Analysis of Tumor Deposit at the Fusion Site of the Right Gastric Mesentery and Left Gastric Mesentery in the Patients With Gastric Cancer Who Received Proximal Gastrectomy

This study is analyzing tissue samples from patients who had proximal gastrectomy (upper stomach removal) for stomach cancer. Researchers want to understand how tumor deposits (small clusters of cancer cells) form at specific areas in the stomach and whether this affects cancer staging and treatment planning. **You may be eligible if...** - You are 18 to 85 years old - You have confirmed primary gastric adenocarcinoma from a pre-surgery biopsy - Your cancer was assessed as a stage without distant spread - You had a proximal gastrectomy with D2 lymph node dissection - You are in reasonably good surgical health (ASA class I-III) **You may NOT be eligible if...** - Your pre-surgery biopsy was negative - Your cancer had spread to distant organs - Your BMI exceeds 30 - You received chemotherapy or radiation before surgery - You had prior upper abdominal surgery - You have another active cancer - You declined surgery Talk to your doctor to see if this trial is right for you.