Exploration of Lymph Node Metastasis and Tumor Deposit in the Posterior Gastric Mesentery for Distal Gastric Cancer

This study is examining surgical specimens from patients who underwent surgery for distal (lower) gastric cancer to better understand how cancer spreads to nearby lymph nodes — specifically in an area called the posterior gastric mesentery — to improve surgical techniques. **You may be eligible if...** - You are between 18 and 85 years old - You have been diagnosed with primary stomach (gastric) adenocarcinoma - Your cancer is Stage T2–T4, N0–N3, with no distant spread (M0) - You underwent distal gastrectomy with D2 lymph node dissection and complete mesogastric excision **You may NOT be eligible if...** - Your preoperative biopsy was negative - Your cancer was too advanced (T4b or metastatic M1) - Your BMI is over 30 Talk to your doctor to see if this trial is right for you.