A Study of ELA026 in Participants With Relapsed/Refractory (R/R) T/NK Cell Malignancies (TCMs)

This is the first clinical study of ELA026 as a therapy for R/R TCMs. The study will begin with an initial dose finding component (Part 1, Phase 1a), enrolling approximately 6 to 18 participants (up to maximum of 24 participants) to identify up to 2 dosing regimens with an acceptable safety profile. Upon completion of Part 1, the study will proceed to the cohort expansion phase (Part 2, Phase 1b) to further evaluate these regimens. Parts 1 and 2 will include the following study periods: * Screening period: up to 28 days * Treatment period: up to 6 cycles or 24 weeks (1 cycle = 28 days) * Optional extension period: On a case-by-case basis, participants experiencing ongoing clinical benefits may continue treatment beyond 6 cycles, up to an additional 6 cycles, with approval by the Sponsor * Safety follow-up: 28 days after the last dose of study treatment * Survival follow-up: up to 2 years from the end of treatment