Table 4.

Primary and secondary objectives and endpoints

ObjectivesEndpoints
Co-primary objectives

Co-primary endpoints

(tested in parallel for non-inferiority)

• To compare daprodustat with darbepoetin alfa for CV safety (non inferiority)• Time to first occurrence of adjudicated MACE (composite of all-cause mortality, non-fatal MI and non-fatal stroke)
• To compare daprodustat with darbepoetin alfa for Hb efficacy (non inferiority)• Mean change in Hb between baseline and EP (mean over Weeks 28 to 52)
Principal secondary objectivesPrincipal secondary endpoints(tested for superiority, adjusted for multiplicity)
• To compare daprodustat with darbepoetin alfa on CV safety endpoints

• Time to first occurrence of adjudicated

- MACE

- MACE or a thromboembolic event (vascular access thrombosis, symptomatic deep vein thrombosis or symptomatic pulmonary embolism)

- MACE or a hospitalization for heart failure

• To compare daprodustat with darbepoetin alfa on the progression of CKD• Time to progression of CKDa
Secondary objectivesSecondary endpoints(tested for superiorityb, no multiplicity adjustment)
• To compare daprodustat with darbepoetin alfa on additional CV safety endpoints

• All-cause mortality, CV mortality, fatal or non-fatal MI, fatal or non-fatal strokec

• MACE or hospitalization for heart failurec (recurrent events analysis)

• CV mortality or non-fatal MIc

• All-cause hospitalization

• All-cause hospital re-admission within 30 days

• MACE or hospitalization for heart failure or thromboembolic eventsc

• Hospitalization for heart failurec

• Thromboembolic eventsc

• Individual components of CKD progressionc

• To compare daprodustat with darbepoetin alfa on Hb variability

• Hb change from baseline to Week 52b

N (%) responders, defined as mean Hb within the Hb analysis range 10–11.5 g/dL during EPd

• Percent time Hb in analysis range (10–11.5 g/dL) during the evaluation period (EP, Weeks 28–52) and during the maintenance phase (MP; Weeks 28 to end of trial) (non-inferiority analysis that will use a margin of 15% less time in range)b
• To compare daprodustat with darbepoetin alfa on BP

• Change from baseline in SBP, DBP and MAP at Week 52 and at end of treatment

• Number of BP exacerbation events per 100 patient-years

N (%) with at least one BP exacerbation event during study

• To compare daprodustat with darbepoetin alfa on the time to rescue (defined as permanently stopping randomized treatment due to meeting rescue criteria)• Time to stopping randomized treatment due to meeting rescue criteria
• To compare daprodustat with darbepoetin alfa on HRQoL and utility score

• Mean change in SF-36 HRQoL scores (PCS, MCS and eight health domains) between baseline and Weeks 8, 12, 28 and 52; of particular interest are the changes from baseline in the vitality and physical functioning domains at Week 28 and 52.

• Change from baseline in Health Utility (EQ-5D-5L) score at Week 52

• Change from baseline in EQ VAS at Week 52

• To compare daprodustat with darbepoetin alfa on the symptom severity and change

• Change from Baseline at Weeks 8, 12, 28 and 52 by domain and overall symptom score on the CKD-AQ

• Change from Baseline at Week 8,12, 28 and 52 in PGI-S

ObjectivesEndpoints
Co-primary objectives

Co-primary endpoints

(tested in parallel for non-inferiority)

• To compare daprodustat with darbepoetin alfa for CV safety (non inferiority)• Time to first occurrence of adjudicated MACE (composite of all-cause mortality, non-fatal MI and non-fatal stroke)
• To compare daprodustat with darbepoetin alfa for Hb efficacy (non inferiority)• Mean change in Hb between baseline and EP (mean over Weeks 28 to 52)
Principal secondary objectivesPrincipal secondary endpoints(tested for superiority, adjusted for multiplicity)
• To compare daprodustat with darbepoetin alfa on CV safety endpoints

• Time to first occurrence of adjudicated

- MACE

- MACE or a thromboembolic event (vascular access thrombosis, symptomatic deep vein thrombosis or symptomatic pulmonary embolism)

- MACE or a hospitalization for heart failure

• To compare daprodustat with darbepoetin alfa on the progression of CKD• Time to progression of CKDa
Secondary objectivesSecondary endpoints(tested for superiorityb, no multiplicity adjustment)
• To compare daprodustat with darbepoetin alfa on additional CV safety endpoints

• All-cause mortality, CV mortality, fatal or non-fatal MI, fatal or non-fatal strokec

• MACE or hospitalization for heart failurec (recurrent events analysis)

• CV mortality or non-fatal MIc

• All-cause hospitalization

• All-cause hospital re-admission within 30 days

• MACE or hospitalization for heart failure or thromboembolic eventsc

• Hospitalization for heart failurec

• Thromboembolic eventsc

• Individual components of CKD progressionc

• To compare daprodustat with darbepoetin alfa on Hb variability

• Hb change from baseline to Week 52b

N (%) responders, defined as mean Hb within the Hb analysis range 10–11.5 g/dL during EPd

• Percent time Hb in analysis range (10–11.5 g/dL) during the evaluation period (EP, Weeks 28–52) and during the maintenance phase (MP; Weeks 28 to end of trial) (non-inferiority analysis that will use a margin of 15% less time in range)b
• To compare daprodustat with darbepoetin alfa on BP

• Change from baseline in SBP, DBP and MAP at Week 52 and at end of treatment

• Number of BP exacerbation events per 100 patient-years

N (%) with at least one BP exacerbation event during study

• To compare daprodustat with darbepoetin alfa on the time to rescue (defined as permanently stopping randomized treatment due to meeting rescue criteria)• Time to stopping randomized treatment due to meeting rescue criteria
• To compare daprodustat with darbepoetin alfa on HRQoL and utility score

• Mean change in SF-36 HRQoL scores (PCS, MCS and eight health domains) between baseline and Weeks 8, 12, 28 and 52; of particular interest are the changes from baseline in the vitality and physical functioning domains at Week 28 and 52.

• Change from baseline in Health Utility (EQ-5D-5L) score at Week 52

• Change from baseline in EQ VAS at Week 52

• To compare daprodustat with darbepoetin alfa on the symptom severity and change

• Change from Baseline at Weeks 8, 12, 28 and 52 by domain and overall symptom score on the CKD-AQ

• Change from Baseline at Week 8,12, 28 and 52 in PGI-S

BP, blood pressure; CKD-AQ, Chronic Kidney Disease-Anaemia Questionnaire; CV, cardiovascular; DBP, diastolic BP; EP, evaluation phase; EQ-5D-5L,  EuroQoL 5-dimension 5-level; EQ VAS, EuroQoL visual analogue scale; Hb, haemoglobin; HRQoL, health-related quality of life; MACE, major adverse cardiac event; MAP, mean arterial pressure; MCS, mental component score; MP, maintenance phase; PCS, physical component score; PGI-S, patient global impression of severity; SBP, systolic BP; SF-36, 36-item Short Form.

Conversion factor from g/dL to g/L is 10 and from g/dL to mmol/L is 0.6206 (e.g. Hb of 10–11 g/dL is equivalent to 100–110 g/L or 6.2–6.8 mmol/L).

a

Progression of CKD defined as 40% decline in eGFR from baseline (confirmed 4–13 weeks later) or end-stage renal disease as defined by initiating chronic dialysis for ≥90 days or not initiating chronic dialysis when dialysis is indicated or kidney transplantation.

b

Hb change from baseline to Week 52 is tested for non-inferiority using the −0.75 g/dL margin used in the co-primary analysis. % time in range is tested first for non-inferiority, then for superiority.

c

Events adjudicated; for CKD progression only, two components to be adjudicated.

d

To account for within-subject variability, 0.5 g/dL was added to the upper end of the target range to create a defined analysis range of 10.0–11.5 g/dL.

Table 4.

Primary and secondary objectives and endpoints

ObjectivesEndpoints
Co-primary objectives

Co-primary endpoints

(tested in parallel for non-inferiority)

• To compare daprodustat with darbepoetin alfa for CV safety (non inferiority)• Time to first occurrence of adjudicated MACE (composite of all-cause mortality, non-fatal MI and non-fatal stroke)
• To compare daprodustat with darbepoetin alfa for Hb efficacy (non inferiority)• Mean change in Hb between baseline and EP (mean over Weeks 28 to 52)
Principal secondary objectivesPrincipal secondary endpoints(tested for superiority, adjusted for multiplicity)
• To compare daprodustat with darbepoetin alfa on CV safety endpoints

• Time to first occurrence of adjudicated

- MACE

- MACE or a thromboembolic event (vascular access thrombosis, symptomatic deep vein thrombosis or symptomatic pulmonary embolism)

- MACE or a hospitalization for heart failure

• To compare daprodustat with darbepoetin alfa on the progression of CKD• Time to progression of CKDa
Secondary objectivesSecondary endpoints(tested for superiorityb, no multiplicity adjustment)
• To compare daprodustat with darbepoetin alfa on additional CV safety endpoints

• All-cause mortality, CV mortality, fatal or non-fatal MI, fatal or non-fatal strokec

• MACE or hospitalization for heart failurec (recurrent events analysis)

• CV mortality or non-fatal MIc

• All-cause hospitalization

• All-cause hospital re-admission within 30 days

• MACE or hospitalization for heart failure or thromboembolic eventsc

• Hospitalization for heart failurec

• Thromboembolic eventsc

• Individual components of CKD progressionc

• To compare daprodustat with darbepoetin alfa on Hb variability

• Hb change from baseline to Week 52b

N (%) responders, defined as mean Hb within the Hb analysis range 10–11.5 g/dL during EPd

• Percent time Hb in analysis range (10–11.5 g/dL) during the evaluation period (EP, Weeks 28–52) and during the maintenance phase (MP; Weeks 28 to end of trial) (non-inferiority analysis that will use a margin of 15% less time in range)b
• To compare daprodustat with darbepoetin alfa on BP

• Change from baseline in SBP, DBP and MAP at Week 52 and at end of treatment

• Number of BP exacerbation events per 100 patient-years

N (%) with at least one BP exacerbation event during study

• To compare daprodustat with darbepoetin alfa on the time to rescue (defined as permanently stopping randomized treatment due to meeting rescue criteria)• Time to stopping randomized treatment due to meeting rescue criteria
• To compare daprodustat with darbepoetin alfa on HRQoL and utility score

• Mean change in SF-36 HRQoL scores (PCS, MCS and eight health domains) between baseline and Weeks 8, 12, 28 and 52; of particular interest are the changes from baseline in the vitality and physical functioning domains at Week 28 and 52.

• Change from baseline in Health Utility (EQ-5D-5L) score at Week 52

• Change from baseline in EQ VAS at Week 52

• To compare daprodustat with darbepoetin alfa on the symptom severity and change

• Change from Baseline at Weeks 8, 12, 28 and 52 by domain and overall symptom score on the CKD-AQ

• Change from Baseline at Week 8,12, 28 and 52 in PGI-S

ObjectivesEndpoints
Co-primary objectives

Co-primary endpoints

(tested in parallel for non-inferiority)

• To compare daprodustat with darbepoetin alfa for CV safety (non inferiority)• Time to first occurrence of adjudicated MACE (composite of all-cause mortality, non-fatal MI and non-fatal stroke)
• To compare daprodustat with darbepoetin alfa for Hb efficacy (non inferiority)• Mean change in Hb between baseline and EP (mean over Weeks 28 to 52)
Principal secondary objectivesPrincipal secondary endpoints(tested for superiority, adjusted for multiplicity)
• To compare daprodustat with darbepoetin alfa on CV safety endpoints

• Time to first occurrence of adjudicated

- MACE

- MACE or a thromboembolic event (vascular access thrombosis, symptomatic deep vein thrombosis or symptomatic pulmonary embolism)

- MACE or a hospitalization for heart failure

• To compare daprodustat with darbepoetin alfa on the progression of CKD• Time to progression of CKDa
Secondary objectivesSecondary endpoints(tested for superiorityb, no multiplicity adjustment)
• To compare daprodustat with darbepoetin alfa on additional CV safety endpoints

• All-cause mortality, CV mortality, fatal or non-fatal MI, fatal or non-fatal strokec

• MACE or hospitalization for heart failurec (recurrent events analysis)

• CV mortality or non-fatal MIc

• All-cause hospitalization

• All-cause hospital re-admission within 30 days

• MACE or hospitalization for heart failure or thromboembolic eventsc

• Hospitalization for heart failurec

• Thromboembolic eventsc

• Individual components of CKD progressionc

• To compare daprodustat with darbepoetin alfa on Hb variability

• Hb change from baseline to Week 52b

N (%) responders, defined as mean Hb within the Hb analysis range 10–11.5 g/dL during EPd

• Percent time Hb in analysis range (10–11.5 g/dL) during the evaluation period (EP, Weeks 28–52) and during the maintenance phase (MP; Weeks 28 to end of trial) (non-inferiority analysis that will use a margin of 15% less time in range)b
• To compare daprodustat with darbepoetin alfa on BP

• Change from baseline in SBP, DBP and MAP at Week 52 and at end of treatment

• Number of BP exacerbation events per 100 patient-years

N (%) with at least one BP exacerbation event during study

• To compare daprodustat with darbepoetin alfa on the time to rescue (defined as permanently stopping randomized treatment due to meeting rescue criteria)• Time to stopping randomized treatment due to meeting rescue criteria
• To compare daprodustat with darbepoetin alfa on HRQoL and utility score

• Mean change in SF-36 HRQoL scores (PCS, MCS and eight health domains) between baseline and Weeks 8, 12, 28 and 52; of particular interest are the changes from baseline in the vitality and physical functioning domains at Week 28 and 52.

• Change from baseline in Health Utility (EQ-5D-5L) score at Week 52

• Change from baseline in EQ VAS at Week 52

• To compare daprodustat with darbepoetin alfa on the symptom severity and change

• Change from Baseline at Weeks 8, 12, 28 and 52 by domain and overall symptom score on the CKD-AQ

• Change from Baseline at Week 8,12, 28 and 52 in PGI-S

BP, blood pressure; CKD-AQ, Chronic Kidney Disease-Anaemia Questionnaire; CV, cardiovascular; DBP, diastolic BP; EP, evaluation phase; EQ-5D-5L,  EuroQoL 5-dimension 5-level; EQ VAS, EuroQoL visual analogue scale; Hb, haemoglobin; HRQoL, health-related quality of life; MACE, major adverse cardiac event; MAP, mean arterial pressure; MCS, mental component score; MP, maintenance phase; PCS, physical component score; PGI-S, patient global impression of severity; SBP, systolic BP; SF-36, 36-item Short Form.

Conversion factor from g/dL to g/L is 10 and from g/dL to mmol/L is 0.6206 (e.g. Hb of 10–11 g/dL is equivalent to 100–110 g/L or 6.2–6.8 mmol/L).

a

Progression of CKD defined as 40% decline in eGFR from baseline (confirmed 4–13 weeks later) or end-stage renal disease as defined by initiating chronic dialysis for ≥90 days or not initiating chronic dialysis when dialysis is indicated or kidney transplantation.

b

Hb change from baseline to Week 52 is tested for non-inferiority using the −0.75 g/dL margin used in the co-primary analysis. % time in range is tested first for non-inferiority, then for superiority.

c

Events adjudicated; for CKD progression only, two components to be adjudicated.

d

To account for within-subject variability, 0.5 g/dL was added to the upper end of the target range to create a defined analysis range of 10.0–11.5 g/dL.

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