2.4. Exclusion criteria
tumor, colorectal tumors
NEUROENDOCRINE TUMOR, TUMOR
Patients will be excluded if pre-operative examinations show indications of deep submucosal invasion; if the lesion is preoperatively diagnosed as a neuroendocrine tumor; if the tumor cannot be visualized in its entirety even with inversion; if the tumor crosses the anal canal, terminal ileum, appendix, or diverticulum; or if patients are eligible for ESD of ≥ 2 with colorectal tumors. Patients will also be excluded if their platelet counts are < 50,000/μL; if they are taking 2 or more antiplatelet agents or an anticoagulant other than warfarin; or if they are taking warfarin with a PT-INR ≥ 2.6, or a PT-INR ≥ 3.0 following mitral valve replacement surgery.