Acalabrutinib, Umbralisib, and Ublituximab (AU2) In Relapsed and Untreated CLL

• ClinicalTrials.gov Identifier: NCT04624633
• Recruitment Status: Active, not recruiting
• First Posted: November 12, 2020
• Last Update Posted: March 19, 2024
• Sponsor: Jennifer R. Brown, MD, PhD
• Collaborators: AstraZeneca; TG Therapeutics, Inc.
• Information provided by (Responsible Party): Jennifer R. Brown, MD, PhD, Dana-Farber Cancer Institute

Study Description

Brief Summary:

This study is testing the effectiveness of the study drug combination of acalabrutinib, umbralisib, and ublituximab in participants with Chronic Lymphocytic leukemia (CLL).

The names of the study drugs involved in this study are/is:

• Acalabrutinib (CALQUENCE®, ACP-196)
• Umbralisib (TGR-1202)
• Ublituximab (TG-1101)

Condition or disease	Intervention/treatment	Phase
Chronic Lymphocytic Leukemia; Small Lymphocytic Lymphoma; Relapsed Chronic Lymphocytic Leukemia; Refractory Chronic Lymphocytic Leukemia	Drug: Acalabrutinib; Drug: Umbralisib; Drug: Ublituximab	Phase 2

Detailed Description:

In this research study, Investigators are exploring the combination of acalabrutinib, umbralisib, and ublituximab and hoping to determine if the combination is effective at controlling cancer growth in participants with CLL.

The research study procedures include screening for eligibility and study treatment including evaluations and follow up visits.

Participants will receive the study drugs for a maximum of 24 cycles (2 years) and will be followed for a maximum of 5 years after discontinuing the study drugs.

The names of the study drugs involved in this study are/is:

• Acalabrutinib (CALQUENCE®, ACP-196)
• Umbralisib (TGR-1202)
• Ublituximab (TG-1101)

It is expected that about 60 people will take part in this research study.

This research study is a Phase II clinical trial. Phase II clinical trials test the safety and effectiveness of an investigational drugs to learn whether the drugs work in treating a specific disease. "Investigational" means that the drugs are being studied.

• The U.S. Food and Drug Administration (FDA) has not approved umbralisib or ublituximab as a treatment for any disease.

• The U.S. Food and Drug Administration (FDA) has approved acalabrutinib for CLL, but not in this combination.

  • Acalabrutinib is a type of drug called a kinase inhibitor. It blocks a type of protein called Bruton Tyrosine Kinase (BTK) that helps CLL cells live and grow. By blocking BTK, acalabrutinib may kill cancer cells or stop them from growing.
  • Umbralisib is an investigational drug which blocks a protein called PI3K. PI3K is a protein that helps CLL cells grow.
  • Ublituximab is a type of investigational drug called a monoclonal antibody. A monoclonal antibody is a type of protein made in the laboratory that can locate and bind to substances in the body, including tumor cells. By binding to the tumor cells, the antibody might prevent the tumor cell from growing and spreading.

As of March 2023, TG therapeutics has decided to no longer provide umbralisib, ublituximab and funding for this study. Study participants still on treatment will still have access to acalabrutinib.

Study Design

• Study Type: Interventional (Clinical Trial)
• Estimated Enrollment: 60 participants
• Allocation: Non-Randomized
• Intervention Model: Parallel Assignment
• Masking: None (Open Label)
• Primary Purpose: Treatment
• Official Title: A Phase 2 Study of Acalabrutinib, Umbralisib, and Ublituximab (AU2) in Relapsed and Previously Untreated CLL Patients
• Actual Study Start Date: December 15, 2020
• Estimated Primary Completion Date: January 1, 2025
• Estimated Study Completion Date: January 1, 2030

Arms and Interventions

Arm	Intervention/treatment
Experimental: Cohort 1-Relapsed Disease; Participants with relapsed disease; Treatment with Acalabrutinib & Umbralisib beginning C1D1,; Ublituximab beginning C7D1; Assessment of treatment response; Treatment continues for a maximum of 24 cycles. Participants followed post treatment for a maximum of 5 years	Drug: Acalabrutinib; Oral, twice a day, predetermined dosage; Other Name: Calquence; Drug: Umbralisib; Oral, once a day, predetermined dosage, each 28 day cycle up to 24 cycles; Other Name: RP5264; Drug: Ublituximab; 28 day cycle, starting cycle 7 via iv, on at predetermined dosage and timepoints in each cycle; Other Name: LFB-R603
Experimental: Cohort 2-Treatment Naive; Participants with previously untreated disease; Treatment with Acalabrutinib & Umbralisib beginning C1D1,; Ublituximab beginning C7D1; Assessment of treatment response; Treatment continues for a maximum of 24 cycles. Participants followed post treatment for a maximum of 5 years	Drug: Acalabrutinib; Oral, twice a day, predetermined dosage; Other Name: Calquence; Drug: Umbralisib; Oral, once a day, predetermined dosage, each 28 day cycle up to 24 cycles; Other Name: RP5264; Drug: Ublituximab; 28 day cycle, starting cycle 7 via iv, on at predetermined dosage and timepoints in each cycle; Other Name: LFB-R603

Outcome Measures

Primary Outcome Measures :

1. Rate of Complete Remission after 24 Cycles [ Time Frame: 2 Years ]
   The primary endpoint is the rate of CR after 24 cycles of treatment with acalabrutinib, umbralisib, and ublituximab in previously untreated and relapsed CLL patients, assessed per 2018 IW-CLL criteria.1

Secondary Outcome Measures :

1. Rate of Partial Remission after 24 cycles [ Time Frame: 2 Years ]
   Response of CLL participants will be evaluated using the 2018 iwCLL criteria
2. Rate of Complete Remission with Incomplete Recovery (CRi) after 24 Cycles [ Time Frame: 2 Years ]
   Some patients fulfill all the criteria for a CR, but have a persistent anemia, thrombocytopenia or neutropenia apparently unrelated to CLL, but related to drug toxicity. These patients should be considered as a different category of remission, CR with incomplete marrow recovery (CRi). The marrow evaluation should be performed with scrutiny and not show any clonal disease infiltrate. Response of CLL participants will be evaluated using the 2018 iwCLL criteria
3. Median Progression Free Survival at 2 Years [ Time Frame: 2 Years ]
   progression of CLL participants will be evaluated using the 2018 iwCLL criteria for CLL. The Kaplan Meier method will be used to estimate the median PFS time.
4. Median Progression Free Survival at 3 Years [ Time Frame: 3 Years ]
   progression of CLL participants will be evaluated using the 2018 iwCLL criteria for CLL.The Kaplan Meier method will be used to estimate the median PFS time
5. Median Progression Free Survival at 5 Years [ Time Frame: 5 Years ]
   progression of CLL participants will be evaluated using the 2018 iwCLL criteria for CLL. The Kaplan Meier method will be used to estimate the median PFS time
6. Time to Next Treatment (TTNT) at 2 Years [ Time Frame: 2 Years ]
   Defined as the interval between the first treatment day until the patient starts an alternative therapy for progressive CLL. The Kaplan Meier method will be used to estimate TTNT.
7. Time to Next Treatment (TTNT) at 3 Years [ Time Frame: 3 Years ]
   Defined as the interval between the first treatment day until the patient starts an alternative therapy for progressive CLL. The Kaplan Meier method will be used to estimate TTNT.
8. Time to Next Treatment (TTNT) at 5 Years [ Time Frame: 5 Years ]
   Defined as the interval between the first treatment day until the patient starts an alternative therapy for progressive CLL. The Kaplan Meier method will be used to estimate TTNT.
9. Overall Survival Rate at 2 Years [ Time Frame: 2 Years ]

   Defined as the time from first treatment day to death due to any cause, or censored at date last known alive.

   The Kaplan Meier method will be used to estimate median OS time.

10. Overall Survival Rate at 3 Years [ Time Frame: 3 Years ]
    Defined as the time from first treatment day to death due to any cause, or censored at date last known alive. The Kaplan Meier method will be used to estimate median OS time.
11. Overall Survival Rate at 5 Years [ Time Frame: 5 Years ]
    Defined as the time from first treatment day to death due to any cause, or censored at date last known alive. The Kaplan Meier method will be used to estimate median OS time.
12. Rate of undetectable MRD in bone marrow [ Time Frame: 6 months ]
    Blood or marrow with < 1 CLL cell per 10,000 leukocytes assessed by at least four color flow cytometry (MRD flow), allele-specific oligonucleotide PCR, or high-throughput sequencing using the ClonoSEQ assay
13. Rate of undetectable MRD in bone marrow [ Time Frame: 12 months ]
    Blood or marrow with < 1 CLL cell per 10,000 leukocytes assessed by at least four color flow cytometry (MRD flow), allele-specific oligonucleotide PCR, or high-throughput sequencing using the ClonoSEQ assay
14. Rate of undetectable MRD in bone marrow [ Time Frame: 24 months ]
    Blood or marrow with < 1 CLL cell per 10,000 leukocytes assessed by at least four color flow cytometry (MRD flow), allele-specific oligonucleotide PCR, or high-throughput sequencing using the ClonoSEQ assay
15. Rate of peripheral blood undetectable MRD [ Time Frame: 6 Months ]
    Blood or marrow with < 1 CLL cell per 10,000 leukocytes assessed by at least four color flow cytometry (MRD flow), allele-specific oligonucleotide PCR, or high-throughput sequencing using the ClonoSEQ assay
16. Rate of peripheral blood undetectable MRD [ Time Frame: 12 Months ]
    Blood or marrow with < 1 CLL cell per 10,000 leukocytes assessed by at least four color flow cytometry (MRD flow), allele-specific oligonucleotide PCR, or high-throughput sequencing using the ClonoSEQ assay
17. Rate of peripheral blood undetectable MRD [ Time Frame: 24 Months ]
    Blood or marrow with < 1 CLL cell per 10,000 leukocytes assessed by at least four color flow cytometry (MRD flow), allele-specific oligonucleotide PCR, or high-throughput sequencing using the ClonoSEQ assay
18. Correlation between undetectable MRD in the peripheral blood and bone marrow [ Time Frame: 2 year ]
    MRD should be performed on the marrows to evaluate response at years 1 and 2.
19. Correlation between undetectable MRD in the peripheral blood and bone marrow [ Time Frame: 1year ]
    MRD should be performed on the marrows to evaluate response at years 1 and 2.
20. Time to MRD Positive Disease Recurrence in the Peripheral Blood [ Time Frame: 2 Year ]
    MRD should be performed on the marrows to evaluate response at years 1 and 2.
21. Time to Clinical Disease Progression [ Time Frame: 5 Years ]
    Defined as evidence of disease progression in a patient who has previously achieved the above criteria of a CR or PR for ≥ 6 months.
22. Number of Participants with Treatment Related Adverse Events as Assessed by CTCAE v 5.0 [ Time Frame: first dose of study medication to up to 5 years ]
    The descriptions and grading scales found in the revised NCI Common Terminology Criteria for Adverse Events (CTCAE) version 5.0 will be utilized for dose delays and dose modifications of non-hematologic toxicity.
23. Rates of Therapy Discontinuation by cycle 12 [ Time Frame: 1 Year ]
    A descriptive analysis of rates of therapy discontinuation by cycle 12 will be performed, with subjects grouped by reasons for discontinuation (e.g. achievement of CR, progressive disease, or intolerability). Rates of discontinuation of individual components of the regimen will also be included in this analysis.

Eligibility Criteria

• Ages Eligible for Study: 18 Years and older (Adult, Older Adult)
• Sexes Eligible for Study: All
• Accepts Healthy Volunteers: No

Criteria

Inclusion Criteria:

• Confirmed diagnosis of chronic lymphocytic leukemia (CLL) or small lymphocytic lymphoma (SLL) per International Workshop on CLL (iwCLL) 2018 criteria.1
• Participants must have an indication for treatment as defined by iwCLL 2018 criteria.1
• Participants must have measurable disease, defined as lymphocytosis > 5,000 / μL, or palpable or CT measurable lymphadenopathy ≥ 1.5 cm, or bone marrow involvement ≥ 30%.
• For enrollment to Cohort 1: Participants must have relapsed or refractory disease as per iwCLL 2018 criteria,1 and must have received no more than 2 prior lines of anti-cancer therapy.
• For enrollment to Cohort 2: Participants must have previously untreated disease (i.e.

must not have received any prior systemic therapy for CLL or SLL).

• Age ≥ 18 years. Because no dosing or adverse event data are currently available on the use of umbralisib, acalabrutinib, and ublituximab in participants < 18 years of age and CLL is extremely rare in this population, children are excluded from this study.
• ECOG performance status ≤ 2 (Karnofsky ≥ 60%, see Appendix A).

• Participants must have adequate organ and marrow function as defined below:

  • Total bilirubin ≤ 1.5 × institutional upper limit of normal (ULN) (unless due to hemolysis or Gilbert's disease, in which ≤ 3 × institutional ULN is acceptable)
  • AST (SGOT) and ALT (SGPT) ≤ 2.5 × institutional ULN, OR
  • AST (SGOT) and ALT (SGPT) ≤ 5 × institutional ULN if there is hemolysis or documented disease involvement in the liver
  • Calculated creatinine clearance ≥ 30 mL/min (as calculated by the Cockcroft-Gault formula)
  • Platelet count ≥ 50,000/mcL, unless there is bone marrow involvement with disease
  • PT-INR or aPTT ≤ 2 × institutional ULN
  • Absolute neutrophil count (ANC) ≥ 750 mm3
  • Hemoglobin (Hgb) > 8 g/dL
• Participants with known history or current symptoms of cardiac disease, or history of treatment with cardiotoxic agents, should have a clinical risk assessment of cardiac function using the New York Heart Association Functional Classification. To be eligible for this trial, participants should be class 2B or better.
• The effects of umbralisib, acalabrutinib, or ublituximab on the developing human fetus are unknown. For this reason and because anti-cancer agents are known to be teratogenic, women of child-bearing potential and men must agree to use highly effective methods of contraception. Should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she should inform her treating physician immediately. Men and women treated on this protocol must agree to use highly effective contraception prior to the study, for the duration of study participation, and 4 months after completion of umbralisib, acalabrutinib, or ublituximab administration.
• Ability to understand and the willingness to sign a written informed consent document.
• Ability to swallow and retain oral medication.
• Participants must be able to receive prophylactic anti-pneumocystis jiroveci pneumonia (PJP) and anti-viral therapy

Exclusion Criteria:

• Participants with progressive or refractory disease while receiving either a BTK inhibitor or PI3K inhibitor. Prior exposure to either a BTK inhibitor, PI3K inhibitor, or both is acceptable as long as the participant's disease did not progress during active therapy with the agent(s).
• Participants who have undergone a major surgical procedure within 28 days of the first dose of study drug. If a participant had major surgery greater than 28 days prior to the first dose of study drug, they must have recovered adequately from any adverse event and/or complications from the intervention prior to the first dose (as judged by the treating investigator). For enrollment to Cohort 1: receipt of prior BTK inhibitor treatment within 7 days, or any other anti-cancer therapy (e.g. chemotherapy, immunotherapy, radiation, biologic therapy or any investigational agent) within 21 days of the first dose of study drug.
• Participants who are receiving any other investigational agents.
• History of prior allogeneic stem cell transplant.
• History of autologous hematologic stem cell transplant within 6 months of the first dose of study drug.
• Participants with known Richter's transformation, or histological transformation from CLL to large cell lymphoma.
• Participants with known CNS involvement, because of their poor prognosis and because they often develop progressive neurologic dysfunction that would confound the evaluation of neurologic and other adverse events. Participants with no known history of CNS leukemia are not required to undergo CT scan or lumbar puncture (LP) for trial eligibility unless the participant is symptomatic as judged by the treating investigator.
• Participants with uncontrolled autoimmune hemolytic anemia (AIHA) or idiopathic thrombocytopenic purpura (ITP).
• Participants with active clinically significant bleeding or history of bleeding diathesis (e.g. hemophilia or von Willebrand disease).
• Participants requiring or receiving anticoagulation with warfarin or equivalent vitamin K antagonists (other anticoagulants are permitted).
• Participants with a history of significant cerebrovascular disease/event within 6 months before the first dose of study drug, including stroke or intracranial hemorrhage.
• Participants with uncontrolled intercurrent illness, including but not limited to: unstable angina pectoris, cardiac arrhythmia, or poorly controlled and clinically significant atherosclerotic vascular disease (including patients who required angioplasty, cardiac or vascular stenting within 6 months prior to the first dose of study agent), myocardial infarction within 6 months of screening, congestive heart failure, or patients with Class 3 or 4 cardiac disease as defined by the New York Heart Association Functional Classification. Note: participants with controlled, asymptomatic atrial fibrillation are permitted to enroll on study. Concomitant use of medication known to cause QT prolongation or torsades de pointes should be used with caution and at investigator discretion.
• Individuals with a history of a different malignancy are ineligible with the following exceptions: individuals who have been treated and are disease-free for a minimum of 2 years prior to study enrollment, or individuals who are deemed by the treating investigator to be at low risk for disease recurrence. Additionally, individuals with the following cancers are eligible if diagnosed and curatively treated within the past 2 years: basal or squamous cell carcinomas of the skin, and breast or cervical carcinomas in situ.

Prostate cancer on observation, with stable PSA for 6 months, is also eligible.

• Participants who require ongoing immunosuppressive therapy including systemic corticosteroids (prednisone or equivalent ≤ 10 mg daily is permitted). Topical, inhaled, and ophthalmologic steroids are permitted.
• Participants with a history of inflammatory bowel disease (e.g. Crohn's disease or ulcerative colitis).
• Participants with irritable bowel syndrome (IBS) with greater than 3 loose stools per day at baseline.
• Participants with evidence of ongoing systemic bacterial, fungal, or viral infection, except localized fungal infections of the skin or nails. NOTE: participants may be receiving prophylactic antiviral or antibacterial therapies at the treating investigator's discretion. Use of anti-pneumocystis and antiviral prophylaxis is required.
• Participants with a known history of progressive multifocal leukoencephalopathy (PML).
• Participants with evidence of chronic active Hepatitis B (HBV, not including patients with prior hepatitis B vaccination or positive serum Hepatitis B antibody), chronic active

Hepatitis C infection (HCV), active cytomegalovirus (CMV), or known history of human immunodeficiency virus (HIV):

• If HBc antibody is positive, the subject must be evaluated for the presence of HBV DNA by PCR (see Appendix B). Subjects with positive HBc antibody and negative HBV DNA by PCR are eligible but serial monitoring of HBV DNA by PCR is required, see Section 5.4. Subjects with positive HBV DNA by PCR are not eligible.
• Participants with positive HBsAg are to be excluded.
• If HCV antibody is positive, the subject must be evaluated for the presence of HCV RNA by PCR. Subjects with positive HCV antibody and negative HCV RNA by PCR are eligible. Subjects with positive HCV RNA by PCR are not eligible.

• If the subject is CMV IgG or CMV IgM positive, the subject must be evaluated for the presence of CMV DNA by PCR. Subjects who are CMV IgG or CMV IgM positive but who are CMV DNA negative by PCR are eligible, anti-viral prophylaxis should be considered per treating investigator discretion.

  • History of allergic reactions attributed to study drugs including active product or excipients, or compounds of similar chemical or biologic composition to acalabrutinib, umbralisib, or ublituximab, including participants with a history of anaphylaxis (excluding infusion-related reactions) in association with previous anti-CD20 administration.
  • Participants requiring concomitant treatment with any medications or substances that are strong inhibitors or inducers of CYP3A4 at the time of study enrollment. Because the lists of these agents are constantly changing, it is important to regularly consult a frequently-updated medical reference. As part of the enrollment/informed consent procedures, the participant will be counseled on the risk of interactions with other agents, and what to do if new medications need to be prescribed or if the participant is considering a new over-the-counter medicine or herbal product.
  • Participants requiring concomitant treatment with proton pump inhibitors (e.g.omeprazole, esomeprazole, lansoprazole, dexlansoprazole, rabeprazole, or pantoprazole) at the time of study enrollment. Note: participants receiving proton pump inhibitors who switch to H2-receptor antagonists or antacids prior to the first dose of study medication are eligible.
  • Participants with psychiatric illness/social situations that would limit compliance with study requirements.
  • Pregnant women are excluded from this study because acalabrutinib, umbralisib, and ublituximab are anti-cancer agents with the potential for teratogenic or abortifacient effects. Because there is an unknown but potential risk for adverse events in nursing infants secondary to treatment of the mother with acalabrutinib, umbralisib, or ublituximab, breastfeeding must be discontinued prior to the initiation of study treatment. A negative serum pregnancy test is required for women of childbearing potential within 3 days prior to Cycle 1 Day 1.

Contacts and Locations

Locations

United States, Massachusetts

Dana Farber Cancer Institute

Boston, Massachusetts, United States, 02115

Sponsors and Collaborators

Jennifer R. Brown, MD, PhD

AstraZeneca

TG Therapeutics, Inc.

Investigators

• Principal Investigator: Jennifer R Brown, MD, PhD; Dana-Farber Cancer Institute

More Information

• Responsible Party: Jennifer R. Brown, MD, PhD, Sponsor Investigator, Dana-Farber Cancer Institute
• ClinicalTrials.gov Identifier: NCT04624633
• Other Study ID Numbers: 20-394
• First Posted: November 12, 2020
• Last Update Posted: March 19, 2024
• Last Verified: March 2024

Individual Participant Data (IPD) Sharing Statement:

• Plan to Share IPD: Yes
• Plan Description: The Dana-Farber / Harvard Cancer Center encourages and supports the responsible and ethical sharing of data from clinical trials. De-identified participant data from the final research dataset used in the published manuscript may only be shared under the terms of a Data Use Agreement. Requests may be directed to Sponsor Investigator or designee. The protocol and statistical analysis plan will be made available on Clinicaltrials.gov only as required by federal regulation or as a condition of awards and agreements supporting the research
• Supporting Materials: Study Protocol; Statistical Analysis Plan (SAP); Informed Consent Form (ICF)
• Time Frame: Data can be shared no earlier than 1 year following the date of publication
• Access Criteria: Contact the Belfer Office for Dana-Farber Innovations (BODFI) at innovation@dfci.harvard.edu

• Studies a U.S. FDA-regulated Drug Product: Yes
• Studies a U.S. FDA-regulated Device Product: No

Keywords provided by Jennifer R. Brown, MD, PhD, Dana-Farber Cancer Institute:

Chronic Lymphocytic Leukemia; Small Lymphocytic Lymphoma; Relapsed Chronic Lymphocytic Leukemia; Refractory Chronic Lymphocytic Leukemia

Additional relevant MeSH terms:

Leukemia; Leukemia, Lymphoid; Leukemia, Lymphocytic, Chronic, B-Cell; Neoplasms by Histologic Type; Neoplasms; Lymphoproliferative Disorders; Lymphatic Diseases; Immunoproliferative Disorders; Immune System Diseases; Hematologic Diseases; Leukemia, B-Cell; Chronic Disease; Disease Attributes; Pathologic Processes; Acalabrutinib; Tyrosine Kinase Inhibitors; Protein Kinase Inhibitors; Enzyme Inhibitors; Molecular Mechanisms of Pharmacological Action; Antineoplastic Agents