| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| nodal follicular lymphoma grade 1 or grade 2 in the clinical stage I or II (Ann Arbor classification) |  | 
| E.1.1.1 | Medical condition in easily understood language | 
| nodal follicular lymphoma |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Blood and lymphatic diseases [C15] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| 
| E.1.2 | Version | 23.0 |  
| E.1.2 | Level | PT |  
| E.1.2 | Classification code | 10029603 |  
| E.1.2 | Term | Non-Hodgkin's lymphoma stage II |  
| E.1.2 | System Organ Class | 10029104 - Neoplasms benign, malignant and unspecified (incl cysts and polyps) |  | 
| 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 | 
| Evaluation of the rate of morphologic CR in week 18 after standard dose (24 Gy) involved site (IS) radiotherapy (RT) plus Rituximab or low-dose (4 Gy) IS RT in combination with Obinutuzumab in early stage nodal follicular lymphoma (centrally reviewed) |  | 
| E.2.2 | Secondary objectives of the trial | 
| ●	Morphologic CR, PR, SD, PD in week 7 and month 6 in patients with initially remaining lymphoma judged by CT/MRI ●	Metabolic CR in week 18 in patients with initially remaining lymphoma judged by FDG-PET/CT (centrally reviewed)
 ●	Progression-free survival (PFS) of each treatment arm (2 years after individual treatment start)
 ●	PFS of patients in stage I0 after diagnostic surgery (no remaining lymphoma) treated as the experimental arm (2 years after individual treatment start)
 ●	Toxicity (NCI-CTC criteria, version 5) of all patients
 ●	Relapse rate and pattern of recurrence of each treatment arm at all follow-up visits.
 ●	Overall survival (OS) of each treatment arm (2 years)
 ●	Quality of life according EORTC QLQ C30 and FACT-Lym questionnaires at inclusion and in week 18, month 12, and 24 (each treatment arm)
 
 |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| •	Centrally reviewed CD20-positive follicular lymphoma grade 1/2 or 3a based on WHO classification (2008) •	Untreated (radiation-, chemo- or immunotherapy) nodal follicular lymphoma (including involvement of Waldeyer´s ring)
 •	Age: ≥18 years
 •	ECOG: 0-2
 •	Stage: clinical stage I or II (Ann Arbor classification) based on FDG-PET Staging
 •	Risk profile: Largest diameter of the lymphoma ≤ 7 cm (sectional images)
 •	Written informed consent and willingness to cooperate during the course of the trial
 •	Adequate bone marrow capacity: ANC ≥ 1.5 x 103/ml, thrombocytes ≥ 100000 x 10 3/ml, hemoglobin ≥ 10 g/dL
 •	Capability to understand the intention and the consequences of the clinical trial
 •	Adequate contraception for men and women of child-bearing age during therapy and 18 months thereafter
 
 |  | 
| E.4 | Principal exclusion criteria | 
| ●	Extra nodal manifestation of follicular lymphoma ●	Secondary cancer in the patient's medical history (exclusion: basalioma, spinalioma, melanoma in situ, bladder cancer T1a, non-metastasized solid tumor in constant remission, which was diagnosed >3 years ago)
 ●	Serious disease interfering with a regular therapy according to the study protocol, e.g: congenital or acquired immune-deficiency syndromes, active infections including viral hepatitis, uncontrolled concomitant diseases including significant cardiovascular or pulmonary disease
 ●	Severe psychiatric disease
 ●	Pregnancy / lactation
 ●	Known hypersensitivity against Obinutuzumab or Rituximab drugs with similar chemical structure or any other additive of the pharmaceutical formula of the study drug
 ●	Active hepatitis B infection (inactive hepatitis B infections require additional prophylactic anti-viral medication for 1 year (e.g. Lamivudin, Entecavir, Tenofovir)
 ●	Participation in another interventional trial or follow-up period of a competing trial which can influence the results of this current trial
 
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| ●	Morphologic complete response (CR) in week 18 in patients with remaining macroscopic PET positive lymphoma after initial diagnostic biopsy judged by CT |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point |  | 
| E.5.2 | Secondary end point(s) | 
| ●	Morphologic CR, PR, SD, PD in week 7 and month 6 in patients with initially remaining lymphoma judged by CT/MRI ●	Metabolic CR in week 18 in patients with initially remaining lymphoma judged by FDG-PET/CT
 ●	Progression-free survival (PFS) of each treatment arm (2 years after individual treatment start)
 ●	PFS of patients in stage I0 after diagnostic surgery (no remaining lymphoma) treated as the experimental arm (2 years after individual treatment start)
 ●	Toxicity (NCI-CTC criteria, version 5) of all patients
 ●	Relapse rate and pattern of recurrence of each treatment arm at all follow-up visits.
 ●	Overall survival (OS) of each treatment arm (2 years)
 ●	Quality of life according EORTC QLQ C30 and FACT-Lym questionnaires at inclusion and in week 18, month 12, and 24 (each treatment arm)
 
 |  | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
| week 7, week 18, month 6, month 12 and 24 |  | 
| 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 | Yes | 
| E.6.4 | Safety | No | 
| E.6.5 | Efficacy | Yes | 
| 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) | Yes | 
| E.7.4 | Therapeutic use (Phase IV) | No | 
| 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 | Yes | 
| 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 | 15 | 
| 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 | Yes | 
| 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 | 7 | 
| E.8.9.1 | In the Member State concerned months |  | 
| E.8.9.1 | In the Member State concerned days |  |