| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| We will include patients with colon cancer receiving endoscopic resection of tumor |  | 
| E.1.1.1 | Medical condition in easily understood language | 
| We will include patients with colon cancer |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Cancer [C04] | 
| MedDRA Classification | 
| E.1.3 | Condition being studied is a rare disease | Yes | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial | 
| To compare the immunological response between two different anesthesia strategies |  | 
| E.2.2 | Secondary objectives of the trial | 
| 1. Cancer free survival (follow up to 5 years postoperative) 2. Minor and major postoperative complications
 3. Postoperative VAS (Visual Analogue Scale) score
 4. Hospital stay
 5. Anesthetic variables
 
 |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| - All patients approved by the anesthesiologist for elective endoscopic  colon surgery for cancer. - > 18 year with written informed consent
 
 |  | 
| E.4 | Principal exclusion criteria | 
| - neoadjuvant chemo and/or radiotherapy - Perioperatieve conversion to an open surgical approach
 - Insufficient pain relief in the intervention group (Visual Analogue Scale (VAS) ≥ 4)
 - Absolute contra-indications for the use of any of the listed medications or procedures (epidural) in the intervention group
 - Synchronous metastasis (stage IV/ M1 patients)
 - Patients who are mentally disabled or incapable to give informed consent
 - Patients on chronic opioid therapy
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
| After inclusion of last patient |  | 
| E.5.2 | Secondary end point(s) | 
| 1. Cancer free survival (follow up to 5 years postoperative) 2. Minor and major postoperative complications
 3. Postoperative VAS (Visual Analogue Scale) score
 4. Hospital stay
 5. Anesthetic variables such as:blood pressure, heart rate, respiratory rate, carbon dioxide concentration, saturation, and BIS values will be documented prior before anesthesia and every 10 minutes thereafter. Data will be collected prospectively
 
 |  | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
| secondary endpoint 1 , 5 years after inclusion of last patient. Other secondary markers after inclusion of last patient.
 |  | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis | No | 
| E.6.2 | Prophylaxis | Yes | 
| E.6.3 | Therapy | No | 
| E.6.4 | Safety | No | 
| E.6.5 | Efficacy | No | 
| E.6.6 | Pharmacokinetic | No | 
| E.6.7 | Pharmacodynamic | No | 
| E.6.8 | Bioequivalence | No | 
| E.6.9 | Dose response | No | 
| E.6.10 | Pharmacogenetic | No | 
| E.6.11 | Pharmacogenomic | No | 
| E.6.12 | Pharmacoeconomic | No | 
| E.6.13 | Others | No | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) | No | 
| E.7.1.1 | First administration to humans | No | 
| E.7.1.2 | Bioequivalence study | No | 
| E.7.1.3 | Other | No | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) | No | 
| E.7.3 | Therapeutic confirmatory (Phase III) | No | 
| E.7.4 | Therapeutic use (Phase IV) | Yes | 
| E.8 Design of the trial | 
| E.8.1 | Controlled | Yes | 
| E.8.1.1 | Randomised | Yes | 
| E.8.1.2 | Open | Yes | 
| E.8.1.3 | Single blind | No | 
| E.8.1.4 | Double blind | No | 
| E.8.1.5 | Parallel group | No | 
| E.8.1.6 | Cross over | No | 
| E.8.1.7 | Other | No | 
| E.8.2 | Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) | Yes | 
| E.8.2.2 | Placebo | No | 
| E.8.2.3 | Other | No | 
| E.8.2.4 | Number of treatment arms in the trial | 2 | 
| E.8.3 | The trial involves single site in the Member State concerned | No | 
| E.8.4 | The trial involves multiple sites in the Member State concerned | Yes | 
| E.8.4.1 | Number of sites anticipated in Member State concerned | 3 | 
| E.8.5 | The trial involves multiple Member States | No | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA | No | 
| E.8.6.2 | Trial being conducted completely outside of the EEA | No | 
| E.8.7 | Trial has a data monitoring committee | No | 
| E.8.8 | Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial | 
| Inclusion of last patient: secondary outcomes will be retreived from medical records |  | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years |  | 
| E.8.9.1 | In the Member State concerned months |  | 
| E.8.9.1 | In the Member State concerned days |  |