To evaluate clinical outcome for patients receiving treatment of suspected premalignant and malignant gastrointestinal lesions at Interventional Endoscopy Services. The primary outcome is curative endoscopic resection. Secondary outcomes include resection technique utilized, rates of en bloc resection and adverse event rates, including infection, bleeding, perforation and death, and one-year survival rates.

Inclusion Criteria:

• Patients age >18 years that have been referred for endoscopic treatment of GI lesions.

Exclusion Criteria:

• Patients for whom endoscopic treatment was not performed.

Patients referred to Interventional Endoscopy Services at CPMC for treatment of GI tract tumors.