Extension Study in Primary Distal Renal Tubular Acidosis

NCT03831152 | Withdrawn Phase 3 FDA Drug

• 1 other identifier: B24CS
• Study Type: interventional
• Target: N/A
• Locations: 1 country
• Sites: 1

Brief Summary

Open-label study involving longitudinal assessment of the continued safety, tolerability, and efficacy of ADV7103 in maintaining targeted serum bicarbonate levels, preventing metabolic acidosis, and preventing hypokalemia in the following groups of subjects with primary dRTA:

1. 1.subjects who participated in Study B23CS and were adherent to the protocol;
2. 2.subjects ≥ 6 months of age who are living in Europe and did not participate in Study B23CS; and
3. 3.infants younger than 6 months of age

Conditions

Acidosis, Renal Tubular

Outcome Measures

Primary Outcomes (1)

• The Safety of ADV7103 will be assessed by evaluating the frequency of Treatment-Emergent Adverse events as compared to placebo

  Number/proportion of subjects presenting with ADV7103 treatment-related adverse events (AEs) during the study, by severity grade.

  To 30 months

Study Arms (1)

Experimental ADV7103

EXPERIMENTAL

All patients receive ADV7103 at their individualized dose

Drug: ADV7103

Interventions

ADV7103 DRUG

Single group assignment

Experimental ADV7103

Eligibility Criteria

• Age: 4 Months - 65 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Child (0-17), Adult (18-64), Older Adult (65+)

You may qualify if:

• Subjects who participated in Study B23CS must meet all of the following criteria to be registered into this study:
• \. Female or male subjects who participated in Study B23CS and were adherent to the protocol;
• Subjects who did not participate in Study B23CS must meet all of the following criteria to be registered into this study:
• Female or male subjects ≤ 65 years of age at time of consent with the following stipulations:
• Subjects ≥ 6 months of age must reside in Europe
• Subjects \< 6 months of age must reside in the United States, Canada, or Europe;
• Subjects \< 6 months of age must be able to swallow (not suck) solid food without difficulty;
• Subject presents with a previous diagnosis of primary dRTA;
• Subject ≥ 6 months of age requires ≥ 0.9 mEq/kg/day of alkali therapy to maintain serum bicarbonate levels above the LLN;
• Urine pH \> 5.5 and serum bicarbonate \> 18 mEq/L for subjects ≥ 4 years old or \> 17 mEq/L for subjects \< 4 years old on alkali therapy and potassium supplementation (if indicated) on at least one occasion for each within 6 months;
• European subjects must be included in a social health insurance system and/or in compliance with the recommendations of the national law in force relating to biomedical research;
• Subject or parent/guardian is willing and able to understand and sign informed consent and willing to comply with protocol instructions; child assent when appropriate; and

You may not qualify if:

• Subjects who participated in Study B23CS and meet any of the following criteria will be considered ineligible for registration into this study:
• Female subject who is pregnant or lactating or has plans for pregnancy during the study; or
• Subject requires therapy with potassium sparing diuretics, angiotensin converting enzyme inhibitors, angiotensin II receptor blockers, trimethoprim, drospirenone and other progestins, nephrotoxic antibiotics, penicillins, tacrolimus, or medications known to delay gastric emptying or otherwise interfere with absorption of study product.
• Subjects who did not participate in Study B23CS and meet any of the following criteria will be considered ineligible for registration into this study:
• Female subject who is pregnant or lactating or has plans for pregnancy during the study;
• Subject has evidence of proximal tubule dysfunction unless the subject is \< 6 months of age;
• Subject presents with another diagnosed condition as a potential etiology for her/his dRTA ;
• Subject requires therapy with potassium sparing diuretics, angiotensin converting enzyme inhibitors, angiotensin II receptor blockers, trimethoprim, drospirenone and other progestins, nephrotoxic antibiotics, penicillins, tacrolimus, or medications known to delay gastric emptying or otherwise interfere with absorption of study product;
• Subject has evidence of obstructive uropathy or other findings on renal ultrasound expected to require intervention during the course of the study;
• Subject has any of the following laboratory abnormalities:
• AST and/or ALT \> 1.5x upper limit of normal (ULN)
• Serum potassium \> 5.0 mEq/L or hypokalemia accompanied by clinical symptoms (eg, muscle cramps) or significant ECG changes (eg, T wave depression, U wave elevation)
• Estimated glomerular filtration rate (eGFR) \< 60 mL/min/1.73 m2 (according to the updated Schwartz formula for children and Chronic Kidney Disease - Epidemiology Collaboration \[CKD-EPI\] formula for adults)
• Total bilirubin \> ULN, except with known Gilbert's disease.
• Subject has been hospitalized or had outpatient surgery (other than minor skin and dRTA disease-related procedures or ear tube placement) in the past 6 months or is planning surgery in the next 6 months.

Sponsors & Collaborators

• Advicenne Pharma: lead

Study Sites (1)

University of South Florida Pediatric Infectious Diseases

Tampa, Florida, 33606, United States

Location

MeSH Terms

Conditions

Acidosis, Renal Tubular

Condition Hierarchy (Ancestors)

Renal Tubular Transport, Inborn Errors; Kidney Diseases; Urologic Diseases; Female Urogenital Diseases; Female Urogenital Diseases and Pregnancy Complications; Urogenital Diseases; Male Urogenital Diseases; Genetic Diseases, Inborn; Congenital, Hereditary, and Neonatal Diseases and Abnormalities; Acidosis; Acid-Base Imbalance; Metabolic Diseases; Nutritional and Metabolic Diseases

Study Officials

• Andre Ulmann, M.D., Ph.D.

  Advicenne Pharma

  STUDY CHAIR

Study Design

• Study Type: interventional
• Phase: phase 3
• Allocation: NA
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: SINGLE GROUP
• Sponsor Type: INDUSTRY
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: January 23, 2019
• First Posted: February 5, 2019
• Study Start: December 20, 2023
• Primary Completion: January 1, 2025
• Study Completion: March 1, 2025
• Last Updated: February 9, 2026

Record last verified: 2026-02

Data Sharing

• IPD Sharing: Will not share

Locations

US (1)