NCT07426120 · Psoriasis Research Institute of Guangzhou
Efficacy and Safety of a Botanical Total Coumarin (TC) Cream in Treating Patients With Psoriasis Vulgaris (PLANTCOAT-III)
(PLANTCOAT-III)
What this study is about
The goal of this clinical trial is to learn if a botanical Total Coumarin topical cream (TC Cream) works to treat psoriasis in adults. It will also learn about the safety of the topical TC Cream.
View original scientific description
The goal of this clinical trial is to learn if a botanical Total Coumarin topical cream (TC Cream) works to treat psoriasis in adults. It will also learn about the safety of the topical TC Cream. The main questions it aims to answer are: * Does TC Cream improve the psoriasis disease symptoms? * What medical problems do participants have when applying TC Cream? * Does TC Cream improve the quality of life of psoriasis patients? Researchers will compare TC Cream to a placebo cream (a look-alike cream that contains no active drug) to see if TC Cream works to treat psoriasis.
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Age of 18-70 years old. Both men and women, and members of all races and ethnic groups
- Consistent with the diagnostic criteria of stable phase psoriasis vulgaris, and have at least two target lesions suitable for evaluation
- Women of childbearing age must be using birth control strategies defined by one of the following: 1) a barrier method (condom) and/or 2) oral contraceptives, during the 8-week study period.
- ISGA score ≥ 2 (at least mild severity)
- BSA (stable stage group): 1%≤ to ≤20%
- Signed a written informed consent document
- No additional exposure to the sun
Exclusion criteria
- Subjects in pregnancy, preparing for pregnancy, or breastfeeding
- History of hyperergic or photosensitivity
- History of complicated cardiovascular diseases, cerebrovascular diseases, severe primary diseases of the hepatic, kidney, and hematopoietic system, or patients with psychiatric disorders
- History of photosensitive diseases such as porphyria, chronic actinic dermatitis, Xeroderma pigmentosa
- Within 4 weeks prior to randomization, patients have taken treatment with the following approved or investigational psoriasis therapies on the target lesions:
- Topical treatments
- PUVA, UVB, or Grenz ray therapy.
- Any systemic treatments other than biologicals with a possible effect on psoriasis (e.g., corticosteroids, vitamin D analogues, hydroxycarbamide, azathioprine, methotrexate, cyclosporine, other immunosuppressants).
- Any types of other investigational therapies for psoriasis
- Within 3 months prior to randomizations, patients have taken systemic treatments with retinoids or biological therapies (marketed or otherwise) with a possible effect on psoriasis (e.g., alefacept, efalizumab, etanercept, infliximab).
- Planned initiation of, or changes to, concomitant medications that could affect psoriasis (e.g., beta blockers, anti-malaria drugs, lithium) during the double-blind phase of the study.
- History of allergic reactions attributed to compounds of similar chemical or biologic compositions to Coumarins.
Where
- New York, New York
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Feb 23, 2026 · Source of record for eligibility and locations