Study to Assess Safety of HDP-101 in Patients With Relapsed Refractory Multiple Myeloma

Eligibility Criteria

• * Male or female aged ≥18 years.
• * Life expectancy \>12 weeks.
• * Eastern Cooperative Oncology Group Performance Status (PS) of 0 to 2.
• * A confirmed diagnosis of active MM according to the diagnostic criteria established by the International Myeloma Working Group (IMWG).
• * Must have undergone SCT or is considered transplant ineligible.
• * Must have undergone prior treatments with antimyeloma therapy which must have included an immunomodulatory drug, proteasome inhibitor, and anti-CD38 treatment, alone or in combination. In addition, the patient should either refractory or intolerant to any established standard of care therapy providing a meaningful clinical benefit for the patient assessed by the Investigator.
• * Measurable disease as per IMWG criteria.
• * Adequate organ system function as defined in protocol.
• * For patient entering the Phase 2a part only: Prior treatment with any approved or experimental BCMA-targeting modalities are not allowed.
• * Known central nervous system involvement.
• * Plasma cell leukemia.
• * History of congestive heart failure.
• * Autologous or allogenic SCT within 12 weeks before the first infusion or is planning for autologous SCT.
• * Symptomatic graft versus host disease post allogenic hemopoietic cell transplant within 12 months prior to the first study treatment infusion.
• * Radiotherapy within 21 days prior to the first study treatment infusion.
• * History of any other malignancy known to be active.
• * Known human immunodeficiency virus infection.
• * Patients with active infection requiring systemic anti-infective.
• * Patients with positive test results for hepatitis B surface antigen or Hepatitis B core antigen.
• * Patients with positive test results for hepatitis C virus (HCV) infection.
• * Current active liver or biliary disease.