Please select the eligibility criteria that correspond to the clinical trial below.
Title: Effect of Pre-operative Adjunctive Anti-VEGF on Growth Factors in Severe Proliferative Diabetic Retinopathy Requiring Surgical Management
Brief Summary: The purpose of this study is to determine the effect of anti-VEGF drug (Avastin) adminstration in eyes prior to surgical treatment for Traction retinal detachment (TRD) in patients with Proliferative Diabetic Retinopathy (PDR).


Options:
A: Inclusion Criteria:

* Active fibrovascular proliferation due to PDR with TRD given pre-operative clearance for pars plana vitrectomy (PPV) and TRD repair.

Exclusion Criteria:

* Dense vitreous hemorrhage
* Inability to follow-up for surgery within 3-7 days after intravitreal injection
* History of stroke, thromboembolic event, or heart attack within the last 6 months
* Less than 18 years of age
* Pregnancy
B: Inclusion Criteria:

* Macular traction retinal detachment lasting three months or less secondary to diabetic retinopathy.

Exclusion Criteria:

* Massive vitreous hemorrhage preventing from detailed posterior pole examination;
* Previous intra-ocular surgery other than cataract surgery
* Hemodialysis, known bleeding disorders or use of anticoagulants drugs other than aspirin
* Prothrombin time, partial thromboplastin time or platelet count without normal limits
* History of previous thromboembolic events
C: Subject-level Criteria

Inclusion

To be eligible, the following inclusion criteria must be met:

Age \>= 18 years Diagnosis of diabetes mellitus (type 1 or type 2) At least one eye meets the study eye criteria listed below Able and willing to provide informed consent.

Exclusion

A subject is not eligible if any of the following exclusion criteria are present:

A condition that, in the opinion of the investigator, would preclude participation in the study (e.g., unstable medical status including blood pressure, cardiovascular disease, and glycemic control).

A condition that, in the opinion of the investigator, would preclude subject undergoing elective vitrectomy surgery if indicated during the study.

Participation in an investigational trial that involved treatment with any drug within 30 days of randomization that has not received regulatory approval at the time of study entry.

Known allergy to any component of the study drug. Blood pressure \> 180/110 (systolic above 180 or diastolic above 110). Myocardial infarction, other cardiac event requiring hospitalization, stroke, transient ischemic attack, or treatment for acute congestive heart failure within 4 months prior to randomization.

Systemic anti-VEGF or pro-VEGF treatment within 4 months prior to randomization.

For women of child-bearing potential: pregnant or lactating or intending to become pregnant within the next 4 months.

Subject is expecting to move out of the area of the clinical center to an area not covered by another clinical center during the 12 months of the study.

Study Eye Criteria

The subject must have at least one eye meeting all of the inclusion criteria and none of the exclusion criteria listed below.

A subject can have only one study eye. If both eyes are eligible at the time of randomization, the study eye will be selected by the investigator and subject before randomization.

The eligibility criteria for a study eye are as follows:

Inclusion

Vitreous hemorrhage causing vision impairment, presumed to be from proliferative diabetic retinopathy, and precluding completion of panretinal photocoagulation (or precluding assessment of completeness of prior PRP).

Immediate vitrectomy not required (investigator and subject are willing to wait at least 8 weeks to see if hemorrhage clears sufficiently without having to proceed to vitrectomy).

Visual acuity is light perception or better.

Exclusion

Prompt vitrectomy indicated, such as because of signs of rhegmatogenous retinal detachment or traction detachment involving the macula present on ultrasound.

Exam evidence of neovascular glaucoma, angle neovascularization, or active neovascularization of the iris (small iris tufts not an exclusion).

History of intravitreal anti-VEGF treatment for vitreous hemorrhage at any time in the past or for an indication other than vitreous hemorrhage in the past 2 months.

History of major ocular surgery (including cataract extraction, scleral buckle, any intraocular surgery, etc.) within prior 4 months or major ocular surgery other than vitrectomy anticipated within the next 6 months following randomization.

History of vitrectomy. History of yttrium aluminum garnet capsulotomy performed within 2 months prior to randomization.

Aphakia. Uncontrolled glaucoma (in investigator's judgment). Exam evidence of severe external ocular infection, including conjunctivitis, chalazion, or substantial blepharitis.
D: Inclusion Criteria:

* vitreous haemorrhage
* tractional retinal detachment
* active proliferative diabetic retinopathy.

Exclusion Criteria:

* neovascular glaucoma
* cataract
* combined traction and rhegmatogenous RD

Answer: A