Trial Outcomes & Findings for Safety and Efficacy of CTAP101 to Treat Secondary Hyperparathyroidism in Stage 3 or 4 CKD and Vitamin D Insufficiency (NCT NCT01651000)

NCT ID: NCT01651000

Last Updated: 2025-01-13

Results Overview

Number of subjects in the intent to treat 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.

Recruitment status

COMPLETED

Study phase

PHASE3

Target enrollment

213 participants

Primary outcome timeframe

Approximately 6 months

Results posted on

2025-01-13

Participant Flow

This multicenter study was conducted at 44 investigational sites within the US. Subjects were enrolled and treated from 07 September 2012 through 20 July 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 Capsule
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 in a blinded fashion 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
141
Overall Study
Entered Extension Study
50
93
Overall Study
COMPLETED
62
113
Overall Study
NOT COMPLETED
10
28

Reasons for withdrawal

Reasons for withdrawal
Measure
Sugar Pill to CTAP101 30 μg Capsule
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 in a blinded fashion 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
Adverse Event
2
8
Overall Study
Lost to Follow-up
3
2
Overall Study
Protocol Violation
0
3
Overall Study
Withdrawal by Subject
2
10
Overall Study
Subject noncompliance
0
3
Overall Study
Lack of Efficacy
1
1
Overall Study
Physician Decision
1
0
Overall Study
Administrative reason
1
0
Overall Study
Serum Ca >/= 11.0 mg/dL, repeat confirm
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 Capsule
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=141 Participants
1 CTAP101 30 μg capsule daily at bedtime for 12 weeks, with a possible increase in a blinded fashion 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=213 Participants
Total of all reporting groups
Age, Continuous
64.4 years
STANDARD_DEVIATION 12.74 • n=5 Participants
65.1 years
STANDARD_DEVIATION 10.33 • n=7 Participants
64.9 years
STANDARD_DEVIATION 11.18 • n=5 Participants
Sex: Female, Male
Female
33 Participants
n=5 Participants
71 Participants
n=7 Participants
104 Participants
n=5 Participants
Sex: Female, Male
Male
39 Participants
n=5 Participants
70 Participants
n=7 Participants
109 Participants
n=5 Participants
Region of Enrollment
United States
72 participants
n=5 Participants
141 participants
n=7 Participants
213 participants
n=5 Participants

PRIMARY outcome

Timeframe: Approximately 6 months

Population: Intent to treat

Number of subjects in the intent to treat 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 Capsule
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=141 Participants
1 CTAP101 30 μg capsule daily at bedtime for 12 weeks, with a possible increase in a blinded fashion 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 Values
6 participants
46 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 Capsule
n=62 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=115 Participants
1 CTAP101 30 μg capsule daily at bedtime for 12 weeks, with a possible increase in a blinded fashion 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 Values
5 participants
46 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 Capsule
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=141 Participants
1 CTAP101 30 μg capsule daily at bedtime for 12 weeks, with a possible increase in a blinded fashion 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
2 participants
113 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 Capsule
n=62 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=115 Participants
1 CTAP101 30 μg capsule daily at bedtime for 12 weeks, with a possible increase in a blinded fashion 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
2 participants
110 participants

Adverse Events

Sugar Pill to CTAP101 30 μg Capsule

Serious events: 12 serious events
Other events: 37 other events
Deaths: 0 deaths

CTAP101 30 μg Capsules

Serious events: 30 serious events
Other events: 44 other events
Deaths: 0 deaths

Serious adverse events

Serious adverse events
Measure
Sugar Pill to CTAP101 30 μg Capsule
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=141 participants at risk
1 CTAP101 30 μg capsule daily at bedtime for 12 weeks, with a possible increase in a blinded fashion 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.
Metabolism and nutrition disorders
Hyponatraemia
1.4%
1/72 • Number of events 1 • 6 months
0.00%
0/141 • 6 months
Metabolism and nutrition disorders
Hyperkalaemia
1.4%
1/72 • Number of events 1 • 6 months
0.00%
0/141 • 6 months
Blood and lymphatic system disorders
Anaemia
1.4%
1/72 • Number of events 1 • 6 months
1.4%
2/141 • Number of events 2 • 6 months
Cardiac disorders
Angina pectoris
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Cardiac disorders
Arrhyhmia
1.4%
1/72 • Number of events 1 • 6 months
0.00%
0/141 • 6 months
Cardiac disorders
Atrial fibrillation
0.00%
0/72 • 6 months
1.4%
2/141 • Number of events 2 • 6 months
Cardiac disorders
Cardiac arrest
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Cardiac disorders
Cardiac failure congestive
0.00%
0/72 • 6 months
4.3%
6/141 • Number of events 6 • 6 months
Cardiac disorders
Coronary artery disease
1.4%
1/72 • Number of events 1 • 6 months
0.00%
0/141 • 6 months
Gastrointestinal disorders
Colitis ischaemic
1.4%
1/72 • Number of events 1 • 6 months
0.00%
0/141 • 6 months
Gastrointestinal disorders
Gastrointestinal haemorrhage
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Gastrointestinal disorders
Lower gastrointestinal haemorrhage
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Gastrointestinal disorders
Stomatitis
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
General disorders
Asthenia
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
General disorders
Chest pain
2.8%
2/72 • Number of events 2 • 6 months
1.4%
2/141 • Number of events 2 • 6 months
General disorders
Oedema peripheral
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Hepatobiliary disorders
Cholecystitis acute
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Hepatobiliary disorders
Cholelithiasis
1.4%
1/72 • Number of events 1 • 6 months
0.00%
0/141 • 6 months
Infections and infestations
Cellulitis
1.4%
1/72 • Number of events 1 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Infections and infestations
Gastrointestinal viral infection
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Infections and infestations
Pharyngitis
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Infections and infestations
Pneumonia
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Infections and infestations
Sepsis
1.4%
1/72 • Number of events 1 • 6 months
1.4%
2/141 • Number of events 2 • 6 months
Infections and infestations
Streptococcal bacteraemia
1.4%
1/72 • Number of events 1 • 6 months
0.00%
0/141 • 6 months
Infections and infestations
Urinary tract infection
1.4%
1/72 • Number of events 1 • 6 months
0.00%
0/141 • 6 months
Infections and infestations
Urosepsis
0.00%
0/72 • 6 months
1.4%
2/141 • Number of events 2 • 6 months
Infections and infestations
Wound infection
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Injury, poisoning and procedural complications
Multiple fractures
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Injury, poisoning and procedural complications
Patella fracture
1.4%
1/72 • Number of events 1 • 6 months
0.00%
0/141 • 6 months
Injury, poisoning and procedural complications
Ulna fracture
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Investigations
Blood creatinine increased
0.00%
0/72 • 6 months
3.5%
5/141 • Number of events 5 • 6 months
Metabolism and nutrition disorders
Fluid overload
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Metabolism and nutrition disorders
Hypercalcaemia
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Metabolism and nutrition disorders
Hypervolaemia
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Metabolism and nutrition disorders
Hypovolaemia
1.4%
1/72 • Number of events 1 • 6 months
0.00%
0/141 • 6 months
Metabolism and nutrition disorders
Lactic acidosis
1.4%
1/72 • Number of events 1 • 6 months
0.00%
0/141 • 6 months
Neoplasms benign, malignant and unspecified (incl cysts and polyps)
Adenocarcinoma pancreas
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Neoplasms benign, malignant and unspecified (incl cysts and polyps)
Endometrial cancer
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Neoplasms benign, malignant and unspecified (incl cysts and polyps)
Renal cell carcinoma
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Nervous system disorders
Basal ganglia stroke
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Nervous system disorders
Cerebrovascular accident
1.4%
1/72 • Number of events 1 • 6 months
0.00%
0/141 • 6 months
Nervous system disorders
Convulsion
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Nervous system disorders
Presyncope
1.4%
1/72 • Number of events 1 • 6 months
0.00%
0/141 • 6 months
Psychiatric disorders
Suicidal ideation
1.4%
1/72 • Number of events 1 • 6 months
0.00%
0/141 • 6 months
Renal and urinary disorders
Renal failure acute
1.4%
1/72 • Number of events 1 • 6 months
1.4%
2/141 • Number of events 2 • 6 months
Reproductive system and breast disorders
Menorrhagia
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Respiratory, thoracic and mediastinal disorders
Acute respiratory failure
0.00%
0/72 • 6 months
0.71%
1/141 • 6 months
Respiratory, thoracic and mediastinal disorders
Asthma
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Respiratory, thoracic and mediastinal disorders
Chronic obstructive pulmonary disease
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Respiratory, thoracic and mediastinal disorders
Respiratory failure
1.4%
1/72 • Number of events 1 • 6 months
0.00%
0/141 • 6 months
Vascular disorders
Aortic intramural haematoma
1.4%
1/72 • Number of events 1 • 6 months
0.00%
0/141 • 6 months
Vascular disorders
Hypertension
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months
Vascular disorders
Hypertensive crisis
0.00%
0/72 • 6 months
0.71%
1/141 • Number of events 1 • 6 months

Other adverse events

Other adverse events
Measure
Sugar Pill to CTAP101 30 μg Capsule
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=141 participants at risk
1 CTAP101 30 μg capsule daily at bedtime for 12 weeks, with a possible increase in a blinded fashion 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
Diarrhoea
16.7%
12/72 • Number of events 12 • 6 months
4.3%
6/141 • Number of events 6 • 6 months
Gastrointestinal disorders
Nausea
8.3%
6/72 • Number of events 6 • 6 months
2.1%
3/141 • Number of events 3 • 6 months
Gastrointestinal disorders
Vomiting
6.9%
5/72 • Number of events 5 • 6 months
1.4%
2/141 • Number of events 2 • 6 months
General disorders
Oedema peripheral
6.9%
5/72 • Number of events 5 • 6 months
2.1%
3/141 • Number of events 3 • 6 months
General disorders
Chest pain
5.6%
4/72 • Number of events 4 • 6 months
2.1%
3/141 • Number of events 3 • 6 months
Infections and infestations
Urinary tract infection
13.9%
10/72 • Number of events 10 • 6 months
5.0%
7/141 • Number of events 7 • 6 months
Infections and infestations
Upper respiratory tract infection
5.6%
4/72 • Number of events 4 • 6 months
2.8%
4/141 • Number of events 4 • 6 months
Metabolism and nutrition disorders
Hypoglycaemia
5.6%
4/72 • Number of events 4 • 6 months
2.8%
4/141 • Number of events 4 • 6 months
Musculoskeletal and connective tissue disorders
Back pain
8.3%
6/72 • Number of events 6 • 6 months
4.3%
6/141 • Number of events 6 • 6 months
Musculoskeletal and connective tissue disorders
Arthralgia
8.3%
6/72 • Number of events 6 • 6 months
2.1%
3/141 • Number of events 3 • 6 months
Musculoskeletal and connective tissue disorders
Pain in extremity
5.6%
4/72 • Number of events 4 • 6 months
2.1%
3/141 • Number of events 3 • 6 months
Respiratory, thoracic and mediastinal disorders
Dyspnoea
5.6%
4/72 • Number of events 4 • 6 months
4.3%
6/141 • Number of events 6 • 6 months
Vascular disorders
Hypertension
6.9%
5/72 • Number of events 5 • 6 months
6.4%
9/141 • Number of events 9 • 6 months
Metabolism and nutrition disorders
Hypokalaemia
5.6%
4/72 • Number of events 4 • 6 months
0.71%
1/141 • Number of events 1 • 6 months

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