Dose escalation/infusion duration phase:~During the CID-103 dose escalation/infusion duration phase, only patients diagnosed with multiple myeloma who have relapsed or are refractory to at least two prior lines of therapy including a proteasome inhibitor, an immunomodulatory agent and an anti-CD38 antibody will be enrolled. Patients will receive monotherapy CID-103. Dose escalation decisions will be based on dose-limiting toxicities; infusion duration decisions will be based on infusion-related reactions. The dose taken forward into the expansion phase will be the RP2D determined in the dose escalation phase.~Expansion phase:~The expansion phase consists of two specific cohorts of patients with relapsed/refractory multiple myeloma: 1) Pretreated cohort having received previous treatment with an anti-CD38 antibody and 2) Naïve cohort in patients for whom an anti-CD38 antibody is unavailable. Eight patients will be enrolled into each cohort, and if one or more responses is observed, that cohort will be expanded to a total of 14 patients to further assess efficacy. Patients must have had at least two prior systemic therapies (mono or combo), including a proteasome inhibitor and an immunomodulatory agent. Patients will be treated until disease progression or unacceptable toxicities.
Patients with relapsed/refractory multiple myeloma will be enrolled in a dose-escalation phase receiving monotherapy CID-103. Once the recommended CID-103 dose and infusion duration is known, additional patients will be enrolled in an expansion phase consisting of two cohorts (anti-CD38 pretreated, and anti-CD38 treatment naïve). Patients will be treated until disease progression or unacceptable toxicities.