A Study to Evaluate VIP152 in Subjects With Relapsed/Refractory Chronic Lymphocytic Leukemia or Richter Syndrome

Inclusion Criteria: * Male or female patients aged \>/=18 years * Adequate bone marrow, liver, and renal functions * Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 2 * Diseases as defined below: PART1 * Subjects with CLL with either del(17p) by FISH or TP53 mutation who have received ≥1 prior therap(ies) and the last prior regimen must have included venetoclax plus an anti-CD20 antibody and/or a BTKi and did not produce complete remission. Subjects with CLL with either del(17p) by FISH or TP53 mutation who have received ≥2 prior regimens and are intolerant to BTKi and/or venetoclax are also eligible. or * Subjects with CLL transformed to DLBCL who have relapsed after, or been refractory, to at least 1 prior line of therapy for DLBCL PART2 * Subjects with CLL who are currently on an approved BTKi (monotherapy only) at the dose and schedule per the local label for ≥ 12 months who have only achieved SD, PR or PRL Exclusion Criteria: * Active clinically serious infections of Grade \> 2; requiring parenteral therapy * Subjects who have new or progressive brain or meningeal or spinal metastases. * Anticancer chemotherapy or immunotherapy during the study or within one week prior to the first dose of study drug * Major surgery or significant trauma within 4 weeks before the first dose of study drug * Allogeneic bone marrow transplant or stem cell rescue within 4 months before first dose of study drug; patients must have completed immunosuppressive therapy before enrollment