Open Label Extension of a Clinical Trial of Intravitreal Triamcinolone for Diabetic Macular Oedema-TDMX Study

Diabetic Macular Oedema Clinical Trial

Official title:

An Open Label Extension of the Phase II/III Clinical Trial of Intravitreal Triamcinolone on the Effects and Safety of Clinically Significant Diabetic Macular Oedema That Persists After Laser Treatment

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT00148330
• Other study ID #: NHMRC project 402573
• Status: Completed
• Phase: Phase 2/Phase 3
• First received: September 6, 2005
• Last updated: June 29, 2010
• Start date: May 2005
• Est. completion date: July 2008

Study information

• Verified date: May 2005
• Source: University of Sydney
• Contact: n/a
• Is FDA regulated: No
• Health authority: Australia: Department of Health and Ageing Therapeutic Goods Administration
• Study type: Interventional

Clinical Trial Summary

This open label extension will treat all the eyes of study participants with active study medication (intravitreal triamcinolone) as well as standard laser treatment where appropriate.

The specific aims will be to test the following hypotheses:

• That intravitreal triamcinolone for diabetic macular oedema that persists or recurs after laser treatment remains efficacious over five years

• That intravitreal triamcinolone for diabetic macular oedema that persists or recurs after laser treatment retains a manageable and acceptable safety profile over five years

Description:

A 25 fold increase in the risk of going blind on diagnosis of diabetes is one of the most daunting threats that patients face. People using insulin are particularly challenged because they are unable accurately to draw up their dose of drug. Most cases of vision impairment in diabetes are due to macular oedema that persists or recurs after laser treatment. There are now a number of uncontrolled, anecdotal reports that intravitreal triamcinolone (IVTA) is highly effective for the treatment of diabetic macular edema which is refractory to conventional laser treatment. We commenced the first placebo-controlled, double masked clinical trial of IVTA for refractory macular oedema in 2002. The 3 month results from this study provide the first scientific proof of principle that IVTA reduces macular thickness and improves vision. The two year results will be available in March 2005, but confidential interim analysis of efficacy data in September 2004 suggested that the beneficial effect of triamcinolone treatment persisted. Thus it appears that treatment with IVTA may be the most significant development for the prevention of blindness in people with diabetes since the introduction of laser treatment. It would also be a highly cost-effective intervention that could be administered by general ophthalmologists. The treatment cannot be recommended for routine use, however, until its long term efficacy and safety have been established. Since we already have a well studied group of patients who have received treatment for 2 years, we are in a unique position to extend the study in order to provide the long-term (5-year) safety and efficacy data that does not appear to be forthcoming from any other source. The completion of this study will have a direct and immediate effect on the risk of blindness in people with diabetes by allowing doctors to predict more accurately the long term effects of this promising new treatment.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 64
• Est. completion date: July 2008
• Est. primary completion date: July 2008
• Accepts healthy volunteers: No
• Gender: Both
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

Participation in the study will be offered to all patients at the conclusion of the TDMO study. Currently we are still following 64 of the 69 (93%) eyes that were initially entered into the study that had reduced vision from diabetic macular oedema at baseline.

Exclusion Criteria:

• Uncontrolled glaucoma

• Loss of vision due to other causes (e.g. age related macular degeneration, myopic macular degeneration)

• known allergies to triamcinolone acetate, patient is already receiving systemic steroid treatment, intercurrent severe disease such as septicemia, any condition which would affect follow-up or photographic documentation (e.g. geographical, psycho-social, media opacities)

Study Design

Allocation: Non-Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Treatment

Related Conditions & MeSH terms

• Diabetic Macular Oedema
• Edema
• Macular Edema

Intervention

Drug:
• Triamcinolone acetate
When indicated, intravitreal triamcinolone (0.1 ml of Kenacort 40© [40mg/ml triamcinolone acetonide, Bristol-Myers Squibb pharmaceuticals, Australia]) was injected into the vitreous under sterile conditions in a minor procedures area.

Locations

Country	Name	City	State
Australia	Save Sight Institute, Sydney/Sydney Eye Hospital Campus, University of Sydney	Sydney	New South Wales

Sponsors (1)

Lead Sponsor	Collaborator
University of Sydney

Country where clinical trial is conducted

Australia, 

References & Publications (8)

Gillies M. Diabetic macular edema. Ophthalmology. 2009 Mar;116(3):595; author reply 596-7. doi: 10.1016/j.ophtha.2008.12.016. — View Citation

Gillies MC, Simpson JM, Gaston C, Hunt G, Ali H, Zhu M, Sutter F. Five-year results of a randomized trial with open-label extension of triamcinolone acetonide for refractory diabetic macular edema. Ophthalmology. 2009 Nov;116(11):2182-7. doi: 10.1016/j.op — View Citation

Gillies MC, Simpson JM, Zhu M, Hunt G, Ali H, Gaston C. Intravitreal triamcinolone. Ophthalmology. 2009 Mar;116(3):591. doi: 10.1016/j.ophtha.2008.09.044. — View Citation

Gillies MC, Sutter FK, Simpson JM, Larsson J, Ali H, Zhu M. Intravitreal triamcinolone for refractory diabetic macular edema: two-year results of a double-masked, placebo-controlled, randomized clinical trial. Ophthalmology. 2006 Sep;113(9):1533-8. Epub 2 — View Citation

Kuo CH, Gillies MC. Role of steroids in the treatment of diabetic macular edema. Int Ophthalmol Clin. 2009 Spring;49(2):121-34. doi: 10.1097/IIO.0b013e31819fcce8. Review. — View Citation

Larsson J, Kifley A, Zhu M, Wang JJ, Mitchell P, Sutter FK, Gillies MC. Rapid reduction of hard exudates in eyes with diabetic retinopathy after intravitreal triamcinolone: data from a randomized, placebo-controlled, clinical trial. Acta Ophthalmol. 2009 — View Citation

Larsson J, Zhu M, Sutter F, Gillies MC. Relation between reduction of foveal thickness and visual acuity in diabetic macular edema treated with intravitreal triamcinolone. Am J Ophthalmol. 2005 May;139(5):802-6. — View Citation

Sutter FK, Simpson JM, Gillies MC. Intravitreal triamcinolone for diabetic macular edema that persists after laser treatment: three-month efficacy and safety results of a prospective, randomized, double-masked, placebo-controlled clinical trial. Ophthalmology. 2004 Nov;111(11):2044-9. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Increase of =5 letters at the 5-year study visit on a LogMAR chart compared with (a) the initial baseline level and (b) the level at the 2-year study visit.	Changes from Baseline to 5 years: Improvement of =5 letters after 5 years was found in 14/33 (42%) eyes initially treated with triamcinolone compared with 11/34 (32%) eyes initially treated with placebo (zGEE=0.81, P=0.4).; Changes from 2 to 5 years (open-label extension):Improvement of =5 letters of best-corrected visual acuity was found in 8/29 (28%) eyes initial-triamcinolone compared with 7/28 (25%) initial-placebo eyes (zGEE=0.20, P=0.8).	3 year extension, total 5 years study from baseline	No
Primary	Incidence of moderate or severe adverse events over the 3 years of the open-label extension	The incidence of cataract surgery declined in the third year: 5/11 (45%) eyes from the initial-triamcinolone group that were phakic at the beginning of the 3rd year required cataract surgery.	3 year extension study, total 5 year study from baseline	Yes
Secondary	Change in macular thickness by OCT	Changes from Baseline to 5 years: Foveal thickness had decreased by 30µm (95% confidence interval, -47 to 107µm) less in the initial-triamcinolone group than in the initial-placebo group at 5 years (zGEE=0.76, P=0.45).; Changes from 2 to 5 years (open-label extension):Foveal thickness had actually increased slightly on average in the initial-triamcinolone group, but decreased in initial-placebo eyes. Overall it had decreased by 70µm (95% confidence interval, -1 to 140µm) more in the placebo group than in the treatment group between 2 and 5 years (zGEE=1.93, P=0.05).	3 year extension, total 5 year study from the baseline	No
Secondary	Any change in visual acuity	Loss of ten or more letters was found in 6/33 (18%) initial-triamcinolone eyes compared with 8/34 (24%) initial-placebo eyes.	3 year extension, total 5 year study from the baseline	No
Secondary	Number of laser treatments required.	During the third to fifth years of the study, a similar proportion of eyes from the 2 groups had macular edema that warranted laser treatment: initial-triamcinolone, 5/29 (17%); initial-placebo, 6/28 (21%).	3 year extension study, total 5 year study from baseline	No