A Study of GC101 TIL in Advanced Breast Cancer (10hospital)

This study is testing a type of immune cell therapy called GC101 TIL (tumor-infiltrating lymphocytes) for people with advanced breast cancer. The therapy uses immune cells taken from the patient's own tumor, grown in large numbers in a lab, and then infused back into the patient to fight the cancer. **You may be eligible if...** - You are between 18 and 75 years old - You have been diagnosed with breast cancer (primary, relapsed, or metastatic) - Standard treatments have not worked, or there are no standard options available - Your tumor can be biopsied or surgically removed to collect immune cells - You have adequate blood counts, kidney, and liver function - Your expected survival is more than 3 months and you are in reasonably good health **You may NOT be eligible if...** - You are pregnant or breastfeeding - You have HIV, active hepatitis B or C, or syphilis - You have a serious heart or lung condition - You have had an organ transplant or stem cell transplant - You received another cancer treatment within the last month - You are on high-dose steroids for an autoimmune condition Talk to your doctor to see if this trial is right for you.