A Study of GM-XANTHO in Pressure Ulcer Patients

A Phase IIa Study to Investigate the Efficacy and Safety Profile of GM-XANTHO in Pressure Ulcer Patients

This is a randomized, placebo-controlled, double-blind, 3-arm, single-center, phase IIa, parallel study to assess the efficacy, safety, and tolerability of topically applied 2.5%, 5% GM-XANTHO plus standard of care in patients with stage II or stage III pressure ulcer.

Study Overview

• Status: Not yet recruiting
• Conditions: Diabetes Mellitus; Pressure Ulcer
• Intervention / Treatment: Drug: GM-XANTHO

Detailed Description

This is a randomized, placebo-controlled, double-blind,three-arm, single-centered, parallel study to evaluate the efficacy and safety profiles of the topical ointment, GM-XANTHO. For placebo group and cohort A, at least 30% eligible subjects with DM will be enrolled, for cohort B, only eligible subjects with DM will be enrolled.

Patients with pressure ulcer will be instructed to apply appropriate amount of placebo ( 3.2 mg/cm 2, for placebo group) 2.5 % GM-XANTHO [3.2 mg/cm 2, for cohort A ], or 5% GM-XANTHO [3.2 mg/cm 2, for cohort B] ointment once a day for 28 days. The appropriate dressings that maintain a moist wound as a standard background intervention.

For primary endpoint, the wound completed healing rate of the target lesion will be continuously observed to evaluate the efficacy. For secondary endpoints, the efficacy profile of GM-XANTHO will be assessed by the healing time, recurrent time and recurrent rate. The baseline of each efficacy factors will be evaluated on Day 1 before dosing.

• Study Type: Interventional
• Enrollment (Estimated): 58
• Phase: Phase 2

Contacts and Locations

• Study Contact: Name: Echo Lee, Master; Phone Number: 4218 +886-2-26575399; Email: echo.lee@vcro.com.tw

Study Locations

• Taiwan
  • Taipei
    • Taipei, Taipei, Taiwan, 100225
      • National Taiwan University Hospital

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 20 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• 1. Female or male inpatients including in those staying in a long-term care facility, age ≥ 20 years old.

  2. Patient who is able to understand the nature of this study and accepts to enter the study by signing written informed consent.

  3. Patient is willing to comply with protocol-stated requirements, instructions and restrictions.

  4. Patients who have at least 1 well diagnosed Stage 2 to 3 friction-injury associated PU (according to National Pressure Ulcer Advisory Panel [NPUAP] Staging Guidelines, 2019) as the index ulcer at Screening Visit and First Dosing Visit located in any of the following regions.

  5. Surface dimensions of the index PU should be ≥ 5 cm2 and ≤ 50 cm2 as measured by the greatest length and width method through using an mm-scale ruler.

  6. Patients with adequate arterial blood flow and perfusion near the site of the injury for lower extremity ulcers (e.g., the foot is warm to the touch and has palpable pulses) 7. Patients who agree discontinuation of systemic corticosteroids and systemic immune modulating agents during the study period 8. Patients who agree discontinuation of all local treatment modalities, including but not limited to topical antimicrobials, topical corticosteroid or light treatments during the study period for/on the index wound.

  9. Patients are required to stop using treatment modalities listed in Criteria #7 and #8 at least 14 days (or longer if the treatment half-life requires so; 7 half-life should have elapsed).

  10. Patient has adequate hematopoietic, hepatic function, nutrition condition and renal function as assessed by the following laboratory requirements to be conducted within 28 days prior to the first dosing:

• Hemoglobin ≥ 10 g/dL
• Total WBC ≥ 3,000 cells/μL
• Platelet ≥ 55,000 counts/μL without transfusion support
• Total bilirubin ≤ 1.5× ULN and no sign of jaundice
• ALT and AST ≤ 5× ULN and no clinical significance
• pre-albumin ≥ 11 mg/dL

• Creatinine ≤ 1.5× ULN and no clinical significance 11. If the subject has diabetes mellitus [as per American Diabetes Association guidelines (ADA guideline, 2021)], the hemoglobin A1c (HbA1c) should be≦10 % with a stable anti-diabetes regimen (monotherapy or combination therapy including oral anti-diabetes medications) for more than 12 weeks.

  12. All male patients and female patients with child-bearing potential (between puberty and 2 years after menopause) should use at least any one of the appropriate contraception methods shown below, for during and at least 4 weeks after GM-XANTHO treatment.

  1. Total abstinence [when this is in line with the preferred and usual lifestyle of the subject. Periodic abstinence (e.g., calendar, ovulation, symptothermal, post-ovulation methods) and withdrawal are not acceptable methods of contraception].
  2. Female sterilization (have had surgical bilateral oophorectomy with or without hysterectomy) or tubal ligation at least six weeks before taking study treatment. In case of oophorectomy alone, only when the reproductive status of the woman has been confirmed by follow up hormone level assessment.
  3. Male sterilization. For female subjects on the study, the vasectomized male partner should be the sole partner for that subject.
  4. Combination of any two of the following listed methods: (d.1+d.2 or d.1+d.3, or d.2+d.3):

  d.1 Use of oral, injected or implanted hormonal methods of contraception or other forms of hormonal contraception that have comparable efficacy (failure rate <1%), for example hormone vaginal ring or transdermal hormone contraception.

  d.2 Placement of an intrauterine device (IUD) or intrauterine system (IUS). d.3 Barrier methods of contraception: Condom or Occlusive cap (diaphragm or cervical/vault caps) with spermicidal foam/gel/film/cream/vaginal suppository.

Exclusion Criteria:

• 1. Surgical treatment of pressure ulcers within 30 days prior to the Screening Visit.

  2. Patients who have any concurrent skin condition that will interfere with assessment of treatment or any condition associated with a wound healing abnormality (e.g.: connective tissue disorder or immune disorder).

  3. Patients who have active infection on the PU site(s) at baseline 4. Patients who have known hypersensitivity to the study medication 5. Patients with chronic condition(s) which either is not stable or not well controlled.

  6. Patients having positive results for HBV, HCV or HIV screens 7. Patients who are pregnant or breast feeding 8. Patients carry history of malignancy of any organ system (other than cervical carcinoma in situ or localized prostate cancer) within 5 years prior to study entry.

  9. Patients had participated in investigational drug trials and took any investigational drugs within 30 days or within 5 half-life of the investigational drugs prior to the screening visit.

  10. Patients who are not suitable to participate in the trial as judged by the Investigator(s)

Study Plan

How is the study designed?

Design Details

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

Number of Arms

3

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Placebo Comparator: placebo group; Topical administration of a drug-free placebo ointment daily for 28 days.	Drug: GM-XANTHO; a topical applied ointment; Other Names: Placebo
Active Comparator: cohort A; Topical administration of a 2.5 % GM-XANTHO ointment daily for 28 days.	Drug: GM-XANTHO; a topical applied ointment; Other Names: Placebo
Active Comparator: cohort B; Topical administration of a 5 % GM-XANTHO ointment daily for 28 days.	Drug: GM-XANTHO; a topical applied ointment; Other Names: Placebo

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
percentage change	percentage change in ulcer area	112 days

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Time to complete wound closure	The time from the baseline to the complete healing of the target lesion	112 days
The incidence of complete wound closure of the target lesion.	The percentage of subjects that achieved complete wound closure from baseline at each visit.	112 days
Time to Recurrence	The time from when the target lesion is completely healed to a new ulcer occurred at the same location	112 days
Recurrent rate	The incidence of ulcer recurrence at each visit.	112 days
Changes in wound status	Changes in wound status by Pressure Ulcer Scale for Healing (PUSH) tool	112 days
Change in pain score of the target lesion from baseline	Change in pain score of the target lesion from baseline by using the Visual Analog Scale (VAS)	112 days
The Quality of Life	The Quality of Life by using the Short Form (SF)-36 Health Survey	112 days
Laboratory data changes	Biochemistry, Hematology, Urinalysis	112 days
AE incidences over the study period	AE recording	112 days
Incidence of treatment related AE with ≥ Grade 2	Incidence of subjects experiencing treatment related AE with ≥ Grade 2 according to the predefined toxicity grading scale in this study	112 days
Changes in physical examinations	Changes in physical examinations	112 days
Changes in vital signs	Changes in vital signs	112 days
Changes of ECG examination results	Changes of ECG examination results	112 days

Collaborators and Investigators

• Sponsor: Xantho Biotechnology Co., LTD
• Collaborators: Virginia Contract Research Organization Co., Ltd.
• Investigators: Study Director: Ken Hung, Ph.D., Virginia Contract Research Organization Co., Ltd.

Study record dates

Study Major Dates

• Study Start (Estimated): September 1, 2026
• Primary Completion (Estimated): December 31, 2028
• Study Completion (Estimated): April 30, 2029

Study Registration Dates

• First Submitted: December 27, 2021
• First Submitted That Met QC Criteria: January 14, 2022
• First Posted (Actual): January 20, 2022

Study Record Updates

• Last Update Posted (Estimated): September 3, 2025
• Last Update Submitted That Met QC Criteria: August 26, 2025
• Last Verified: August 1, 2025

More Information

Terms related to this study

• Keywords: Pressure Ulcer
• Additional Relevant MeSH Terms: Endocrine System Diseases; Metabolic Diseases; Glucose Metabolism Disorders; Skin Diseases; Skin Ulcer; Nutritional and Metabolic Diseases; Skin and Connective Tissue Diseases; Diabetes Mellitus; Pressure Ulcer; Substandard Drugs; Pharmaceutical Preparations; Counterfeit Drugs
• Other Study ID Numbers: XANGMXH20210702

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
• product manufactured in and exported from the U.S.: No