Efficacy and Safety of Photodynamic Therapy for CIN3

This study is testing photodynamic therapy (a treatment using light-activated medication) as a way to treat a pre-cancerous cervical condition called CIN3 — a severe abnormality of cervical cells that, if untreated, could develop into cervical cancer. **You may be eligible if...** - You have been diagnosed with CIN3 (severe cervical cell changes) - Your abnormal area can be fully seen during a colposcopy exam - The abnormal area is in a type 1 or type 2 transformation zone (a specific location on the cervix) **You may NOT be eligible if...** - Your doctor suspects or has confirmed cervical cancer - Your most recent cervical smear (TCT) showed high-grade abnormality - The abnormality involves glandular cells inside the cervix - You have a condition called porphyria or are sensitive to light therapy Talk to your doctor to see if this trial is right for you.