Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
  • A61K31/7088—Compounds having three or more nucleosides or nucleotides
  • A61K31/7105—Natural ribonucleic acids, i.e. containing only riboses attached to adenine, guanine, cytosine or uracil and having 3'-5' phosphodiester links
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
  • A61K31/7088—Compounds having three or more nucleosides or nucleotides
  • A61K31/713—Double-stranded nucleic acids or oligonucleotides
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
  • A61K31/7042—Compounds having saccharide radicals and heterocyclic rings
  • A61K31/7052—Compounds having saccharide radicals and heterocyclic rings having nitrogen as a ring hetero atom, e.g. nucleosides, nucleotides
  • A61K31/7056—Compounds having saccharide radicals and heterocyclic rings having nitrogen as a ring hetero atom, e.g. nucleosides, nucleotides containing five-membered rings with nitrogen as a ring hetero atom
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P7/00—Drugs for disorders of the blood or the extracellular fluid
  • A61P7/04—Antihaemorrhagics; Procoagulants; Haemostatic agents; Antifibrinolytic agents

Definitions

• Hemophilia A and B are inherited bleeding disorders characterized by the body’s inability to control blood clotting. They are caused by deficiencies in factors VIII and IX, respectively. Bleeding in hemophilia A and B arises from insufficient thrombin generation (Peyvandi et al., Lancet (2016) 388(10040):187-97).
• Factor replacement is also limited by difficulties with venous access and risk of infections (Balkaransingh and Young, Ther Adv Hematol. (2016) 9(2):49-61; Valentino et al., BloodRev. (2011) 25(1): 11- 5). Limitations in delivering factor replacement also result in a large proportion of the world’s hemophilia population without access in the first instance to prophylaxis treatment (Hemophilia, W.F.O. Treatment Safety and Supply . 2020).
• ITI immune tolerance induction
• BPAs prophylaxis with bypassing agents
• aPCC activated prothrombin complex concentrates
• rFVIIa recombinant activated factor VII
• the one or more QoL domains are domains in a QoL questionnaire.
• the QoL questionnaire is Haemophilia Quality of Life Questionnaire for Adults (Haem-A-QoL).
• the administering results in a clinically meaningful improvement indicated by a reduction of 7 or more units (optionally 8 or more, 9 or more, or 10 or more units) in one or more of Total Score, Sports and Leisure domain score, and Physical Health domain score of Haem-A-QoL.
• the QoL qquestionnaire is pediatric Hemophilia Activities List (pedHAL).
• the administering results in an improvement indicated by an increase of 7 or more units (optionally 8 or more, 9 or more, or 10 or more units) in the Total Score of pedHAL.
• the patient is with inhibitors, optionally wherein the level of inhibitors is more than 0.6 BU/mL as determined by Bethesda inhibitor assay.
• the BPA is activated prothrombin complex concentrates (aPCC) and/or recombinant activated Factor VII (rFVIIa).
• the patient is without inhibitors.
• FIG. 4 is a diagram showing the participant disposition of patients enrolled in the Phase 3 clinical trial of fitusiran in Hemophilia A and B patients with inhibitors.
• FIG. 5 is a bar graph showing the important aspects of hemophilia treatment as determined according to patient exit interviews.
• FIG. 7 is a line graph showing the mean antithrombin levels in patients with inhibitors treated with fitusiran.
• FIG. 10 is a line graph showing thrombin generation in patients without inhibitors treated with fitusiran.
• FIG. 12 shows the median observed ABR for patients treated with fitusiran.
• the present disclosure features methods of using fitusiran for routine prophylaxis to prevent or reduce the frequency of bleeding episodes in patients with hemophilia, such as hemophilia A (congenital factor VIII deficiency) or hemophilia B (congenital factor IX deficiency), with or without inhibitors.
• hemophilia such as hemophilia A (congenital factor VIII deficiency) or hemophilia B (congenital factor IX deficiency)
• the patient is an adult or adolescent > 12 years old.
• HRQOL health-related quality of life
• Fitusiran is a synthetically, chemically modified double-stranded small interfering RNA (siRNA) oligonucleotide covalently linked to a tri-antennary N-acetyl-galactosamine (GalNAc) ligand targeting the AT3 mRNA in the liver, thereby suppressing the synthesis of antithrombin.
• siRNA small interfering RNA
• GalNAc tri-antennary N-acetyl-galactosamine
• the nucleosides in each strand of fitusiran are connected through either 3 ’-5’ phosphodiester or phosphorothioate linkages, thus forming the sugar-phosphate backbone of the oligonucleotide.
• the sense strand and the antisense strand of fitusiran contain 21 and 23 nucleotides, respectively.
• the 3 ’-end of the sense strand is conjugated to the GalNAc containing moiety (referred to as L96) through a phosphodiester linkage.
• the sense strand contains two consecutive phosphorothioate linkages at its 5’ end.
• the antisense strand contains four phosphorothioate linkages, two at the 3’ end and two at the 5’ end.
• the 21 nucleotides of the sense strand hybridize with the complementary 21 nucleotides of the antisense strand, thus forming 21 nucleotide base pairs and a two-base overhang at the 3’-end of the antisense strand.
• Gf 2’-fluoroguanosine (i.e., 2’-deoxy-2’-fluoroguanosine)
• the pharmaceutical composition may be provided in a container (e.g., a vial or a syringe).
• the container may contain single or multiple doses.
• the container is a single-use container (e.g., a single-use ampule or a single-use syringe, such as a single-use pre-filled syringe), with each container containing about 10 to about 100 mg fitusiran (e.g., about 10 mg, about 20 mg, about 25 mg, about 40 mg, about 50 mg, or about 80 mg).
• Fitusiran can suppress liver production of antithrombin (AT).
• AT antithrombin
• FXa FXa
• Fitusiran may be used to treat those who have impaired hemostasis.
• HRQoL in adolescent patients (12 years or older to 17 years old) can be measured by, e.g., Haemophilia Quality of Life Questionnaire for teenagers (Haemo-QoL) (See, e.g., Bullinger et al., Value Health. (2009) 12(5):808-20; and Remor, Int J Behav Med. (2013) 20(4):609-17) and the Pediatric Hemophilia Activities List (pedHAL).
• Haemophilia Quality of Life Questionnaire for teenagers See, e.g., Bullinger et al., Value Health. (2009) 12(5):808-20; and Remor, Int J Behav Med. (2013) 20(4):609-17
• pedHAL Pediatric Hemophilia Activities List
• the PRO instrument may be, for example, the Haemophilia Quality of Life Questionnaire for Adults (“Haem-A-QoL”; von Mackensen et al., Haematologica (2005) 90(s2): 115-6, Abstract 0290; Wyrwich et al., Haemophilia (2015) 21(5):578-84).
• HRQoL of adult patients is measured by scores in Haem-A-QoL. See, e.g., von Mackensen et al., Value in Health. (2005) 8(6): A127; von Mackensen et al., J Thrombosis and Haemostasis .
• the Haem-A-QoL questionnaire includes 46 items contributing to 10 domains, including Physical Health (5 items), Feeling (4 items), View of Self (5 items), Sports and Leisure (5 items), Work and School (4 items), Dealing with Hemophilia (3 items), Treatment (8 items), Future (5 items), Family Planning (4 items), and Partnership and Sexuality (3 items).
• a “Not Applicable” response option is also available for the domains of “Sports & Leisure,” “Work & School,” and “Family Planning” when the question does not apply to the participant.
• a “Total Score” is also used to represent the average of all 10 domains of the Haem-A-QoL questionnaire. Haem-A-QoL domain scores and the Total Score are transformed to a scale of 0-100 (using an instrument-specific scoring system) with higher scores representing greater impairment. A decrease in score relative to the corresponding baseline score (score before the treatment being evaluated) indicates an improvement in the patient’s quality of life.
• the present fitusiran therapy improves the score from at least one of the EQ-5D-5L dimensions (e.g., Mobility, Self-Care, Usual Activities, Pain/Discomfort, and Anxiety /Depression) from baseline.
• EQ-5D-5L dimensions e.g., Mobility, Self-Care, Usual Activities, Pain/Discomfort, and Anxiety /Depression
• the VAS score is increased by 1 or more units (e.g., 2 or more, 3 or more, 4 or more, 5 or more, 6 or more, 7 or more, 8 or more, 9 or more, 10 or more, 11 or more, 12 or more, 13 or more, 14 or more, 15 or more, 16 or more, 17 or more, 18 or more, 19 or more, or 20 or more units).
• the present fitusiran therapy improves the score from at least one of the TSQM-9 domains (i.e., Effectiveness, Convenience, and Global Satisfaction) from baseline.
• the present methods may improve the treatment satisfaction of hemophilia patients.
• the present methods improve subjective functional ability to perform activities of daily living as determined by well-designed, detailed questionnaires, including the Hemophilia Activities List (HAL) and Pediatric Hemophilia Activities List (pedHAL).
• HAL Hemophilia Activities List
• pedHAL Pediatric Hemophilia Activities List
• the present fitusiran therapy improves the score from at least one of the HAL or pedHAL domains (i.e., Lying Down/Sitting/Kneeling/Standing, Functions of the Legs, Functions of the Arms, Use of Transportation, Self Care, Household Tasks, Leisure Activities and Sport, Basic Lower Extremity Activities (HAL only), Upper Extremity Activities (HAL only), and Complex Lower Extremity Activities (HAL only)) from baseline.
• the present methods may improve the subjective functional ability to perform activities of daily living of hemophilia patients.
• kits comprising a pharmaceutical composition for use in the present treatment methods.
• kits include one or more vials or one or more pre-filled syringes comprising a pharmaceutical composition of the invention and instructions for use, e.g., instructions for administering a therapeutically effective amount of fitusiran.
• the kits may optionally further comprise means for administering fitusiran (e.g., an injection device), or means for measuring the inhibition of SERPINC1 (e.g., means for measuring the inhibition of SERPINC1 mRNA, expression of protein encoded by SERPENCI, and/or SERPINC1 activity).
• Such means for measuring the inhibition of SERPINC1 may comprise a means for obtaining a sample from a subject, such as, e.g., a plasma sample.
• the kits of the invention may optionally further comprise means for determining the therapeutically effective or prophylactically effective amount.
• the term “approximately” or “about” as applied to one or more values of interest refers to a value that is similar to a stated reference value. In certain aspects, the term refers to a range of values that fall within 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, or less in either direction (greater than or less than) of the stated reference value unless otherwise stated or otherwise evident from the context.
• back-references in the dependent claims are meant as short-hand writing for a direct and unambiguous disclosure of each and every combination of claims that is indicated by the back-reference.
• headers herein are created for ease of organization and are not intended to limit the scope of the claimed invention in any manner.
• This Example describes the Phase 3 clinical trials protocols used in studies of fitusiran administered subcutaneously to male patients having severe hemophilia A or B with or without inhibitors.
• Eligible patients were randomized in a 2: 1 ratio to the following arms: i. Fitusiran treatment arm', fitusiran 80 mg administered SC as prophylaxis once monthly, with use of on-demand BPA or factor concentrate for treatment of breakthrough bleeding episodes, and ii. On-demand arm', on-demand (OD) use of BPA or factor concentrate for treatment of breakthrough bleeding episodes.
• BPA or factor concentrate On-demand use of BPA or factor concentrate is defined as the use of these agents, as needed, for episodic bleeding episodes, and not on a regular regimen intended to prevent spontaneous bleeding.
• factors concentrate In the clinical trials, factor concentrate is also referred to as clotting factor concentrate (CFC).
• CFC clotting factor concentrate
• the overall fitusiran treatment period was defined as the onset period (Day 1 to Day 28 after receipt of the first dose, during which the AT lowering capacity of fitusiran is increasing but has not yet reached therapeutic levels) plus the efficacy period (Day 29 and after, when the AT lowering capacity of fitusiran has achieved therapeutic target range).
• the inclusion criteria were as follows: i. males >12 years of age, ii. severe hemophilia A or B with or without inhibitors evidenced by a central laboratory measurement or documented medical record evidence of F VIII ⁇ 1% or FIX level ⁇ 2% prior to treatment, and iii. a minimum of six bleeding episodes requiring BPA or factor concentrate treatment within the last six months prior to treatment.
• a patient with severe hemophilia A or B with inhibitors is evidenced by on- demand use of BP As to manage bleeding episodes for at least the last six months prior to treatment, and must meet at least one of the following Nijmegen-modified Bethesda assay results criteria: i. inhibitor titer of >0.6 BU/mL prior to treatment, or ii. inhibitor titer of ⁇ 0.6 BU/mL prior to treatment with medical record evidence of two consecutive titers >0.6 BU/mL, or iii. inhibitor titer of ⁇ 0.6 BU/mL prior to treatment with medical record evidence of anamnestic response.
• a patient with severe hemophilia A or B without inhibitors is evidenced by on- demand use of factor concentrate to manage bleeding episodes for at least the last six months prior to treatment, and must meet each of the following criterion: i. Nijmegen modified Bethesda assay inhibitor titer of ⁇ 0.6 BU/mL, ii. no use of BP As to treat bleeding episodes for at least the last six months, and iii. no history of immune tolerance induction therapy within the last six months.
• the key exclusion criteria were as follows: i. known co-existing bleeding disorders other than hemophilia A or B, i.e., Von Willebrand’s disease, additional factor deficiencies, or platelet disorders, ii.
• FibroScan ⁇ 12.5 kPa (where available), or b. FibroTest score ⁇ 0.75 and APRI ⁇ 2 (if FibroScan unavailable), vi. presence of acute hepatitis, i.e., hepatitis A or hepatitis E, vii. presence of acute or chronic hepatitis B infection (IgM anti-HBc antibody positive or HBs Ag positive), viii. platelet count ⁇ 100, 000/pL, ix. presence of acute infection prior to treatment, x. known to be HIV positive with CD4 count ⁇ 200 cells/pL, xi. estimated glomerular filtration rate ⁇ 45 mL/min/1.73 m 2 (using the Modification of Diet in Renal Disease [MDRD] formula), xii. co-existing thrombophilic disorder, as determined by presence of any of:
• prothrombin mutation G20210A; homozygous or heterozygous
• xiii history of antiphospholipid antibody syndrome
• xiv history of arterial or venous thromboembolism
• atrial fibrillation significant valvular disease
• myocardial infarction angina
• transient ischemic attack or stroke (except patients who have experienced thrombosis associated with indwelling venous access)
• xv. malignancy within two years prior to treatment except for basal or squamous cell carcinoma of the skin that has been successfully treated, xvi.
• the baseline demographics of patients treated in each study are shown in Table 2.
• the baseline demographics are for the intent-to-treat (ITT) analysis set (i.e., all randomized patients).
• ITT intent-to-treat
• Fitusiran (SAR439774) solution for injection was supplied as a sterile solution. Patients randomized to the fitusiran treatment arm received open-label 80 mg fitusiran as an SC injection once monthly, for a total of nine months.
• Example 2 Improvement of Patient Reported Outcomes by Fitusiran Treatment
• An objective of the Phase 3 clinical trial studies of fitusiran was to evaluate patient-reported outcomes (PROs) to assess health-related quality of life (HRQOL), physical activity, and perception of treatment.
• the age of the patient at randomization determined which age-specific questionnaires was utilized, which remain in force for the full study duration.
• HAL Hemophilia Activity List
• EOS end of study
• Haem-A-QoL was provided to participants >17 years of age. Scoring for each item is based on a five-point Likert scale (never, rarely, sometimes, often, and all the time), and higher scores represent greater impairment. Negative values denote health-related quality of life (HRQoL) improvement. Changes from baseline to Day 253 in Haem-A-Qol by domain are reported in Table 3 below.
• the Haemo-QoL questionnaires is a psychometrically tested QoL assessment instruments for participants with hemophilia aged ⁇ 17 years.
• the Haemo-QoL questionnaires and proxy -versions are adapted from the original adult Haem-A-QoL for adolescents and children. Negative values denote hemophilia-related quality of life (HRQoL) improvement. Results of Haemo-QoL by domain and study are presented in Table 5.
• Fitusiran patients generally reported improvements in all domains, with the exception of the domain of Friends in the study of patients with inhibitors and the domains of Friends and Sports in the study of patients without inhibitors. In both cases, total scores of Haemo-QoL displayed improvements in patients who received fitusiran.
• HAL Hemophilia Activity List
• HAL scores assess subjective functional ability to perform activities of daily living (e.g., activities involving the upper and lower extremities, basic activities involving the lower extremities, and complex activities involving the lower extremities). Scores range from 0 to 100, with higher scores denoting fewer functional limitations. Results of HAL by domain and study are presented in Table 6. Table 6. Mean Changes in HAL by Domain and Study
• TQM-9 Treatment Satisfaction Questionnaire for Medication Version 9
• the TSQM-9 is a validated psychometric tool that provides a general measure of patient-reported perception of medication, and covers the domains Effectiveness, Convenience, and Global Satisfaction. Domain scores are ranged from 0 to 100, with higher scores denoting improved HRQoL. Results of TSQM-9 by domain and study are presented in Table 8. Table 8. Mean Changes in TSQM-9 by Domain and Study
• the EQ-5D-5L is a standardized and disease-generic instrument for use as a measure of QoL outcome. It consists of a questionnaire pertaining to five dimensions (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression). Scoring of the questionnaire is based on five degrees of disability (none, slight, moderate, severe, or extreme) with a 0 (worst imaginable health state) to 1 (better health state) scale. Higher scores indicate better health status.
• EQ VAS is a continuous score ranging from 0 to 100.
• Scoring of the visual analog scale is based on a visual scale ranging from 0 (worst imaginable health state) to 100 (best imaginable health state). Results of EQ-5D-5L total score and VAS score are presented in Table 9.
• FIGs. 5 and 6 reflect an interim analysis conducted on the first ten interviews. Eight patients with hemophilia A or B and two caregivers were interviewed. All participants rated improving joint health as extremely important; most participants rated decreasing bleeds (90%), protection from bleeds for an entire month (90%), improving joint mobility (90%), prevention of fear/anxiety of bleeds (80%) and minimizing anxiety/stress in managing hemophilia (80%) as “extremely important” aspects in their hemophilia treatment (FIG. 5). All participants reported improvements in these treatment aspects while under fitusiran prophylaxis. In particular, 100%, 100%, 90%, 100%, 90% and 80% of patients rated having “a lot of improvement,” respectively, in each of these aspects (FIG.
• Example 3 Improvement of Additional Clinical Endpoints by Fitusiran Treatment Antithrombin Levels and Thrombin Generation
• 2 participants experienced TEAEs that resulted in fitusiran discontinuation (cholecystitis and ALT increased, in 1 participant each).
• Fitusiran prophylaxis resulted in sustained protection from bleeds in people with hemophilia A or B, with or without inhibitors (FIGs. 12 and 13).
• the median ABR in each fitusiran treatment arm was 0.0.
• Example 5 Efficacy and Safety of Fitusiran Prophylaxis in People with Hemophilia A or B with Inhibitors (ATLAS-INH)
• Eligible participants were males aged >12 years with severe hemophilia A (defined by a central laboratory measurement or documented medical record evidence of F VIII ⁇ 1% at screening) or hemophilia B (FIX ⁇ 2%) and with inhibitory antibodies to FVIII or FIX (defined as Nijmegen-modified Bethesda assay >0.6 Bethesda units/mL at screening) who had experienced > 6 bleeding episodes requiring on-demand BPA treatment within six months prior to screening.
• severe hemophilia A defined by a central laboratory measurement or documented medical record evidence of F VIII ⁇ 1% at screening
• hemophilia B FIX ⁇ 2%
• inhibitory antibodies to FVIII or FIX defined as Nijmegen-modified Bethesda assay >0.6 Bethesda units/mL at screening
• Eligible participants were randomized 2: 1 to receive once-monthly 80 mg subcutaneously administered (0.8mL) fitusiran prophylaxis, with use of BPA on-demand for the treatment of breakthrough bleeds, or to continue with on-demand BP As for the treatment of bleeding episodes. Participants were assigned to study groups by stratified permuted block randomization (block size of 3). On-demand use of BP As was defined as the use of these agents, as needed, for episodic bleeding events (Table 13). Randomization was stratified by the number of bleeding episodes in the six months before screening ( ⁇ 10 vs >10). The investigator or his/her delegate contacted the interactive response system after confirming that the participant fulfilled all inclusion criteria. The trial was open label, with both participants and investigators aware of treatment assignment.
• the trial consisted of several periods: the onset period, from Days 1 to 28, during which fitusiran gradually reached the target pharmacodynamic effect of antithrombin lowering (Pasi et al., N Engl J Med (2017) 377(9):819-28); the efficacy period, from day 29 up to day 246, and the treatment period that consisted of both the onset and efficacy periods.
• the follow-up period lasted from one to six months, until antithrombin levels returned to approximately 60% following the final dose or until enrolment into an open-label extension study.
• a treated bleeding episode was defined as any occurrence of hemorrhage that required administration of BPAs.
• the definitions of bleeding episode types were according to the recommendations of the International Society on Thrombosis and Hemostasis (Table 14) Table 14. Definitions of Bleeding Episodes
• HRQoL Health-related quality of life
• Safety assessments consisted of treatment-emergent adverse events (TEAEs), including treatment-emergent serious adverse events (TESAEs) and treatment-emergent adverse events of special interest (TEAESIs); physical examinations, including vital signs and electrocardiograms; and laboratory tests, including markers of coagulation.
• TEAEs treatment-emergent adverse events
• TESAEs treatment-emergent serious adverse events
• TEAESIs treatment-emergent adverse events of special interest
• physical examinations including vital signs and electrocardiograms
• laboratory tests including markers of coagulation.
• antithrombin activity levels were measured from blood samples collected within four hours before dosing and monitored at monthly intervals from day 1 until returning to an approximate activity level of 60% after the final fitusiran dose (unless participants opted to continue fitusiran in an open-label extension study). Thrombin generation was also assessed at monthly intervals.
• Antidrug antibodies (ADA) to fitusiran were measured from serum blood samples collected within 4 hours of treatment administration on day 1, months 1 and 3, and at end of treatment using a validated enzyme linked immunosorbent assay method.
• the primary efficacy endpoint was ABR in the efficacy period.
• ABR was defined as the number of qualifying bleeding episodes divided by the total number of days in the efficacy period multiplied by 365.25.
• Pre-specified subgroup analyses of the primary endpoint were performed according to hemophilia type (Type A vs B), number of bleeding episodes during the 6 months prior to study ( ⁇ 10 vs >10) and age group ( ⁇ 18, 18-64, >65 years) in the efficacy period.
• Secondary endpoints included ABR in the treatment period, annualized spontaneous bleeding rate (AsBR) in the efficacy period, and annualized joint bleeding rate (AjBR) in the efficacy period. Change from baseline in Haem-A-QoL physical health domain and total score in the treatment period were also assessed as a secondary endpoint.
• TEAESIs were pre-defined as alanine aminotransferase (ALT) or aspartate aminotransferase elevations (AST) >3 x upper limit of normal (ULN), suspected or confirmed thrombosis, severe or serious injection site reactions, and systemic injection- associated reactions.
• ALT alanine aminotransferase
• AST aspartate aminotransferase elevations
• UPN upper limit of normal
• Pre-specified exploratory endpoints included number of target joint bleeding episodes in the efficacy period, pharmacokinetic and pharmacodynamic effects of fitusiran (including antithrombin activity and thrombin generation), and incidence and titer of ADA in the fitusiran prophylaxis group. There was no allowance for multiplicity for the exploratory outcomes.
• the number of bleeding episodes in the efficacy period was analyzed using a negative binomial model with fixed effects of treatment group and the number of bleeding episodes in the six months prior to study entry ( ⁇ 10 vs >10).
• the logarithm number of days that each participant spent in the efficacy period matching the bleeding episode data being analyzed was included as an offset variable to account for unequal follow-up time due to early withdrawal, surgery, etc.
• the estimated mean ABR in both treatment groups along with their 95% confidence intervals (Cis) were presented from this model. Summary statistics for ABR, including median and IQR, were also calculated for each group. Sensitivity analyses were performed for the efficacy outcomes.
• LS least square
• the median AsBRs were 0.0 (IQR: 0.0, 0.0) and 13.4 (IQR: 3.4, 21.8) in the fitusiran prophylaxis and BPA on-demand groups, respectively.
• IQR: 0.0, 0.0 IQR: 3.4, 21.8
• a greater proportion of participants in the fitusiran prophylaxis group had zero spontaneous bleeds (76%) versus the BPA on-demand group (11%).
• Median AjBRs were 0.0 (IQR: 0.0, 1.7) and 11.7 (IQR: 3.4, 16.8) in the fitusiran prophylaxis and BPA on-demand groups, respectively.
• an event of thrombosis (suspected spinal vessel thrombosis) was assessed by the investigator as serious and possibly related to the study drug, resulting in discontinuation of fitusiran prophylaxis.
• Steady state antithrombin values in this participant prior to event onset ranged from 7.8% to 11.6%.

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