This is an open-label, multicenter, Phase 2 study in subjects with newly diagnosed monoclonal immunoglobulin deposition disease treated with daratumumab, bortezomib, cyclophosphamide, and dexamethasone.

The current study aims to investigate daratumumab, bortezomib, cyclophosphamide, and dexamethasone regimen in patients with newly diagnosed monoclonal immunoglobulin deposition disease. Approximately 25 subjects will receive primary therapy with daratumumab-CyBorD. The primary endpoint is overall complete hematologic response (CHR) rate at 6 months.

Inclusion Criteria:

1. Diagnosis of monoclonal immunoglobulin deposition disease without anti-plasma cell treatment
2. ECOG 0,1,2
3. Neu≥ 1.0*10^9/L, HGB ≥70g/L, PLT ≥ 50*10^9/L.
4. Total bilirubin (TBil) ≤3×upper limit of normal (ULN); aspartate aminotransferase (AST) and alanine aminotransferase (ALT) ≤3.0×ULN;
5. Informed consent explained to, understood by and signed by the patient.

Exclusion Criteria:

1. Prior therapy for MIDD, with the exception of equal or less than 160 mg dexamethasone (or equivalent corticosteroid)
2. Fulfill with the criteria of active multiple myeloma or active lymphoplasmacytic lymphoma.
3. Presence of other tumors which is/are in advanced malignant stage and has/have systemic metastasis;
4. Severe or persistent infection that cannot be effectively controlled;
5. Presence of severe autoimmune diseases or immunodeficiency disease;
6. Patients with active hepatitis B or hepatitis C ([HBVDNA+] or [HCVRNA+]);
7. Patients with HIV infection or syphilis infection;
8. Any situations that the researchers believe will increase the risks for the subject or affect the results of the study.