LR769 in Congenital Hemophilia Patients With Inhibitors Undergoing Elective Surgery or Invasive Procedures

Inclusion Criteria: Each patient must meet the following criteria to be enrolled in this study: 1. be male with a diagnosis of congenital hemophilia A or B of any severity 2. have one of the following: 1. a positive inhibitor test Bethesda Unit (BU) ≥5 (as confirmed at screening by the institutional lab), OR 2. a BU \<5 but expected to have a high anamnestic response to FVIII or FIX, as demonstrated from the patient's medical history, precluding the use of FVIII or FIX products to treat or prevent bleeding, OR 3. a BU \<5 but expected to be refractory to increased dosing of FVIII or FIX, as demonstrated from the patient's medical history, precluding the use of FVIII or FIX products to treat or prevent bleeding episodes 3. be ≥6 months to ≤75 years of age; different age restrictions may apply per local regulation and ethical considerations (enrollment of children \<12 years of age will not begin until after review of data from the PERSEPT 2 study by the DMC) 4. be scheduled for an elective surgical or other invasive procedure 5. be capable of understanding and willing to comply with the conditions of the protocol OR in the case of a patient \<18 years of age, parent(s)/legal guardian(s) must be capable of understanding and willing to comply with the conditions of the protocol 6. have read, understood, and provided written Informed Consent (patient and/or parent(s)/legal guardian(s) if the patient is \<18 years of age) or Assent, if applicable Exclusion Criteria: Patients who meet any of the following criteria will be excluded from the study: 1. have any coagulation disorder other than hemophilia A or B 2. be immunosuppressed (ie, the patient should not be receiving systemic immunosuppressive medication; cluster of differentiation 4 (CD4) counts at screening should be \>200/µL) 3. known intolerance to LR769 or any of its excipients 4. currently receiving immune tolerance induction (ITI) therapy 5. have a known allergy or hypersensitivity to rabbits 6. have a platelet count\<100,000/µL 7. have received an investigational drug within 30 days of the planned first LR769 administration , or is expected to receive such drug during participation in this study (with the exception of patients who are or were participating in another LR769 study, eg, a study assessing the treatment of bleeding episodes with LR769) 8. have a clinically relevant hepatic (aspartate aminotransferase (AST) and/or alanine aminotransferase (ALT) \>3 times the upper limit of normal (ULN)) and/or renal impairment (creatinine \>2 times the ULN) 9. have a history of arterial and/or venous thromboembolic events (such as myocardial infarction, ischemic strokes, transient ischemic attacks, deep venous thrombosis (DVT) or pulmonary embolism (PE)) within 2 years prior to the planned first dose of LR769, uncontrolled arrhythmia, or current New York Heart Association (NYHA) functional classification score of stages II - IV 10. have an active malignancy (those with non-melanoma skin cancer are allowed) 11. have any life-threatening disease or other disease or condition which, according to the investigator's judgment, could imply a potential hazard to the patient, or interfere with the trial participation or trial outcome (eg, a history of non-responsiveness to bypassing products) 12. be using aspirin, NSAIDS, herbs, natural medications, or other drugs with platelet inhibitory properties within one week prior to surgery and for the duration of treatment with LR769 13. have active gastric or duodenal ulcer disease