This is a single-center, investigator-initiated, prospective observational registry that will collect longitudinal clinical data on adult patients (≥18 years) undergoing endoscopic ultrasound (EUS)-guided radiofrequency ablation (RFA) or microwave ablation (MWA) for pancreatic and other gastrointestinal/hepatobiliary lesions as part of routine clinical care. The registry will not alter standard-of-care management. Data will be abstracted from the medical record and routine clinical systems. Primary outcomes include change in target lesion size on clinically obtained imaging and overall survival following ablation. Secondary outcomes include changes in tumor biomarkers, adverse events, non-target lesion changes, and patient-reported symptoms.