This study evaluates the efficacy and safety of umbralisib and ublituximab (U2) as salvage
therapy in patients with chronic lymphocytic leukemia (CLL) who have progressed either on a
BTK inhibitor (BTKi) or BCL-2 inhibitor. The study will evaluate this combination in two
parallel cohorts and subjects will be assigned based on which class of novel agent-containing
regimen was used prior. Cohort A will consist of patients who progress after BTKi containing
regimens and Cohort B will consist of patients who progress after a BCL-2 containing regimen.
Subjects who progress on a regimen containing both a BTKi and a BCL-2 inhibitor, will be
enrolled in cohort B. Each cohort will be evaluated independently of each other.
This is a single-center, two cohort Phase 2 clinical trial investigating the effectiveness of
umbralisib and ublituximab in patients with progressive CLL. Cohort A will consist of
patients who who have progressed after receiving either a BTK inhibitor (BTKi) or BCL-2
- confirmed diagnosis of CLL based upon 2018 International Workshop on CLL (IWCLL)
- Patient must have progressed on a BTK or BCL-2 containing regimen as the prior line of
therapy. Patients who were treated with a regimen containing both classes of novel
agents will be allowed to enroll and will be enrolled into Cohort B. Patients who
receive a temporizing non-experimental treatment such as an anti-CD20 monoclonal
antibody, corticosteroid including high dose methylprednisolone after progression on a
BTK or BCL-2 inhibitor will be considered for enrollment after discussion with the
- Age ≥18 years
- ECOG performance status ≤2
- Patient must have adequate bone marrow function and meet the below thresholds:
- Absolute neutrophil count of ≥ 750 cell/μL in absence of G-CSF for 7 days prior
- Platelet count of ≥ 30,000 cells/μL, or ≥ 20,000 cells/μL if there is bone marrow
- Patient must have adequate organ function and meet the thresholds below:
- Total bilirubin ≤ 1.5 times the upper limit of normal (ULN). Subjects with
bilirubin exceeding this limit due to Gilbert's disease are eligible
- Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) ≤2.5 x ULN if
no liver involvement or ≤5 x the ULN if known liver involvement
- Creatinine clearance >30 ml/min/1.73m2 as calculated by the MDRD equation
- Ability to swallow and retain oral medication.
- Females who are not of child-bearing potential, and females of child-bearing potential
(FCBP) who have a negative serum pregnancy test within 3 days prior to initial trial
treatment. Males of reproductive potential may not participate unless they agree to
use medically acceptable contraception. FCBP and all male partners, and male subjects
must consent to use a medically acceptable method of contraception throughout the
study period and for 4 months after the last dose of study drug
- Willingness and ability to comply with trial and follow-up procedures, and give
written informed consent
- Patient has had prior exposure to a PI3K inhibitor at any point in treatment history
- Patient has discontinued the BTK or BCL2 inhibitor due to intolerance. Intolerance
will be defined as discontinuing prior BTKi or BCL-2 therapy for any reason without
evidence of progression. Patients who were re-challenged after discontinuation for
therapeutic reasons will be allowed if the toxicity did not recur or was managed
without indication for discontinuation. Patients who progress on BTKi or BCL-2 therapy
who were on a reduced dose due to an AE/intolerance are eligible as long as
progression has been documented on that reduced dose.
- Patient has clinical or radiographic evidence of, or has biopsy proven Richter's
transformation or prolymphocytic leukemia.
- Patient has undergone an allogeneic stem cell transplant.
- Patient has received an autologous hematologic stem cell transplant within 6 months of
- Prior history of malignancy within 3 years of study enrollment except for adequately
treated basal, squamous cell carcinoma or non-melanomatous skin cancer, carcinoma in
situ of the cervix, superficial bladder cancer not treated with intravesical
chemotherapy or BCG within 6 months, localized prostate cancer and PSA <1.0 mg/dL on 2
consecutive measurements at least 3 months apart with the most recent one being within
4 weeks of study entry.
- Patient is known to be positive for HIV.
- Patient has history of hepatitis C infection, active infection with hepatitis B or
active cytomegalovirus (CMV) as determined by PCR.
- Patient has previous exposure to a BTK inhibitor therapy within 14 days of initiating
study treatment on Cycle 1 Day 1, or previous exposure to anti-cancer therapy
including chemotherapy, radiotherapy, or investigational therapy, including other
targeted small molecule agents within 21 days of initiating study treatment on Cycle 1
- Evidence of ongoing systemic bacterial, fungal or viral infection, except localized
fungal infections of skin or nails.
- History of anaphylaxis (excluding infusion related reactions) in association with
previous anti-CD20 administration.
- Inflammatory bowel disease (such as Crohn's disease or ulcerative colitis).
- Malabsorption syndromes.
- Irritable bowel syndrome with greater than 3 loose stools per day as a baseline.
- Any severe and/or uncontrolled medical conditions or other conditions that could
affect participation in the study such as:
- Symptomatic, or history of documented congestive heart failure (New York Heart
Association functional classification III-IV)[see Appendix: NYHA Classifications]
- Significant cardiovascular disease such as uncontrolled or symptomatic
arrhythmias, CHF, or myocardial infarction within 6 months of enrollment.
- Concomitant use of medication known to cause QT prolongation or torsades de
pointes should be used with caution and at investigator discretion.
- Poorly controlled or clinically significant atherosclerotic vascular disease
including cerebrovascular accident (CVA), transient ischemic attack (TIA),
angioplasty, cardiac or vascular stenting within 6 months of enrollment.
- Females who are pregnant or lactating.