Neovascularization Patterns in Corneal Graft Rejection
Corneal transplantation is the most commonly performed human tissue transplant worldwide. Over 40,000 corneal transplants occur in the US each year. .
This study will determine specific corneal neovascularization (CN) patterns in human corneal allograft recipients to determine the characteristics that worsen the prognosis for graft survival. We will test the hypothesis that specific characteristics of CN are prognostic for corneal allograft rejection.
|Study Design:||Observational Model: Cohort
Time Perspective: Prospective
|Official Title:||Neovascularization Patterns in Corneal Graft Rejection|
- Corneal graft rejection [ Time Frame: 0 to 2 years after transplant ] [ Designated as safety issue: Yes ]
|Study Start Date:||November 2007|
|Estimated Study Completion Date:||December 2015|
|Estimated Primary Completion Date:||December 2013 (Final data collection date for primary outcome measure)|
The investigators hope to enroll 240 subjects into the study. These patients will be enrolled prior to penetrating keratoplasty. They will be examined by the full protocol preoperatively, and postoperatively at 1 week, 1, 3, 6, 12, 18, and 24 months. During these visits slit lamp biomicroscopy will be used to study CN patterns, and take slit lamp photographs if there is any neovascularization detected, permitting us to develop algorithms of CN characteristics that are predictive for corneal allograft rejection and failure. The corneal tissue removed during these patients' surgeries will be evaluated histopathologically to identify inflammation and neovascularization to confirm and compare to what is seen clinically. There will be two short questionnaires conducted at each visit to assess stress levels.