Study of Iopofosine I 131 (CLR 131) in Select B-Cell Malignancies (CLOVER-1) and Pivotal Expansion in Waldenstrom Macroglobulinemia

[CLOVER-1] Inclusion Criteria: All Patients

Histologically or cytologically confirmed MM; Patients with primary or secondary CNSL may be enrolled.
ECOG performance status of 0 to 2
18 years of age or older
Life expectancy of at least 6 months
Platelets ≥ 75,000/µL (if full-dose anticoagulation therapy is used, platelets ≥ 100,000/µL are required)
WBC count ≥ 3000/µL
Absolute neutrophil count ≥ 1500/µL
Hemoglobin ≥ 9 g/dL (last transfusion, if any, must be at least 1 week prior to study registration, and no transfusions are allowed between registration and dosing)
Estimated glomerular filtration rate ≥ 30 mL/min/1.73 m2
Aspartate aminotransferase (AST) and Alanine aminotransferase (ALT) ≤ 2.5 × upper limit of normal (ULN)
Bilirubin < 1.5 × ULN
International normalized ratio (INR) < 2.5
If patient is on full-dose anticoagulation therapy, the anticoagulation therapy must be reversible and reversal of the anticoagulation therapy must not be life-threatening, as judged by the Investigator
Patients who have undergone stem cell transplant must be at least 100 days from transplant

Patients with Multiple Myeloma

At least 5 prior regimens, which must include at least 1 approved proteasome inhibitor (bortezomib, carfilzomib, or ixazomib), at least 1 approved immunomodulatory agent (thalidomide, lenalidomide, or pomalidomide), and at least 1 approved monoclonal antibody (e.g., daratumumab or elotuzumab) with or without maintenance therapy, unless patients are intolerable to such agents or ineligible to receive such agents.
At least triple-class refractory (refractory to a proteasome inhibitor, immunomodulatory agent, and a monoclonal antibody)

Progressive disease defined by any of the following:

25% increase in serum M-protein from the lowest response value during (or after) last therapy and/or absolute increase in serum M-protein of ≥ 0.5 g/dL
25% increase in urine M-protein from the lowest response value during (or after) last therapy and/or absolute increase in urine M-protein of ≥ 200 mg/24 h
25% increase in bone marrow plasma cell percentage from the lowest response value during (or after) last therapy. Absolute bone marrow plasma cell percentage must be ≥ 10% unless prior CR when absolute bone marrow plasma cell percentage must be ≥ 5%.
25% increase in serum FLC level from the lowest response value during (or after) last therapy; the absolute increase must be > 10 mg/dL
New onset hypercalcemia > 11.5 mg/dL
Failure to obtain a partial response or better to current treatment, or cannot further improve their response to current treatment
Appearance of new extramedullary disease

Measurable disease defined by any of the following:

Serum M-protein > 0.5 g/dL
Urine M-protein > 200 mg/24 h
Serum FLC assay: Involved FLC level ≥ 10 mg/dL provided serum FLC ratio is abnormal.

[CLOSED] Patients with Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma, Lymphoplasmacytic Lymphoma/Waldenstom Macroglobulinemia, or Marginal Zone Lymphoma

Prior treatment with at least 2 prior regimens, which may include chemotherapy, an approved anti-CD20 antibody with or without maintenance therapy, and an approved targeted agent, unless patients are ineligible to receive such agents
Patients with Helicobacter pylori+ mucosa-associated lymphoid tissue lymphoma must have received 1 prior antibiotic regimen for H pylori
At least 1 measurable nodal lesion with longest diameter > 15 mm or 1 measurable extranodal lesion (eg, hepatic nodule) with longest diameter > 10 mm. Additional parameters (e.g., measurable IgM for patients with Lymphoplasmacytic Lymphoma) may be allowed if they meet current NCCN guidelines for symptomatic disease. Patients with uptake by FDG-PET scan may be allowed with prior approval of Sponsor.

[CLOSED] Patients with Mantle Cell Lymphoma

Prior treatment with at least 1 prior regimen
At least 1 measurable nodal lesion with longest diameter > 15 mm or 1 measurable extranodal lesion (eg, hepatic nodule) with longest diameter > 10 mm. Patients with uptake by FDG-PET scan may be allowed with prior approval of Sponsor.

[CLOSED] Patients with Diffuse Large B-Cell Lymphoma

Relapsed or refractory to combination chemotherapy for DLBCL that contains rituximab and an anthracycline; or is intolerable to such agents. Relapsed disease is defined as either recurrence of disease after a CR or PD after achieving a partial response (PR) or SD. Refractory disease is defined as failure to achieve at least SD with any 1 line of therapy or with PD ≤ 3 months of the most recent chemotherapy regimen.
At least 1 measurable nodal lesion with longest diameter > 15 mm or 1 measurable extranodal lesion (eg, hepatic nodule) with longest diameter > 10 mm. Patients with uptake by FDG-PET scan may be allowed with prior approval of Sponsor.

Patients with CNS Lymphoma

Must have biopsy-proven disease and must have received at least one prior intervention for their disease.
Must be at least two weeks from CNS biopsy before administration of iopofosine I 131.
Must have at least one lesion with enhancement on brain imaging.
Stable (or decreasing) dose of corticosteroids or anti-convulsant medication for at least 7 days prior to dosing

[CLOVER-1] Exclusion Criteria:

Ongoing Grade 2 or greater toxicities due to previous therapies. Stable, tolerable Grade 2 AEs (eg, neuropathy) may be allowed.
Prior external-beam RT resulting in greater than 20% of total bone marrow receiving greater than 20 Gy.
Prior total body or hemi-body irradiation. Patients who have received prior low-dose total body or hemi-body irradiation may be allowed on a case-by-case basis after discussion with Sponsor (considerations may include factors such as time since irradiation, total lifetime accumulated dose, etc.)
Extradural tumor in contact with the spinal cord or tumor located where swelling in response to therapy may impinge upon the spinal cord
For patients with CLL/SLL, LPL, or MZL, transformation to a more aggressive form of NHL
Ongoing chronic immunosuppressive therapy
Clinically significant bleeding event within prior 6 months
Ongoing anti-platelet therapy (except low-dose aspirin [eg, 81 mg daily] for cardioprotection)
Anti-cancer therapy within two weeks of initial iopofosine I 131 infusion. Low dose dexamethasone for symptom management is allowed
Radiation therapy, chemotherapy, immunotherapy, or investigational therapy within 2 weeks of eligibility-defining bone marrow biopsy.
For patients with primary or secondary CNSL, active bleeding in the tumor bed and/or uncontrolled seizure activity

[CLOVER-WaM] Inclusion Criteria

Histologically or cytologically confirmed WM. Patients with a diagnosis of LPL may be enrolled with prior Sponsor approval.
Patient has an Eastern Cooperative Oncology Group (ECOG) performance status (PS) of 0 to 2 (Appendix C)
Patient is 18 years of age or older
Life expectancy of at least 6 months
Received at least two prior lines of therapy for WM
Measurable IgM (above upper limit of normal) OR at least one measurable nodal lesion with longest diameter > 15 mm or one measurable extranodal lesion (e.g., hepatic nodule) with longest diameter > 10 mm

[CLOVER-WaM] Exclusion Criteria

Ongoing Grade 2 or greater toxicities due to previous therapies, excluding alopecia.
Prior external-beam RT resulting in greater than 20% of total bone marrow receiving greater than 20 Gy.
Prior total body or hemi-body irradiation. Patients who have received prior low-dose total body or hemi-body irradiation may be allowed on a case-by-case basis after discussion with Sponsor (considerations may include factors such as time since irradiation, total lifetime accumulated dose, etc.)
Patients with second malignancies in addition to WM, if the second malignancy has required therapy in the last 2 years or is not in remission; exceptions to this criterion include successfully treated non-metastatic basal cell or squamous cell skin carcinoma, or prostate cancer that does not require therapy
Anti-cancer therapy within two weeks of initial iopofosine I 131 infusion.
Need for acute treatment of WM (e.g., those with hyperviscosity)