Treatment of Thrombocytopenia in Patients With Chronic Liver Disease Undergoing an Elective Procedure

Study Overview
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Brief Summary
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This is a global, multicenter, randomized, double-blind, placebo-controlled, parallel group study using avatrombopag to treat adults with thrombocytopenia associated with liver disease. The study will evaluate avatrombopag in the treatment of thrombocytopenia associated with liver disease prior to an elective procedure to reduce the need for platelet transfusions or any rescue procedure for bleeding due to procedural and post-procedural bleeding complications. Participants will be enrolled into 2 cohorts according to mean baseline platelet count and, within each baseline platelet count cohort will be further stratified by risk of bleeding associated with the elective procedure (low, moderate, or high) and hepatocellular carcinoma (HCC) status (Yes or No).

Detailed Description
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This study will consist of 3 phases: Prerandomization, Randomization, and a Follow-up Phase. The Prerandomization Phase includes one Screening Visit that will take place from Day -14 through Day -1; the Randomization Phase includes the Baseline Period, Treatment Period, and Procedure Day Period (5 to 8 days after last dose of study drug [Study Day 10 to 13]). The Follow-up Phase comprises 2 visits: 7 days post Procedure Day and 30 days after receiving the last dose of study drug. Permitted procedures include: Paracentesis; Thoracentesis; Gastrointestinal endoscopy with or without plans for biopsy, colonoscopy, polypectomy, or variceal banding; Liver biopsy; Bronchoscopy with or without plans for biopsy; Ethanol ablation therapy or chemoembolization for HCC; Vascular catheterization (including right side procedures in participants with pulmonary hypertension); Transjugular intrahepatic portosystemic shunt; Dental procedures; Renal biopsy; Biliary interventions; Nephrostomy tube placement; Radiofrequency ablation; and Laparoscopic interventions.

Official Title
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A Randomized, Global, Double-blind, Placebo-controlled, Parallel-group Study to Evaluate the Efficacy and Safety of Once-daily Oral Avatrombopag for the Treatment of Adults With Thrombocytopenia Associated With Liver Disease Prior to an Elective Procedure

Conditions
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Thrombocytopenia Associated With Liver Disease

Intervention / Treatment
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* Drug: avatrombopag (lower baseline platelet count)
* Drug: placebo (lower baseline platelet count)
* Drug: avatrombopag (higher baseline platelet count)
* Drug: placebo (higher baseline platelet count)


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria Participants greater than or equal to 18 years of age at Screening with chronic liver disease Participants who have a mean baseline platelet count of less than 50 x 10^9/L. Platelet counts must be measured on 2 separate occasions, during the Screening Period and at Baseline, and must be performed at least one day apart with neither platelet count greater than 60 x 10^9/L. The mean of these 2 platelet counts (mean baseline platelet count) will be used for entry criteria and for assignment to the low or high baseline platelet count cohort. Participants scheduled to undergo a permitted elective procedure who, in the opinion of the investigator, will require a platelet transfusion to address a risk of bleeding associated with the procedure unless there is a clinically significant increase in platelet count from baseline Model For End-stage Liver Disease (MELD) score less than or equal to 24 at Screening If taking inhibitors of P glycoprotein (P-gp), except for verapamil, dose must be stable for 7 days prior to Screening Provide written informed consent Willing and able to comply with all aspects of the protocol Exclusion Criteria Any history of arterial or venous thrombosis, including partial or complete thrombosis Evidence of thrombosis (partial or complete) in the main portal vein, portal vein branches, or any part of the splenic mesenteric system at Screening Portal vein blood flow velocity rate <10 centimeters/second at Screening Hepatic encephalopathy that cannot be effectively treated Participants with HCC with Barcelona Clinic Liver Cancer (BCLC) staging classification C or D Platelet transfusion or receipt of blood products containing platelets within 7 days of Screening. However packed red blood cells are permitted. Heparin, warfarin, nonsteroidal anti-inflammatory drugs (NSAID), aspirin, verapamil, and antiplatelet therapy with ticlopidine or glycoprotein IIb/IIIa antagonists (eg, tirofiban) within 7 days of Screening Use of erythropoietin stimulating agents within 7 days of Screening Interferon (IFN) use within 14 days of Screening Estrogen-containing hormonal contraceptive or hormone replacement therapy use within 30 days of Screening Active infection requiring systemic antibiotic therapy within 7 days of Screening. However, prophylactic use of antibiotics is permitted. Alcohol abuse, alcohol dependence syndrome, drug abuse, or drug dependence within 6 months of the study start (unless participating in a controlled rehabilitation program) or acute alcoholic hepatitis (chronic alcoholic hepatitis is allowed) within 6 months of the study start Elective procedure performed prior to Visit 4 (Procedure Day) Known to be human immunodeficiency virus positive Any clinically significant acute or active bleeding (eg, gastrointestinal, central nervous system) Known history of any primary hematologic disorder (eg, immune thrombocytopenic purpura, myelodysplastic syndrome) Known medical history of genetic prothrombotic syndromes (eg, Factor V Leiden; prothrombin G20210A; ATIII deficiency, etc.) Participants with a history of significant cardiovascular disease (eg, congestive heart failure New York Heart Association Grade III/IV, arrhythmia known to increase the risk of thromboembolic events [eg, atrial fibrillation], coronary artery stent placement, angioplasty, and coronary artery bypass grafting) Females of childbearing potential who have had unprotected sexual intercourse within 30 days before study entry and who do not agree to use a highly effective method of contraception (eg, total abstinence, an intrauterine device, a double-barrier method [such as condom plus diaphragm with spermicide], a progesterone-only contraceptive implant/injection, or have a vasectomized partner with confirmed azoospermia) throughout the entire study period and for 30 days after study drug discontinuation. If currently abstinent, the participant must agree to use a double-barrier method as described above if she becomes sexually active during the study period or for 30 days after study drug discontinuation. All females will be considered to be of childbearing potential unless they are postmenopausal (at least 12 months consecutive amenorrhea in the appropriate age group and without other known or suspected cause) or have been sterilized surgically (ie, bilateral tubal ligation, hysterectomy, or bilateral oophorectomy) at least 1 month before dosing. Females who are lactating or pregnant at Screening or Baseline (as documented by a positive serum beta-human chorionic gonadotropin [B-hCG] test with a minimum sensitivity 25 IU/L or equivalent units of B-hCG). A separate baseline assessment is required if a negative screening pregnancy test was obtained more than 72 hours before the first dose of study drug. Post liver transplant subjects Any participant who has previously received avatrombopag Hypersensitivity to avatrombopag maleate or any of its excipients Hemoglobin levels ≤ 8.0 or ≥ 18.0 g/dL for men and > 15 for women at Screening, with hematocrit ≥ 54% for men and ≥ 45% for women Current malignancy including solid tumors and hematologic malignancies (except HCC) Any history of concomitant medical condition that, in the opinion of the investigator(s), would compromise the participant's ability to safely complete the study Currently enrolled in another clinical trial with any investigational drug or device within 30 days of Screening

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Group A (avatrombopag, lower baseline platelet count)<br>60 mg avatrombopag (3 x 20 mg tablets) once daily on Days 1 through 5 | Drug: avatrombopag (lower baseline platelet count)<br>* 60 mg avatrombopag (3 x 20 mg tablets)<br>|
| Placebo Comparator: Group B (placebo, lower baseline platelet count)<br>placebo (3 x 20 mg matching placebo tablets) once daily on Days 1 through 5 | Drug: placebo (lower baseline platelet count)<br>* 60 mg placebo (3 x 20 mg matching placebo tablets)<br>|
| Experimental: Group C (avatrombopag, higher baseline platelet count)<br>40 mg avatrombopag (2 x 20 mg tablets) once daily on Days 1 through 5 | Drug: avatrombopag (higher baseline platelet count)<br>* 40 mg avatrombopag (2 x 20 mg tablets)<br>|
| Placebo Comparator: Group D (placebo, higher baseline platelet count)<br>placebo (2 x 20 mg matching placebo tablets) once daily on Days 1 through 5 | Drug: placebo (higher baseline platelet count)<br>* 40 mg placebo (2 x 20 mg matching placebo tablets)<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Percentage of Participants Who Did Not Require a Platelet Transfusion After Randomization and up to 7 Days Following a Scheduled Procedure | Responders were defined as participants who did not require a platelet transfusion or any rescue procedure for bleeding after randomization and up to 7 days following a scheduled procedure. Participants with missing information due to early withdrawal or other reasons were conservatively considered as having received a transfusion in the analysis, (i.e. a Non-responder). | Randomization (Visit 2), up to 7 Days following a scheduled procedure | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Percentage of Participants Who Achieved a Platelet Count Greater Than or Equal to 50 x 10^9/L on Scheduled Procedure Day | Responders were defined as participants who achieved a platelet count greater than or equal to 50 x 10^9/L on the procedure day. Participants missing a platelet count on the procedure day were conservatively considered as not achieving a platelet count of 50x10^9/L in the analysis, (i.e. Non-responders). | Day 10 to Day 13 (Visit 4) | 
| Change From Baseline in Platelet Counts on Scheduled Procedure Day | Last observation carried forward was used for participants with a missing platelet count on the scheduled procedure day. Platelet count was measured preprocedure and before any platelet transfusion. | Baseline (Visit 2) to Procedure Day 10 to Day 13 (Visit 4) | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Thrombocytopenia, Chronic Liver Disease