The ASCEND Study: Evaluating TMB-001 in the Treatment of RXLI or ARCI Ichthyosis (ASCEND)

The ASCEND Study: A Phase III, Multicenter, Double Blinded Vehicle Controlled Study of TMB-001 - With a Parallel Optional Maximal Use Arm - in the Treatment of RXLI (X-linked) or ARCI Ichthyosis in Subjects Aged ≥6 Years

This is a randomized, double-blind and vehicle-controlled Phase III study to evaluate the safety and efficacy of topical TMB-001 0.05% ointment for the treatment of congenital ichthyosis (CI) in subjects with either the RXLI or ARCI subtypes.

In addition, a subset of preselected centers will recruit subjects in parallel with either the RXLI or ARCI subtypes for enrollment into an Optional Maximal Use arm for evaluation of the systemic exposure and safety of topical TMB-001 0.05% ointment for the treatment of CI.

The Phase III Study is designed in three periods:

- Period 1 - Induction (3 weeks):

At the beginning of the 3-week Induction Period, eligible subjects will be randomized (2:1 ratio) to either TMB-001 0.05% once-a-day (QD) or Vehicle QD treatment, with use of mandatory standardized bland emollient (Cetaphil™) provided by the Sponsor.

- Period 2 - Treatment (9 weeks):

The dosing frequency in the 9-week treatment period will be increased in each treatment group to TMB-001 0.05% BID or Vehicle BID. Mandatory bland emollient will be discontinued.

- Period 3 - Maintenance (12 weeks):

At Week 12, eligible subjects in the TMB-001 treatment group will be randomized (1:1 ratio) to an open-label treatment with TMB-001 0.05% BID or TMB-001 0.05% QD. To be eligible, subjects must have achieved a ≥1-point reduction in IGA score from Baseline. Subjects with less than a 1-point reduction in IGA score from Baseline will be discontinued from the study.

Vehicle-treated subjects who achieved <1-point reduction in IGA score from Baseline are eligible to cross over to the TMB-001 0.05% BID treatment group. Subjects with a ≥1-point reduction in IGA score from Baseline on vehicle will be discontinued from the study.

Subjects at the end of the study or subjects discontinued from the study at any time will be followed-up for additional 2 weeks for AEs.

Study Overview

• Status: Completed
• Conditions: Ichthyosis
• Intervention / Treatment: Drug: TMB-001; Drug: Matching Vehicle

Detailed Description

This is a multicenter, randomized, double-blind, vehicle-controlled Phase III study to evaluate the efficacy and safety of TMB-001 0.05% topical ointment in the treatment of CI. Subjects will be selected according to predefined entry criteria. The study treatment duration is 24 weeks and expected to be sufficient to show a treatment effect.

Isotretinoin is an approved active pharmacological ingredient with a long history of safe use in humans. However, isotretinoin is a known teratogen with an extremely high risk for severe birth defects if pregnancy occur while taking oral isotretinoin in any amount, even for a short period of time. Therefore oral, systemic isotretinoin requires an iPLEDGE program (iPLEDGE 2012), which is a risk management distribution program mandated by the FDA. To minimize pregnancy risks, women of childbearing potential (WOCBP) will only be enrolled if they agree to use highly effective methods of contraception consistently and correctly and undergo regular pregnancy testing.

To minimize bias, subjects will be blinded and randomly assigned to treatment with TMB-001 0.05% or Vehicle, additionally subjects who had previously been treated with TMB 001 will be excluded from this study but can be enrolled in the optional Maximal Use arm (in a subset of preselected centers). The use of a vehicle control group is consistent with FDA's standard for generating valid scientific evidence to definitively support safety and efficacy. The vehicle group accounts for the effects of treatment that do not depend on the test treatment. The study is designed to mitigate safety risks by using an initial 2:1 randomization (active treatment to vehicle), along with frequent clinic visits over the 12-week treatment period. The subsequent 1:1 randomization of eligible TMB-001 0.05% treated subjects to two dosing regimen (QD or BID) allows for assessment of the optimal TMB-001 0.05% maintenance therapy as well as provides additional safety data for 12 weeks. The cross-over of eligible subjects from the vehicle control group will also provide additional safety data.

Overall, the study design is considered to be scientifically robust and clinically relevant for evaluating TMB-001 0.05% treatment for the safe and effective treatment of CI.

• Study Type: Interventional
• Enrollment (Actual): 153
• Phase: Phase 3

Contacts and Locations

Study Locations

• Canada
  • Alberta
    • Edmonton, Alberta, Canada, T6G 2B7
      • Stollery Children's Hospital
  • British Columbia
    • Surrey, British Columbia, Canada, V3R 6A7
      • Dr. Chih-Ho Hong Medical Inc.
  • Manitoba
    • Winnipeg, Manitoba, Canada, R3M 3Z4
      • Wiseman Dermatology Research Inc.
  • Ontario
    • Toronto, Ontario, Canada, M5G 1X8
      • SickKids Hospital
• France
  • Bron, France, 69677
    • Hôpital Femme Mère Enfant
  • Nantes, France, 44093
    • CHU de Nantes hotel Dieu
  • Paris, France, 75015
    • Hopital Necker APHP
  • Toulouse, France, 31059
    • Hopital Larrey Chu Toulouse
• Germany
  • Berlin, Germany, 10117
    • Charité - Universitätsmedizin Berlin
  • Erlangen, Germany, 91054
    • Universitatsklinikum Erlangen
  • Hamburg, Germany, 22149
    • Katholisches Kinderkrankenhaus Wilhelmstift GmbH
  • Münster, Germany, 48149
    • Münster University Hospital
• Italy
  • Bari, Italy, 70124
    • U.O. di Dermatologia e Venereologia Universitaria
  • Bologna, Italy, 40138
    • U.O. di Dermatologia Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale
  • Florence, Italy, 50125
    • Ambulatorio di Malattie Rare Dermatologiche e Immunopatologia Cutanea
  • Milan, Italy
    • Fondazione IRCCS Ospedale Maggiore Policlinico Milano, Area Materno Infantile - SC pediatria Pneumoinfettivologia
  • Roma, Italy, 00165
    • U.O.C. di Dermatologia Dipartimento Pediatrico Universitario Ospedaliero
• United States
  • Arizona
    • Phoenix, Arizona, United States, 85006
      • U.S. Dermatology Partners
  • California
    • Palo Alto, California, United States, 94304
      • Stanford University School of Medicine
  • Colorado
    • Centennial, Colorado, United States, 80111
      • About Skin Dermatology
  • Connecticut
    • New Haven, Connecticut, United States, 06519
      • Yale Center for Clinical Investigation
  • Florida
    • Miami, Florida, United States, 33136
      • Department of Dermatology and Cutaneous Surgery, University of Miami
  • Illinois
    • Chicago, Illinois, United States, 60611
      • Ann & Robert H. Lurie Children's Hospital of Chicago
  • Indiana
    • Indianapolis, Indiana, United States, 46250
      • Dawes Fretzin Clinical Research Group, LLC
    • Plainfield, Indiana, United States, 46168
      • The Indiana Clinical Trials Center
  • Minnesota
    • New Brighton, Minnesota, United States, 55112
      • Associated Skincare Specialists
  • Mississippi
    • Jackson, Mississippi, United States, 39216
      • University of Mississippi Medical Center (UMMC)
  • North Carolina
    • Winston-Salem, North Carolina, United States, 27104
      • Wake Forest University Health Sciences
  • Ohio
    • Boardman, Ohio, United States, 44512
      • Optima Research
  • Pennsylvania
    • Philadelphia, Pennsylvania, United States, 19104
      • Children's Hospital of Philadelphia (CHOP)
  • South Carolina
    • Charleston, South Carolina, United States, 29425
      • Medical University of South Carolina
  • Texas
    • Houston, Texas, United States, 77056
      • Austin Institute for Clinical Research
    • Pflugerville, Texas, United States, 78660
      • Austin Institute for Clinical Research, Inc.
  • Virginia
    • Norfolk, Virginia, United States, 23502
      • Virginia Clinical Research-Pariser Dermatology Specialists
  • Washington
    • Mill Creek, Washington, United States, 98012
      • North Sound Dermatology

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 6 years and older (Child, Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

1. Subject is male or female, 6 years of age and older at Visit 2 (Baseline).
2. Subject has provided written informed consent/assent. A subject under 18 years of age must provide written informed assent and be accompanied by the parent or legal guardian at the time of consent/assent signing. The parent or legal guardian must provide informed consent for the subject. If a subject becomes 18 years of age during the study, the subject must provide written informed consent at that time to continue study participation.
3. Females must be postmenopausal (defined as amenorrhea greater than 12 consecutive months in women 50 years of age and older), surgically sterile (hysterectomy, bilateral salpingectomy, or bilateral oophorectomy), or use 2 acceptable forms of birth control. WOCBP must have a negative serum pregnancy test at screening and negative urine pregnancy test (UPT) at Visit 2 (Baseline) (UPTs must have a minimum sensitivity to detect 25 mIU beta human chorionic gonadotropin [β hCG]/mL). Female subjects who become sexually active or begin to have relations with a partner during the study must agree to use 2 forms of birth control for 30 days prior to having relations and to continue such forms of birth control for the duration of the study.
4. Subject has clinical diagnosis of CI and has a genetic confirmation of either ARCI (including but not exclusively transglutaminase 1-deficient, ALOX-12B) or RXLI (e.g., deletion of steroid sulfatase gene) subtypes of CI. Other genetically confirmed ARCI-LI mutations can potentially be enrolled as long as the phenotype is consistent with ARCI and the other inclusion criteria are met, as determined by the Investigator.

5. The amount of CI affected skin in the Treatment Area at Baseline will be between a minimum of 10% and maximum of 90% of the total BSA (1% BSA is approximately equal to the surface area of the subject's palm and fingers, with the fingers extended yet grouped together, creating a flat oval-like surface area).

   • For the Optional Maximal Use arm: The amount of CI affected skin in the Treatment Area at Baseline will be between a minimum of 75% and maximum of 90% of the total BSA.

6. Documented history of moderate to severe disease at Screening. Subject's designated VIIS Assessment Areas at Baseline (not applicable for Optional Maximal Use arm):

   • Include any of the 4 VIIS Assessment Areas that have some CI disease involving: (a) the upper back from the posterior axillary fold to the other encompassing the T1-T10, (b) the upper arm (excluding elbows), left or right, (c) the shin/lower leg (the portion below the proximal aspect of the kneecap), left or right, and (d) dorsal foot (left or right); AND
   • At least 2 of the 4 VIIS Assessment Areas MUST have a scaling score of 3 or more.
7. Subject's IGA score in the Treatment Area at Baseline must be 3 or more.
8. Subject and parent/guardian (if applicable) are willing and able to apply the study treatment(s) as directed, comply with study instructions, and commit to all follow-up visits for the duration of the study.
9. Subject, in the Investigator's opinion, is in good general health and free of any disease state or physical condition that might impair evaluation of the Treatment Areas or exposes the subject to an unacceptable risk by study participation.

Exclusion Criteria:

1. Subject is pregnant, lactating, or is planning to become pregnant during the study.
2. Subject has inflammatory skin diseases that confound the interpretation of results (e.g., atopic dermatitis) unrelated to ichthyosis.
3. Subject has genetic abnormality consistent with non-lamellar type or syndromic ichthyoses (including but not exclusively KRT1, KRT10, KRT2, GJB3, GJB4, CDSN)
4. Subject, in the Treatment Areas, has used: (a) any topical prescription or over-the-counter (OTC) therapies (except emollients, keratolytics, and topical steroids - see below), that are intended for, or that in the opinion of the Investigator, may improve CI within 2 weeks of Visit 2 (Baseline), or (b) keratolytics or topical corticosteroids within 5 days prior to Visit 2 (Baseline).
5. Subject, in the Treatment Areas, has used TMB-001 in the past or oral isotretinoin in the past 12 months (not applicable for Optional Maximal Use arm).
6. Subject has used any topical products in the Treatment Areas, including bland emollients, on Visit 2 (Baseline).
7. Subject has used ultraviolet (UV) treatment within 4 weeks prior to Visit 2 (Baseline).
8. Subject has undergone systemic therapies using vitamin A supplements or St. John's Wort within 4 weeks prior to Visit 2 (Baseline). Note: Use of a multivitamin including vitamin A is not exclusionary provided it is taken as directed on the packaging.
9. Subject is immunosuppressed (e.g., human immunodeficiency virus, systemic malignancy, graft host disease) or receives systemic immunotherapy.
10. Subject is currently taking concomitant immunosuppressive drugs, including systemic corticosteroids, within 2 weeks of Visit 2 (Baseline).
11. Subject has untreated secondary infections; however, subject may become eligible after successful treatment of his/her infection(s) at the Investigator's discretion.
12. Subject is currently enrolled in an investigational drug or device study or has used an investigational drug or investigational device treatment within 30 days or five half-lives prior to Visit 2 (Baseline).
13. Subject has lesions suspicious for skin cancer (if skin cancer is not ruled out by biopsy) or untreated skin cancers within the Treatment Areas.
14. Subject has a physical condition or other dermatologic disorder that, in the Investigator's opinion, might impair evaluation of CI, or that exposes the subject to unacceptable risk by study participation.
15. Subjects with ALT or AST >2 x Upper Limit of Normal (ULN) and/or creatinine >1.5 x ULN.
16. Subject is unable to communicate or cooperate with the Investigator due to language problems, impaired cerebral function, or physical limitations.
17. Subject has a history of drug or alcohol abuse within the past 6 months, or if suspected to be noncompliant or is unlikely to comply with the requirements of the study protocol (e.g., due to alcoholism, drug dependency, mental incapacity) in the opinion of the Investigator.
18. Subject has a history of sensitivity to any of the ingredients in the study treatments.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Quadruple

Number of Arms

3

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: TMB-001 0.05%; TMB-001 0.05% ointment: Induction phase QD for 3 weeks, followed by BID for 9 weeks. Maintenance therapy for additional 12 weeks randomized QD vs BID	Drug: TMB-001; Topical TMB-001 0.05% QD/BID
Experimental: Maximal use; Optional Parallel Arm to evaluate the systemic exposure and safety of TMB-001 0.05% under conditions of maximal use.	Drug: TMB-001; Topical TMB-001 0.05% QD/BID
Placebo Comparator: Vehicle; Matching vehicle ointment: Induction phase QD for 3 weeks, followed by BID for 9 weeks. Cross over to 12 weeks TMB-001 0.05% BID.	Drug: Matching Vehicle; Topical Vehicle

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change in Investigator Global Assessment (IGA) Score	Comparison of proportions of subjects in percentages with ≥2-point changes from Baseline in Investigator Global Assessment (IGA)-scaling and fissuring scores in the Treatment Area at Week 12 between TMB-001 0.05% and vehicle-treated subjects. Investigator's Global Assessment Score is a 0-4 scale, where 0 is clear and 4 is severe.	12 weeks

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Number of Subjects With IGA Scores	Comparison of proportion of subjects in percentages with IGA scores of clear or almost clear at Week 12 between TMB-001 0.05% and vehicle-treated subjects. Investigator's Global Assessment Score is a 0-4 scale, where 0 is clear and 4 is severe.	12 weeks
Change in IGA-scaling Severity Sub-score	Comparison of proportion of subjects in percentages who achieve IGA-scaling severity sub-score improvement ≥ 2-points from Baseline to Week 12 between TMB-001 0.05% and vehicle-treated subjects. Investigator's Global Assessment Score is a 0-4 scale, where 0 is clear and 4 is severe.	12 weeks
Change in Worst Itch-Quality of Life (QoL) Scores	Comparison of proportion of subjects in percentages with ≥4-point improvement from baseline in Worst Itch-QoL scores at Week 12 in subjects with baseline WI-NRS of ≥7 between TMB-001 0.05% and vehicle-treated subjects. Itch-Numeric Rating Scale (I-NRS) and Worst Itch-Numeric Rating Scale (WI-NRS) is an 0-10 scale where 0 is "no itching" and 10 is "worst itch imaginable".	12 weeks
Change in Visual Index of Ichthyosis Severity (VIIS) Score	Comparison of proportion of subjects in percentages who achieve 50% reduction from Baseline in VIIS-scaling scores at Week 12 in all areas with Baseline VIIS score ≥3 between TMB-001 0.05% and vehicle-treated subjects. Visual Index for Ichthyosis Severity Score is a 0-4 scale where 0 is clear and 4 is severe.	12 weeks
Change in VIIS Score	Comparison of proportion of subjects in percentages who achieve 25% reduction from Baseline in VIIS-scaling scores at Week 12 in all areas with Baseline VIIS score ≥3 between TMB-001 0.05% and vehicle-treated subjects. Visual Index for Ichthyosis Severity Score is a 0-4 scale where 0 is clear and 4 is severe.	12 weeks
Change in IGA-fissuring Severity Sub-scores	Comparison of proportion of subjects in percentages achieving ≥2 point improvement in IGA-fissuring severity sub-scores from Baseline to Week 12 between TMB-001 0.05% and vehicle-treated subjects. Investigator's Global Assessment Score is a 0-4 scale, where 0 is clear and 4 is severe.	12 weeks
Change in IGA Score	Comparison of proportions of subjects in percentages achieving ≥2-point improvement from Baseline in IGA scores at Week 24 between subjects randomized to TMB-001 0.05% BID and QD maintenance dosing. Investigator's Global Assessment Score is a 0-4 scale, where 0 is clear and 4 is severe.	24 weeks
Change in VIIS Score	Comparison of proportion of subjects in percentages who achieve 50% reduction from Baseline in VIIS-scaling scores at Week 24 in all areas with Baseline VIIS score ≥3 between subjects randomized to TMB-001 0.05% BID and QD maintenance dosing. Visual Index for Ichthyosis Severity Score is a 0-4 scale where 0 is clear and 4 is severe.	24 weeks
Change in Ichthyosis Quality of Life (IQoL)-32 Scores	Comparison of proportions of subjects in percentages with ≥11-point changes from Baseline in IQOL-32 scores at Week 12 between TMB-001 0.05% and vehicle-treated subjects. The IQoL-32 is a questionnaire containing 32, each scored from 0 to 4 ('not applicable', 'not at all', 'a little', 'a lot', 'tremendously') for a total score that varies between 0 and 128. A higher score, the higher impact on quality of life.	12 weeks
Change in Dermatology Life Quality Index (DLQI) Scores	Comparison of proportion of subjects in percentages with reduction from Baseline in DLQI ≥4 points at Week 12 between TMB-001 0.05% and vehicle-treated subjects in adult subjects with Baseline scores ≥11. The age-appropriate questionnaire contains 10 questions scored from 0 (no impact of skin disease on QoL) to 30 (maximum impact on QoL).	12 weeks
Change in Children's Dermatology Life Quality Index (CDLQI) Scores	Comparison of proportion of pediatric subjects in percentages with reduction from Baseline in CDLQI ≥4 points at Week 12 between TMB-001 0.05% and vehicle-treated subjects in pediatric subjects with Baseline scores of ≥13. The age-appropriate questionnaire contains 10 questions scored from 0 (no impact of skin disease on QoL) to 30 (maximum impact on QoL).	12 weeks
Change in Itch-Quality of Life Scores - I-NRS	Comparison of proportions of subjects in percentages with I-NRS improvement ≥4 points from Baseline in Itch-QoL scores (in subjects with Baseline I-NRS ≥7) at Week 24 between subjects randomized to TMB-001 0.05% BID and QD maintenance dosing.	24 weeks
Change in Itch-Quality of Life Scores - WI-NRS	Comparison of proportions of subjects in percentages with WI-NRS improvement ≥4 points from Baseline in Itch-QoL scores (in subjects with Baseline WI-NRS ≥7) at Week 24 between subjects randomized to TMB-001 0.05% BID and QD maintenance dosing.	24 weeks
Change in DLQI Scores	Comparison of proportions of adult subjects in percentages with DLQI changes of ≥4-point from Baseline scores (in subjects with Baseline scores ≥11) at Week 24 randomized to TMB-001 0.05% BID and QD maintenance dosing. The age-appropriate questionnaire contains 10 questions scored from 0 (no impact of skin disease on QoL) to 30 (maximum impact on QoL).	24 weeks
Change in CDLQI Scores	Comparison of proportions of pediatric subjects in percentages with CDLQI changes of ≥4-point from Baseline scores (in subjects with Baseline scores ≥13) at Week 24 randomized to TMB-001 0.05% BID and QD maintenance dosing. The age-appropriate questionnaire contains 10 questions scored from 0 (no impact of skin disease on QoL) to 30 (maximum impact on QoL).	24 weeks
Change in IQoL-32 Scores	Proportions of subjects in percentages with ≥11-point change from Baseline in IQoL-32 at Week 24 between subjects randomized to TMB-001 0.05% BID and QD maintenance dosing in adult subjects. The IQoL-32 is a questionnaire containing 32, each scored from 0 to 4 ('not applicable', 'not at all', 'a little', 'a lot', 'tremendously') for a total score that varies between 0 and 128. A higher score, the higher impact on quality of life.	24 weeks
To Investigate the Proportion of Subjects Experiencing Local Skin Reactions (LSRs) With Topically Applied TMB-001 0.05% Ointment.	Comparison of proportion of subjects in percentages experiencing LSRs through Week 12 between TMB-001 0.05% and vehicle-treated subjects.	12 weeks
To Investigate the Proportion of Subjects Experiencing Treatment-emergent Adverse Events (TEAEs)	Comparison of proportion of subjects in percentages experiencing TEAEs through Week 12 between TMB-001 0.05% and vehicle-treated subjects.	12 weeks
To Investigate the Proportion of Subjects Experiencing LSRs With Topically Applied TMB-001 0.05% Ointment.	Comparison of proportion of subjects in percentages experiencing LSRs through Week 24 between subjects randomized to TMB-001 0.05% BID and QD maintenance dosing.	24 weeks
To Investigate the Proportion of Subjects Experiencing TEAEs	Comparison of proportion of subjects in percentages experiencing TEAEs through Week 24.	24 weeks
To Investigate the Proportion of Subjects Demonstrating Clinically Confirmed Allergic Contact Dermatitis	Comparison of proportion of subjects in percentages demonstrating clinically confirmed allergic contact dermatitis by patch testing through Week 12 between TMB-001 0.05% and vehicle-treated subjects.	Through week 12
Maximal Use Arm: Isotretinoin, Tretinoin, 4-oxo-tretinoin and 4-oxo-isotretinoin - Cmax After Multiple Dosing - Adults	maximal observed plasma concentration. > Assessment of concentrations of isotretinoin, tretinoin, 4-oxo-tretinoin and 4-oxo-isotretinoin.	14 days
Maximal Use Arm: Isotretinoin, Tretinoin, 4-oxo-tretinoin and 4-oxo-isotretinoin - Cmax After Multiple Dosing - Adolescents	maximal observed plasma concentration. > Assessment of concentrations of isotretinoin, tretinoin, 4-oxo-tretinoin and 4-oxo-isotretinoin.	14 days
Maximal Use Arm: Isotretinoin, Tretinoin, 4-oxo-tretinoin and 4-oxo-isotretinoin - AUC0-24 After Multiple Dosing - Adults	AUC0-24 = area under the curve over the first 24 hours post dose. > Assessment of concentrations of isotretinoin, tretinoin, 4-oxo-tretinoin and 4-oxo-isotretinoin.	0-24hrs after dose
Maximal Use Arm: Isotretinoin, Tretinoin, 4-oxo-tretinoin and 4-oxo-isotretinoin - AUC0-24 After Multiple Dosing - Adolescents	AUC0-24 = area under the curve over the first 24 hours post dose. > Assessment of concentrations of isotretinoin, tretinoin, 4-oxo-tretinoin and 4-oxo-isotretinoin.	0-24hrs after dose
Maximal Use Arm: Isotretinoin, Tretinoin, 4-oxo-tretinoin and 4-oxo-isotretinoin - Tmax After Multiple Dosing - Adults	Tmax = time to maximal plasma concentration. > Assessment of concentrations of isotretinoin, tretinoin, 4-oxo-tretinoin and 4-oxo-isotretinoin.	14 days
Maximal Use Arm: Isotretinoin, Tretinoin, 4-oxo-tretinoin and 4-oxo-isotretinoin - Tmax After Multiple Dosing - Adolescents	Tmax = time to maximal plasma concentration. > Assessment of concentrations of isotretinoin, tretinoin, 4-oxo-tretinoin and 4-oxo-isotretinoin.	14 days
Maximal Use Arm: Isotretinoin, Tretinoin, 4-oxo-tretinoin and 4-oxo-isotretinoin - Steady State Concentration After Multiple Dosing - Children	Assessment of concentrations of isotretinoin, tretinoin, 4-oxo-tretinoin and 4-oxo-isotretinoin.	14 days
Maximal Use Arm: Safety and Tolerability - LSRs	Local skin reactions (burnings/stinging, erythema, erosions and edema) are reported as LSRs.	12 weeks
Maximal Use Arm: Safety and Tolerability - TEAEs	Local safety are reported as severe TEAEs related to treatment area.	12 weeks

Collaborators and Investigators

• Sponsor: LEO Pharma
• Collaborators: Timber Pharmaceuticals Inc.

Publications and helpful links

General Publications

• Schneider H, Bunick CG, Hillmann K, Huynh TN, Kempers S, Peschel N, Blume-Peytavi U, Teng JMC, Mendelsohn AM, Stinson J, Lee LW. Maximal use of 0.05% topical isotretinoin in patients with congenital ichthyosis results in low systemic exposure. Br J Clin Pharmacol. 2026 Apr;92(4):1256-1260. doi: 10.1002/bcp.70423. Epub 2025 Dec 17.

Study record dates

Study Major Dates

• Study Start (Actual): June 21, 2022
• Primary Completion (Actual): June 17, 2024
• Study Completion (Actual): September 23, 2024

Study Registration Dates

• First Submitted: March 15, 2022
• First Submitted That Met QC Criteria: March 15, 2022
• First Posted (Actual): March 25, 2022

Study Record Updates

• Last Update Posted (Actual): May 22, 2026
• Last Update Submitted That Met QC Criteria: May 20, 2026
• Last Verified: October 1, 2025

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Infant, Newborn, Diseases; Skin Diseases; Congenital Abnormalities; Skin Abnormalities; Keratosis; Congenital, Hereditary, and Neonatal Diseases and Abnormalities; Skin and Connective Tissue Diseases; Ichthyosis
• Other Study ID Numbers: TMB01-301; 2022-000459-35 (EudraCT Number)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No