A Study of Zilovertamab Vedotin (MK-2140) as Monotherapy and in Combination in Participants With Aggressive and Indolent B-cell Malignancies (MK-2140-006)

The main inclusion criteria include, but are not limited to the following:

Inclusion Criteria:

* For aggressive B-cell malignancies mantle cell lymphoma (MCL): Has histologically confirmed biopsy according to the 2016 World Health Organization (WHO) classification of neoplasms of the hematopoietic and lymphoid tissues and has relapsed or refractory disease after at least 2 prior systemic therapies including a Bruton's tyrosine kinase inhibition/inhibitor(s) (BTKi), and is post chimeric antigen receptor T (CAR-T) cell therapy or is ineligible for CAR-T cell therapy.
* For aggressive B-cell malignancies MCL Cohort C: Has histologically confirmed biopsy according to the 2016 World Health Organization (WHO) classification of neoplasms of the hematopoietic and lymphoid tissues and has relapsed or refractory disease after at least 1 prior systemic therapy and has no prior exposure to a non-covalent BTKi.
* For aggressive B-cell malignancies Richter transformation lymphoma (RTL): Has histologically confirmed biopsy according to the 2016 World Health Organization (WHO) classification of neoplasms of the hematopoietic and lymphoid tissues and has relapsed or refractory disease.
* For indolent B-cell malignancies follicular lymphoma (FL) and chronic lymphocytic leukemia (CLL): Has histologically confirmed biopsy and has relapsed or refractory disease after at least 2 prior systemic therapies and no other available therapy.
* Participants who are hepatitis B surface antigen (HBsAg) positive are eligible if they have received hepatitis B virus (HBV) antiviral therapy for at least 4 weeks and have undetectable HBV viral load prior to randomization/allocation.
* Have an Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 2 assessed within 7 days before cycle 1 day 1.

Exclusion Criteria:

* Has received solid organ transplant at any time.
* Has clinically significant (ie, active) cardiovascular disease: cerebral vascular accident/stroke (\<6 months prior to enrollment), myocardial infarction (\<6 months prior to enrollment), unstable angina (\<6 months prior to enrollment), congestive heart failure (New York Heart Association Classification Class ≥II), or serious cardiac arrhythmia requiring medication.
* Has pericardial effusion or clinically significant pleural effusion.
* Has ongoing Grade \>1 peripheral neuropathy.
* Has a demyelinating form of Charcot-Marie-Tooth disease.
* Has a history of a second malignancy, unless potentially curative treatment has been completed with no evidence of malignancy for 2 years.
* Participants with FL who have transformed to a more aggressive type of lymphoma.
* Has received prior systemic anticancer therapy within 5 half-lives or 4 weeks (if prior therapy was a monoclonal antibodies) or 2 weeks (if prior therapy was small molecules like kinase inhibitors) prior to the first dose of study intervention.
* Has received prior radiotherapy within 28 days of start of study intervention. Participants must have recovered from all radiation-related toxicities.
* Has ongoing corticosteroid therapy exceeding 30 mg daily of prednisone equivalent.
* Has received a live or live-attenuated vaccine within 30 days before the first dose of study intervention.
* Has known active central nervous system (CNS) lymphoma involvement or active CNS involvement by lymphoma.
* Has an active infection requiring systemic therapy.
* Has a known history of human immunodeficiency virus (HIV) infection not well controlled on antiretroviral therapy (ART)
* Active HBV or hepatitis C virus (HCV) infection.
* For Cohort C only: has any clinically significant gastrointestinal abnormalities that might alter absorption.