Table 3.

Validated criteria for HR and organ response

CategoryCriteria
HR CR (all of the following criteria must be met):
  • Serum and urine immunofixation negative for monoclonal protein

  • Normalized free light chain ratio

 
VGPR reduction of dFLC below 40 mg/L 
PR 50% reduction of dFLC 
Organ response Kidney: a 30% reduction in 24-h urine protein excretion or a drop of proteinuria below 0.5 g per 24 h in the absence of progressive renal insufficiency, defined as a decrease in eGFR to 25% over baseline. 
Heart (NT-proBNP based): reduction of NT-proBNP of 30% and >300 ng/L over the starting value. Baseline NT-proBNP has to be ≥650 ng/L to be measurable. 
Heart (BNP based): reduction of BNP of 30% and >50 ng/L over the starting value. Baseline BNP has to be ≥150 ng/L to be measurable. 
CHOR model Patients are classified in 2 CHOR groups according to a score based on the HR and organ response criteria
  • Score for HR: CR, 0; VGPR, 1; PR, 2; no response, 3

  • Score for organ response: response in all organs involved, 0; response in at least 1 but not all the organs involved, 1; no organ response, 2.

 
CHOR group 1, score 0-3 
CHOR group 2, score 4-5 
CategoryCriteria
HR CR (all of the following criteria must be met):
  • Serum and urine immunofixation negative for monoclonal protein

  • Normalized free light chain ratio

 
VGPR reduction of dFLC below 40 mg/L 
PR 50% reduction of dFLC 
Organ response Kidney: a 30% reduction in 24-h urine protein excretion or a drop of proteinuria below 0.5 g per 24 h in the absence of progressive renal insufficiency, defined as a decrease in eGFR to 25% over baseline. 
Heart (NT-proBNP based): reduction of NT-proBNP of 30% and >300 ng/L over the starting value. Baseline NT-proBNP has to be ≥650 ng/L to be measurable. 
Heart (BNP based): reduction of BNP of 30% and >50 ng/L over the starting value. Baseline BNP has to be ≥150 ng/L to be measurable. 
CHOR model Patients are classified in 2 CHOR groups according to a score based on the HR and organ response criteria
  • Score for HR: CR, 0; VGPR, 1; PR, 2; no response, 3

  • Score for organ response: response in all organs involved, 0; response in at least 1 but not all the organs involved, 1; no organ response, 2.

 
CHOR group 1, score 0-3 
CHOR group 2, score 4-5 

CHOR, composite hematologic/organ response model; PR, partial response.

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