A Study of Avatrombopag for the Treatment of Thrombocytopenia in Patients with Chronic Liver Disease Undergoing an Elective Procedure


About this study

The purpose of this study is to evaluate the safety and effectiveness of using avatrombopag to treat adults with 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.

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. There is no guarantee that every individual who qualifies and wants to participate in a trial will be enrolled. Contact the study team to discuss study eligibility and potential participation.

Inclusion Criteria

  • ≥ 18 years of age at screening
  • Have chronic liver disease
  • Have a mean baseline platelet count of < 50 x 109/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 > 60 x 109/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
  • Scheduled to undergo a permitted elective procedure and 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 change in platelet count from baseline
  • Model For End-stage Liver Disease (MELD) score ≤ 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
  • Adequate portal vein blood flow 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
    • Packed red blood cells are permitted
  • Within 7 days of screening no
    • Heparin
    • Warfarin
    • Nonsteroidal anti-inflammatory drugs (NSAID)
    • Aspirin
    • Verapamil
    • Antiplatelet therapy with ticlopidine or glycoprotein IIb/IIIa antagonists (eg, tirofiban)
  • 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
    • Prophylactic use of antibiotics is permitted
  • Within 6 months of the study start (unless participating in a controlled rehabilitation program), no
    • Alcohol abuse
    • Alcohol dependence syndrome
    • Drug abuse
    • Drug dependence  
  • Acute alcoholic hepatitis within 6 months of the study start (chronic alcoholic hepatitis is allowed)
  • 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.)
  • 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 
  • Females of childbearing potential who do not agree to use a highly effective method of contraception throughout the entire study period and for 30 days after study drug discontinuation eg
    • Total abstinence
      • Must agree to use a double-barrier method if she becomes sexually active during the study period or for 30 days after study drug discontinuation
    • An intrauterine device
    • A double-barrier method such as condom plus diaphragm with spermicide
    • A progesterone-only contraceptive implant/injection
    • Have a vasectomized partner with confirmed azoospermia  
    • 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) 
      • 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
  • 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

Participating Mayo Clinic locations

Study statuses change often. Please contact the study team for the most up-to-date information regarding possible participation.

Mayo Clinic Location Status

Jacksonville, Fla.

Mayo Clinic principal investigator

Raj Satyanarayana, M.D.

Closed for enrollment

More information


Publications are currently not available

Study Results Summary

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Supplemental Study Information

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Additional contact information

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