A Study of Pirtobrutinib (LOXO-305) Versus Bendamustine Plus Rituximab (BR) in Untreated Patients With Chronic Lymphocytic Leukemia (CLL)/Small Lymphocytic Lymphoma (SLL)

Inclusion Criteria:

Confirmed diagnosis of CLL/SLL requiring therapy, per iwCLL 2018 criteria
Eastern Cooperative Oncology Group (ECOG) Performance Status 0-2
Adequate organ function
Platelets greater than or equal to (≥)75 x 10⁹/liter (L) (≥50 × 10⁹/L for patients with evidence of bone marrow infiltrate), hemoglobin ≥8 grams/deciliter (g/dL), and absolute neutrophil count ≥0.75 x 10⁹/L
Kidney function: Estimated creatinine clearance ≥40 milliliters per minute (mL/min)

Exclusion Criteria:

Known or suspected Richter's transformation at any time preceding enrollment
Prior systemic therapy for CLL/SLL
Presence of 17p deletion
Central nervous system (CNS) involvement
Active uncontrolled auto-immune cytopenia (e.g., autoimmune hemolytic anemia [AIHA], idiopathic thrombocytopenic purpura [ITP])
Significant cardiovascular disease
Active hepatitis B or hepatitis C
Active cytomegalovirus (CMV) infection
Active uncontrolled systemic bacterial, viral, fungal, or parasitic infection
Known human immunodeficiency virus (HIV) infection, regardless of cluster of differentiation 4 (CD4) count
Concurrent use of investigational agent or anticancer therapy except hormonal therapy
Patients requiring therapeutic anticoagulation with warfarin or another Vitamin K antagonist
Vaccination with a live vaccine within 28 days prior to randomization

Patients with the following hypersensitivity:

Known hypersensitivity, including anaphylaxis, to any component or excipient of pirtobrutinib or bendamustine
Prior significant hypersensitivity to rituximab