Study of TD101, a Small Interfering RNA (siRNA) Designed for Treatment of Pachyonychia Congenita

NCT00716014 | Completed Phase 1 DMC

• 1 other identifier: 24013
• Study Type: interventional
• Target: 1
• Locations: 1 country
• Sites: 1

Brief Summary

Pachyonychia congenita (PC) is a rare, autosomal dominant keratin disorder affecting the nails, skin, oral mucosae, larynx, hair and teeth. Pathogenic mutations in keratin K6a, K6b, K16 or K17 act via a dominant negative mechanism, leading to manifestations of the disease. The most disabling PC symptom is a painful plantar blistering and keratoderma that requires use of ambulation devices in more than 50 percent of patients. Despite our understanding of the molecular basis of PC, current treatment is limited to mechanical removal of the thick calluses, non-specific topical keratolytics, and oral retinoids, none of which alleviates blistering or plantar pain satisfactorily. A public charity, PC Project, has been founded to support the development of treatments for PC (www.pachyonychia.org). In collaboration with this charity, a small company, TransDerm, Inc., has developed a small interfering RNA (siRNA) that specifically targets a mutation in one of the PC keratins, K6a. As this siRNA targets a single nucleotide mutation, it will only be effective against PC subjects harboring this specific mutation. There are currently only six known patients who carry this mutation in the International Pachyonychia Congenita Research Registry, but three of these patients live in Salt Lake City (a mother and two of her children). We propose to perform a Phase Ib clinical trial to test the safety and tolerability of TD101 in PC patients carrying an N171K mutation. We will complete treatment of the adult patient prior to recruitment of the minors.

Conditions

Pachyonychia Congenita

Keywords

Pachyonychia Congenita; siRNA

Outcome Measures

Primary Outcomes (1)

• Determine safety/toxicity of TD101

  18 weeks, followed by 3-month wash out period

Secondary Outcomes (1)

• Determine efficacy of TD101

  18 weeks, followed by 3-month wash out period

Study Arms (2)

Foot 1

ACTIVE COMPARATOR

An active drug injection of TD101 is injected into a callus on the bottom of one foot.

Drug: TD101

Foot 2

PLACEBO COMPARATOR

An injection of placebo (normal saline) is injected into a callus on the bottom of one foot.

Drug: Normal saline (placebo)

Interventions

TD101 DRUG

TD101 is injection into a callus on the bottom of one of the patient's feet

Foot 1

Normal saline (placebo) DRUG

A normal saline solution (placebo) is injected into one of the patient's feet.

Foot 2

Eligibility Criteria

• Age: 10 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Child (0-17), Adult (18-64), Older Adult (65+)

You may qualify if:

• A positive genetic identification of the N171K mutation in the keratin 6a gene from a CLIA certified laboratory;
• Witnessed, signed informed consent approved by Institutional Review Board/Ethics Committee;
• A signed Health Information Portability and Accountability Act (HIPAA) authorization form which permits the use and disclosure of patient's individually identifiable health information for those enrolled in the United States of America;
• Male or female subjects of any race 10 years of age and older;
• Complete physical examination and medical history indicating no abnormalities that will interfere with study objectives;
• Normal or not clinically significant baseline laboratory tests, including hemogram, ANA, serum chemistry panel, urinalysis, C3a, Bb, and APTT,PT;
• Negative pregnancy test (females only).

You may not qualify if:

• Females of childbearing potential not using a highly effective method of birth control (e.g. implants, injectables, combined oral contraceptives, some intrauterine contraceptive devices) during the study;
• Diabetes mellitus requiring treatment other than diet and exercise;
• Treatment of any type for cancer within the last six months;
• History of any significant internal disease;
• Subjects who are known to be allergic to any of the test product(s) or any components in the test product(s) or history of hypersensitivity or allergic reactions to any of the study preparations;
• History of street drug or alcohol abuse;
• Any patient not able to meet the study attendance requirements;
• Subjects who have participated in any other trial of an investigational drug or device within 60 days prior to enrollment or participation in a research study concurrent with this study.

Sponsors & Collaborators

• Pachyonychia Congenita Project: lead

Study Sites (1)

Huntsman Cancer Institute

Salt Lake City, Utah, 84112, United States

Location

MeSH Terms

Conditions

Pachyonychia Congenita

Interventions

Saline Solution

Condition Hierarchy (Ancestors)

Ectodermal Dysplasia; Abnormalities, Multiple; Congenital Abnormalities; Congenital, Hereditary, and Neonatal Diseases and Abnormalities; Skin Abnormalities; Skin Diseases, Genetic; Genetic Diseases, Inborn; Nail Diseases; Skin Diseases; Skin and Connective Tissue Diseases

Intervention Hierarchy (Ancestors)

Crystalloid Solutions; Isotonic Solutions; Solutions; Pharmaceutical Preparations

Study Officials

• Sancy A Leachman, MD, PhD

  PC Project

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: interventional
• Phase: phase 1
• Allocation: RANDOMIZED
• Masking: DOUBLE
• Who Masked: PARTICIPANT, INVESTIGATOR
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: OTHER

Study Record Dates

• First Submitted: July 15, 2008
• First Posted: July 16, 2008
• Study Start: January 1, 2008
• Primary Completion: August 1, 2008
• Study Completion: August 1, 2008
• Last Updated: November 19, 2008

Record last verified: 2008-11

Locations

US (1)