A Trial of Pirtobrutinib (LOXO-305) Plus Venetoclax and Rituximab (PVR) Versus Venetoclax and Rituximab (VR) in Previously Treated Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma (CLL/SLL)
Study Phase: Phase 3
Recruitment Status: Recruiting
Start Date: September 20, 2021
End Date: January 01, 2027
The purpose of this study is to compare the efficacy and safety of fixed duration pirtobruitinib (LOXO-305) with VR (Arm A) compared to VR alone (Arm B) in patients with CLL/SLL who have been previously treated with at least one prior line of therapy. Participation could last up to five years.
Inclusion Criteria:
- Confirmed diagnosis of CLL/SLL requiring therapy per iwCLL 2018 criteria
- Previous treatment with at least one line of therapy that may include a covalent Bruton's tyrosine kinase (BTK) inhibitor
- Platelets greater than or equal to (≥)50 x 10⁹/liter (L), hemoglobin ≥8 grams/deciliter (g/dL) and absolute neutrophil count ≥1.0 x 10⁹/L
- Adequate organ function
- Eastern Cooperative Oncology Group (ECOG) Performance Status 0-2
- Estimated creatinine clearance ≥30 milliliters per minute (mL/min)
Exclusion Criteria:
- Known or suspected Richter's transformation at any time preceding enrollment
- Prior therapy with a non-covalent (reversible) BTK inhibitor
- Patients requiring therapeutic anticoagulation with warfarin or another Vitamin K antagonist
- Current treatment with strong cytochrome P450 (CYP) 3A4 (CYP3A4) inhibitors or inducers
- Prior therapy with venetoclax
- Central nervous system (CNS) involvement
- Active uncontrolled systemic bacterial, viral, fungal, or parasitic infection
- Known human immunodeficiency virus (HIV) infection, regardless of cluster of differentiation 4 (CD4) count
- Allogeneic stem cell transplantation (SCT) or chimeric antigen receptor (CAR)-T within 60 days
- Active hepatitis B or hepatitis C
- Known active cytomegalovirus (CMV) infection
- Uncontrolled immune thrombocytopenic purpura (ITP) or autoimmune hemolytic anemia (AIHA)
- Significant cardiovascular disease
- Vaccination with a live vaccine within 28 days prior to randomization
- Patients with the following hypersensitivity:
- Known hypersensitivity to any component or excipient of pirtobrutinib and venetoclax
- Prior significant hypersensitivity to rituximab
- Known allergy to allopurinol and inability to take uric acid lowering agent