Study of Melflufen (Melphalan Flufenamide) in Combination With Daratumumab in Relapsed-Refractory Multiple Myeloma

Inclusion Criteria:

* A prior diagnosis of multiple myeloma with documented disease progression after the last line of therapy
* Double refractory to an IMiD and a PI (regardless of the number of prior lines of therapy) or have received at least 3 prior lines of therapy including an IMiD and a PI
* Prior treatment with daratumumab or another anti-CD38 antibody may be allowed under certain circumstances:

  * Achieved at least partial response (PR) and not refractory to an anti-CD38 antibody
  * At least 6 months since the last dose of anti-CD38 antibody
  * Not discontinued anti-CD38 antibody treatment due to related Grade ≥ 3 toxicity
* Male and female of childbearing potential agree to use contraception during the treatment period and at least 3 months after the last dose

Exclusion Criteria:

* Primary refractory disease (i.e., never responded with at least Minimal Response to any prior therapy for multiple myeloma)
* Prior treatment with CD38 CAR-T cell therapy or CD38/CD3 bispecific antibodies
* Any medical condition that may interfere with safety or participation in this study
* Other malignancy diagnosed or requiring treatment within the past 3 years with the exception of adequately treated basal cell carcinoma, squamous cell skin cancer, carcinoma in-situ of the cervix or breast, or very low and low-risk prostate cancer in active surveillance
* Known or suspected amyloidosis, plasma cell leukemia, or POEMS syndrome (plasma cell dyscrasia with polyneuropathy, organomegaly, endocrinopathy, monoclonal protein, and skin changes)
* Known central nervous system (CNS) or meningeal involvement of myeloma
* Prior stem cell transplant (autologous and/or allogenic) within 6 months of initiation of therapy or prior allogeneic stem cell transplantation with active graft-versus-host-disease
* Prior treatment with melflufen