China Early Esophageal Cancer Cohort

This study is building a long-term database of patients in China who were treated for early-stage esophageal (food pipe) cancer using a minimally invasive procedure called endoscopic submucosal dissection (ESD), where a thin camera is used to remove a surface tumor without open surgery. The goal is to understand long-term outcomes and identify patterns of recurrence. **You may be eligible if...** - You are 18–85 years old - You had ESD performed to treat an early-stage squamous cell cancer of the esophagus, and the procedure followed current guidelines - Your tumor was at an early stage (pT1a or pT1b) after the procedure - You have been followed up for at least 3 years after your ESD, or your cancer returned or spread to lymph nodes during follow-up **You may NOT be eligible if...** - You received chemotherapy or radiation to the esophagus, or had esophageal surgery, before the ESD procedure - You have a history of stomach or duodenal cancer, pre-cancerous growths, or adenomas Talk to your doctor to see if this trial is right for you.