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