Macugen for Proliferative Diabetic Retinopathy Study With Extended Dosing (M-PDRS ED)

"Patients assigned to either IV Mac Q6Arm will receive a total of 3 intravitreal pegaptanib sodium injections administered at 6-week intervals beginning on Day 0 and ending at Week 12. The group will then receive an intravitreal injection every 12 weeks.~Patients assigned to IV Mac Q6Arm will receive a total of 3 intravitreal pegaptanib sodium injections administered at 6-week intervals beginning on Day 0 and ending at Week 12. After the third injection subjects in this group will receive Selective Laser Photocoagulation at Week 18.~Patients assigned to Panretinal Photocoagulation will act as the control group. Subjects in this group will receive standard Panretinal Photocoagulation using a modified ETDRS protocol.~All intravitreal study injections will consist of 0.3 milligrams (mg) of pegaptanib sodium delivered by intravitreal injection."