Bevacizumab Versus Mitomycin C as Trabeculectomy Adjuvant in Uncontrolled Glaucoma

NCT ID: NCT02901236

Last Updated: 2016-09-15

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: PHASE2/PHASE3
• Total Enrollment: 40 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2014-01-31
• Study Completion Date: 2016-01-31

Brief Summary

Refractory glaucoma often requires vision-sparing trabeculectomy. To increase surgical success, adjunctive pharmacotherapy is utilized albeit the risk of adverse events. This prospective trial randomizes adults with uncontrolled glaucoma to assess an emerging healing modulatory strategy. Over a 1-year follow-up, trabeculectomy complemented with intracameral delivery of anti-angiogenic bevacizumab (1.25 mg) is compared to standard trabeculectomy with anti-fibrotic mitomycin-C (0.02%; applied for 2 minutes).

Detailed Description

This is a prospective, parallel, randomized, comparative, interventional feasibility study. Eyes of Caucasian patients with medically uncontrolled glaucoma or intolerance to glaucoma medications, who are evaluated at the glaucoma service of the Athens Vision Eye Institute and are scheduled for filtration surgery within one calendar year, are enrolled. If both eyes of one patient are eligible one eye is randomly selected. Inclusion criteria include adult patients with primary or secondary open angle or angle closure glaucoma with preoperative intraocular pressure (IOP) > 21 mmHg on maximally tolerated medical therapy at least on 2 occasions prior to randomization with the ability to attend regular follow-up. Exclusion criteria include age (< 18 years), pregnancy, severe ocular surface disease, need for combined phacotrabeculectomy, uveitic or neovascular glaucoma, any prior intraocular surgery except for uncomplicated phacoemulsification and a history of a systemic thromboembolic event within 6 months before surgery. The research adheres to the tenets of the Declaration of Helsinki and is approved by the Human Research Ethics Committee of the Athens Vision Eye Institute. Informed consent will be granted from all patients preoperatively explaining indications and risks of the procedure.

All patients are recruited by the principal investigator and surgeon (GK). The study is unblinded to both patients and investigators. Eyes are randomly assigned to 2 treatment arms by an online random number generator (www.random.org): the "mitomycin C group" that undergoes standard guarded trabeculectomy supplemented with mitomycin C (Kyowa, Galabank Business Park, UK); the "bevacizumab group" that undergoes guarded trabeculectomy with a single 1.25 mg intracameral injection of bevacizumab (Roche, Welwyn Garden City, UK). The online random number generator is accessed for each individual patient by the nursing staff (circulating nurse), which is unaware of study design and patient's characteristics, immediately prior to the surgical procedure. Sample size analysis (www.powerandsamplesize.com) reveals that for a power of 80% assuming a 5% type I error, an average post-op intraocular pressure of 12mmHg and a similar sampling ratio, 13 eyes in each group are necessary to detect a 3mmHg difference in IOP at twelve months (superiority or non-inferiority design). Assuming a dropout rate of 30% at 5 years the investigators aim for 20 eyes in each study group. Furthermore, power analysis reveals that for a power of 80% assuming a 5% type I error, a surgical success rate of 90% at 1 year and a similar sampling ratio, 20 eyes in each group are necessary to detect a 24% difference in rate of surgical success at twelve months (superiority or non-inferiority design).

Before surgery, all patients undergo a comprehensive eye examination including slit lamp biomicroscopy, best corrected visual acuity (BCVA) determination, intraocular pressure measurement using Goldmann applanation tonometry (GAT) at least on 2 separate occasions performed one week apart, gonioscopy and dilated fundus examination. All patients should have at least one visual field test on file, performed not more than 6 months prior to randomization. The Humphrey Visual Field Analyzer (HFA II-i, Carl Zeiss Meditec Inc, Dublin, CA, USA) will be used and the 24/2 SITA-Standard protocol will be utilized in all instances. Preoperative data collected from the medical record of individual patients include age, race, sex, diagnosis, study eye, BCVA, number and type of glaucoma medications, intraocular pressure, global visual field indices, central corneal thickness (CCT), cup to disc ratio, number and type of previous intraocular surgeries and previous glaucoma laser procedures. All pseudophakic eyes should have a history of primary open angle or exfoliation glaucoma, and should have undergone uneventful cataract extraction with a posterior chamber intraocular lens implantation.

Patients are examined on post-operative day one, day three, week one and every week thereafter for the first month, and subsequently on post-operative months 1, 3, 6, 9, and 12. A window of + 1 week is allowed for the 1st and 3rd month post-operative visits, and a window of + 2 weeks is allowed for the 6th, 9th and 12th month post-operative visits. During each visit a comprehensive ophthalmic examination is carried out. This includes intraocular pressure measurement, glaucoma medication requirement update, BCVA, review of early and late complications related to surgery (i.e., blebitis, bleb leak) and additional surgical interventions. These data are recorded in the patients' medical record and are extracted and tabulated in Excel 2013 spreadsheets (Microsoft, Redmond, WA) by an individual who is not participating in patient's management decisions and is blinded with respect to treatment assignment. Subsequently, data are analyzed by a separate individual who reveals study group assignment and calculates means, surgical success rates and complication rates. All patients' data are dealt with confidentiality. Statistical comparisons are performed according to initial treatment group assignment (intention to treat analysis).

Additional post-operative visits and/or interventions at the slit lamp such as 5-fluorouracil (5-FU) injections, bleb needlings and laser suture lyses are at the discretion of the treating ophthalmologist and do not qualify as failures. BCVA is recorded by certified optometrists utilizing clear chart digital screens (Reichert, Depew, NY, USA) placed at 4 m. All patients will undergo 24/2 Swedish Interactive Threshold Algorithm (SITA) Standard Automated Perimetry (SAP) on an annual basis in the post-operative period. SAP will be repeated typically within one month if unreliable.

Conditions

Glaucoma

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: NONE

Study Groups

Mitomycin C

Standard Guarded Trabeculectomy will be performed. In this arm 0.02% of mitomycin C (Kyowa, Japan) will be applied on bare sclera under the conjunctiva for 2 minutes. Subsequently, the area will be copiously irrigated with balanced salt solution.

Group Type: ACTIVE_COMPARATOR

Standard Guarded Trabeculectomy

Intervention Type: PROCEDURE

A fornix based conjunctival peritomy is performed. A partial thickness scleral flap is dissected. Then trabeculectomy is performed with a Kelly's punch. A surgical iridectomy is performed. The scleral flap is secured with two pre-placed 8-0 Vicryl sutures (Ethicon, Somerville, NJ). The anterior chamber (AC) is inflated with balanced salt solution and suture tension is adjusted. Finally, conjunctiva is closed with 10-0 running Nylon sutures (Ethicon, Somerville, NJ). Patients receive a subconjunctival injection of 0.4 ml dexamethasone (4 mg/ml) and of 0.4 ml gentamicin (40 mg/ml) at the end of the case. Adjuvant pharmacologic treatment to prevent episcleral fibrosis and failure of the procedure is applied according to treatment arm assignment.

Mitomycin C

Intervention Type: DRUG

Sponges soaked in 0.02% mitomycin C (MMC) will be applied on bare sclera for 2 minutes. Subsequently, the area will be copiously irrigated with balanced salt solution.

Bevacizumab

Standard Guarded Trabeculectomy will be performed. In this arm at the end of the case and after conjunctival closure 1.25mg of bevacizumab (Avastin; Genentech, San Francisco, CA) will be injected into the the anterior chamber through a paracentesis.

Group Type: ACTIVE_COMPARATOR

Standard Guarded Trabeculectomy

Intervention Type: PROCEDURE

A fornix based conjunctival peritomy is performed. A partial thickness scleral flap is dissected. Then trabeculectomy is performed with a Kelly's punch. A surgical iridectomy is performed. The scleral flap is secured with two pre-placed 8-0 Vicryl sutures (Ethicon, Somerville, NJ). The anterior chamber (AC) is inflated with balanced salt solution and suture tension is adjusted. Finally, conjunctiva is closed with 10-0 running Nylon sutures (Ethicon, Somerville, NJ). Patients receive a subconjunctival injection of 0.4 ml dexamethasone (4 mg/ml) and of 0.4 ml gentamicin (40 mg/ml) at the end of the case. Adjuvant pharmacologic treatment to prevent episcleral fibrosis and failure of the procedure is applied according to treatment arm assignment.

Bevacizumab

Intervention Type: DRUG

After conjunctival closure 1.25mg of bevacizumab will be injected into the anterior chamber through a paracentesis created earlier during the case.

Interventions

Standard Guarded Trabeculectomy

A fornix based conjunctival peritomy is performed. A partial thickness scleral flap is dissected. Then trabeculectomy is performed with a Kelly's punch. A surgical iridectomy is performed. The scleral flap is secured with two pre-placed 8-0 Vicryl sutures (Ethicon, Somerville, NJ). The anterior chamber (AC) is inflated with balanced salt solution and suture tension is adjusted. Finally, conjunctiva is closed with 10-0 running Nylon sutures (Ethicon, Somerville, NJ). Patients receive a subconjunctival injection of 0.4 ml dexamethasone (4 mg/ml) and of 0.4 ml gentamicin (40 mg/ml) at the end of the case. Adjuvant pharmacologic treatment to prevent episcleral fibrosis and failure of the procedure is applied according to treatment arm assignment.

Intervention Type: PROCEDURE

Mitomycin C

Sponges soaked in 0.02% mitomycin C (MMC) will be applied on bare sclera for 2 minutes. Subsequently, the area will be copiously irrigated with balanced salt solution.

Intervention Type: DRUG

Bevacizumab

After conjunctival closure 1.25mg of bevacizumab will be injected into the anterior chamber through a paracentesis created earlier during the case.

Intervention Type: DRUG

Other Intervention Names

trabeculectomy; glaucoma filtration surgery; trabeculectomy with antimetabolites; trabeculectomy with antifibrotic agents; MMC; Avastin

Eligibility Criteria

Inclusion Criteria

• adult patients
• primary or secondary open angle or angle closure glaucoma
• preoperative intraocular pressure > 21 mmHg on maximally tolerated medical therapy at least on 2 occasions prior to randomization
• ability to attend regular follow-up

Exclusion Criteria

• age (< 18 years)
• pregnancy
• severe ocular surface disease
• need for combined phacotrabeculectomy
• uveitic or neovascular glaucoma
• any prior intraocular surgery except for uncomplicated phacoemulsification
• a history of a systemic thromboembolic event within 6 months before surgery

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

Sponsors

Athens Vision Eye Institute

OTHER

Sponsor Role: lead

Responsible Party

Theodoros Filippopoulos

Director of the Glaucoma Service

Responsibility Role: PRINCIPAL_INVESTIGATOR

Principal Investigators

Gerassimos Kopsinis, M.D., Ph.D.

Role: PRINCIPAL_INVESTIGATOR

Athens Vision Eye Institute

Other Identifiers

Gl001

Identifier Type: -

Identifier Source: org_study_id