Performance of SGM-101 for the Delineation of Primary and Recurrent Tumor and Metastases in Patients Undergoing Surgery for Colorectal Cancer

This trial is testing a special dye (called SGM-101) that lights up colorectal cancer cells during surgery, helping surgeons see the boundaries of tumors and any cancer that may have spread to the belly lining more clearly than the naked eye alone. **You may be eligible if...** - You are scheduled for surgery to treat colorectal cancer (either a large primary tumor, a recurrent cancer, or cancer that has spread to the lining of the abdomen) - You are a woman past menopause, or a woman who has had a procedure to prevent pregnancy, or a woman who tests negative for pregnancy before the injection **You may NOT be eligible if...** - You are pregnant or breastfeeding - You have a known allergy to the dye or its components - You are not scheduled for surgery - You have certain other conditions that make receiving the dye unsafe Talk to your doctor to see if this trial is right for you.