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Ординатура / Офтальмология / Английские материалы / Retinal Pharmacotherapy_Rodrigues, Nguyen, Farah_2010.pdf
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Change in retinal thickness

 

 

−50

 

 

 

in microns

−100

 

 

 

−150

 

 

 

Reductions

−200

 

 

 

−250

 

 

 

 

 

 

 

 

−300

 

 

 

 

−350

 

 

 

 

0

4

8

12

A

 

 

Study week

 

 

 

 

 

0.5 mg 4 wk

 

2.0 mg 12 wk

 

4.0 mg 12 wk

 

 

0.5 mg 12 wk

 

2.0 mg 4 wk

 

 

 

 

 

 

15

Change in best corrected visual acuity

 

 

 

 

gained

10

 

 

q4

 

 

 

weekly

 

 

 

dosing

Letters

 

 

 

5

 

 

q12

 

 

 

 

 

 

 

 

 

 

 

weekly

 

 

 

 

dosing

 

0

 

 

 

B

0

4

8

12

 

 

Study week

 

0.5 mg 4 wk

 

2.0 mg 4 wk

 

4.0 mg 12 wk

 

 

0.5 mg 12 wk

 

 

2.0 mg 12 wk

 

 

 

 

 

 

weeks, but no less frequently than every 12 weeks, based on specific retreatment criteria.16

The primary objective will be to assess the efficacy of intravitreally administered VEGF Trap-Eye compared to ranibizumab in a noninferiority paradigm in preventing moderate vision loss in subjects with all subtypes of neovascular AMD. One secondary objective will be to assess the safety and tolerability of repeated intravitreal administration of VEGF Trap-Eye in patients with all subtypes of neovascular AMD for periods up to 2 years. Another secondary objective will be to assess the effect of repeated intravitreal administrations of VEGF Trap-Eye on vision-related quality of life (QOL) in subjects with all subtypes of neovascular AMD, as assessed using the National Eye Institute VFQ-25 questionnaire.16

DIABETIC MACULAR EDEMA PHASe I

CLINICaL STUDY

The initial phase I study of VEGF Trap-Eye in DME, CLEAR-IT DME, was an exploratory study of the safety, tolerability, and biological effect of a single intravitreal administration of VEGF Trap-Eye in patients with DME.37 The study was conducted at two centers involving 5 patients. It was an open-label study evaluating a single intravitreal injection of 4 mg VEGF Trap-Eye. Patients were followed for 6 weeks for safety, BCVA, centerpoint thickness, and macular volume by OCT.

The maximum change from baseline in key outcome measures at 6 weeks included reductions in centerpoint retinal thickness, with a mean reduction of 115.4 µm and a median reduction of 118 µm (P < 0.03). Macular volume was reduced by a mean of 1 µm3 and a median of 0.6 µm3 (P < 0.04). ETDRS BCVA letters improved by a mean of 6.8 and a median of 9 (P < 0.03).37

Intravitreal injection of VEGF Trap-Eye for DME in a phase I study showed only mild ocular adverse events that were related to the injection procedure. No serious ocular adverse events were reported.37

A phase II dose-ranging study comparing various doses of VEGF Trap-Eye administered at various dosing intervals to focal laser treatment is currently in development.

Figure 37.5  Retinal thickness and visual acuity in individual groups are shown separately (mean ± sem). Monthly and quarterly dosing did not result in substantially different results at 8 weeks. Even quarterly dosing resulted in substantial improvements at week 8 (range of means, 4.4–5.4 letters gained), and at week 12 (range of means, 2.8–5.1 letters gained). Monthly dosing was numerically superior at 12 weeks, though not statistically significant. Monthly dosing resulted in continued best corrected visual acuity (BCVA) improvement through week 12 (range of means at week 12, 8.8–10.4 letters gained).

administration versus monthly dosing of ranibizumab in patients with neovascular AMD. Four equal treatment groups will be followed for a 52-week primary endpoint. Three VEGF Trap-Eye treatment groups, 0.5 mg q 4 weeks, 2.0 mg q 4 weeks, and 2.0 mg q 8 weeks, will be compared with ranibizumab 0.5 mg q 4 weeks. A 3-monthly loading dose of VEGF Trap-Eye will be administered to all VEGF Trap-Eye subgroups. All VEGF Trap-Eye and ranibizumab patients will be treated on a PRN basis in year 2, with reinjection required at least once every 3 months. Men and women 50 years of age or older with subfoveal CNV due to neovascular AMD will be included who meet the inclusion criteria of: (1) active primary subfoveal CNV lesions secondary to AMD (including juxtafoveal lesions that affect the fovea); (2) 50% active CNV; and (3) best corrected ETDRS protocol visual acuity of 20/40–20/320 (letter score of 7325) in the study eye.

During the second year of study, patients will be evaluated every 4 weeks and will receive an intravitreal injection at least every 12 weeks. During this period, injections may be given as frequently as every 4

SUMMARY AND KEY POINTS

Existing anti-VEGF therapies have transformed the treatment of wet AMD into a disease in which improvement of vision may be expected by both patients and physicians. However, medications that allow for greater efficacy, or efficacy for more patients, and/or a longer dosing interval are still desired by physicians and patients, reflecting a continuing medical need for better treatments.

VEGF Trap-Eye, a fusion protein of VEGF receptors 1 and 2, is a promising treatment currently in development. It is fully human and has high affinity, binding VEGF more tightly than native receptors or monoclonal antibodies. It blocks all VEGF-A isoforms, VEGF-B, and PlGF, and, based on its molecular weight, should penetrate all retinal layers. Unlike antibody complexes, VEGF-Trap forms inert complexes that do not interact further with the VEGF receptor.

VEGF Trap-Eye has thus far demonstrated clinical activity with an acceptable safety profile in clinical trials. The CLEAR-IT DME study demonstrated reduced retinal thickness and improved vision in this common visual disease associated with diabetes. In CLEAR-IT 1 and 2 AMD studies, improved visual acuity and reduced retinal thickness were demonstrated. VEGF Trap-Eye was also generally safe and well tolerated. The two current phase III studies for neovascular AMD, VIEW 1 (USA and Canada) and VIEW 2 (Europe, Asia Pacific, Japan, and Latin America), will help to determine whether VEGF Trap-Eye can offer differential efficacy and/or longer dosing intervals relative to currently available agents.

It is hoped that future armamentaria for managing retinal vascular diseases will include VEGF Trap-Eye as one of their therapeutic agents.

Diseases Retinal in Mechanisms and Drugs • 4 section

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• 37Trapchapter-VEGF Proteins: Fusion

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