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Factor XI LICA to Reduce Events Such as Heart Attack and Stroke in Patients Whose Kidneys Are no Longer Able to Work as They Should and Require Treatment to Filter Wastes From the Blood: Focus is on the Safety of BAY2976217 and the Way the Body Absorbs, Distributes and Removes the Study Drug

Factor XI LICA to Reduce Thrombotic Events in End-Stage Renal Disease Patients on Hemodialysis: A Phase 2, Randomized, Double-Blind, Placebo-Controlled Study of the Safety, Pharmacokinetics, and Pharmacodynamics of Multiple Doses of BAY 2976217

Status
Completed
Phases
Phase 2
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT04534114
Acronym
RE-THINc ESRD
Enrollment
307
Registered
2020-09-01
Start date
2020-09-04
Completion date
2022-05-12
Last updated
2023-07-03

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

End Stage Renal Disease Requiring Hemodialysis

Keywords

End stage renal disease (ESRD), Hemodialysis (HD), Thrombotic Events

Brief summary

Patients whose kidneys are no longer able to work as they should and require treatment to filter wastes from the blood (hemodialysis) are at high risk for blood clots that form in blood vessels (thrombosis) blocking blood flow that causes heart attacks, strokes, and other life-threatening conditions. BAY2976217 is under clinical development for prevention of thrombosis. The goal of the study is to learn more about the safety of BAY2976217, how it is tolerated and the way the body absorbs, distributes and gets rid of the study dug given as multiple doses in participants with renal impairment who require hemodialysis.

Interventions

DRUGFesomersen sodium (BAY2976217)

Study intervention will be injected subcutaneously.

DRUGPlacebo

Matching placebo to BAY2976217 will be injected subcutaneously.

Sponsors

Bayer
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
QUADRUPLE (Subject, Caregiver, Investigator, Outcomes Assessor)

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

* Participant must be at least 18 years of age at the time of signing the informed consent form (ICF) * Participants with ESRD on hemodialysis (HD) for ≥3 months at the time of signing of the ICF, receiving dialysis at least 9 hours a week and stable in the view of the investigator * Male or female (contraceptive use by men or women should be consistent with local regulations regarding the methods of contraception for those participating in clinical studies) * Capable of giving signed ICF as described in the Protocol, which includes compliance with the requirements and restrictions listed in the ICF and in the protocol

Exclusion criteria

* Participants receiving antiplatelet therapy except daily acetylsalicylic acid (ASA) ≤ 150 mg/day * Participants receiving anticoagulation in therapeutic doses, other than standard anticoagulation during the hemodialysis procedure * Known inherited bleeding disorder e.g. von-Willebrand disease or Hemophilia A, B or C * Recent (\<6 months before screening) clinically significant bleeding, or at high risk of bleeding (in the judgement of the investigator) * Recent (\<3 months before screening) thromboembolic event, e.g. acute coronary syndrome, stroke, or Venous thromboembolism (except dialysis access thrombosis) * Recent (\<3 months before screening) major surgery or scheduled major surgery during participation in the study * Scheduled living donor renal transplant during study participation * Known Hepatitis B or C * Known HIV with recent documented detectable viral load (\<3 months before screening) * Persistent heart failure as classified by the New York Heart Association classification of 3 or higher * Life expectancy less than 6 months * Sustained uncontrolled hypertension (persistent measurements of diastolic blood pressure ≥ 100 mmHg, and/or systolic blood pressure ≥ 180 mmHg) * Hepatic disease associated with either: coagulopathy leading to a clinically relevant bleeding risk, or ALT \> 3x ULN, or total bilirubin \>2x ULN with direct bilirubin \> 20% of the total * Hb \< 9.0 g/dL at screening * Platelet count \< 120,000 mm\^3 at screening * Known hypersensitivity to the investigational drug or to inactive constituents of the study intervention * Active malignancy requiring treatment during study participation (except non-melanoma skin cancer, or cervical carcinoma in situ) * Participation in a study with an investigational medicinal product within 30 days or within 5 half-lives of the previous administered drug, whichever is longer, prior to the screening/observational period (Note: Participants from previous BAY2306001/ISIS 416858 and BAY2976217/ ION 957943 studies are eligible) * Any other conditions, which, in the opinion of the investigator or Sponsor would make the subject unsuitable for inclusion * Confirmed pregnancy

Design outcomes

Primary

MeasureTime frameDescription
Incidence of Composite of Major Bleeding (MB) and Clinically-relevant Non-major Bleeding (CRNMB) During the Main Treatment Period and Within the On-treatment Time Window, as Assessed by Blinded Central Independent Adjudication Committee (CIAC)Up to 24 weeksMB is defined as symptomatic bleeding and: 1) Fatal bleeding, and/or; 2) Bleeding in a critical area or organ, such as intracranial, intraspinal, intraocular, retroperitoneal, intraarticular or pericardial, or intramuscular with compartment syndrome, and/or; 3) Bleeding causing a fall in hemoglobin level of 20 g/L (2.0 g/dL) (1.24 mmol/L) or more, or leading to transfusion of two or more units of whole blood or red cells. CRNMB is defined as any sign or symptom of hemorrhage that does not fit the criteria for the ISTH definition of major bleeding but does meet at least one of the following criteria: 1) Requiring medical intervention by a healthcare professional; 2) Leading to hospitalization or increased level of care; 3) Prompting a face-to-face evaluation. n/100 person-years: number of subjects with incident events divided by the cumulative at-risk time in the reference population, where a subject is no longer at risk once an incident event occurred.

Secondary

MeasureTime frameDescription
Number of Participants With Treatment-emergent Adverse Events (TEAEs) During the Main Treatment Period and Within the On-treatment Time Window and Their SeverityUp to 24 weeksTEAEs were analyzed during the on-treatment time window within the main treatment period in the safety analysis set (SAF). Data observed from the randomization date until the end of the main treatment period. TEAEs were defined as events occurring after first study intervention administration and up to 20 weeks after last study intervention administration.
Number of Participants With TEAEs During the Main and Extended Treatment Periods and Within the On-treatment Time Window and Their SeverityUp to 48 weeksTEAEs were analyzed during during main and extended treatment periods in the safety analysis set (SAF). Data observed from the randomization date until the end of the extension treatment period. TEAEs were defined as events occurring after first study intervention administration and up to 20 weeks after last study intervention administration.
Number of Participants With TEAEs During the Main and Extended Treatment Periods and Until 20 Weeks After the Last Study Intervention Dose and Their SeverityUp to 48 weeksTEAEs occurring from first study intervention intake until 20 weeks after last study intervention intake.
Incidence of Composite of MB and CRNMB During the Main and Extended Treatment Periods and Within the On-treatment Time Window, as Assessed by Blinded CIACUp to 48 weeksMB is defined as symptomatic bleeding and: 1) Fatal bleeding, and/or; 2) Bleeding in a critical area or organ, such as intracranial, intraspinal, intraocular, retroperitoneal, intraarticular or pericardial, or intramuscular with compartment syndrome, and/or; 3) Bleeding causing a fall in hemoglobin level of 20 g/L (2.0 g/dL) (1.24 mmol/L) or more, or leading to transfusion of two or more units of whole blood or red cells. CRNMB is defined as any sign or symptom of hemorrhage that does not fit the criteria for the ISTH definition of major bleeding but does meet at least one of the following criteria: 1) Requiring medical intervention by a healthcare professional; 2) Leading to hospitalization or increased level of care; 3) Prompting a face-to-face evaluation. n/100 person-years: number of subjects with incident events divided by the cumulative at-risk time in the reference population, where a subject is no longer at risk once an incident event occurred.
Maximum Change in FXI (Coagulation Factor XI) Antigen Levels During the Main Treatment PeriodUp to 24 weeksThe secondary endpoint of change in FXI antigen levels during the main treatment period was an optional secondary endpoint only as mentioned in the integrated clinical protocol amendment version 3.0 and was not analyzed in this study as the FXI activity assay is sufficient to describe the effect on FXI level in plasma.
Maximum Change in FXI Activity Levels During the Main Treatment PeriodBaseline, Days 1 (Pre-Dose and 5 hours post-dose), 2, 8, 15, 22, 29 (Pre-dose and 5 hours post-dose), 43, 57 (Pre-dose), 71, 85 (Pre-dose), 113 (Pre-dose), 141 (Pre-dose),148, 155, 162, and 169 (Pre-dose)The FXIa activity was measured by a fluorogenic activated FXIa activity (AXIA) assay. Absolute change from baseline at each visit until Visit 22 (Day 169) are reported.
Trough Concentrations (Ctrough) of Three Dose Levels of FesomersenAt visits V12 (Day 57), V14 (Day 85), V16 (Day 113), V18 (Day 141)Trough (pre-dose) fesomersen-equivalent plasma concentrations (Ctrough) for 3 dose levels of fesomersen were summarized descriptively by dose level and visit: Visit 12, Visit 14, Visit 16, Visit 18 (main treatment period). Ctrough was not measured for the placebo group.

Countries

Belgium, Bulgaria, Canada, Czechia, Germany, Greece, Hungary, Japan, Latvia, Russia, South Korea, Spain, Taiwan, Ukraine, United States

Participant flow

Recruitment details

Study was conducted at 69 study centers in 15 countries between 04-SEP-2020 (first participant first visit) and 12-MAY-2022 (last participant last visit).

Pre-assignment details

From 359 participants screened, 51 participants were screening failure and a total of 308 participants were randomized and 307 were treated either with fesomersen or placebo.

Participants by arm

ArmCount
Fesomersen 40 mg
Participants received monthly subcutaneous treatment with 40 mg fesomersen (Factor XI LICA). LICA=Ligand conjugated antisense oligonucleotide.
77
Fesomersen 80 mg
Participants received monthly subcutaneous treatment with 80 mg fesomersen (Factor XI LICA). LICA=Ligand conjugated antisense oligonucleotide.
79
Fesomersen 120 mg
Participants received monthly subcutaneous treatment with 120 mg fesomersen (Factor XI LICA). LICA=Ligand conjugated antisense oligonucleotide.
76
Placebo
Participants received monthly subcutaneous treatment with matching placebo to fesomersen (Factor XI LICA). LICA=Ligand conjugated antisense oligonucleotide.
75
Total307

Withdrawals & dropouts

PeriodReasonFG000FG001FG002FG003
Extension Treatment PeriodAdverse Event0101
Extension Treatment PeriodCOVID-19 pandemic: Death0001
Extension Treatment PeriodCOVID-19 pandemic: withdrawal following protocol1000
Extension Treatment PeriodDeath0012
Extension Treatment PeriodOther reason0100
Extension Treatment PeriodProtocol-specified Withdrawal Criterion Met2201
Main Treatment PeriodAdverse Event4212
Main Treatment PeriodCOVID-19 pandemic: Adverse event0110
Main Treatment PeriodCOVID-19 pandemic: Death0102
Main Treatment PeriodCOVID-19 pandemic: Participant decision0100
Main Treatment PeriodCOVID-19 pandemic: withdrawal following protocol1331
Main Treatment PeriodDeath1001
Main Treatment PeriodOther reason1100
Main Treatment PeriodParticipant decision1331
Main Treatment PeriodPhysician Decision0001
Main Treatment PeriodProtocol-specified withdrawal criterion met2146

Baseline characteristics

CharacteristicFesomersen 40 mgFesomersen 80 mgFesomersen 120 mgPlaceboTotal
Age, Continuous60.4 Years
STANDARD_DEVIATION 13.2
58.0 Years
STANDARD_DEVIATION 14.4
57.7 Years
STANDARD_DEVIATION 13.3
58.6 Years
STANDARD_DEVIATION 11.9
58.7 Years
STANDARD_DEVIATION 13.2
Ethnicity (NIH/OMB)
Hispanic or Latino
3 Participants6 Participants1 Participants2 Participants12 Participants
Ethnicity (NIH/OMB)
Not Hispanic or Latino
74 Participants73 Participants75 Participants72 Participants294 Participants
Ethnicity (NIH/OMB)
Unknown or Not Reported
0 Participants0 Participants0 Participants1 Participants1 Participants
Race (NIH/OMB)
American Indian or Alaska Native
0 Participants0 Participants0 Participants0 Participants0 Participants
Race (NIH/OMB)
Asian
12 Participants8 Participants11 Participants13 Participants44 Participants
Race (NIH/OMB)
Black or African American
2 Participants1 Participants4 Participants1 Participants8 Participants
Race (NIH/OMB)
More than one race
0 Participants0 Participants0 Participants0 Participants0 Participants
Race (NIH/OMB)
Native Hawaiian or Other Pacific Islander
0 Participants0 Participants0 Participants0 Participants0 Participants
Race (NIH/OMB)
Unknown or Not Reported
1 Participants0 Participants0 Participants0 Participants1 Participants
Race (NIH/OMB)
White
62 Participants70 Participants61 Participants61 Participants254 Participants
Sex: Female, Male
Female
35 Participants20 Participants30 Participants22 Participants107 Participants
Sex: Female, Male
Male
42 Participants59 Participants46 Participants53 Participants200 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
EG002
affected / at risk
EG003
affected / at risk
deaths
Total, all-cause mortality
2 / 771 / 792 / 767 / 75
other
Total, other adverse events
31 / 7727 / 7930 / 7621 / 75
serious
Total, serious adverse events
19 / 7718 / 7917 / 7620 / 75

Outcome results

Primary

Incidence of Composite of Major Bleeding (MB) and Clinically-relevant Non-major Bleeding (CRNMB) During the Main Treatment Period and Within the On-treatment Time Window, as Assessed by Blinded Central Independent Adjudication Committee (CIAC)

MB is defined as symptomatic bleeding and: 1) Fatal bleeding, and/or; 2) Bleeding in a critical area or organ, such as intracranial, intraspinal, intraocular, retroperitoneal, intraarticular or pericardial, or intramuscular with compartment syndrome, and/or; 3) Bleeding causing a fall in hemoglobin level of 20 g/L (2.0 g/dL) (1.24 mmol/L) or more, or leading to transfusion of two or more units of whole blood or red cells. CRNMB is defined as any sign or symptom of hemorrhage that does not fit the criteria for the ISTH definition of major bleeding but does meet at least one of the following criteria: 1) Requiring medical intervention by a healthcare professional; 2) Leading to hospitalization or increased level of care; 3) Prompting a face-to-face evaluation. n/100 person-years: number of subjects with incident events divided by the cumulative at-risk time in the reference population, where a subject is no longer at risk once an incident event occurred.

Time frame: Up to 24 weeks

Population: Safety analysis set (SAF) includes all randomized participants who received at least one dose of the study intervention according to actual treatment arm received.

ArmMeasureValue (NUMBER)
Fesomersen 40 mgIncidence of Composite of Major Bleeding (MB) and Clinically-relevant Non-major Bleeding (CRNMB) During the Main Treatment Period and Within the On-treatment Time Window, as Assessed by Blinded Central Independent Adjudication Committee (CIAC)9.0 n/100 person-years
Fesomersen 80 mgIncidence of Composite of Major Bleeding (MB) and Clinically-relevant Non-major Bleeding (CRNMB) During the Main Treatment Period and Within the On-treatment Time Window, as Assessed by Blinded Central Independent Adjudication Committee (CIAC)9.1 n/100 person-years
Fesomersen 120 mgIncidence of Composite of Major Bleeding (MB) and Clinically-relevant Non-major Bleeding (CRNMB) During the Main Treatment Period and Within the On-treatment Time Window, as Assessed by Blinded Central Independent Adjudication Committee (CIAC)6.1 n/100 person-years
PlaceboIncidence of Composite of Major Bleeding (MB) and Clinically-relevant Non-major Bleeding (CRNMB) During the Main Treatment Period and Within the On-treatment Time Window, as Assessed by Blinded Central Independent Adjudication Committee (CIAC)9.7 n/100 person-years
p-value: 0.94495% CI: [0.19, 4.68]Log Rank
p-value: 0.95395% CI: [0.19, 4.72]Log Rank
p-value: 0.60595% CI: [0.1, 3.75]Log Rank
Secondary

Incidence of Composite of MB and CRNMB During the Main and Extended Treatment Periods and Within the On-treatment Time Window, as Assessed by Blinded CIAC

MB is defined as symptomatic bleeding and: 1) Fatal bleeding, and/or; 2) Bleeding in a critical area or organ, such as intracranial, intraspinal, intraocular, retroperitoneal, intraarticular or pericardial, or intramuscular with compartment syndrome, and/or; 3) Bleeding causing a fall in hemoglobin level of 20 g/L (2.0 g/dL) (1.24 mmol/L) or more, or leading to transfusion of two or more units of whole blood or red cells. CRNMB is defined as any sign or symptom of hemorrhage that does not fit the criteria for the ISTH definition of major bleeding but does meet at least one of the following criteria: 1) Requiring medical intervention by a healthcare professional; 2) Leading to hospitalization or increased level of care; 3) Prompting a face-to-face evaluation. n/100 person-years: number of subjects with incident events divided by the cumulative at-risk time in the reference population, where a subject is no longer at risk once an incident event occurred.

Time frame: Up to 48 weeks

Population: Safety analysis set (SAF) includes all randomized participants who received at least one dose of the study intervention according to actual treatment arm received.

ArmMeasureValue (NUMBER)
Fesomersen 40 mgIncidence of Composite of MB and CRNMB During the Main and Extended Treatment Periods and Within the On-treatment Time Window, as Assessed by Blinded CIAC10.7 n/100 person-years
Fesomersen 80 mgIncidence of Composite of MB and CRNMB During the Main and Extended Treatment Periods and Within the On-treatment Time Window, as Assessed by Blinded CIAC8.6 n/100 person-years
Fesomersen 120 mgIncidence of Composite of MB and CRNMB During the Main and Extended Treatment Periods and Within the On-treatment Time Window, as Assessed by Blinded CIAC6.4 n/100 person-years
PlaceboIncidence of Composite of MB and CRNMB During the Main and Extended Treatment Periods and Within the On-treatment Time Window, as Assessed by Blinded CIAC7.0 n/100 person-years
p-value: 0.61295% CI: [0.34, 6.08]Log Rank
p-value: 0.75795% CI: [0.28, 5.66]Log Rank
p-value: 0.90995% CI: [0.18, 4.52]Log Rank
Secondary

Maximum Change in FXI Activity Levels During the Main Treatment Period

The FXIa activity was measured by a fluorogenic activated FXIa activity (AXIA) assay. Absolute change from baseline at each visit until Visit 22 (Day 169) are reported.

Time frame: Baseline, Days 1 (Pre-Dose and 5 hours post-dose), 2, 8, 15, 22, 29 (Pre-dose and 5 hours post-dose), 43, 57 (Pre-dose), 71, 85 (Pre-dose), 113 (Pre-dose), 141 (Pre-dose),148, 155, 162, and 169 (Pre-dose)

Population: Pharmacodynamic set (PDS) includes all participants with at least 1 PD sample in accordance with the PD sampling schedule and without deviation from the protocol that would interfere with the evaluation of the PD data were included in the PD analysis.

ArmMeasureGroupValue (MEAN)Dispersion
Fesomersen 40 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodBaseline0.00 U/mLStandard Deviation 0
Fesomersen 40 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 5 (Day 1): Pre-dose0.06 U/mLStandard Deviation 0.06
Fesomersen 40 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 16 (Day 113): Pre-dose0.46 U/mLStandard Deviation 0.26
Fesomersen 40 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 14 (Day 85): Pre-dose0.46 U/mLStandard Deviation 0.27
Fesomersen 40 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 18 (Day 141): Pre-dose0.47 U/mLStandard Deviation 0.27
Fesomersen 40 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 20 (Day 155)0.52 U/mLStandard Deviation 0.28
Fesomersen 40 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 9 (Day 22)0.37 U/mLStandard Deviation 0.26
Fesomersen 40 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 12 (Day 57): Pre-dose0.42 U/mLStandard Deviation 0.26
Fesomersen 40 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 8 (Day 15)0.34 U/mLStandard Deviation 0.23
Fesomersen 40 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 6 (Day 2): 22 Hours0.13 U/mLStandard Deviation 0.11
Fesomersen 40 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 10 (Day 29): Pre-dose0.34 U/mLStandard Deviation 0.26
Fesomersen 40 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 13 (Day 71)0.52 U/mLStandard Deviation 0.26
Fesomersen 40 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 5 (Day 1): 5 Hours0.09 U/mLStandard Deviation 0.09
Fesomersen 40 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 19 (Day 148)0.52 U/mLStandard Deviation 0.27
Fesomersen 40 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 10 (Day 29): 5 Hours0.32 U/mLStandard Deviation 0.25
Fesomersen 40 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 21 (Day 162)0.50 U/mLStandard Deviation 0.3
Fesomersen 40 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 22 (Day 169): Pre-dose0.46 U/mLStandard Deviation 0.29
Fesomersen 40 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 7 (Day 8)0.21 U/mLStandard Deviation 0.15
Fesomersen 40 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 11 (Day 43)0.47 U/mLStandard Deviation 0.29
Fesomersen 80 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 7 (Day 8)0.32 U/mLStandard Deviation 0.15
Fesomersen 80 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 12 (Day 57): Pre-dose0.55 U/mLStandard Deviation 0.24
Fesomersen 80 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 5 (Day 1): 5 Hours0.11 U/mLStandard Deviation 0.12
Fesomersen 80 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 16 (Day 113): Pre-dose0.57 U/mLStandard Deviation 0.28
Fesomersen 80 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 13 (Day 71)0.66 U/mLStandard Deviation 0.24
Fesomersen 80 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 14 (Day 85): Pre-dose0.59 U/mLStandard Deviation 0.26
Fesomersen 80 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 21 (Day 162)0.64 U/mLStandard Deviation 0.28
Fesomersen 80 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 6 (Day 2): 22 Hours0.12 U/mLStandard Deviation 0.12
Fesomersen 80 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 22 (Day 169): Pre-dose0.59 U/mLStandard Deviation 0.28
Fesomersen 80 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 11 (Day 43)0.59 U/mLStandard Deviation 0.25
Fesomersen 80 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 20 (Day 155)0.65 U/mLStandard Deviation 0.29
Fesomersen 80 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 8 (Day 15)0.48 U/mLStandard Deviation 0.21
Fesomersen 80 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 5 (Day 1): Pre-dose0.05 U/mLStandard Deviation 0.06
Fesomersen 80 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 9 (Day 22)0.50 U/mLStandard Deviation 0.23
Fesomersen 80 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 19 (Day 148)0.63 U/mLStandard Deviation 0.29
Fesomersen 80 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 10 (Day 29): Pre-dose0.44 U/mLStandard Deviation 0.21
Fesomersen 80 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodBaseline0.00 U/mLStandard Deviation 0
Fesomersen 80 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 10 (Day 29): 5 Hours0.43 U/mLStandard Deviation 0.22
Fesomersen 80 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 18 (Day 141): Pre-dose0.56 U/mLStandard Deviation 0.28
Fesomersen 120 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 20 (Day 155)0.77 U/mLStandard Deviation 0.25
Fesomersen 120 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodBaseline0.00 U/mLStandard Deviation 0
Fesomersen 120 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 5 (Day 1): Pre-dose0.05 U/mLStandard Deviation 0.05
Fesomersen 120 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 5 (Day 1): 5 Hours0.13 U/mLStandard Deviation 0.13
Fesomersen 120 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 6 (Day 2): 22 Hours0.15 U/mLStandard Deviation 0.13
Fesomersen 120 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 7 (Day 8)0.43 U/mLStandard Deviation 0.18
Fesomersen 120 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 8 (Day 15)0.61 U/mLStandard Deviation 0.24
Fesomersen 120 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 9 (Day 22)0.63 U/mLStandard Deviation 0.25
Fesomersen 120 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 10 (Day 29): Pre-dose0.60 U/mLStandard Deviation 0.25
Fesomersen 120 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 10 (Day 29): 5 Hours0.58 U/mLStandard Deviation 0.25
Fesomersen 120 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 11 (Day 43)0.76 U/mLStandard Deviation 0.27
Fesomersen 120 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 12 (Day 57): Pre-dose0.69 U/mLStandard Deviation 0.28
Fesomersen 120 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 13 (Day 71)0.76 U/mLStandard Deviation 0.25
Fesomersen 120 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 14 (Day 85): Pre-dose0.72 U/mLStandard Deviation 0.24
Fesomersen 120 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 16 (Day 113): Pre-dose0.75 U/mLStandard Deviation 0.25
Fesomersen 120 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 18 (Day 141): Pre-dose0.72 U/mLStandard Deviation 0.25
Fesomersen 120 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 19 (Day 148)0.76 U/mLStandard Deviation 0.26
Fesomersen 120 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 21 (Day 162)0.75 U/mLStandard Deviation 0.26
Fesomersen 120 mgMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 22 (Day 169): Pre-dose0.73 U/mLStandard Deviation 0.25
PlaceboMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 11 (Day 43)0.09 U/mLStandard Deviation 0.08
PlaceboMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 10 (Day 29): 5 Hours0.12 U/mLStandard Deviation 0.14
PlaceboMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 5 (Day 1): Pre-dose0.04 U/mLStandard Deviation 0.05
PlaceboMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 18 (Day 141): Pre-dose0.12 U/mLStandard Deviation 0.09
PlaceboMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 10 (Day 29): Pre-dose0.09 U/mLStandard Deviation 0.07
PlaceboMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 9 (Day 22)0.11 U/mLStandard Deviation 0.09
PlaceboMaximum Change in FXI Activity Levels During the Main Treatment PeriodBaseline0.00 U/mLStandard Deviation 0
PlaceboMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 8 (Day 15)0.12 U/mLStandard Deviation 0.09
PlaceboMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 7 (Day 8)0.08 U/mLStandard Deviation 0.07
PlaceboMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 19 (Day 148)0.15 U/mLStandard Deviation 0.16
PlaceboMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 20 (Day 155)0.15 U/mLStandard Deviation 0.17
PlaceboMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 6 (Day 2): 22 Hours0.14 U/mLStandard Deviation 0.13
PlaceboMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 5 (Day 1): 5 Hours0.10 U/mLStandard Deviation 0.08
PlaceboMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 22 (Day 169): Pre-dose0.17 U/mLStandard Deviation 0.21
PlaceboMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 14 (Day 85): Pre-dose0.14 U/mLStandard Deviation 0.12
PlaceboMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 13 (Day 71)0.15 U/mLStandard Deviation 0.13
PlaceboMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 12 (Day 57): Pre-dose0.11 U/mLStandard Deviation 0.1
PlaceboMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 21 (Day 162)0.16 U/mLStandard Deviation 0.2
PlaceboMaximum Change in FXI Activity Levels During the Main Treatment PeriodVisit 16 (Day 113): Pre-dose0.16 U/mLStandard Deviation 0.16
Secondary

Maximum Change in FXI (Coagulation Factor XI) Antigen Levels During the Main Treatment Period

The secondary endpoint of change in FXI antigen levels during the main treatment period was an optional secondary endpoint only as mentioned in the integrated clinical protocol amendment version 3.0 and was not analyzed in this study as the FXI activity assay is sufficient to describe the effect on FXI level in plasma.

Time frame: Up to 24 weeks

Population: Pharmacodynamic set (PDS) includes all participants with at least 1 PD sample in accordance with the PD sampling schedule and without deviation from the protocol that would interfere with the evaluation of the PD data were included in the PD analysis. Data were not collected for this outcome measure.

ArmMeasureGroupValue
UnknownMaximum Change in FXI (Coagulation Factor XI) Antigen Levels During the Main Treatment PeriodBaseline
UnknownMaximum Change in FXI (Coagulation Factor XI) Antigen Levels During the Main Treatment PeriodVisit 5 (Day 1)
Secondary

Number of Participants With TEAEs During the Main and Extended Treatment Periods and Until 20 Weeks After the Last Study Intervention Dose and Their Severity

TEAEs occurring from first study intervention intake until 20 weeks after last study intervention intake.

Time frame: Up to 48 weeks

Population: Safety analysis set (SAF) includes all randomized participants who received at least one dose of the study intervention according to actual treatment arm received.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
Fesomersen 40 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Until 20 Weeks After the Last Study Intervention Dose and Their SeverityAny TEAE64 Participants
Fesomersen 40 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Until 20 Weeks After the Last Study Intervention Dose and Their SeverityMaximum intensity for any TEAE: Mild21 Participants
Fesomersen 40 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Until 20 Weeks After the Last Study Intervention Dose and Their SeverityMaximum intensity for any TEAE: Moderate28 Participants
Fesomersen 40 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Until 20 Weeks After the Last Study Intervention Dose and Their SeverityMaximum intensity for any TEAE: Severe15 Participants
Fesomersen 80 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Until 20 Weeks After the Last Study Intervention Dose and Their SeverityMaximum intensity for any TEAE: Mild21 Participants
Fesomersen 80 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Until 20 Weeks After the Last Study Intervention Dose and Their SeverityMaximum intensity for any TEAE: Moderate33 Participants
Fesomersen 80 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Until 20 Weeks After the Last Study Intervention Dose and Their SeverityMaximum intensity for any TEAE: Severe9 Participants
Fesomersen 80 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Until 20 Weeks After the Last Study Intervention Dose and Their SeverityAny TEAE63 Participants
Fesomersen 120 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Until 20 Weeks After the Last Study Intervention Dose and Their SeverityMaximum intensity for any TEAE: Moderate33 Participants
Fesomersen 120 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Until 20 Weeks After the Last Study Intervention Dose and Their SeverityMaximum intensity for any TEAE: Mild18 Participants
Fesomersen 120 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Until 20 Weeks After the Last Study Intervention Dose and Their SeverityMaximum intensity for any TEAE: Severe11 Participants
Fesomersen 120 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Until 20 Weeks After the Last Study Intervention Dose and Their SeverityAny TEAE62 Participants
PlaceboNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Until 20 Weeks After the Last Study Intervention Dose and Their SeverityMaximum intensity for any TEAE: Severe16 Participants
PlaceboNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Until 20 Weeks After the Last Study Intervention Dose and Their SeverityMaximum intensity for any TEAE: Mild21 Participants
PlaceboNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Until 20 Weeks After the Last Study Intervention Dose and Their SeverityAny TEAE59 Participants
PlaceboNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Until 20 Weeks After the Last Study Intervention Dose and Their SeverityMaximum intensity for any TEAE: Moderate22 Participants
Secondary

Number of Participants With TEAEs During the Main and Extended Treatment Periods and Within the On-treatment Time Window and Their Severity

TEAEs were analyzed during during main and extended treatment periods in the safety analysis set (SAF). Data observed from the randomization date until the end of the extension treatment period. TEAEs were defined as events occurring after first study intervention administration and up to 20 weeks after last study intervention administration.

Time frame: Up to 48 weeks

Population: Safety analysis set (SAF) includes all randomized participants who received at least one dose of the study intervention according to actual treatment arm received.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
Fesomersen 40 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Mild26 Participants
Fesomersen 40 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Severe11 Participants
Fesomersen 40 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Within the On-treatment Time Window and Their SeverityAny TEAE61 Participants
Fesomersen 40 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Moderate24 Participants
Fesomersen 80 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Within the On-treatment Time Window and Their SeverityAny TEAE62 Participants
Fesomersen 80 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Severe6 Participants
Fesomersen 80 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Mild25 Participants
Fesomersen 80 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Moderate31 Participants
Fesomersen 120 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Within the On-treatment Time Window and Their SeverityAny TEAE58 Participants
Fesomersen 120 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Severe8 Participants
Fesomersen 120 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Moderate30 Participants
Fesomersen 120 mgNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Mild20 Participants
PlaceboNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Severe12 Participants
PlaceboNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Mild26 Participants
PlaceboNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Moderate18 Participants
PlaceboNumber of Participants With TEAEs During the Main and Extended Treatment Periods and Within the On-treatment Time Window and Their SeverityAny TEAE56 Participants
Secondary

Number of Participants With Treatment-emergent Adverse Events (TEAEs) During the Main Treatment Period and Within the On-treatment Time Window and Their Severity

TEAEs were analyzed during the on-treatment time window within the main treatment period in the safety analysis set (SAF). Data observed from the randomization date until the end of the main treatment period. TEAEs were defined as events occurring after first study intervention administration and up to 20 weeks after last study intervention administration.

Time frame: Up to 24 weeks

Population: Safety analysis set (SAF) includes all randomized participants who received at least one dose of the study intervention according to actual treatment arm received.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
Fesomersen 40 mgNumber of Participants With Treatment-emergent Adverse Events (TEAEs) During the Main Treatment Period and Within the On-treatment Time Window and Their SeverityAny TEAE54 Participants
Fesomersen 40 mgNumber of Participants With Treatment-emergent Adverse Events (TEAEs) During the Main Treatment Period and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Mild28 Participants
Fesomersen 40 mgNumber of Participants With Treatment-emergent Adverse Events (TEAEs) During the Main Treatment Period and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Moderate17 Participants
Fesomersen 40 mgNumber of Participants With Treatment-emergent Adverse Events (TEAEs) During the Main Treatment Period and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Severe9 Participants
Fesomersen 80 mgNumber of Participants With Treatment-emergent Adverse Events (TEAEs) During the Main Treatment Period and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Mild28 Participants
Fesomersen 80 mgNumber of Participants With Treatment-emergent Adverse Events (TEAEs) During the Main Treatment Period and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Moderate24 Participants
Fesomersen 80 mgNumber of Participants With Treatment-emergent Adverse Events (TEAEs) During the Main Treatment Period and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Severe4 Participants
Fesomersen 80 mgNumber of Participants With Treatment-emergent Adverse Events (TEAEs) During the Main Treatment Period and Within the On-treatment Time Window and Their SeverityAny TEAE56 Participants
Fesomersen 120 mgNumber of Participants With Treatment-emergent Adverse Events (TEAEs) During the Main Treatment Period and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Moderate28 Participants
Fesomersen 120 mgNumber of Participants With Treatment-emergent Adverse Events (TEAEs) During the Main Treatment Period and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Mild22 Participants
Fesomersen 120 mgNumber of Participants With Treatment-emergent Adverse Events (TEAEs) During the Main Treatment Period and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Severe5 Participants
Fesomersen 120 mgNumber of Participants With Treatment-emergent Adverse Events (TEAEs) During the Main Treatment Period and Within the On-treatment Time Window and Their SeverityAny TEAE55 Participants
PlaceboNumber of Participants With Treatment-emergent Adverse Events (TEAEs) During the Main Treatment Period and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Severe9 Participants
PlaceboNumber of Participants With Treatment-emergent Adverse Events (TEAEs) During the Main Treatment Period and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Mild27 Participants
PlaceboNumber of Participants With Treatment-emergent Adverse Events (TEAEs) During the Main Treatment Period and Within the On-treatment Time Window and Their SeverityAny TEAE55 Participants
PlaceboNumber of Participants With Treatment-emergent Adverse Events (TEAEs) During the Main Treatment Period and Within the On-treatment Time Window and Their SeverityMaximum intensity for any TEAE: Moderate19 Participants
Secondary

Trough Concentrations (Ctrough) of Three Dose Levels of Fesomersen

Trough (pre-dose) fesomersen-equivalent plasma concentrations (Ctrough) for 3 dose levels of fesomersen were summarized descriptively by dose level and visit: Visit 12, Visit 14, Visit 16, Visit 18 (main treatment period). Ctrough was not measured for the placebo group.

Time frame: At visits V12 (Day 57), V14 (Day 85), V16 (Day 113), V18 (Day 141)

Population: Pharmacokinetic analysis set (PKS) includes all fesomersen-treated participants with at least 1 PK sample in accordance with the PK sampling schedule and without deviation from the protocol that would interfere with the evaluation of the PK data were included in the PK analysis. Only those participants who have sample collection with data available at the specified time points were analyzed.

ArmMeasureGroupValue (GEOMETRIC_MEAN)Dispersion
Fesomersen 40 mgTrough Concentrations (Ctrough) of Three Dose Levels of FesomersenVisit 120.000454 μg/mLGeometric Coefficient of Variation 118.753791
Fesomersen 40 mgTrough Concentrations (Ctrough) of Three Dose Levels of FesomersenVisit 140.000490 μg/mLGeometric Coefficient of Variation 92.511801
Fesomersen 40 mgTrough Concentrations (Ctrough) of Three Dose Levels of FesomersenVisit 160.000572 μg/mLGeometric Coefficient of Variation 85.974878
Fesomersen 40 mgTrough Concentrations (Ctrough) of Three Dose Levels of FesomersenVisit 180.000521 μg/mLGeometric Coefficient of Variation 106.848825
Fesomersen 80 mgTrough Concentrations (Ctrough) of Three Dose Levels of FesomersenVisit 180.000828 μg/mLGeometric Coefficient of Variation 91.024162
Fesomersen 80 mgTrough Concentrations (Ctrough) of Three Dose Levels of FesomersenVisit 120.000704 μg/mLGeometric Coefficient of Variation 80.938271
Fesomersen 80 mgTrough Concentrations (Ctrough) of Three Dose Levels of FesomersenVisit 160.000789 μg/mLGeometric Coefficient of Variation 68.188121
Fesomersen 80 mgTrough Concentrations (Ctrough) of Three Dose Levels of FesomersenVisit 140.000792 μg/mLGeometric Coefficient of Variation 82.170296
Fesomersen 120 mgTrough Concentrations (Ctrough) of Three Dose Levels of FesomersenVisit 180.001424 μg/mLGeometric Coefficient of Variation 92.709743
Fesomersen 120 mgTrough Concentrations (Ctrough) of Three Dose Levels of FesomersenVisit 140.001246 μg/mLGeometric Coefficient of Variation 97.53082
Fesomersen 120 mgTrough Concentrations (Ctrough) of Three Dose Levels of FesomersenVisit 160.001346 μg/mLGeometric Coefficient of Variation 81.80568
Fesomersen 120 mgTrough Concentrations (Ctrough) of Three Dose Levels of FesomersenVisit 120.001186 μg/mLGeometric Coefficient of Variation 76.691406

Source: ClinicalTrials.gov · Data processed: Feb 8, 2026