| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| Crohn´s disease Ulcerative colitis
 |  | 
| E.1.1.1 | Medical condition in easily understood language | 
| Crohn´s disease Ulcerative colitis
 |  
| Crohns sjukdom Ulcerös kolit
 |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Digestive System Diseases [C06] | 
| MedDRA Classification | 
| E.1.3 | Condition being studied is a rare disease | No | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial | 
| The aim is to identify clinical and biological markers that offer guidance as to which patients successfully may discontinue maintenance anti-TNF treatment, and which patients on the contrary need to continue treatment over an extended period of time in order to remain in remission. |  | 
| E.2.2 | Secondary objectives of the trial |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| For patients with ulcerative colitis: • Diagnosis: Ulcerative colitis
 • Age 18-80 years.
 • Male or female.
 • IFX or ADA treatment since >12 months; last 3 doses  at the same dose and interval. If the patient is on a biosimilar-infliximab the patient must have received at least 3 doses, and at the same dose and interval.
 • SCCAI score of ≤3.
 • Endoscopic Baron score of 0-1. The most inflamed part in the rectum/ sigmoid colon is evaluated. A minimum of 40 cm of the colon should be examined.
 
 For patients with Crohn's disease:
 • Diagnosis: Crohn's disease
 • Age 18-80 years.
 • Male or female.
 • IFX or ADA treatment since >12 months; last 3 doses at the same dose and interval. If the patient is on a biosimilar-infliximab the patient must have received at least 3 doses, and at the same dose and interval.
 • Simplified HBI (sHBI; abdominal palpation excluded) score of ≤4.
 • Simplified Endoscopic Score for CD (SES-CD) of ≤4 and no ulcer ≥5 mm other than a potential anastomotic ulcer (ie apthous ulcers allowed).
 • F-calprotectin <200 mg/kg (PhiCal) or <350 mg/kg (Buhlmann).
 
 |  | 
| E.4 | Principal exclusion criteria | 
| For patients with ulcerative colitis: • Corticosteroid (rectal or systemic) or rectal 5-ASA treatment during the last 6 months.
 • Colonic resection.
 • Pregnancy.
 
 For patients with Crohn's disease:
 • Documented engagement/inflammation of the small bowel proximally of a level of 50 cm from the ileocecal valve. Any examination modality is accepted, and a current/new small intestinal examination is not required. A limited number of small (<5 mm) lesions on capsule endoscopy allowed.
 • Corticosteroid (rectal or systemic) or rectal 5-ASA treatment during the last 6 months.
 • Colonic surgery with removal of more than half of the transverse colon.
 • Pregnancy.
 
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| The proportion of patients that relapses, as defined by symptomatic scoring in combination with endoscopy, at 12 and 24 months after discontinuation of anti-TNF treatment with identification of factors at study-start that correlate positively or negatively with the event of relapse. |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
| time-points 12 and 24 months |  | 
| E.5.2 | Secondary end point(s) | 
| • Endoscopic scores at 12 and 24 months among those who relapsed compared to those who remained in remission. • Fecal calprotectin levels at 12 and 24 months among those who relapsed compared to those who remained in remission.
 • Fecal calprotectin levels  at study start among ulcerative colitis patients who relapsed compared to those who remained in remission.
 • The rate of relapse among ulcerative colitis patients with the following fecal calprotectin level ranges (<30 mg/kg for Calpro [C] and <60 mg/kg for Buhlmann [B]; 30-99 mg/kg C and 60-199 mg/kg B; 100-299 mg/kg C and 200-599 mg/kg B; ≥300 mg/kg C and ≥600 mg/kg B.
 • The optimal fecal calprotectin level cut-off with regards to sensitivity and specificity for relapse, for ulcerative colitis and Crohn's disease patients, respectively.
 • Trough concentrations of infliximab and adalimumab among those who relapsed compared to those who remained in remission.
 • The rate of relapse among those with undetectable infliximab or adalimumab trough concentrations, those with 0.5-2.9 ug/ml, 3.0-7.0 ug/ml, >7.0 ug/ml for infliximab, and ≥10.0 ug/ml for adalimumab.
 • The optimal trough concentration cut-off with regards to sensitivity and specificity for relapse, for infliximab and adalimumab, respectively.
 • Area under the infliximab or adalimumab concentration curve during the last therapy cycle among those who relapsed compared to those who remained in remission.
 • Presence of anti-drug antibodies among those who relapsed compared to those who remained in remission.
 • The rate of relapse among those with anti-drug antibodies versus those without.
 • Time to relapse among those who relapse, comparing ADA versus IFX treated and UC versus CD.
 • The level of gut microbiota dysbiosis among those who relapsed compared to those who remained in remission.
 • The rate of relapse among those with a dysbiosis score of 1, 2-3, and 4-5, respectively.
 • Correlation analyses of genes showing high versus low expression in mucosal biopsies and blood samples, with the event of relapse.
 • Correlation analyses of gene-variants with the event of relapse.
 • Additional factors that will be correlated with relapse rates: Endoscopic scores (Baron score 0 versus 1 for UC and SES-CD 0-1 versus 3-4 for Crohn's disease); corticosteroid use between 12 and 6 months before baseline; previous anti-TNF treatment; dose intensification of anti-TNF treatment; mono- versus concomitant immunomodulator-treatment; previously maximal inflammatory extent (Montreal classification); disease duration (<2 years, <5 years, <10 years, >10 years); extraintestinal manifestations; gender; smoking; hemoglobin; white blood cell count; platelet count; CRP; and histology/immunohistochemistry (basal plasmocytosis and numbers of different leukocyte and lymphocyte subpopulations).
 
 |  | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point |  | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis | No | 
| E.6.2 | Prophylaxis | No | 
| 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 | Yes | 
| E.6.13.1 | Other scope of the trial description | 
| Therapy de-escalation |  
| Terapiutsättning |  | 
| 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 | No | 
| E.8.1.1 | Randomised | No | 
| 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) | No | 
| E.8.2.2 | Placebo | No | 
| E.8.2.3 | Other | No | 
| 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 | 23 | 
| 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 |  | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 4 | 
| E.8.9.1 | In the Member State concerned months |  | 
| E.8.9.1 | In the Member State concerned days |  |