A Study to Investigate Safety of INT2104 Infusions in Participants Aged 18 Years of Age and Older Who Have B-cell Cancers That Came Back After Previous Treatment

The purpose of this first-in-human study is to evaluate the safety and tolerability of INT2104 when administered to humans in a broad population of participants with refractory/relapsing B-cell malignancies. Preliminary efficacy information may also be obtained. INT2104 is a gene therapy delivering a transgene for a chimeric antigen receptor (CAR) specific for CD20 (CAR20). The lentiviral vector is designed to generate CAR T and CAR Natural Killer (NK) cells inside the body following intravenous (IV) administration. Study details include the following: * The study duration will be 5 years * The treatment duration will be a one-time intravenous (IV) infusion of INT2104