This clinical trial is evaluating a drug called AC676 in participants with Relapsed/Refractory B-cell Malignancies. The main goals of the study are to: * Identify the recommended dose of AC676 that can be given safely to participants * Evaluate the safety profile of AC676 * Evaluate the pharmacokinetics of AC676 * Evaluate the effectiveness of AC676
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Incidence of dose limiting toxicities (DLTs) from AC676 monotherapy
Timeframe: From cycle 1 day 1 to Cycle 1 day 28. Cycles are 28 days.
Incidence of treatment-emergent adverse events (TEAEs) and clinically significant Grade 3 or higher laboratory abnormalities using CTCAE v5.0 criteria.
Timeframe: Approximately 18 months
Maximum tolerated dose (MTD) and/or recommended Phase II dose (RP2D)
Timeframe: Approximately 18 months