E.1 Medical condition or disease under investigation |
E.1.1 | Medical condition(s) being investigated |
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E.1.1.1 | Medical condition in easily understood language |
Longstanding kidney disease |
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E.1.1.2 | Therapeutic area | Not possible to specify |
MedDRA Classification |
E.1.2 Medical condition or disease under investigation |
E.1.2 | Version | 20.0 |
E.1.2 | Level | PT |
E.1.2 | Classification code | 10064848 |
E.1.2 | Term | Chronic kidney disease |
E.1.2 | System Organ Class | 10038359 - Renal and urinary disorders |
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E.1.3 | Condition being studied is a rare disease | No |
E.2 Objective of the trial |
E.2.1 | Main objective of the trial |
To evaluate the effect of TRC101 on the progression of chronic kidney disease and to evaluate the safety profile of TRC101 in CKD patients with metabolic acidosis. |
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E.2.2 | Secondary objectives of the trial |
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E.2.3 | Trial contains a sub-study | Yes |
E.2.3.1 | Full title, date and version of each sub-study and their related objectives |
DXA sub-study Dual energy x-ray absorptiometery (DXA) scans will be performed in a subset of subjects (approximately 200 to 400) to evaluate bone mineral density and trabecular bone score. These subjects will be enrolled from a subset of sites who have qualified DXA facilities if they consent to undergo the scans. |
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E.3 | Principal inclusion criteria |
1. Have provided written informed consent prior to participation in the study. 2. Male or female subjects 18 to 85 years of age, inclusive, at Screening 1 Visit. 3. The mean of two Screening eGFR measurements, drawn at least 2 weeks apart and both within 6 weeks of the first day of Part A, is 20 to 40 mL/min/1.73m2, inclusive, calculated using the CKD-EPI equation as reported by the central laboratory. • Note: If more than two eGFR values were measured at the central laboratory during the Screening Period, the Screening eGFR will be based on the most recent two values that are at least 2 weeks apart and within 6 weeks of the first day of Part A. Enrollment of patients with Screening eGFR in the range 15 to 20 mL/min/1.73m2 may be allowed in the future with notification to the sites by Tricida and will not require a protocol amendment. Subjects with a Screening eGFR value in the range of 15 to <20 mL/min/1.73m2 may not be enrolled until Tricida has authorized this change in writing. 4. Have stable renal function as defined by eGFR Screening values that are not different by > 20% (the higher of the two Screening eGFR values will be used as the denominator to calculate the 20% allowable difference). • Note: If more than two eGFR values were measured at the central laboratory during the Screening Period, the first and last values must be used for calculation of the allowable eGFR difference. 5. Based on onsite measurement using an i STAT point of care device, have three serum bicarbonate values, each ≥ 2 weeks apart from each other and all within 6 weeks of the A1 Visit, in the range from 12 to 20 mEq/L, inclusive. One of these three values must be from the A1 Visit, pre-dose. One same-day retest using the i-STAT point of care device is allowed from Screening 1 Visit through the A1 Visit. Subjects with Baseline Bicarbonate (defined as the average of the serum bicarbonate values at Screening 1, Screening 2 and the A1 Visit [predose]) values of 12 to 18 mEq/L are eligible without restriction. Once approximately half of study subjects have been randomized with Baseline Bicarbonate > 18 to 20 mEq/L, randomization may be closed to additional subjects with Baseline Bicarbonate in this range. 6. Mean systolic and diastolic blood pressure (determined as the average of three replicates) must be < 160/92 mmHg at the Screening 2 Visit. 7. Receiving treatment with an ACE inhibitor and/or ARB at the maximum tolerated (for the individual subject) dose within the country-specific labeled dose range, without adjustments, for ≥ 4 weeks prior to the Screening 1 Visit and during the Screening Period. The maximum tolerated dose for an individual subject may be less than the maximum labeled dose or may be zero if the medical reason is documented. Subjects not treated with an ACE inhibitor or ARB must be approved by the Medical Monitor following a review of the medical justification. Non-diabetic subjects with urine ACR < 30 mg/g (< 3.39 mg/mmol) are not required to be receiving treatment with an ACE inhibitor and/or ARB. 8. If receiving an oral alkali supplement, the dose must be stable for ≥ 2 weeks prior to Screening 1 Visit and during the Screening Period. If not receiving alkali treatment, there must be no such treatment within the 2 weeks prior to Screening 1 Visit or during the Screening Period. 9. Have a hemoglobin A1c (HbA1c) value of ≤ 11.0% (0.11 fraction; 97 mmol/mol) at the Screening 1 Visit (based on central laboratory measurement). 10. Have adequate peripheral venous access for blood draws. 11. Women who are of childbearing potential must have negative pregnancy tests at the Screening 1 and Part B Day 1 Visits and be willing to use an acceptable method of birth control from the Screening 1 Visit until 1 week after study drug completion. Acceptable methods include hormonal contraception (oral contraceptives, patch, implant, and injection), intrauterine devices, double barrier methods (e.g., vaginal diaphragm, vaginal sponge, condom, spermicidal jelly), sexual abstinence or a vasectomized partner. Women who are surgically sterile with documentation of such, or who are at least 1-year post-last menstrual period and > 55 years of age, are considered not to be of childbearing potential.
Inclusion Criterion for Randomization: 1. Have an increase from Baseline Bicarbonate of ≥ 4 mEq/L or have a serum bicarbonate value that is ≥ 22 mEq/L based on an i-STAT point of care measurement during Part A.
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E.4 | Principal exclusion criteria |
1. Have any level of low serum bicarbonate at either Screening Visit that, in the opinion of the Investigator, requires emergency intervention or evaluation for an acute acidotic process. 2. Have had anuria, dialysis, or acute kidney injury/acute renal failure in the 3 months prior to the Screening 1 Visit. 3. Have chronic obstructive pulmonary disease (COPD) that is treated with chronic oral steroids, that requires the subject to be on oxygen, or that required hospitalization within the previous 6 months. 4. Had heart failure with maximum New York Heart Association (NYHA) Class IV symptoms during the 3 months prior to the Screening 1 Visit. 5. Had a heart, liver or kidney transplant. Note: Subjects on the cadaveric transplant list or being evaluated for a future living donor transplant may be enrolled. 6. Have planned initiation of renal replacement (RRT) therapy (dialysis or transplantation) within 6 months following randomization. 7. Have had a stroke or transient ischemic attack within the 6 months prior to Screening 1 Visit. 8. Have had a cardiac event within 3 months prior to Screening 1 Visit, including: myocardial infarction, acute coronary syndrome, coronary bypass grafting, percutaneous coronary intervention, valve procedure, inpatient or outpatient treatment for acute decompensated heart failure. 9. Have been hospitalized for any reason during the 2 months prior to the Screening 1 Visit, other than for pre-planned diagnostic or minor invasive procedures (e.g., placement of dialysis access). Note 1: Subjects who had major cardiovascular procedures or percutaneous cardiac interventional or therapeutic procedures during this time frame are excluded, even if the procedures were pre-planned. Note 2: Subjects hospitalized during this time frame for <48 hours or for self-limited conditions (e.g., hypoglycemia, hyperkalemia, nausea) may be enrolled with approval of the Medical Monitor. 10. Have an ileostomy or colostomy or have had a bowel resection or bariatric surgery. Subjects who have had gastric lap band procedures (no gastric resection) are allowed. 11. Have liver enzyme (alanine aminotransferase [ALT], aspartate aminotransferase [AST]) or total bilirubin values > 3× the upper limit of normal (ULN) at the Screening 2 Visit based on central laboratory measurements. 12. Have a corrected serum calcium < 8.0 mg/dL (80 mg/L; 2 mmol/L) at the Screening 1 Visit, based on central laboratory measurement. 13. Have active cancer during the 1 year prior to the Screening 1 Visit or cancer that is currently being treated or will be treated during the study, other than non-melanoma skin cancer or low-grade cervical carcinoma. Subjects with cancers that are being treated with hormonal therapy only may be permitted with approval of the Medical Monitor. 14. Have received any investigational drug during the last month (28 days or ≥ 5 half-lives [if known], whichever is longer) preceding the Screening 1 Visit or during Screening Period. 15. Have a known allergy to placebo (microcrystalline cellulose). 16. Have an inability to consume the study drug or otherwise comply with the protocol. 17. Has received cytotoxic therapy, immunosuppressive therapy, or other immunotherapy for renal disease within 6 months prior to the Screening 1 Visit or during the Screening Period. Note: Glucocorticoid use is allowed. 18. Have a history of alcoholism or drug/chemical abuse, as defined by The Diagnostic and Statistical Manual of Mental Disorders (DSM-5), within 6 months prior to the Screening 1 Visit. 19. Have, in the opinion of the Investigator, any medical condition, uncontrolled systemic disease or serious concurrent illness that would significantly decrease study compliance or jeopardize the safety of the subject or affect the interpretability of the subject’s data. 20. Participated (i.e., was randomized) in Study TRCA-301. 21. Are pregnant or currently breastfeeding.
Exclusion Criteria for Randomization: 1. Have a confirmed eGFR decline of ≥ 40% from baseline. 2. Have received dialysis or a kidney transplant during Part A. 3. Are pregnant or currently breastfeeding. 4. Have, in the opinion of the Investigator, significant non-compliance with study requirements during Part A or any medical condition, uncontrolled systemic disease or serious concurrent illness that would significantly decrease study compliance or jeopardize the safety of the subject or affect the interpretability of the subject’s data.
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E.5 End points |
E.5.1 | Primary end point(s) |
Progression of chronic kidney disease, defined by time to first occurrence of any event in the composite endpoint consisting of the following as adjudicated by the independent blinded Clinical Endpoint Adjudication Committee (CEAC): • A confirmed ≥ 40% reduction in eGFR • End-stage renal disease (ESRD) • Renal death |
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E.5.1.1 | Timepoint(s) of evaluation of this end point |
The time to first occurrence of any component of the composite endpoint as adjudicated by an independent blinded CEAC. |
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E.5.2 | Secondary end point(s) |
1. Time to ESRD 2. eGFR slope 3. Change from baseline in the total score of the KDQOL Physical Functioning Survey at the end of treatment or last measurement prior to initiation of renal replacement therapy (RRT), whichever occurs first 4. Time to first occurrence of the primary composite endpoint or cardiovascular (CV) death 5. Frequency of all-cause hospitalization |
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E.5.2.1 | Timepoint(s) of evaluation of this end point |
1. Time to occurrence of ESRD 2. At end of treatment 3. At end of treatment or last measurement prior to initiation of RRT, whichever occurs first 4. Time to first occurrence of primary composite endpoint or CV death 5. At end of treatment |
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E.6 and E.7 Scope of the trial |
E.6 | Scope of the trial |
E.6.1 | Diagnosis | No |
E.6.2 | Prophylaxis | No |
E.6.3 | Therapy | No |
E.6.4 | Safety | Yes |
E.6.5 | Efficacy | Yes |
E.6.6 | Pharmacokinetic | No |
E.6.7 | Pharmacodynamic | No |
E.6.8 | Bioequivalence | No |
E.6.9 | Dose response | No |
E.6.10 | Pharmacogenetic | No |
E.6.11 | Pharmacogenomic | No |
E.6.12 | Pharmacoeconomic | No |
E.6.13 | Others | No |
E.7 | Trial type and phase |
E.7.1 | Human pharmacology (Phase I) | No |
E.7.1.1 | First administration to humans | No |
E.7.1.2 | Bioequivalence study | No |
E.7.1.3 | Other | No |
E.7.1.3.1 | Other trial type description | |
E.7.2 | Therapeutic exploratory (Phase II) | No |
E.7.3 | Therapeutic confirmatory (Phase III) | Yes |
E.7.4 | Therapeutic use (Phase IV) | No |
E.8 Design of the trial |
E.8.1 | Controlled | Yes |
E.8.1.1 | Randomised | Yes |
E.8.1.2 | Open | No |
E.8.1.3 | Single blind | No |
E.8.1.4 | Double blind | Yes |
E.8.1.5 | Parallel group | Yes |
E.8.1.6 | Cross over | No |
E.8.1.7 | Other | Yes |
E.8.1.7.1 | Other trial design description |
This study includes a single-blind period of 4-8 weeks and a double-blind period of approx 3.5 years |
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E.8.2 | Comparator of controlled trial |
E.8.2.1 | Other medicinal product(s) | No |
E.8.2.2 | Placebo | Yes |
E.8.2.3 | Other | No |
E.8.2.4 | Number of treatment arms in the trial | 2 |
E.8.3 |
The trial involves single site in the Member State concerned
| No |
E.8.4 | The trial involves multiple sites in the Member State concerned | Yes |
E.8.4.1 | Number of sites anticipated in Member State concerned | 10 |
E.8.5 | The trial involves multiple Member States | Yes |
E.8.5.1 | Number of sites anticipated in the EEA | 158 |
E.8.6 Trial involving sites outside the EEA |
E.8.6.1 | Trial being conducted both within and outside the EEA | Yes |
E.8.6.2 | Trial being conducted completely outside of the EEA | No |
E.8.6.3 | If E.8.6.1 or E.8.6.2 are Yes, specify the regions in which trial sites are planned |
Albania |
Argentina |
Australia |
Belgium |
Brazil |
Bulgaria |
Canada |
Chile |
Colombia |
Czech Republic |
France |
Georgia |
Germany |
Hong Kong |
Hungary |
Israel |
Italy |
Korea, Republic of |
Macedonia, the former Yugoslav Republic of |
Malaysia |
Mexico |
Netherlands |
New Zealand |
Poland |
Portugal |
Romania |
Serbia |
Singapore |
Slovakia |
Spain |
Taiwan |
Ukraine |
United Kingdom |
United States |
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E.8.7 | Trial has a data monitoring committee | Yes |
E.8.8 |
Definition of the end of the trial and justification where it is not the last
visit of the last subject undergoing the trial
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The point in time when all subjects who are required to complete and likely to complete the 2-Week Post-Treatment Visit have done so. |
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E.8.9 Initial estimate of the duration of the trial |
E.8.9.1 | In the Member State concerned years | 4 |
E.8.9.1 | In the Member State concerned months | 6 |
E.8.9.1 | In the Member State concerned days | 0 |
E.8.9.2 | In all countries concerned by the trial years | 4 |
E.8.9.2 | In all countries concerned by the trial months | 6 |
E.8.9.2 | In all countries concerned by the trial days | 0 |