Exploring the Efficacy, Safety of a Modified Starting Dosage of Avatrombopag in Immune Throbocytopenia (ITP) - a Pilot Study

NCT07133659 | Recruiting Phase 4

• 1 other identifier: RGHC007
• Study Type: interventional
• Target: 25
• Locations: 1 country
• Sites: 1

Brief Summary

This is a single-center, open label pilot trial where patients with primary ITP who require second line treatment will be offered avatrombopag at a reduced starting dose, adjusted thereafter according to the response and continued for up to 24 weeks. The study aims to acquire experience on use of avatrombopag and explore the efficacy and safety of lower starting dose of avatrombopag

Conditions

ITP - Immune Thrombocytopenia

Keywords

ITP; thrombocytopenia; Avatrombopag; thrombopoietin receptor agonist

Outcome Measures

Primary Outcomes (1)

• Total Response Time

  Median cumulative number of weeks with platelet count \>50 x 109/L from time of Avatrombopag initiation to end of week 20. A period of 2 week will be deducted after IVIG and 4 weeks after dexamethasone.

  20 weeks

Secondary Outcomes (9)

• TTR

  20 weeks

• Response by day 8

  8 days

• Rates of platelet overshoot.

  6 weeks

• Durable response rate.

  20 weeks

• The rates of treatment failure.

  20 weeks

Study Arms (1)

Avatrombopag

EXPERIMENTAL

Description: Patients will start on avatrombopag 20 mg every other day for a week then the dose will be readjusted according to the platelet count.

Drug: Avatrombopag 20 mg Oral Tablet

Interventions

Avatrombopag 20 mg Oral Tablet DRUG

Description: Patients will start on avatrombopag 20 mg every other day for a week then the dose will be readjusted according to the platelet count.

Avatrombopag

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Male or female aged ≥18 years.
• Clinical need for second (subsequent) line treatment with a platelet elevating therapy assessed by the physician in charge.
• Signed and dated written informed consent.

You may not qualify if:

• Previous treatment with TPO-RA.
• Pregnancy or lactation.
• Patients with active serious bleeding or at high risk of bleeding as judged by physician in charge.
• Females of child-bearing potential refusing to follow effective contraceptive methods (as described in SmPC) during treatment with Avatrombopag.
• Secondary ITP defined as ITP secondary to lymphoma or chronic lymphocytic leukemia; ITP secondary to the following autoimmune disorders Systemic Lupus Erythematosus or Antiphospholipid Syndrome; ITP secondary to Common Variable Immune Deficiency; ITP secondary to the following viral infections eg Human Immunodeficiency Virus.
• Concomitant autoimmune hemolytic anemia, Evans syndrome.
• Presence of any serious comorbidity where the condition may worsen the study drugs.
• Presence of active malignancy unless deemed cured by adequate treatment. Participants with the following neoplastic conditions can be included:
• Monoclonal gammopathy of undetermined significance (MGUS) or monoclonal B lymphocytosis of undetermined significance (MBUS)
• Basal/squamous cell carcinoma of the skin
• Carcinoma in situ of the cervix
• Carcinoma in situ of the breast
• Incidental histological finding of prostate cancer (TNM stage T1a or T1b)
• Patients with history of poor compliance or history of alcohol/drug abuse or excessive alcohol beverage consumption that would interfere with the ability to comply with the study protocol, or current or past psychiatric disease that might interfere with the ability to comply with the study protocol or give informed consent.

Sponsors & Collaborators

• Al-Mustansiriyah University: lead

Study Sites (1)

hematology center / Medical City

Baghdad, 10016, Iraq

RECRUITING

Related Publications (12)

• Guillet S, Crickx E, Azzaoui I, Chappert P, Boutin E, Viallard JF, Riviere E, Gobert D, Galicier L, Malphettes M, Cheze S, Lefrere F, Audia S, Bonnotte B, Lambotte O, Noel N, Fain O, Moulis G, Hamidou M, Gerfaud-Valentin M, Marolleau JP, Terriou L, Martis N, Morin AS, Perlat A, Le Gallou T, Roy-Peaud F, Robbins A, Lega JC, Puyade M, Comont T, Limal N, Languille L, Zarrour A, Luka M, Menager M, Belmondo T, Hue S, Canoui-Poitrine F, Michel M, Godeau B, Mahevas M. Prolonged response after TPO-RA discontinuation in primary ITP: results of a prospective multicenter study. Blood. 2023 Jun 8;141(23):2867-2877. doi: 10.1182/blood.2022018665.

  PMID: 36893453 BACKGROUND

• Pascual-Izquierdo C, Sanchez-Gonzalez B, Canaro-Hirnyk MI, Garcia-Donas G, Menor-Gomez M, Gil-Fernandez JJ, Monsalvo-Saornil S, de-Laiglesia A, Alvarez-Roman MT, Jarque-Ramos I, Llacer MJ, Pedrote-Amador B, Zafra-Torres D, Caparros-Miranda I, Ortuzar-Pasalodos A, Revilla-Calvo N, Bastida JM, Chica-Gullon E, Alvarellos M, Jimenez-Barcenas R, Bernat S, Martinez-Carballeira D, Lakhwani S, Lopez-Ansoar E, Moreno-Beltran ME, Lorenzo-Vizcaya A, Aguirre MA, Lasa-Eguialde M, Canet M, Gonzalez-Gascon-Y-Marin IT, Caballero-Navarro G, Cuesta A, Diaz-Lopez M, Arquero T, Moreno-Carbonell M, Mingot-Castellano ME; Spanish ITP Group (GEPTI) of the Spanish Society of Hematology and Hemotherapy (SEHH). Avatrombopag in immune thrombocytopenia: A real-world study of the Spanish ITP Group (GEPTI). Am J Hematol. 2024 Dec;99(12):2328-2339. doi: 10.1002/ajh.27498. Epub 2024 Oct 12.

  PMID: 39394928 BACKGROUND

• Virk ZM, Leaf RK, Kuter DJ, Goodarzi K, Connell NT, Connors JM, Al-Samkari H. Avatrombopag for adults with early versus chronic immune thrombocytopenia. Am J Hematol. 2024 Feb;99(2):155-162. doi: 10.1002/ajh.27080. Epub 2023 Dec 8.

  PMID: 38063420 BACKGROUND

• Yamaguchi H, Iino M, Kowata S, Yamamoto R, Yamanouchi J, Imamura Y, Kirito K, Yokoyama K, Ito T, Ishikawa T, Shiratsuchi M, Tomiyama Y, Kamiya H, Zhang J, Jamieson BD. A phase 3 study of the efficacy and safety of avatrombopag in Japanese adults with chronic immune thrombocytopenia. Int J Hematol. 2025 Oct;122(4):521-532. doi: 10.1007/s12185-025-04001-4. Epub 2025 May 20.

  PMID: 40392465 BACKGROUND

• Tarantino MD, Bussel JB, Lee EJ, Jamieson BD. A phase 3, randomized, double-blind, active-controlled trial evaluating efficacy and safety of avatrombopag versus eltrombopag in ITP. Br J Haematol. 2023 Aug;202(4):897-899. doi: 10.1111/bjh.18908. Epub 2023 Jun 20. No abstract available.

  PMID: 37339869 BACKGROUND

• Mei H, Zhou H, Hou M, Sun J, Zhang L, Luo J, Jiang Z, Ye X, Xu Y, Lu J, Wang H, Hui A, Zhou Y, Hu Y. Avatrombopag for adult chronic primary immune thrombocytopenia: a randomized phase 3 trial in China. Res Pract Thromb Haemost. 2023 Jul 26;7(6):102158. doi: 10.1016/j.rpth.2023.102158. eCollection 2023 Aug.

  PMID: 37700877 BACKGROUND

• Jurczak W, Chojnowski K, Mayer J, Krawczyk K, Jamieson BD, Tian W, Allen LF. Phase 3 randomised study of avatrombopag, a novel thrombopoietin receptor agonist for the treatment of chronic immune thrombocytopenia. Br J Haematol. 2018 Nov;183(3):479-490. doi: 10.1111/bjh.15573. Epub 2018 Sep 7.

  PMID: 30191972 BACKGROUND

• Matzdorff A, Alesci SR, Gebhart J, Holzhauer S, Hutter-Kronke ML, Kuhne T, Meyer O, Ostermann H, Pabinger I, Rummel M, Sachs UJ, Stauch T, Trautmann-Grill K, Wormann B. Expert Report on Immune Thrombocytopenia: Current Diagnostics and Treatment - Recommendations from an Expert Group from Austria, Germany, and Switzerland. Oncol Res Treat. 2023;46 Suppl 2:5-44. doi: 10.1159/000529662. Epub 2023 Feb 14. No abstract available.

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• Provan D, Arnold DM, Bussel JB, Chong BH, Cooper N, Gernsheimer T, Ghanima W, Godeau B, Gonzalez-Lopez TJ, Grainger J, Hou M, Kruse C, McDonald V, Michel M, Newland AC, Pavord S, Rodeghiero F, Scully M, Tomiyama Y, Wong RS, Zaja F, Kuter DJ. Updated international consensus report on the investigation and management of primary immune thrombocytopenia. Blood Adv. 2019 Nov 26;3(22):3780-3817. doi: 10.1182/bloodadvances.2019000812.

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• Rodeghiero F, Stasi R, Gernsheimer T, Michel M, Provan D, Arnold DM, Bussel JB, Cines DB, Chong BH, Cooper N, Godeau B, Lechner K, Mazzucconi MG, McMillan R, Sanz MA, Imbach P, Blanchette V, Kuhne T, Ruggeri M, George JN. Standardization of terminology, definitions and outcome criteria in immune thrombocytopenic purpura of adults and children: report from an international working group. Blood. 2009 Mar 12;113(11):2386-93. doi: 10.1182/blood-2008-07-162503. Epub 2008 Nov 12.

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MeSH Terms

Conditions

Purpura, Thrombocytopenic, Idiopathic; Thrombocytopenia

Interventions

avatrombopag; Tablets

Condition Hierarchy (Ancestors)

Purpura, Thrombocytopenic; Purpura; Blood Coagulation Disorders; Hematologic Diseases; Hemic and Lymphatic Diseases; Thrombotic Microangiopathies; Blood Platelet Disorders; Cytopenia; Hemorrhagic Disorders; Autoimmune Diseases; Immune System Diseases; Hemorrhage; Pathologic Processes; Pathological Conditions, Signs and Symptoms; Skin Manifestations; Signs and Symptoms

Intervention Hierarchy (Ancestors)

Dosage Forms; Pharmaceutical Preparations

Central Study Contacts

Alaa Alwan, MD

CONTACT

770 274 3114; ala_sh73@yahoo.com

Study Design

• Study Type: interventional
• Phase: phase 4
• Allocation: NA
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: SINGLE GROUP
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: consultant hematologist

Study Record Dates

• First Submitted: August 14, 2025
• First Posted: August 21, 2025
• Study Start: June 8, 2025
• Primary Completion (Estimated): July 8, 2026
• Study Completion (Estimated): July 8, 2027
• Last Updated: August 21, 2025

Record last verified: 2025-08

Data Sharing

• IPD Sharing: Will not share

Locations

IR (1)