Apixaban

The safety will be assessed by means of the incidence of major and clinically relevant, non-major bleeding as well as specific bleedings in dialysis patients (e.g., after shunt removal) on anticoagulation.

The number of participants with non-fatal deep vein thromboses (DVT) (including asymptomatic and symptomatic), pulmonary embolism (PE), cerebral venous sinus thrombosis (CVST); and venous thromboembolism (VTE) related-death objectively confirmed by a blinded, independent adjudication committee. Symptomatic events are included during the intended treatment period. Asymptomatic events are included from scans up to Day 40.

The number of participants with major bleeding adjudicated by a blinded, independent adjudication committee. Adjudicated major bleeding is defined as bleeding that satisfies one or more of the following criteria: 1. fatal bleeding 2. clinically overt bleeding associated with a decrease in hemoglobin of at least 20g/L (ie, 2g/dL) in a 24-hour period 3. bleeding that is retroperitoneal, pulmonary, intracranial, or otherwise involves the CNS; and/or 4. bleeding that requires surgical intervention in an operating suite, including interventional radiology.

Defined as: 1. Hematoma requiring re-operation \- Defined as a hematoma that continues to expand despite all appropriate non-operative measures, or is producing impending or actual wound breakdown or skin necrosis. Minor hematomas that are evacuated at the time of other re-operation (eg. for lead repositioning) are not considered as a primary outcome. or 2. Hematoma resulting in prolongation of hospitalization \- Defined as extended hospitalization or rehospitalization for \> 24 hours, post index surgery, primarily due to hematoma. or 3. Hematoma requiring interruption of anti-coagulation. - Defined as reversal or intentional withholding of all anticoagulation for \> or = 24 hours, in response to wound hematoma.

VTE: nonfatal deep vein thrombosis (DVT) or nonfatal pulmonary embolism (PE). All events were adjudicated by an ICAC blinded to treatment. DVT assessed by compression ultrasound and/or venography; PE assessed by spiral computed tomography scanning, pulmonary angiography, and/or ventilation/perfusion lung scan. Event rate (proportion of participants): n/N (n=number of participants with observation; N=total number of efficacy evaluable participants). Intended treatment period: longer of the dosing period plus 2 days (completed treatment) or 355 days (discontinued early). Composite endpoint: events at any time from randomization until end of intended treatment, regardless whether drug treatment was received. All randomized participants with a non-missing primary endpoint were summarized. Missing endpoint = outcomes which could not be documented on or after study Day 154. Participants were categorized to the assigned group regardless of the treatment actually received (intent-to-treat).

VTE included: nonfatal deep vein thrombosis (DVT) or nonfatal pulmonary embolism (PE). All index events, DVT and/or PE were adjudicated/confirmed by a central independent adjudication committee blinded to treatment. DVT assessed by compression ultrasound and/or venography; PE assessed by spiral computed tomography scanning, pulmonary angiography, and/or ventilation/perfusion lung scan. Event rate (proportion of participants with event) calculated as n/N (n=number of events; N=number of participants). Intended treatment period: longer of the dosing period plus 2 days (completed treatment) or 355 days (discontinued early). Composite endpoint included events at any time from randomization until end of the intended treatment period, regardless whether drug treatment was received. For missing endpoint data, participants were imputed as having had a primary efficacy outcome event.

VTE included: nonfatal DVT or nonfatal PE. Event rate (proportion of participants with event) calculated as n/N (n=number of events; N=number of participants). Intended treatment period: longer of the dosing period plus 2 days (completed treatment) or 355 days (discontinued early). Composite endpoint included events at any time from randomization until end of the intended treatment period, regardless whether drug treatment was received. No imputation was done for these endpoints; participants who had an event during the intended treatment period were counted. Confidence interval (CI) for single event rate was calculated based on the Wald asymptotic confidence limits.

Event rate=percent of participants with an event divided by the total participants in the arm. Intended-treatment period=date of randomization to the efficacy cutoff date, which was to be the date on which at least 226 unrefuted original primary efficacy events occurred (date revised to May 28, 2010 following cessation of study for superior efficacy.)

VTE: nonfatal pulmonary embolism (PE), symptomatic deep vein thrombosis (DVT), or asymptomatic proximal DVT detected by ultrasound. VTE-related death: fatal PE or sudden death for which VTE could not be excluded as a cause. Intended Treatment Period=period that started on day of randomization: period ended (for treated) at latter of a) 2 days after last dose of study drug and b) 32 days after first dose of study drug; period ended (for not treated) 32 days after randomization. A bilateral compression ultrasound (CUS) was performed between Days 5 and 14 for detection of asymptomatic proximal DVT unless a symptomatic VTE was confirmed prior. CUS was also performed on Day 30 ± 2 except for those participants who had a confirmed symptomatic VTE or proximal asymptomatic DVT prior to that time. All efficacy events were adjudicated by the Independent Central Adjudication Committee (ICAC). Event rate (%): n/N\*100 (n=number with observation; N=total efficacy evaluable participants).

Major bleeding was adjudicated by an ICAC using criteria from the International Society on Thrombosis and Hemostasis (ISTH) and was defined as acute clinically overt bleeding: associated with a fall in hemoglobin of 2 grams per deciliter (g/dL) or more, or leading to a transfusion of 2 or more units of packed red blood cells or 1000 milliliters (mL) or more of whole blood, or bleeding in a critical site or bleeding which is fatal. Incidence determined by Event Rate (%): n/N\*100 (n=number with observation; N=total efficacy evaluable participants).

Bleeding was adjudicated by an ICAC using criteria from the ISTH. CRNM bleeding: acute clinically overt bleeding compromising hemodynamics; leading to hospitalization; traumatic subcutaneous hematoma; intramuscular hematoma; epistaxis that lasted for more than 5 minutes, was repetitive or led to an intervention; spontaneous gingival bleeding; spontaneous hematuria; macroscopic gastrointestinal hemorrhage (including at least 1 episode of melena or hematemesis, if clinically apparent with positive results on a fecal occult-blood test); rectal blood loss. Treatment Period=includes measurements or events with onset from first dose of study drug through 2 days after the last dose of study drugs for bleeding endpoints. Incidence determined by Event Rate (%): n/N\*100 (n=number with observation; N=total efficacy evaluable participants).

Bleeding was adjudicated by an ICAC using criteria from the ISTH. Major bleeding: acute clinically overt bleeding: associated with a fall in hemoglobin of 2 g/dL or more, or leading to a transfusion of 2 or more units of packed red blood cells or 1000 mL or more of whole blood, or bleeding in a critical site or bleeding which is fatal. CRNM bleeding: acute clinically overt bleeding compromising hemodynamics; leading to hospitalization; traumatic subcutaneous hematoma; intramuscular hematoma; epistaxis that lasted for more than 5 minutes, was repetitive or led to an intervention; spontaneous gingival bleeding; spontaneous hematuria; macroscopic gastrointestinal hemorrhage; rectal blood loss. Treatment Period=onset from first dose of study drug through 2 days after last dose of study drugs. Incidence: Event Rate (%): n/N\*100 (n=number with observation; N=total efficacy evaluable participants).

Bleeding was adjudicated by an ICAC using criteria from the ISTH. Treatment Period=includes measurements or events with onset from first dose of study drug through 2 days after the last dose of study drugs, for bleeding endpoints. Incidence determined by Event Rate (%): n/N\*100 (n=number with observation; N=total efficacy evaluable participants).

Event rate=Number of events divided by the number of patients evaluated. Intended treatment period starts on the day of randomization, and for those who received study drug, ends at the later of 2 days after last dose or 14 days after the first dose of study drug; for randomized patients who did not receive study drug, the period ends 14 days after randomization.Venous thromboembolic event (VTE)=nonfatal pulmonary embolism (PE), symptomatic deep vein thrombosis (DVT), or asymptomatic proximal DVT detected by ultrasound. VTE-related death=fatal PE or sudden death for which VTE could not be excluded as a cause.

Event rate=Number of events divided by the number of patients evaluated. A mandatory bilateral ascending contrast venogram was to be obtained on Day 35 (± 3). Patients with confirmed symptomatic DVT at any time, or asymptomatic DVT upon venography, were to receive treatment for DVT according to the investigator's standard of care. Signs and symptoms suggestive of VTE included, but were not limited to: 1) lower extremity DVT: erythema, warmth, pain, swelling, tenderness; and 2) PE: pleuritic chest pain, dyspnea, cough, hemoptysis, syncope, light-headedness/dizziness, tachypnea, and tachycardia. Intended Treatment Period started on day of randomization and, for patients who received treatment, ended at the later of 2 days after last dose of study drug or 38 days after the first dose (presurgery) of study drug. For randomized patients who did not receive study drug, the period ended 38 days after randomization.

All suspected efficacy events were adjudicated by the Central Events Committee (CEC). Diagnosis of stroke=the nontraumatic focal neurological deficit lasting at least 24 hours, and includes ischemic stroke, hemorrhagic stroke, ischemic stroke with hemorrhagic conversion, stroke of uncertain type, and retinal ischemic event (embolism, infarction). Diagnosis of SE=clinical history consistent with an acute loss of blood flow to a peripheral artery (or arteries), supported by evidence of embolism from surgical specimens, autopsy, angiography, vascular imaging, or other objective testing.

Rate=Number of adjudicated stroke or SE events per 100 patient years. Diagnosis of stroke=the nontraumatic focal neurological deficit lasting at least 24 hours, and includes ischemic stroke, hemorrhagic stroke, ischemic stroke with hemorrhagic conversion, stroke of uncertain type, and retinal ischemic event (embolism, infarction). Diagnosis of SE=clinical history consistent with an acute loss of blood flow to a peripheral artery (or arteries), supported by evidence of embolism from surgical specimens, autopsy, angiography, vascular imaging, or other objective testing.

An Independent Central Adjudication Committee (ICAC) adjudicated all venograms, suspected symptomatic deep vein thrombosis (DVT) and pulmonary embolism (PE), acute clinically overt bleeding events, suspected thrombocytopenia, suspected acute MI, suspected acute stroke, and cause of death. Event rate was number of participants with the composite endpoint divided by the number of participants analyzed and reported as percentage (%). Surgery=Day 1; Randomization/Treatment started on Day of Surgery or the next day (Day 1 or Day 2). A mandatory bilateral ascending contrast venogram was performed on all participants after 12 days (±2 days) of study treatment. Intended Treatment Period=starts on the day of randomization; for treated participants, the period ends at the latter of 2 days after last dose of study drug or 14 days after the first dose of study drug; for randomized participants who were not treated, the period ends 14 days after randomization.

ICAC adjudicated acute clinically overt bleeding events as per International Society on Thrombosis and Hemostasis (ISTH) guidelines modified for surgical patients. Event rate was number of participants with the composite endpoint divided by the number of participants analyzed (%). Clinically relevant (CR); Non-Major (N-M) Bleeding. Day 1=Day of surgery. Treatment started (first dose) day of surgery or next day. Treatment continued for 12 days.

ICAC adjudicated acute clinically overt bleeding events as per International Society on Thrombosis and Hemostasis (ISTH) guidelines modified for surgical patients. Event rate was number of participants with the composite endpoint divided by the number of participants analyzed (%). Follow up Period was from the end of the treatment period (last dose) up to 60 days post last dose, Day 72.

The number of participants with adjudicated major or CRNM bleeding events per the Perinatal and Paediatric Haemostasis Subcommittee of International Society on Thrombosis and Haemostasis (ISTH) criteria. Events are adjudicated by a blinded, independent events adjudication committee (EAC). Major bleeding satisfies one or more of the following criteria: fatal bleeding, clinically overt bleeding associated with a decrease in hemoglobin of at least 20 g/L (i.e., 2 g/dL) in a 24-hour period, bleeding that is retroperitoneal, pulmonary, intracranial, or otherwise involves the CNS, or bleeding that requires surgical intervention in an operating suite, including interventional radiology. CRNM bleeding satisfies one or both of the following criteria: overt bleeding for which blood product is administered and not directly attributable to the subject's underlying medical condition or bleeding that requires medical or surgical intervention to restore hemostasis, other than in an operating room.

Anti-Xa activity values (IIU/mL) will be converted to apixaban concentration data (ng/mL) based on the previously demonstrated linear relationship (e.g. Frost et al., 2014 - PMID: 24697979). The area under the curve (AUC) between administration (time 0) and the last measurable data point (AUC0-T) will be calculated with the 'Lin up/Log down' trapezoidal method. The AUCT-∞ will be obtained from the last measureable concentration divided by λ, and will be summed with AUC0-T to obtain AUC0-∞ (total exposure). the slope (λ) of the terminal phase of the concentration-time profile will be determined by log-linear regression on the appropriate number (typically at least 3) of data points. The terminal (elimination) half-life (t1/2, λ) will be calculated from Ln(2)/λ.

Apixaban concentration-time profiles will be generated and observed values for the descriptive PK parameter Cmax (peak plasma concentration) will be determined directly from the time-concentration curve

Apixaban concentration-time profiles will be generated and observed values for the descriptive PK parameter time to Cmax (Tmax)) will be determined directly from the time-concentration curve

The International Society on Thrombosis and Hemostasis criteria (ISTH) will be used to assess incidence of major bleeding. Participants were monitored for up to 90 days. This is the number of participants who have had at least one major bleeding incidence during the time of observation.

Participants were monitored for up to 90 days. This is the number of participants with bleeding events that did not meet the ISTH criteria but still required intervention. This is the number of participants who had at least one non-major bleeding event during the time of observation.

Major bleeding was defined as clinically overt bleeding accompanied by 1 or more of the following: * A decrease in hemoglobin of 20 g/L or more or * Required transfusion of 2 or more units of packed red blood cells or whole blood, or * Occurred in a critical site * Contributed to death. CRNM bleeding was defined as bleeding that did not meet the criteria for major bleeding but that, in routine clinical practice, would be considered relevant and not trivial by a patient and physician. Such bleeding satisfied a priori criteria defined by the ICAC, including: * Skin hematoma * Epistaxis that lasted for longer than 5 minutes, was repetitive, or led to an intervention * Hematuria that was macroscopic and either spontaneous or lasted for longer than 24 hours after instrumentation of the urogenital tract * Any other bleeding type that was considered to have clinical consequences.

Bleeding was assessed using the International Society on Thrombosis and Hemostasis (ISTH) guidelines. Events were adjudicated by the Clinical Events Committee (CEC). Event rate was number of participants with events divided by the number of participants treated, measured as a percentage (%). The primary outcome is based on data for the placebo and 2 apixaban low-dose groups (2.5 mg BID and 10 mg QD) combined across Phase A and Phase B. The analyses of Phase B data across all doses of apixaban are secondary because of the premature termination of the apixaban high-dose groups (10mg BID, 20mg QD) and the resulting lower duration of exposure for these groups.

Blood samples for Apixaban pharmacokinetics will be collected prior to apixaban administration at 0H, and then at 1, 2, 3, 4, 6, 12, 24, 48 and, 72 hours in each treatment arm.

Blood samples for Apixaban pharmacokinetics will be collected prior to apixaban administration at 0H, and then at 1, 2, 3, 4, 6, 12, 24, 48 and, 72 hours in each treatment arm.

Maximum observed plasma concentration (Cmax) measured in nanograms per milliliter (ng/mL)

Area Under the Plasma Concentration-time Curve (AUC) From Time of Zero Extrapolated to Infinite Time (INF) \[AUC (INF)\] is measured as nanograms multiplied by hours per milliliter (ng\*h/mL)

Area Under the Plasma Concentration-time Curve (AUC) From Time Zero to the Last Quantifiable Concentration \[AUC (0-T)\] is measured as nanograms multiplied by hours per milliliter (ng\*h/mL)

ETP was evaluated using a Thrombin Generation Assay (TGA), a validated automated ex vivo assay performed on platelet-poor plasma samples and based on the automated, calibrated thrombin generation method: thrombin formation was triggered with recombinant tissue factor and phospholipids. Thrombin concentration in each sample was calculated over time by measuring the cleavage of a fluorogenic substrate in the context of a paired calibration sample. Dedicated software (Thrombinoscope, Thrombinoscope B.V., Maastricht, The Netherlands) performed the calculations and derived ETP as area under the curve from the resulting "thrombogram" curve. Pre-infusion baseline= sample on Day 4, 3 hours post apixaban dose (just prior to IV infusion of PCC or placebo). Samples on Day 4 were obtained at 0 (pre-dose), 0.5, 1, 2, 3 hours post apixaban dose and at 0.5, 1, 2, 4, 6, 9, 21, 45, and 69 hours post infusion (PCC or Placebo) in each treatment period. ETP was measured as nanomolar\*minute (nM\*min).

ETP was evaluated using a Thrombin Generation Assay (TGA), a validated automated ex vivo assay performed on platelet-poor plasma samples and based on the automated, calibrated thrombin generation method: thrombin formation was triggered with recombinant tissue factor and phospholipids. Thrombin concentration in each sample was calculated over time by measuring the cleavage of a fluorogenic substrate in the context of a paired calibration sample. A dedicated software program (Thrombinoscope, Thrombinoscope B.V., Maastricht, The Netherlands) performed the calculations and derived ETP as area under the curve from the resulting "thrombogram" curve. Pre-dose Apixaban baseline was Day 1 pre-dose (0 hour). Samples on Day 4 were obtained at 0, 0.5, 1, 2, 3 hours post apixaban dose and at 0.5, 1, 2, 4, 6, 9, 21, 45, and 69 hours post infusion (PCC or Placebo) in each treatment period.

Maximum observed plasma concentration (Cmax) was measured by plasma concentration of apixaban over time. The geometric means are reported in nanograms per milliliter (ng/mL).

Maximum observed plasma concentration (Cmax) was measured by plasma concentration of BMS-730823 over time. The geometric means are reported in nanograms per milliliter (ng/mL).

Area under the concentration-time curve from time zero to time of the last quantifiable concentration (AUC(0-T)) was measured by plasma concentration of apixaban over time. The geometric means are reported in nanogram hours per milliliter (ng\*h/mL).

Area under the concentration-time curve from time zero to time of the last quantifiable concentration (AUC(0-T)) was measured by plasma concentration of BMS-730823 over time. The geometric means are reported in nanogram hours per milliliter (ng\*h/mL).

The area under the concentration-time curve from time zero extrapolated to infinite time (AUC(INF)) was measured by plasma concentration of apixaban over time. The geometric means are reported in nanogram hours per milliliter (ng\*h/mL).

The area under the concentration-time curve from time zero extrapolated to infinite time (AUC(INF)) was measured by plasma concentration of BMS-730823 over time. The geometric means are reported in nanogram hours per milliliter (ng\*h/mL).

Plasma terminal half-life (T-Half) for apixaban was derived from plasma concentrations versus time data. Means were reported in hours.

Mean plasma terminal half-life (T-Half) for BMS-730823 was derived from plasma concentrations versus time data.

Time of maximum observed plasma concentration (Tmax) for apixaban was derived from plasma concentrations versus time data. Medians were reported in hours.

Time of maximum observed plasma concentration (Tmax) for BMS-730823 was derived from plasma concentrations versus time data. Medians were reported in hours.

Area under the plasma concentration-time curve from 2 hours to 6 hours (AUC(2-6) for Apixaban was measured in participants with ESRD during dialysis in Period 1 only. Geometric Means were reported in nanogram hours per milliliter (ng\*hr/mL) and were determined from blood samples both entering and exiting the dialyzer.

Area under the plasma concentration-time curve from 2 hours to 6 hours (AUC(2-6) for BMS-730823 was measured in participants with ESRD during dialysis in Period 1 only. Geometric Means were reported in nanogram hours per milliliter (ng\*hr/mL) and were determined from blood samples both entering and exiting the dialyzer.

The percent dose recovered in urine was calculated by dividing the cumulative amount of unchanged apixaban excreted in urine from the time of dose up to 72 hours post-dose by the apixaban dose administered.

Percent dose of Apixaban recovered in dialysate (%DR) was calculated by dividing the cumulative amount of apixaban excreted in each dialysate collection over 2-6 hours (DR(2-6)) by the apixaban dose. %DR was recorded only in period 1.

Renal clearance (CLR) was calculated by dividing the cumulative amount of apixaban excreted in urine by the respective cumulative plasma AUC over the same urine collection interval. Geometric means were reported in milliliters per minute (mL/min).

Renal clearance (CLR) was calculated by dividing the cumulative amount of BMS-730823 excreted in urine by the respective cumulative plasma AUC over the same urine collection interval. Geometric means were reported in milliliters per minute (mL/min).

Hemodialysis clearance (CLD) was calculated by dividing the cumulative amount of apixaban excreted in dialysate by the respective cumulative plasma AUC over the same dialysate collection interval (AUC(2-6) entering). CLD measurements occurred only in period 1. Geometric means were reported in milliliters per minute (mL/min).

Hemodialysis clearance (CLD) was calculated by dividing the cumulative amount of BMS-730823 excreted in dialysate by the respective cumulative plasma AUC over the same dialysate collection interval (AUC(2-6) entering). CLD measurements occurred only in period 1. Geometric means were reported in milliliters per minute (mL/min).

The percentage of apixaban extracted during hemodialysis (extraction ratio) was calculated using the formula \[plasma AUC(2-6) exiting - AUC(2-6) entering\] / \[AUC(2-6) entering\] and converted to a percentage. The extraction ratio was measured in period 1 only, and was reported as a percentage.

The percentage of BMS-730823 extracted during hemodialysis (extraction ratio) was calculated using the formula \[plasma AUC(2-6)exiting - AUC(2-6)entering\] / \[AUC(2-6) entering\] and converted to a percentage. The extraction ratio was measured in period 1 only, and was reported as a percentage.