Trial Outcomes & Findings for Safety and Efficacy of CTAP101 to Treat Secondary Hyperparathyroidism in Stage 3 or 4 CKD and Vitamin D Insufficiency (NCT NCT01704079)

NCT ID: NCT01704079

Last Updated: 2025-01-13

Results Overview

Number of subjects in the intent to treat population attaining mean decrease in plasma intact Parathyroid Hormone (iPTH) of ≥30% from P\\pre-treatment baseline in the efficacy assessment phase (EAP) referred to as responders

Recruitment status

COMPLETED

Study phase

PHASE3

Target enrollment

216 participants

Primary outcome timeframe

Approximately 6 months

Results posted on

2025-01-13

Participant Flow

This multicenter study was conducted at 45 investigational sites within the US. Subjects were enrolled and treated from 04 February 2013 through 13 August 2014.

Subjects were stratified by CKD stage and were randomized in a 2:1 ratio to receive a daily 30 μg oral dose of CTAP101 capsules (or matching placebo) for 12 weeks at bedtime. Subjects presenting on a regimen of bone metabolism therapy were to discontinue their prior treatment for at least 28 days' washout (except for bisphosphonates).

Participant milestones

Participant milestones
Measure
Sugar Pill to CTAP101 30 μg
1 sugar pill to CTAP101 30 μg capsule daily at bedtime for 12 weeks, with an increase to 2 sugar pills to CTAP101 30 μg capsules daily at bedtime for weeks 13-26. Sugar pill to CTAP101 30 μg capsules: Sugar pill capsule (placebo to CTAP101 30 μg capsule) taken daily at bedtime.
CTAP101 30 μg Capsules
1 CTAP101 30 μg capsule daily at bedtime for 12 weeks, with a possible increase to 2 CTAP101 30 μg capsules daily at bedtime for study duration, if needed (26 weeks total). Subjects not requiring a dose increase after 12 weeks would receive 1 CTAP101 30 μg capsule and one sugar pill (to CTAP101 30 μg capsule) for weeks 13-26. CTAP101 30 μg capsules: CTAP101 30 μg capsule taken daily at bedtime Sugar pill to CTAP101 30 μg capsules: Sugar pill capsule (placebo to CTAP101 30 μg capsule) taken daily at bedtime.
Overall Study
STARTED
72
144
Overall Study
Entered Extension Study
53
102
Overall Study
COMPLETED
58
121
Overall Study
NOT COMPLETED
14
23

Reasons for withdrawal

Reasons for withdrawal
Measure
Sugar Pill to CTAP101 30 μg
1 sugar pill to CTAP101 30 μg capsule daily at bedtime for 12 weeks, with an increase to 2 sugar pills to CTAP101 30 μg capsules daily at bedtime for weeks 13-26. Sugar pill to CTAP101 30 μg capsules: Sugar pill capsule (placebo to CTAP101 30 μg capsule) taken daily at bedtime.
CTAP101 30 μg Capsules
1 CTAP101 30 μg capsule daily at bedtime for 12 weeks, with a possible increase to 2 CTAP101 30 μg capsules daily at bedtime for study duration, if needed (26 weeks total). Subjects not requiring a dose increase after 12 weeks would receive 1 CTAP101 30 μg capsule and one sugar pill (to CTAP101 30 μg capsule) for weeks 13-26. CTAP101 30 μg capsules: CTAP101 30 μg capsule taken daily at bedtime Sugar pill to CTAP101 30 μg capsules: Sugar pill capsule (placebo to CTAP101 30 μg capsule) taken daily at bedtime.
Overall Study
Withdrawal by Subject
5
7
Overall Study
Lost to Follow-up
2
5
Overall Study
Adverse Event
4
7
Overall Study
Protocol Violation
1
0
Overall Study
Subject noncompliance
2
3
Overall Study
Serum Calcium >/= 11.0 mg/dL, repeat con
0
1

Baseline Characteristics

Safety and Efficacy of CTAP101 to Treat Secondary Hyperparathyroidism in Stage 3 or 4 CKD and Vitamin D Insufficiency

Baseline characteristics by cohort

Baseline characteristics by cohort
Measure
Sugar Pill to CTAP101 30 μg
n=72 Participants
1 sugar pill to CTAP101 30 μg capsule daily at bedtime for 12 weeks, with an increase to 2 sugar pills to CTAP101 30 μg capsules daily at bedtime for weeks 13-26. Sugar pill to CTAP101 30 μg capsules: Sugar pill capsule (placebo to CTAP101 30 μg capsule) taken daily at bedtime.
CTAP101 30 μg Capsules
n=144 Participants
1 CTAP101 30 μg capsule daily at bedtime for 12 weeks, with a possible increase to 2 CTAP101 30 μg capsules daily at bedtime for study duration, if needed (26 weeks total). Subjects not requiring a dose increase after 12 weeks would receive 1 CTAP101 30 μg capsule and one sugar pill (to CTAP101 30 μg capsule) for weeks 13-26. CTAP101 30 μg capsules: CTAP101 30 μg capsule taken daily at bedtime Sugar pill to CTAP101 30 μg capsules: Sugar pill capsule (placebo to CTAP101 30 μg capsule) taken daily at bedtime.
Total
n=216 Participants
Total of all reporting groups
Age, Continuous
65.3 years
STANDARD_DEVIATION 10.06 • n=5 Participants
66.8 years
STANDARD_DEVIATION 10.90 • n=7 Participants
66.3 years
STANDARD_DEVIATION 10.63 • n=5 Participants
Sex: Female, Male
Female
39 Participants
n=5 Participants
71 Participants
n=7 Participants
110 Participants
n=5 Participants
Sex: Female, Male
Male
33 Participants
n=5 Participants
73 Participants
n=7 Participants
106 Participants
n=5 Participants
Region of Enrollment
United States
72 participants
n=5 Participants
144 participants
n=7 Participants
216 participants
n=5 Participants

PRIMARY outcome

Timeframe: Approximately 6 months

Population: Intent to treat

Number of subjects in the intent to treat population attaining mean decrease in plasma intact Parathyroid Hormone (iPTH) of ≥30% from P\\pre-treatment baseline in the efficacy assessment phase (EAP) referred to as responders

Outcome measures

Outcome measures
Measure
Sugar Pill to CTAP101 30 μg
n=72 Participants
1 sugar pill to CTAP101 30 μg capsule daily at bedtime for 12 weeks, with an increase to 2 sugar pills to CTAP101 30 μg capsules daily at bedtime for weeks 13-26. Sugar pill to CTAP101 30 μg capsules: Sugar pill capsule (placebo to CTAP101 30 μg capsule) taken daily at bedtime.
CTAP101 30 μg Capsules
n=144 Participants
1 CTAP101 30 μg capsule daily at bedtime for 12 weeks, with a possible increase to 2 CTAP101 30 μg capsules daily at bedtime for study duration, if needed (26 weeks total). Subjects not requiring a dose increase after 12 weeks would receive 1 CTAP101 30 μg capsule and one sugar pill (to CTAP101 30 μg capsule) for weeks 13-26. CTAP101 30 μg capsules: CTAP101 30 μg capsule taken daily at bedtime Sugar pill to CTAP101 30 μg capsules: Sugar pill capsule (placebo to CTAP101 30 μg capsule) taken daily at bedtime.
Number of Participants in the Intent to Treat Population With Decrease in Plasma Intact Parathyroid Hormone (iPTH) of ≥30% From Pre-treatment Baseline
5 participants
49 participants

SECONDARY outcome

Timeframe: Approximately 6 months

Population: Per protocol

Number of subjects in the per protocol population attaining a mean decrease in plasma intact parathyroid hormone (iPTH) of ≥30% from pre-treatment baseline in the efficacy assessment phase (EAP), referred to as responders

Outcome measures

Outcome measures
Measure
Sugar Pill to CTAP101 30 μg
n=60 Participants
1 sugar pill to CTAP101 30 μg capsule daily at bedtime for 12 weeks, with an increase to 2 sugar pills to CTAP101 30 μg capsules daily at bedtime for weeks 13-26. Sugar pill to CTAP101 30 μg capsules: Sugar pill capsule (placebo to CTAP101 30 μg capsule) taken daily at bedtime.
CTAP101 30 μg Capsules
n=119 Participants
1 CTAP101 30 μg capsule daily at bedtime for 12 weeks, with a possible increase to 2 CTAP101 30 μg capsules daily at bedtime for study duration, if needed (26 weeks total). Subjects not requiring a dose increase after 12 weeks would receive 1 CTAP101 30 μg capsule and one sugar pill (to CTAP101 30 μg capsule) for weeks 13-26. CTAP101 30 μg capsules: CTAP101 30 μg capsule taken daily at bedtime Sugar pill to CTAP101 30 μg capsules: Sugar pill capsule (placebo to CTAP101 30 μg capsule) taken daily at bedtime.
Number of Participants in the Per Protocol Population With Decrease in Plasma Intact Parathyroid Hormone (iPTH) of ≥30% From Pre-treatment Baseline
5 participants
47 participants

SECONDARY outcome

Timeframe: Approximately 6 months

Population: Intent to treat

Subjects in the intent to treat population with normal serum total 25-hydroxyvitamin D (\>/= 30 ng/dL)

Outcome measures

Outcome measures
Measure
Sugar Pill to CTAP101 30 μg
n=72 Participants
1 sugar pill to CTAP101 30 μg capsule daily at bedtime for 12 weeks, with an increase to 2 sugar pills to CTAP101 30 μg capsules daily at bedtime for weeks 13-26. Sugar pill to CTAP101 30 μg capsules: Sugar pill capsule (placebo to CTAP101 30 μg capsule) taken daily at bedtime.
CTAP101 30 μg Capsules
n=144 Participants
1 CTAP101 30 μg capsule daily at bedtime for 12 weeks, with a possible increase to 2 CTAP101 30 μg capsules daily at bedtime for study duration, if needed (26 weeks total). Subjects not requiring a dose increase after 12 weeks would receive 1 CTAP101 30 μg capsule and one sugar pill (to CTAP101 30 μg capsule) for weeks 13-26. CTAP101 30 μg capsules: CTAP101 30 μg capsule taken daily at bedtime Sugar pill to CTAP101 30 μg capsules: Sugar pill capsule (placebo to CTAP101 30 μg capsule) taken daily at bedtime.
Subjects in the Intent to Treat Population With Normal Serum Total 25-hydroxyvitamin D
5 participants
120 participants

SECONDARY outcome

Timeframe: Approximately 6 months

Population: Per protocol

Subjects in the per protocol population with normal serum total 25-hydroxyvitamin D (\>/= 30 ng/mL)

Outcome measures

Outcome measures
Measure
Sugar Pill to CTAP101 30 μg
n=60 Participants
1 sugar pill to CTAP101 30 μg capsule daily at bedtime for 12 weeks, with an increase to 2 sugar pills to CTAP101 30 μg capsules daily at bedtime for weeks 13-26. Sugar pill to CTAP101 30 μg capsules: Sugar pill capsule (placebo to CTAP101 30 μg capsule) taken daily at bedtime.
CTAP101 30 μg Capsules
n=119 Participants
1 CTAP101 30 μg capsule daily at bedtime for 12 weeks, with a possible increase to 2 CTAP101 30 μg capsules daily at bedtime for study duration, if needed (26 weeks total). Subjects not requiring a dose increase after 12 weeks would receive 1 CTAP101 30 μg capsule and one sugar pill (to CTAP101 30 μg capsule) for weeks 13-26. CTAP101 30 μg capsules: CTAP101 30 μg capsule taken daily at bedtime Sugar pill to CTAP101 30 μg capsules: Sugar pill capsule (placebo to CTAP101 30 μg capsule) taken daily at bedtime.
Subjects in the Per Protocol Population With Normal Serum Total 25-hydroxyvitamin D
5 participants
116 participants

Adverse Events

Sugar Pill to CTAP101 30 μg

Serious events: 11 serious events
Other events: 18 other events
Deaths: 0 deaths

CTAP101 30 μg Capsules

Serious events: 22 serious events
Other events: 32 other events
Deaths: 0 deaths

Serious adverse events

Serious adverse events
Measure
Sugar Pill to CTAP101 30 μg
n=72 participants at risk
1 sugar pill to CTAP101 30 μg capsule daily at bedtime for 12 weeks, with an increase to 2 sugar pills to CTAP101 30 μg capsules daily at bedtime for weeks 13-26. Sugar pill to CTAP101 30 μg capsules: Sugar pill capsule (placebo to CTAP101 30 μg capsule) taken daily at bedtime.
CTAP101 30 μg Capsules
n=144 participants at risk
1 CTAP101 30 μg capsule daily at bedtime for 12 weeks, with a possible increase to 2 CTAP101 30 μg capsules daily at bedtime for study duration, if needed (26 weeks total). Subjects not requiring a dose increase after 12 weeks would receive 1 CTAP101 30 μg capsule and one sugar pill (to CTAP101 30 μg capsule) for weeks 13-26. CTAP101 30 μg capsules: CTAP101 30 μg capsule taken daily at bedtime Sugar pill to CTAP101 30 μg capsules: Sugar pill capsule (placebo to CTAP101 30 μg capsule) taken daily at bedtime.
Blood and lymphatic system disorders
Anaemia
0.00%
0/72 • 6 months from randomization to end of therapy
1.4%
2/144 • Number of events 2 • 6 months from randomization to end of therapy
Cardiac disorders
Acute myocardial infarction
1.4%
1/72 • Number of events 1 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Cardiac disorders
Cardiac arrest
0.00%
0/72 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Cardiac disorders
Cardiac disorder
0.00%
0/72 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Cardiac disorders
Cardiac failure
1.4%
1/72 • Number of events 1 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Cardiac disorders
Cardiac failure acute
0.00%
0/72 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Cardiac disorders
Cardiac failure congestive
0.00%
0/72 • 6 months from randomization to end of therapy
2.1%
3/144 • Number of events 3 • 6 months from randomization to end of therapy
Cardiac disorders
Myocardial infarction
0.00%
0/72 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
General disorders
Asthenia
1.4%
1/72 • Number of events 1 • 6 months from randomization to end of therapy
0.00%
0/144 • 6 months from randomization to end of therapy
General disorders
Chest pain
1.4%
1/72 • Number of events 1 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
General disorders
Device malfunction
0.00%
0/72 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Hepatobiliary disorders
Cholelitiasis
0.00%
0/72 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Infections and infestations
Cellulitis
1.4%
1/72 • Number of events 1 • 6 months from randomization to end of therapy
0.00%
0/144 • 6 months from randomization to end of therapy
Infections and infestations
Localized infection
0.00%
0/72 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Infections and infestations
Pneumonia
1.4%
1/72 • Number of events 1 • 6 months from randomization to end of therapy
2.1%
3/144 • Number of events 3 • 6 months from randomization to end of therapy
Infections and infestations
Pneumonia bacterial
1.4%
1/72 • Number of events 1 • 6 months from randomization to end of therapy
0.00%
0/144 • 6 months from randomization to end of therapy
Infections and infestations
Sepsis
2.8%
2/72 • Number of events 2 • 6 months from randomization to end of therapy
0.00%
0/144 • 6 months from randomization to end of therapy
Infections and infestations
Urinary tract infection
0.00%
0/72 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Injury, poisoning and procedural complications
Fall
0.00%
0/72 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Investigations
Blood creatinine increased
0.00%
0/72 • 6 months from randomization to end of therapy
2.1%
3/144 • Number of events 3 • 6 months from randomization to end of therapy
Metabolism and nutrition disorders
Dehydration
2.8%
2/72 • Number of events 2 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Metabolism and nutrition disorders
Fluid overload
0.00%
0/72 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Metabolism and nutrition disorders
Hyperkalaemia
1.4%
1/72 • Number of events 1 • 6 months from randomization to end of therapy
1.4%
2/144 • Number of events 2 • 6 months from randomization to end of therapy
Metabolism and nutrition disorders
Hypoglycaemia
0.00%
0/72 • 6 months from randomization to end of therapy
1.4%
2/144 • Number of events 2 • 6 months from randomization to end of therapy
Musculoskeletal and connective tissue disorders
Musculoskeletal chest pain
1.4%
1/72 • Number of events 1 • 6 months from randomization to end of therapy
0.00%
0/144 • 6 months from randomization to end of therapy
Musculoskeletal and connective tissue disorders
Rhabdomyolysis
0.00%
0/72 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Nervous system disorders
Cerebrovascular accident
1.4%
1/72 • Number of events 1 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Nervous system disorders
Dizziness
0.00%
0/72 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Nervous system disorders
Encephalopathy
0.00%
0/72 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Nervous system disorders
Myasthenia gravis crisis
0.00%
0/72 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Nervous system disorders
Status epilepticus
1.4%
1/72 • Number of events 1 • 6 months from randomization to end of therapy
0.00%
0/144 • 6 months from randomization to end of therapy
Nervous system disorders
Syncope
0.00%
0/72 • 6 months from randomization to end of therapy
1.4%
2/144 • Number of events 2 • 6 months from randomization to end of therapy
Nervous system disorders
Thalamic infarction
1.4%
1/72 • Number of events 1 • 6 months from randomization to end of therapy
0.00%
0/144 • 6 months from randomization to end of therapy
Psychiatric disorders
Mental status changes
1.4%
1/72 • Number of events 1 • 6 months from randomization to end of therapy
0.00%
0/144 • 6 months from randomization to end of therapy
Renal and urinary disorders
Urinary tract obstruction
0.00%
0/72 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Respiratory, thoracic and mediastinal disorders
Acute pulmonary oedema
1.4%
1/72 • Number of events 1 • 6 months from randomization to end of therapy
0.00%
0/144 • 6 months from randomization to end of therapy
Respiratory, thoracic and mediastinal disorders
Acute respiratory failure
0.00%
0/72 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Respiratory, thoracic and mediastinal disorders
Respiratory failure
1.4%
1/72 • Number of events 1 • 6 months from randomization to end of therapy
0.00%
0/144 • 6 months from randomization to end of therapy
Skin and subcutaneous tissue disorders
Angioedema
0.00%
0/72 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Vascular disorders
Deep vein thrombosis
0.00%
0/72 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Vascular disorders
Hypertensive emergency
0.00%
0/72 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy

Other adverse events

Other adverse events
Measure
Sugar Pill to CTAP101 30 μg
n=72 participants at risk
1 sugar pill to CTAP101 30 μg capsule daily at bedtime for 12 weeks, with an increase to 2 sugar pills to CTAP101 30 μg capsules daily at bedtime for weeks 13-26. Sugar pill to CTAP101 30 μg capsules: Sugar pill capsule (placebo to CTAP101 30 μg capsule) taken daily at bedtime.
CTAP101 30 μg Capsules
n=144 participants at risk
1 CTAP101 30 μg capsule daily at bedtime for 12 weeks, with a possible increase to 2 CTAP101 30 μg capsules daily at bedtime for study duration, if needed (26 weeks total). Subjects not requiring a dose increase after 12 weeks would receive 1 CTAP101 30 μg capsule and one sugar pill (to CTAP101 30 μg capsule) for weeks 13-26. CTAP101 30 μg capsules: CTAP101 30 μg capsule taken daily at bedtime Sugar pill to CTAP101 30 μg capsules: Sugar pill capsule (placebo to CTAP101 30 μg capsule) taken daily at bedtime.
Gastrointestinal disorders
Constipation
5.6%
4/72 • Number of events 4 • 6 months from randomization to end of therapy
3.5%
5/144 • Number of events 5 • 6 months from randomization to end of therapy
General disorders
Oedema peripheral
4.2%
3/72 • Number of events 3 • 6 months from randomization to end of therapy
6.2%
9/144 • Number of events 9 • 6 months from randomization to end of therapy
Infections and infestations
Nasopharyngitis
1.4%
1/72 • Number of events 1 • 6 months from randomization to end of therapy
5.6%
8/144 • Number of events 8 • 6 months from randomization to end of therapy
Metabolism and nutrition disorders
Gout
6.9%
5/72 • Number of events 5 • 6 months from randomization to end of therapy
4.2%
6/144 • Number of events 6 • 6 months from randomization to end of therapy
Metabolism and nutrition disorders
Metabolic acidosis
5.6%
4/72 • Number of events 4 • 6 months from randomization to end of therapy
0.69%
1/144 • Number of events 1 • 6 months from randomization to end of therapy
Musculoskeletal and connective tissue disorders
Pain in extremity
5.6%
4/72 • Number of events 4 • 6 months from randomization to end of therapy
2.1%
3/144 • Number of events 3 • 6 months from randomization to end of therapy
Vascular disorders
Hypertension
8.3%
6/72 • Number of events 6 • 6 months from randomization to end of therapy
5.6%
8/144 • Number of events 8 • 6 months from randomization to end of therapy

Additional Information

Douglass Laidlaw, PhD, Vice President, Medical Affairs

OPKO Health, Inc.

Phone: 305-575-4172

Results disclosure agreements

  • Principal investigator is a sponsor employee
  • Publication restrictions are in place

Restriction type: LTE60