Work up for staging: CT CAP with IV and oral contrast Endoscopic Ultrasound Bronchoscopy for tumors at/above the carina to rule out fistula Upper GI endoscopy/biopsy Consider staging laparoscopy: Best test to assess peritoneal metastases (mostly seen in signet ring histology). At least 15 LNs need to be removed during surgery Staging: T1a: Tumor invades the lamina propria or muscularis mucosae T1b: Tumor invades the submucosa T2: Tumor invades the muscularis propria T3: Tumor