotic Thrombocytopenic Purpura (TTP) has been rarely reported with the use of ticagrelor. TTP is a serious condition which can occur after a brief exposure (<2 weeks) and requires prompt treatment. Immune system disorders : Hypersensitivity reactions including angioedema [see Contraindications (4.3) ] . Respiratory Disorders: Central sleep apnea, Cheyne-Stokes respiration Skin and subcutaneous tissue disorders : Rash
Warnings & Cautions for Ticagrelor
- Dyspnea was reported more frequently with ticagrelor than with control agents in clinical trials. Dyspnea from ticagrelor is self-limiting. ( 5.3 )
- Severe Hepatic Impairment: Likely increase in exposure to ticagrelor. ( 5.5 )
- Laboratory Test Interference: False negative platelet functional test results have been reported for Heparin Induced Thrombocytopenia (HIT). Ticagrelor is not expected to impact PF4 antibody testing for HIT. ( 5.7 ) 5.1 Risk of Bleeding Drugs that inhibit platelet function including ticagrelor increase the risk of bleeding [see Warnings and Precautions ( 5.2 ) and Adverse Reactions ( 6.1 )]. Patients treated for acute ischemic stroke or TIA Patients at NIHSS >5 and patients receiving thrombolysis were excluded from THALES and use of ticagrelor tablets in such patients is not recommended. 5.2 Discontinuation of Ticagrelor Tablets in Patients Treated for Coronary Artery Disease Discontinuation of ticagrelor tablets will increase the risk of myocardial infarction, stroke, and death in patients being treated for coronary artery disease. If ticagrelor tablets must be temporarily discontinued (e.g., to treat bleeding or for significant surgery), restart it as soon as possible. When possible, interrupt therapy with ticagrelor tablets for five days prior to surgery that has a major risk of bleeding. Resume ticagrelor tablets as soon as hemostasis is achieved. 5.3 Dyspnea In clinical trials, about 14% (PLATO and PEGASUS) to 21% (THEMIS) of patients treated with ticagrelor developed dyspnea. Dyspnea was usually mild to moderate in intensity and often resolved during continued treatment but led to study drug discontinuation in 1.0% (THALES), 4.3% (PEGASUS), and 6.9% (THEMIS) of patients. In a substudy of PLATO, 199 subjects underwent pulmonary function testing irrespective of whether they reported dyspnea. There was no indication of an adverse effect on pulmonary function assessed after one month or after at least 6 months of chronic treatment. If a patient develops new, prolonged, or worsened dyspnea that is determined to be related to ticagrelor tablets, no specific treatment is required; continue ticagrelor tablets without interruption if possible. In the case of intolerable dyspnea requiring discontinuation of ticagrelor tablets, consider prescribing another antiplatelet agent. 5.4 Bradyarrhythmias Ticagrelor tablets can cause ventricular pauses [see Adverse Reactions (6.1) ] . Bradyarrhythmias including AV block have been reported in the postmarketing setting. Patients with a history of sick sinus syndrome, 2 nd or 3 rd degree AV block or bradycardia-related syncope not protected by a pacemaker were excluded from clinical studies and may be at increased risk of developing bradyarrhythmias with ticagrelor. 5.5 Severe Hepatic Impairment Avoid use of ticagrelor tablets in patients with severe hepatic impairment. Severe hepatic impairment is likely to increase serum concentration of ticagrelor. There are no studies of ticagrelor patients with severe hepatic impairment [see Clinical Pharmacology ( 12.3 )]. 5.6 Central Sleep Apnea Central sleep apnea (CSA) including Cheyne-Stokes respiration (CSR) has been reported in the post-marketing setting in patients taking ticagrelor, including recurrence or worsening of CSA/CSR following rechallenge. If central sleep apnea is suspected, consider further clinical assessment. 5.7 Laboratory Test Interferences False negative functional tests for Heparin Induced Thrombocytopenia (HIT) Ticagrelor has been reported to cause false negative results in platelet functional tests (including the heparin-induced platelet aggregation (HIPA) assay) for patients with Heparin Induced Thrombocytopenia (HIT). This is related to inhibition of the P2Y 12 -receptor on the healthy donor platelets in the test by ticagrelor in the affected patient’s serum/plasma. Information on concomitant treatment with ticagrelor is required for interpretation of HIT functional tests. Based on the mechanism of ticagrelor interference, ticagrelor is not expected to impact PF4 antibody testing for HIT.
Drug Interactions with Ticagrelor
- Avoid use with strong CYP3A inhibitors or CYP3A inducers. ( 7.1 , 7.2 )
- Opioids: Decreased exposure to ticagrelor. Consider use of parenteral anti-platelet agent. ( 7.3)
- Patients receiving more than 40 mg per day of simvastatin or lovastatin may be at increased risk of statin-related adverse effects. ( 7.4 )
- Rosuvastatin plasma concentrations may increase. Monitor for statin-related adverse effects. ( 7.4 )
- Monitor digoxin levels with initiation of or any change in ticagrelor. ( 7.5 ) 7.1 Strong CYP3A Inhibitors Strong CYP3A inhibitors substantially increase ticagrelor exposure and so increase the risk of dyspnea, bleeding, and other adverse events. Avoid use of strong inhibitors of CYP3A (e.g., ketoconazole, itraconazole, voriconazole, clarithromycin, nefazodone, ritonavir, saquinavir, nelfinavir, indinavir, atazanavir and telithromycin) [see Clinical Pharmacology ( 12.3 )] . 7.2 Strong CYP3A Inducers Strong CYP3A inducers substantially reduce ticagrelor exposure and so decrease the efficacy of ticagrelor. Avoid use with strong inducers of CYP3A (e.g., rifampin, phenytoin, carbamazepine and phenobarbital) [see Clinical Pharmacology ( 12.3) ]. 7.3 Opioids As with other oral P2Y 12 inhibitors, co-administration of opioid agonists delay and reduce the absorption of ticagrelor and its active metabolite presumably because of slowed gastric emptying [see Clinical Pharmacology (12.3)]. Consider the use of a parenteral anti-platelet agent in acute coronary syndrome patients requiring co-administration of morphine or other opioid agonists. 7.4 Simvastatin, Lovastatin , Rosuvastatin Ticagrelor increases serum concentrations of simvastatin and lovastatin because these drugs are metabolized by CYP3A4. Avoid simvastatin and lovastatin doses greater than 40 mg [see Clinical Pharmacology ( 12.3 )]. Ticagrelor increases serum concentration of rosuvastatin because rosuvastatin is a BCRP substrate [see Clinical Pharmacology ( 12.3 )]. 7.5 Digoxin Ticagrelor inhibits the P-glycoprotein transporter; monitor digoxin levels with initiation of or any change in ticagrelor therapy [see Clinical Pharmacology ( 12.3 )].
Pregnancy Safety for Ticagrelor
Pregnancy Risk Summary Available data from case reports with ticagrelor use in pregnant women have not identified a drug-associated risk of major birth defects, miscarriage, or adverse maternal or fetal outcomes. Ticagrelor given to pregnant rats and pregnant rabbits during organogenesis caused structural abnormalities in the offspring at maternal doses about 5 to 7 times the maximum recommended human dose (MRHD) based on body surface area. When ticagrelor was given to rats during late gestation and lactation, pup death and effects on pup growth were seen at approximately 10 times the MRHD ( see Data ). The estimated background risk of major birth defects and miscarriage for the indicated population is unknown.
All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2 to 4% and 15 to 20%, respectively. Data Animal Data In reproductive toxicology studies, pregnant rats received ticagrelor during organogenesis at doses from 20 to 300 mg/kg/day. 20 mg/kg/day is approximately the same as the MRHD of 90 mg twice daily for a 60 kg human on a mg/m 2 basis.
Adverse outcomes in offspring occurred at doses of 300 mg/kg/day (16.5 times the MRHD on a mg/m 2 basis) and included supernumerary liver lobe and ribs, incomplete ossification of sternebrae, displaced articulation of pelvis, and misshapen/misaligned sternebrae. At the mid-dose of 100 mg/kg/day (5.5 times the MRHD on a mg/m 2 basis), delayed development of liver and skeleton was seen.When pregnant rabbits received ticagrelor during organogenesis at doses from 21 to 63 mg/kg/day, fetuses exposed to the highest maternal dose of 63 mg/kg/day (6.8 times the MRHD on a mg/m 2 basis) had delayed gall bladder development and incomplete ossification of the hyoid, pubis and sternebrae occurred. In a prenatal/postnatal study, pregnant rats received ticagrelor at doses of 10 to 180 mg/kg/day during late gestation and lactation.
Pup death and effects on pup growth were observed at 180 mg/kg/day (approximately 10 times the MRHD on a mg/m 2 basis). Relatively minor effects such as delays in pinna unfolding and eye opening occurred at doses of 10 and 60 mg/kg (approximately one-half and 3.2 times the MRHD on a mg/m 2 basis).
Pediatric Use of Ticagrelor
Pediatric Use The safety and effectiveness of ticagrelor tablets have not been established in pediatric patients. Pediatric use information describing a clinical study in which efficacy was not demonstrated is approved for AstraZeneca Pharmaceuticals LP’s BRILINTA® (ticagrelor) tablets. However, due to AstraZeneca Pharmaceuticals LP’s marketing exclusivity rights, this drug product is not labeled with that information.
Contraindications for Ticagrelor
- History of intracranial hemorrhage. ( 4.1 )
- Active pathological bleeding. ( 4.2 )
- Hypersensitivity to ticagrelor or any component of the product. ( 4.3 ) 4.1 History of Intracranial Hemorrhage Ticagrelor tablets are contraindicated in patients with a history of intracranial hemorrhage (ICH) because of a high risk of recurrent ICH in this population [see Clinical Studies ( 14.1 ) ,( 14.2 )]. 4.2 Active Bleeding Ticagrelor tablets are contraindicated in patients with active pathological bleeding such as peptic ulcer or intracranial hemorrhage [see Warnings and Precautions ( 5.1 ) and Adverse Reactions (6.1 )]. 4.3 Hypersensitivity Ticagrelor tablets are contraindicated in patients with hypersensitivity (e.g., angioedema) to ticagrelor or any component of the product.
Overdosage Information for Ticagrelor
There is currently no known treatment to reverse the effects of ticagrelor tablets, and ticagrelor is not dialyzable. Treatment of overdose should follow local standard medical practice. Bleeding is the expected pharmacologic effect of overdosing.
If bleeding occurs, appropriate supportive measures should be taken. Platelet transfusion did not reverse the antiplatelet effect of ticagrelor tablets in healthy volunteers and is unlikely to be of clinical benefit in patients with bleeding. Other effects of overdose may include gastrointestinal effects (nausea, vomiting, diarrhea) or ventricular pauses.
Monitor the ECG.
Clinical Studies of Ticagrelor
Acute Coronary Syndromes and Secondary Prevention after Myocardial Infarction
PLATO PLATO (NCT00391872) was a randomized double-blind study comparing ticagrelor (N=9333) to clopidogrel (N=9291), both given in combination with aspirin and other standard therapy, in patients with acute coronary syndromes (ACS), who presented within 24 hours of onset of the most recent episode of chest pain or symptoms. The study’s primary endpoint was the composite of first occurrence of cardiovascular death, non-fatal MI (excluding silent MI), or non-fatal stroke. Patients who had already been treated with clopidogrel could be enrolled and randomized to either study treatment.
Patients with previous intracranial hemorrhage, gastrointestinal bleeding within the past 6 months, or with known bleeding diathesis or coagulation disorder were excluded. Patients taking anticoagulants were excluded from participating and patients who developed an indication for anticoagulation during the trial were discontinued from study drug. Patients could be included whether there was intent to manage the ACS medically or invasively, but patient randomization was not stratified by this intent.
All patients randomized to ticagrelor received a loading dose of 180 mg followed by a maintenance dose of 90 mg twice daily. Patients in the clopidogrel arm were treated with an initial loading dose of clopidogrel 300 mg, if clopidogrel therapy had not already been given. Patients undergoing PCI could receive an additional 300 mg of clopidogrel at investigator discretion.
A daily maintenance dose of aspirin 75 to 100 mg was recommended, but higher maintenance doses of aspirin were allowed according to local judgment. Patients were treated for at least 6 months and for up to 12 months. PLATO patients were predominantly male (72%) and Caucasian (92%). About 43% of patients were >65 years and 15% were >75 years.
Median exposure to study drug was 276 days. About half of the patients received pre-study clopidogrel and about 99% of the patients received aspirin at some time during PLATO. About 35% of patients were receiving a statin at baseline and 93% received a statin sometime during PLATO. Table 7 shows the study results for the primary composite endpoint and the contribution of each component to the primary endpoint. Separate secondary endpoint analyses are shown for the overall occurrence of CV death, MI, and stroke and overall mortality.
Table 7 - Patients with outcome events (PLATO) Ticagrelor* N=9333 Clopidogrel N=9291 Hazard Ratio (95% CI) p-value Events / 1,000 patient years Events / 1,000 patient years Composite of CV death, MI, or stroke 111 131 0.84 0.0003 CV death 32 43 0.74 Non-fatal MI 64 76 0.84 Non-fatal stroke 15 12 1.24 Secondary endpoints † CV death 45 57 0.79 0.0013 MI ‡ 65 76 0.84 0.0045 Stroke ‡ 16 14 1.17 0.22 All-cause mortality 51 65 0.78 0.0003 * Dosed at 90 mg bid. † Note: rates of first events for the components CV Death, MI and Stroke are the actual rates for first events for each component and do not add up to the overall rate of events in the composite endpoint. ‡ Including patients who could have had other non-fatal events or died The Kaplan-Meier curve (Figure 10) shows time to first occurrence of the primary composite endpoint of CV death, non-fatal MI or non-fatal stroke in the overall study. Figure 10 - Time to first occurrence of CV death, MI, or stroke in (PLATO) The curves separate by 30 days and continue to diverge throughout the 12-month treatment period (RRR 16%). Among 11,289 patients with PCI receiving any stent during PLATO, there was a lower risk of stent thrombosis (1.3% for adjudicated “definite”) than with clopidogrel (1.9%) (HR 0.67, 95% CI 0.50 to 0.91; p=0.009). The results were similar for drug-eluting and bare metal stents. A wide range of demographic, concurrent baseline medications, and other treatment differences were examined for their influence on outcome.
Some of these are shown in Figure 11. Such analyses must be interpreted cautiously, as differences can reflect the play of chance among a large number of analyses. Most of the analyses show effects consistent with the overall results, but there are two exceptions: a finding of heterogeneity by region and a strong influence of the maintenance dose of aspirin. These are considered further below.
Most of the characteristics shown are baseline characteristics, but some reflect post-randomization determinations (e.g., aspirin maintenance dose, use of PCI). Figure 11 - Subgroup analyses of (PLATO) Note: The figure above presents effects in various subgroups most of which are baseline characteristics and most of which were pre-specified. The 95% confidence limits that are shown do not take into account how many comparisons were made, nor do they reflect the effect of a particular factor after adjustment for all other factors. Apparent homogeneity or heterogeneity among groups should not be over-interpreted.
Regional Differences Results in the rest of the world compared to effects in North America (U.S. and Canada) show a smaller effect in North America, numerically inferior to the control and driven by the U.S. subset. The statistical test for the U.S./non-U.S. comparison is statistically significant ( p =0.009), and the same trend is present for both CV death and non-fatal MI. The individual results and nominal p -values, like all subset analyses, need cautious interpretation, and they could represent chance findings. The consistency of the differences in both the CV mortality and non-fatal MI components, however, supports the possibility that the finding is reliable.
A wide variety of baseline and procedural differences between the U.S. and non-U.S. (including intended invasive vs. planned medical management, use of GPIIb/IIIa inhibitors, use of drug eluting vs. bare-metal stents) were examined to see if they could account for regional differences, but with one exception, aspirin maintenance dose, these differences did not appear to lead to differences in outcome. Aspirin Dose The PLATO protocol left the choice of aspirin maintenance dose up to the investigator and use patterns were different in U.S. sites from sites outside of the U.S. About 8% of non-U.S. investigators administered aspirin doses above 100 mg, and about 2% administered doses above 300 mg. In the U.S., 57% of patients received doses above 100 mg and 54% received doses above 300 mg.
Overall results favored ticagrelor when used with low maintenance doses (≤100 mg) of aspirin, and results analyzed by aspirin dose were similar in the U.S. and elsewhere. Figure 10 shows overall results by median aspirin dose. Figure 12 shows results by region and dose.
Figure 12 - CV death, MI, stroke by maintenance aspirin dose in the U.S. and outside the U.S. (PLATO) Like any unplanned subset analysis, especially one where the characteristic is not a true baseline characteristic (but may be determined by usual investigator practice), the above analyses must be treated with caution. It is notable, however, that aspirin dose predicts outcome in both regions with a similar pattern, and that the pattern is similar for the two major components of the primary endpoint, CV death and non-fatal MI. Despite the need to treat such results cautiously, there appears to be good reason to restrict aspirin maintenance dosage accompanying ticagrelor to 100 mg. Higher doses do not have an established benefit in the ACS setting, and there is a strong suggestion that use of such doses reduces the effectiveness of ticagrelor.
PEGASUS The PEGASUS TIMI-54 study (NCT01225562) was a 21,162-patient, randomized, double-blind, placebo-controlled, parallel-group study. Two doses of ticagrelor, either 90 mg twice daily or 60 mg twice daily, co-administered with 75 to 150 mg of aspirin, were compared to aspirin therapy alone in patients with history of MI. The primary endpoint was the composite of first occurrence of CV death, non-fatal MI and non-fatal stroke. CV death and all-cause mortality were assessed as secondary endpoints.
Patients were eligible to participate if they were ≥50 years old, with a history of MI 1 to 3 years prior to randomization, and had at least one of the following risk factors for thrombotic cardiovascular events: age ≥65 years, diabetes mellitus requiring medication, at least one other prior MI, evidence of multivessel coronary artery disease, or creatinine clearance <60 mL/min. Patients could be randomized regardless of their prior ADP receptor blocker therapy or a lapse in therapy. Patients requiring or who were expected to require renal dialysis during the study were excluded.
Patients with any previous intracranial hemorrhage, gastrointestinal bleeding within the past 6 months, or with known bleeding diathesis or coagulation disorder were excluded. Patients taking anticoagulants were excluded from participating and patients who developed an indication for anticoagulation during the trial were discontinued from study drug. A small number of patients with a history of stroke were included.
Based on information external to PEGASUS, 102 patients with a history of stroke (90 of whom received study drug) were terminated early and no further such patients were enrolled. Patients were treated for at least 12 months and up to 48 months with a median follow up time of 33 months. Patients were predominantly male (76%) Caucasian (87%) with a mean age of 65 years, and 99.8% of patients received prior aspirin therapy.
The Kaplan-Meier curve (Figure 13) shows time to first occurrence of the primary composite endpoint of CV death, nonfatal MI or non-fatal stroke. F igure 13 – Time to First Occurrence of CV death, MI or Stroke (PEGASUS) Ti = Ticagrelor BID, CI = Confidence interval; HR = Hazard ratio; KM = Kaplan-Meier; N = Number of patients. Both the 60 mg and 90 mg regimens of ticagrelor in combination with aspirin were superior to aspirin alone in reducing the incidence of CV death, MI or stroke.
The absolute risk reductions for ticagrelor plus aspirin vs. aspirin alone were 1.27% and 1.19% for the 60 and 90 mg regimens, respectively. Although the efficacy profiles of the two regimens were similar, the lower dose had lower risks of bleeding and dyspnea. Table 8 shows the results for the 60 mg plus aspirin regimen vs. aspirin alone.
Table 8 – Incidences of the primary composite endpoint, primary composite endpoint components, and secondary endpoints (PEGASUS) Ticagrelor * N=7045 Placebo N=7067 HR (95% CI) p -value Events / 1,000 patient years Events / 1,000 patient years Time to first CV death, MI, or stroke † 26 31 0.84 0.0043 CV Death ‡,§ 9 11 0.83 Myocardial infarction § 15 18 0.84 Stroke § 5 7 0.75 All-cause mortality ‡ 16 18 0.89 CI = Confidence interval; CV = Cardiovascular; HR = Hazard ratio; MI = Myocardial infarction; N = Number of patients. *60 mg BID † Primary composite endpoint ‡ Secondary endpoints § The event rate for the components CV death, MI and stroke are calculated from the actual number of first events for each component. In PEGASUS, the relative risk reduction (RRR) for the composite endpoint from 1 to 360 days (17% RRR) and from 361 days and onwards (16% RRR) were similar. The treatment effect of ticagrelor 60 mg over aspirin appeared similar across most pre-defined subgroups, see Figure 14. Figure Figure14 – Subgroup analyses of ticagrelor 60 mg (PEGASUS ) Note: The figure above presents effects in various subgroups all of which are baseline characteristics and most of which were pre-specified.
The 95% confidence limits that are shown do not take into account how many comparisons were made, nor do they reflect the effect of a particular factor after adjustment for all other factors. Apparent homogeneity or heterogeneity among groups should not be over-interpreted.
Coronary Artery Disease but No
Prior Stroke or Myocardial Infarction THEMIS The THEMIS study (NCT01991795) was a double-blind, parallel group, study in which 19,220 patients with CAD and Type 2 Diabetes Mellitus (T2DM) but no history of MI or stroke were randomized to twice daily ticagrelor or placebo, on a background of 75 to 150 mg of aspirin. The primary endpoint was the composite of first occurrence of CV death, MI, and stroke. CV death, MI, ischemic stroke, and all-cause death were assessed as secondary endpoints.
Patients were eligible to participate if they were ≥ 50 years old with CAD, defined as a history of PCI or CABG, or angiographic evidence of ≥ 50% lumen stenosis of at least 1 coronary artery and T2DM treated for at least 6 months with glucose-lowering medication. Patients with previous intracerebral hemorrhage, gastrointestinal bleeding within the past 6 months, known bleeding diathesis, and coagulation disorder were excluded. Patients taking anticoagulants or ADP receptor antagonists were excluded from participating, and patients who developed an indication for those medications during the trial were discontinued from study drug.
Patients were treated for a median of 33 months and up to 58 months. Patients were predominantly male (69%) with a mean age of 66 years. At baseline, 80% had a history of coronary artery revascularization; 58% had undergone PCI, 29% had undergone a CABG and 7% had undergone both.
The proportion of patients studied in the U.S. was 12%. Patients in THEMIS had established CAD and other risk factors that put them at higher cardiovascular risk. Ticagrelor was superior to placebo in reducing the incidence of CV death, MI, or stroke. The effect on the composite endpoint was driven by the individual components MI and stroke; see Table 9. Table 9 – Primary composite endpoint, primary endpoint components, and secondary endpoints (THEMIS) Ticagrelor N=9619 Placebo N=9601 HR (95% CI) p -value Events / 1,000 patient years Events / 1,000 patient years Time to first CV death, MI, or stroke * 24 27 0.90 0.04 CV death † 12 11 1.02 Myocardial infarction † 9 11 0.84 Stroke † 6 7 0.82 Secondary endpoints CV death 12 11 1.02 Myocardial infarction 9 11 0.84 Ischemic stroke 5 6 0.80 All-cause death 18 19 0.98 CI = Confidence interval; CV = Cardiovascular; HR = Hazard ratio; MI = Myocardial infarction. * Primary endpoint † The event rate for the components CV death, MI and stroke are calculated from the actual number of first events for each component.
The Kaplan-Meier curve (Figure 15) shows time to first occurrence of the primary composite endpoint of CV death, MI, or stroke. Figure 15 -Time to First Occurrence of CV death, MI or Stroke (THEMIS) T = Ticagrelor; P = Placebo; N = Number of patients. The treatment effect of ticagrelor appeared similar across patient subgroups, see Figure 16. Figure 16 –Subgroup analyses of ticagrelor (THEMIS) Note: The figure above presents effects in various subgroups all of which are baseline characteristics.
The 95% confidence limits that are shown do not take into account how many comparisons were made, nor do they reflect the effect of a particular factor after adjustment for all other factors. Apparent homogeneity or heterogeneity among groups should not be over-interpreted.
Acute Ischemic Stroke or Transient Ischemic Attack (TIA)
THALES The THALES study (NCT03354429) was a 11,016-patient, randomized, double-blind, parallel-group study of ticagrelor 90 mg twice daily versus placebo in patients with acute ischemic stroke or transient ischemic attack (TIA). The primary endpoint was the first occurrence of the composite of stroke and death up to 30 days. Ischemic stroke was assessed as one of the secondary endpoints. Patients were eligible to participate if they were ≥40 years old, with non-cardioembolic acute ischemic stroke (NIHSS score ≤5) or high-risk TIA (defined as ABCD 2 score ≥6 or ipsilateral atherosclerotic stenosis ≥50% in the internal carotid or an intracranial artery). Patients who received thrombolysis or thrombectomy within 24 hours prior to randomization were not eligible.
Patients were randomized within 24 hours of onset of an acute ischemic stroke or TIA to receive 30 days of either ticagrelor (90 mg twice daily, with an initial loading dose of 180 mg) or placebo, on a background of aspirin initially 300 to 325 mg then 75 to 100 mg daily. The median treatment duration was 31 days. Ticagrelor was superior to placebo in reducing the rate of the primary endpoint (composite of stroke and death), corresponding to a relative risk reduction (RRR) of 17% and an absolute risk reduction (ARR) of 1.1% (Table 10). The effect was driven primarily by a significant reduction in the stroke component of the primary endpoint (19% RRR, 1.1% ARR). Table 10 -Incidences of the primary composite endpoint, primary composite endpoint components, and secondary endpoint (THALES) Ticagrelor N=5523 Placebo N=5493 HR (95% CI) p -value n (patients with event) KM% n (patients with event) KM% Time to first Stroke or Death 303 5.4% 362 6.5% 0.83 0.015 Time to first Stroke* 284 5.1% 347 6.3% 0.81 Time to Death* 36 0.6% 27 0.5% 1.33 Secondary Endpoint Time to first Ischemic Stroke 276 5.0% 345 6.2% 0.79 0.004 CI = Confidence interval; HR = Hazard ratio; KM = Kaplan-Meier percentage calculated at 30 days; N = Number of patients * The number of patients with the event of interest.
In the time to first stroke, patients who died are censored at the time of death. The Kaplan-Meier curve (Figure 17) shows the time to first occurrence of the primary composite endpoint of stroke and death. Figure 17 – Time to First Occurrence of Stroke or Death (THALES) KM%: Kaplan-Meier percentage evaluated at Day 30; T=Ticagrelor; P=placebo; N=Number of patients Ticagrelor’s treatment effect on stroke and on death accrued over the first 10 days and was sustained at 30 days.
Although not studied, this suggests that shorter treatment could result in similar benefit and reduced bleeding risk. The treatment effect of ticagrelor was generally consistent across pre-defined subgroups (Figure 18). Figure 18 – Subgroup analyses of ticagrelor 90 mg (THALES) Note: The figure above presents effects in various subgroups all of which are baseline characteristics and were pre-specified. The 95% confidence limits that are shown do not take into account how many comparisons were made, nor do they reflect the effect of a particular factor after adjustment for all other factors.
Apparent homogeneity or heterogeneity among groups should not be over-interpreted. At Day 30, there was an absolute reduction of 1.2% (95% CI: -2.1%, -0.3%) in the incidence of non-hemorrhagic stroke and death (excluding fatal bleed) favoring ticagrelor (294 events: 5.3%) over placebo (359 events: 6.5%) in the intention-to-treat population. In the same population, there was an absolute increase of 0.4% (95% CI: 0.2%, 0.6%) in the incidence of GUSTO severe bleeding unfavorable to ticagrelor arm (28 events: 0.5%) compared to the placebo arm (7 events: 0.1%).
Drug information sourced from the FDA. This content is for informational purposes only and does not constitute medical advice. Consult a healthcare professional before making any medication decisions.
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