Using Romiplostim to Treat Low Platelet Counts Following Chemotherapy and Autologous Hematopoietic Cell Transplantation in People With Blood Cancer

Study Overview
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Brief Summary
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The purpose of this study is to see if the study drug, romiplostim, helps low platelet count caused by the standard blood cancer treatment of chemotherapy and autologous hematopoietic cell transplantation. This study will also look at whether romiplostim can decrease the number of times the participant needs to return to the clinic for platelet transfusions to treat their low platelet count. In addition, the researchers will determine how safe it is to give romiplostim to people with blood cancer who have received treatment with chemotherapy and autologous hematopoietic cell transplantation.

Official Title
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An Open-Label, Pilot Study of Romiplostim for Conditioning Regimen-Related Thrombocytopenia After High-Dose Therapy and Autologous Hematopoietic Cell Transplantation

Conditions
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Multiple Myeloma, Hodgkin Lymphoma, Non-Hodgkin Lymphoma, HDT-AHCT

Intervention / Treatment
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* Drug: Romiplostim


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Adult patients ≥ 18 years old diagnosed with multiple myeloma (MM), any subtype of Hodgkin lymphoma (HL), or any subtype of non-Hodgkin lymphoma (NHL) For MM, the conditioning regimen used will be high-dose melphalan.°For HL and NHL, the conditioning will be one of the following high-dose regimens: BEAM, CBV, or TBC. Other conditioning regimens not listed above, or variations of the above conditioning regimens, may be allowed at the discretion of the principal investigator if the regimen is considered myeloablative. Adequate organ function is required, defined as follows: Serum bilirubin ≤ 2 mg/dL, unless benign congenital hyperbilirubinemia. AST, ALT, and alkaline phosphatase < 3 times the upper limit of normal. Creatinine clearance ≥ 40 ml/min (calculated by Cockcroft Gault) LVEF ≥ 45% by MUGA or resting echocardiogram Pulmonary function (FEV1 and corrected DLCO) ≥ 45% predicted. Adequate performance status ECOG ≤ 2. Ability to provide written informed consent. Patients undergoing HDT-AHCT. Exclusion Criteria: Patients with a previous diagnosis of a myeloid malignancy. Patients for whom the treating oncologist will be using a non-standard platelet transfusion threshold during the AHCT. Patients with a history of a prior symptomatic or incidental venous thromboembolic event (such as DVT or pulmonary embolism) within the prior 6 months are eligible if they are on and tolerating anti-coagulation, or greater than 6 months ago are eligible if they completed or are on and tolerating anti-coagulation. °A venous thrombotic event associated with a central venous catheter will not make the patient ineligible. Patients with a history of symptomatic arterial thrombotic events such as myocardial infarction, ischemic cerebral vascular accident or transient ischemic attack in the past 6 months are ineligible. Patients who had been diagnosed with Immune Thrombocytopenic Purpura (ITP) at any time prior to the AHCT are ineligible. Patients with a serious concomitant medical condition that could interfere with the conduct of the clinical trial, such as unstable angina, renal failure requiring hemodialysis, or active infection requiring IV antibiotics. Previous use of romiplostim, PEGylated recombinant human megakaryocyte growth and development factor, eltrombopag, recombinant human TPO, any other TPO receptor agonist, or any investigational platelet producing agent. Females who are pregnant or breastfeeding or planning to become pregnant or breastfeed during treatment and for an additional 30 days after treatment discontinuation or longer if required by prescribing information for chemotherapy received during the study. Patients unwilling to use highly effective contraception during the study period and for the duration required by prescribing information for chemotherapy(ies) administered during the study.

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
Intervention Model: Single Group Assignment
Interventional Model Description: A single-center, open-label, pilot study of romiplostim for patients undergoing HDT-AHCT.
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: romiplostim<br>Patients will be enrolled prior to admission for High-Dose Therapy and Autologous Hematopoietic Cell Transplantation (HDT-AHCT), and they will undergo their planned HDT-AHCT for their respective hematologic malignancy as per institutional standards. Regardless of the conditioning regimen received, all patients will receive romiplostim 3.0 mcg/kg SC on Day +1 and romiplostim 2.0 mcg/kg SC on Day +8 after HDT-AHCT. Beyond Day +8, patients will be treated until platelet count is >50,000/mcL, without any platelet transfusions in the prior 48 hours. All doses after the second romiplostim dose will be titrated as per Table 3, based on weekly CBC/platelet counts. No patient will receive more than six doses of romiplostim, even if platelets have not corrected by Day +42. | Drug: Romiplostim<br>* Romiplostim 3.0 mcg/kg SC on Day +1 and Romiplostim 2.0 mcg/kg SC on Day +8 after HDT-AHCT. Beyond Day +8, patients will be treated weekly until platelet count is >50,000/mcL, without any platelet transfusions in the prior 48 hours. All doses after the second Romiplostim dose will be titrated as per Table 3, based on weekly CBC/platelet counts. Patients will receive a maximum of six weekly doses of romiplostim.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| number of days post HDT-AHCT requiring transfusions or grade 4 CTCAE thrombocytopenia | Common Terminology Criteria for Adverse Events (CTCAE) Version 5. | up to 42 days | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| number of platelet transfusions issued during the AHCT admission |  | up to 100 days from AHCT | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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High-Dose Therapy, Autologous Hematopoietic Cell Transplantation, Romiplostim, Thrombocytopenia, 20-180