Study of NX-5948 in Combination With Other Agents in Adults With B-cell Malignancies

Key Inclusion Criteria: * Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 2 * Adequate organ and bone marrow function * Measurable disease by computed tomography (CT) per iwCLL * For R/R CLL/SLL, prior therapy must include treatment with a Bruton tyrosine kinase inhibitor (BTKi) * For 1L CLL/SLL, confirmed previously untreated CLL/SLL with a clinical indication for systemic treatment that meets iwCLL criteria * Must sign an informed consent form indicating understanding of the study purpose and procedures and willingness to participate Key Exclusion Criteria: * Known or suspected prolymphocytic leukemia or Richter's transformation at any time preceding enrollment * Investigational agent or anticancer therapy within 5 half-lives or 14 days (whichever is shorter) prior to planned start of study treatment * Radiotherapy within 2 weeks of the first dose of study drug except for focal palliative radiation * Use of systemic corticosteroids (\>20 mg/day prednisone or equivalent) within the 7 days prior to initiation of study treatment excepting those used as prophylaxis for radiodiagnostic contrast * Previously treated with a BTK degrader * Previously treated with a BCL-2 inhibitor (BCL-2i) unless eligible for retreatment * Known central nervous system (CNS) lymphoma or leukemia * Myocardial infarction, unstable angina, unstable symptomatic ischemic heart disease, placement of a coronary arterial stent, or any other significant cardiac condition within 6 months of planned start of study treatment * Thromboembolic events, stroke, or intracranial hemorrhage within 6 months of planned start of study treatment Note: Other Inclusion/Exclusion criteria may apply as defined in the protocol.