An Innovative Chinese Herbal Formula for Macular Edema

NCT ID: NCT05122702

Last Updated: 2022-11-15

Basic Information

• Recruitment Status: UNKNOWN
• Clinical Phase: PHASE2
• Total Enrollment: 70 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2022-07-12
• Study Completion Date: 2025-01-01

Brief Summary

Macular edema (ME) is caused by hyperpermeability of retinal vessels and/or decreased efflux of fluid across the retinal pigment epithelium induced by outer/inner blood-retinal barrier dysfunction (BRB). It is most commonly seen following many diseases such as diabetes mellitus (DM), intraocular surgery, uveitis, retinal vein occlusion, and posterior segment inflammatory disease. An estimated 11% of patients with DM develop diabetic macular edema (DME). While the overall prevalence of DME among patients with DM aged 20 to 79 years is approximately 7.5%, the risk increases over time. Currently, there is no cure for ME.

Chinese medicine (CM) is widely used to manage ME in China and other East Asian countries. Among them, Shenling Baizhu San (SBS) is one of the most commonly used formulae. In this proposal, a randomized, double-blind, placebo-controlled, multicenter clinical trial will be undertaken to evaluate the efficacy and safety of modified SBS (mSBS) developed by the project team for the treatment of ME.

Eligible subjects will be recruited and assigned randomly to receive orally mSBS or placebo twice a day for 12 consecutive weeks, with follow-up for another 4 weeks after stopping the treatment to observe the duration of efficacy.

Detailed Description

Macular edema (ME) is characterized by hyperpermeability of retinal vessels and/or decreased efflux of fluid across the retinal pigment epithelium, and the condition can be induced by outer/inner blood-retinal barrier dysfunction (BRB). It is most commonly seen following a number of local and systemic diseases and procedures such as diabetes, intraocular surgery, uveitis, retinal vein occlusion, posterior segment inflammatory disease, and cataract surgery. Pathologically, ME is characterized by a retinal thickening in the macular area due to the breakdown of the BRB. ME patients often suffer from blurred vision, dark spots, and deformation, which can seriously affect their central vision, and in severe case, can lead to blindness.

Nowadays, ME treatment options include intravitreal anti-vascular endothelial growth factor (VEGF) agents, intravitreal long-acting steroid, non-steroidal anti-inflammatory drugs, corticosteroids, carbonic anhydrase inhibitors, and subthreshold macular laser. Although the above treatment options have made great progress, the possible side effects of the potentially toxic pharmaceutical agents should be always alert by clinician. A stepwise therapeutic approach is a challenge for the management of ME arises in the chronic and persistent case. Additionally, surgical management should be considered for unremitting cases of ME. Side effects such as scotomas, corresponding to the laser burns, have been frequently noticed by the patients following photocoagulation.

Currently, there is no cure for ME in conventional medicine. Chinese medicine (CM) is becoming popular for managing ME in China and other East Asian countries. Several research groups worldwide have previously conducted clinical studies to evaluate the effectiveness of Chinese herbal medicines for the treatment of ME in recent decades. This study is of an innovative Chinese herbal formula modified from a famous ancient formula for the treatment of macular edema. The goal of this treatment modality is to reduce the accumulation of intraretinal fluid, thus leading to improved visual acuity. Among different Chinese herbal formulae for ME, Shenling Baizhu San (SBS), which was originally described "Formulas from the Imperial Pharmacy" (Taiping Huiming Hejiju Fang in Chinese), has been reported have good efficacy in the treatment.

This study will use an innovative Chinese herbal formula modified from a famous ancient formula for the treatment of ME. This clinical study will be able to provide robust clinical evidence on the efficacy and safety of mSBS for ME. Subjects will be recruited and assigned to receive orally mSBS or placebo twice a day for 12 weeks, with follow-up for another 4 weeks after stopping the treatment to observe the duration of efficacy.

Conditions

Macula Edema

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: QUADRUPLE

Study Groups

Active Arm

18.75g of "Modified Shenling Baizhu San" granules will be taken twice daily for 12 weeks.

Group Type: EXPERIMENTAL

modified Shenling Baizhu San

Intervention Type: DRUG

modified Shenling Baizhu San granules, twice daily for 12 weeks.

Placebo Arm

18.75g of placebo granules will be taken twice daily for 12 weeks.

Group Type: PLACEBO_COMPARATOR

Placebo

Intervention Type: OTHER

Placebo granules, twice daily for 12 weeks.

Interventions

modified Shenling Baizhu San

modified Shenling Baizhu San granules, twice daily for 12 weeks.

Intervention Type: DRUG

Placebo

Placebo granules, twice daily for 12 weeks.

Intervention Type: OTHER

Other Intervention Names

Placebo granules

Eligibility Criteria

Inclusion Criteria

• Both gender;
• Age from 18 to 80 years;
• Known diagnosed with ME;
• Agree to under optical examination and willing to complete questionnaires and take medications as scheduled; and
• Agree to participate in the study and provide written informed consent. (for those illiterate subjects, their family member can sign the consent form upon subject's agreement)

Exclusion Criteria

• Known ocular media opacities, such as cataract, vitreous hemorrhage, asteroid hyalosis, that affect the determination of retinal thickness from OCT imaging;
• Known clinically significant macular edema (CSME). The definition of CSME: if one or more of the following criteria are met 1) retinal thickening at or within 500 μm of the center of the macula; 2) hard exudates at or within 500 μm of the center of the macula, if associated with adjacent retinal thickening; 3) a zone or zones of retinal thickening one disc area in size, at least part of which is within one disc diameter of the center of the macula;
• On concomitant oral or injectable corticosteroids, topical non-steroidal anti-inflammatory drugs (NSAID) eye drops, leukotriene inhibitors, anti-VEGF, immunosuppressants for the treatment of ME within past 6 months or other Chinese herbal medicine for the treatment of ME within past month;
• Impaired hematological profile and liver / renal function exceeds the upper limit of the reference value by 2 times;
• Documented pregnant or lactating; or
• Subjects participating in other clinical studies at the same time.

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 80 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Chinese University of Hong Kong

OTHER

Sponsor Role: lead

Responsible Party

Prof. Lin Zhixiu

Professor

Responsibility Role: PRINCIPAL_INVESTIGATOR

Principal Investigators

Zhixiu Lin, PhD

Role: PRINCIPAL_INVESTIGATOR

Hong Kong Institute of Integrative Medicine

Locations

The Chinese University of Hong Kong

Shatin, , Hong Kong

Site Status: RECRUITING

Countries

Hong Kong

Central Contacts

Tiahe Song, PhD

Role: CONTACT

thsong@cuhk.edu.hk

28733252

Cho Wing Lo

Role: CONTACT

louislo@cuhk.edu.hk

35053476

Facility Contacts

Zhi-xiu Lin, PhD

Role: primary

linzx@cuhk.edu.hk

Other Identifiers

Macular Edema study

Identifier Type: -

Identifier Source: org_study_id