A Study to Evaluate the Efficacy and Safety of Daratumumab in Combination With Cyclophosphamide, Bortezomib and Dexamethasone (CyBorD) Compared to CyBorD Alone in Newly Diagnosed Systemic Amyloid Light-chain (AL) Amyloidosis

Prior treatment

• Prior therapy for AL amyloidosis or multiple myeloma including medications that target CD38, with the exception of 160 mg dexamethasone (or equivalent corticosteroid) maximum exposure prior to randomization
• Previous or current diagnosis of symptomatic multiple myeloma, including the presence of lytic bone disease, plasmacytomas, \>= 60 percent (%) plasma cells in the bone marrow, or hypercalcemia
• Planned stem cell transplant during the first 6 cycles of protocol therapy are excluded. Stem cell collection during the first 6 cycles of protocol therapy is permitted

Other illness

• Known to be seropositive for human immunodeficiency virus (HIV)
• Any one of the following:
  • Seropositive for hepatitis B (defined by a positive test for hepatitis B surface antigen \[HBsAg\]). Participants with resolved infection (ie, participants who are HBsAg negative but positive for antibodies to hepatitis B core antigen \[anti-HBc\] and/or antibodies to hepatitis B surface antigen \[anti-HBs\]) must be screened using real-time polymerase chain reaction (PCR) measurement of hepatitis B virus (HBV) deoxyribonucleic acid (DNA) levels. Those who are PCR positive will be excluded
  • Known to be seropositive for hepatitis C (except in the setting of a sustained virologic response \[SVR\], defined as aviremia at least 12 weeks after completion of antiviral therapy)

Lab values

• Evidence of significant cardiovascular conditions as specified below:
  • NT-ProBNP \> 8500 nanogram per liter (ng/L)
  • New York Heart Association (NYHA) classification IIIB or IV heart failure
  • Heart failure that in the opinion of the investigator is on the basis of ischemic heart disease (eg, prior myocardial infarction with documented history of cardiac enzyme elevation and electrocardiogram \[ECG\] changes) or uncorrected valvular disease and not primarily due to AL amyloid cardiomyopathy
  • Inpatient admission to a hospital for unstable angina or myocardial infarction within the last 6 months prior to first dose or percutaneous cardiac intervention with recent stent within 6 months or coronary artery bypass grafting within 6 months
  • For participants with congestive heart failure, cardiovascular-related hospitalizations within 4 weeks prior to randomization
  • Participants with a history of sustained ventricular tachycardia or aborted ventricular fibrillation or with a history of atrioventricular (AV) nodal or sinoatrial (SA) nodal dysfunction for which a pacemaker/implantable cardioverter-defibrillators \[ICD\] is indicated but not placed (participants who do have a pacemaker/ICD are allowed on study)
  • Screening 12-lead ECG showing a baseline QT interval as corrected by Fridericia's formula (QTcF) \> 500 milliseconds (msec). Participants who have a pacemaker may be included regardless of calculated QTc interval
  • Supine systolic blood pressure \< 90 millimeter of mercury (mmHg), or symptomatic orthostatic hypotension, defined as a decrease in systolic blood pressure upon standing of \> 20 mmHg despite medical management (eg, midodrine, fludrocortisones) in the absence of volume depletion

Other

• Grade 2 sensory or Grade 1 painful peripheral neuropathy

• Histopathological diagnosis of amyloidosis based on detection by immunohistochemistry and polarizing light microscopy of green bi-refringent material in congo red stained tissue specimens (in an organ other than bone marrow) or characteristic electron microscopy appearance
• Measurable disease of amyloid light-chain (AL) amyloidosis as defined by at least one of the following:
  • serum monoclonal (M)-protein greater than or equal (\>=) 0.5 grams/deciliter (g/dL) by protein electrophoresis (routine serum protein electrophoresis and immunofixation \[IFE\] performed at a central laboratory)
  • serum free light chain greater than or equal to (\>=) 50 milligram/Liter (mg/L) with an abnormal kappa:lambda ratio or the difference between involved and uninvolved free light chains (dFLC) \>= 50 mg/L
• One or more organs impacted by AL amyloidosis according to consensus guidelines
• Eastern Cooperative Oncology Group (ECOG) Performance Status (PS) 0, 1 or 2