| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| Patients with advanced or metastatic melanoma or renal cell carcinoma treated with nivolumab monotherapy in a 480mg or 6 mg/kg 4 weekly scheme (either from start or after combination therapy with ipilimumab), have a confirmed CR, PR or SD, are at least 6 months on treatment and are willing to receive 3 reduced doses of 240 mg |  
| Patiënten met gevorderd of uitgezaaid melanoom of niercelcarcinoom, behandeld met nivolumab monotehrapie in een 4-wekelijks 480mg of 6mg/kg schema, die een bevestigde CR, PR of SD hebben, minimaal 6 maanden behandeling hebben gehad en bereid zijn om 3 gereduceerde nivolumab doseringen te ontvangen. |  | 
| E.1.1.1 | Medical condition in easily understood language | 
| Patients with advanced or metastatic melanoma or renal cell carcinoma treated with nivolumab monotherapy and have a durable response |  
| Patiënten met gevorderd of uitgezaaid melanoom of niercelcarcinoom, behandeld met nivolumab monotherapie en een duurzaam respons. |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Cancer [C04] | 
| 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 primary objective is to demonstrate that the nivolumab steady-state level after 3 cycles with a reduced nivolumab dosage (240 mg every 4 weeks) is not lower than the nivolumab concentration 4 weeks after the first 480 mg or 6mg/kg dose. |  
| Aantonen dat de nivolumab steady-state spiegels na 3 kuren met een gereduceerde dosering (240 mg, 4 wekelijks) niet lager is dan de spiegel na de eerste kuur met 480 mg or 6 mg/kg. |  | 
| E.2.2 | Secondary objectives of the trial | 
| -	Explore PD1 receptor occupancy in PBMCs -	Safety of reduced nivolumab doses
 -	Efficacy of reduced nivolumab doses
 -	Pharmacokinetic profile of nivolumab
 -	Cost effectiveness
 
 |  
| - PD1 receptor bezetting onderzoeken in PBMCs - Veiligheid van gereduceerde nivolumab doseringen
 - Effectiviteit van gereduceerde nivolumab doseringen
 - Pharmacokinetisch profiel van nivolumab
 - Kosten-effectiviteit
 |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.2.3.1 | Full title, date and version of each sub-study and their related objectives |  | 
| E.3 | Principal inclusion criteria | 
| 1.	Age ≥ 18 years 2.	Advanced or metastatic melanoma or renal cell carcinoma
 3.	Current treatment with nivolumab in a 480 mg or 6mg/kg, 4 weekly scheme
 4.	Documented confirmed and ongoing CR, PR or SD according to RECIST v1.1
 5.	On treatment for at least 6 months
 
 |  
| 1. Leeftijd ≥ 18 jaar 2. Gevorderd of gemetastaseerd melanoom of niercelcarcinoom
 3. Huidige behandeling met nivolumab in een 4 wekelijks 480 mg of 6mg/kg schema
 4. Beschreven en bevestigd voortdurende CR, PR of SD volgens RECIST v1.1
 5. Minimaal 6 maanden op behandeling
 
 |  | 
| E.4 | Principal exclusion criteria | 
| -	Unable to draw blood for study purposes -	Patients willing to participate or already included in the SAFE-STOP trial
 
 |  
| - Niet mogelijk om bloed af te nemen - Patiënt wil of neemt reeds deel aan SAFE-STOP trial
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| Difference between the mean trough level 4 weeks after the 3rd nivolumab dose of 240 mg and the mean trough level 4 weeks after treatment start (i.e. 4 weeks after the first 480 mg or 6mg/kg dose) |  
| Verschil tussen nivolumab dalspiegels op 4 weken na de 3de gereduceerde kuur van 240 mg met de dalspiegels na de 1ste kuur met 480 mg of 6mg/kg |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
| 4 weeks after the 3rd reduced dose of 240 mg and 4 weeks after the 1st dose of 480 mg or 6mg/kg |  
| 4 weken na 3de gereduceerde kuur van 240 mg en 4 weken na 1ste kuur van 480 mg of 6mg/kg |  | 
| E.5.2 | Secondary end point(s) | 
| -	PD-1 receptor occupancy in PBMCs, measured 4 weeks after 3 reduced nivolumab doses -	Grade ≥3 adverse events during reduced doses
 -	Number of patients with new PD during 3 reduced doses
 -	Pharmacokinetic profile of nivolumab
 -	Cost effectiveness
 
 |  
| - PD-1 receptor bezetting in PBMCs, gemeten 4 weken na de 3rde gereduceerde nivolumab dosering - Graad ≥3 bijwerkingen tijdens de gereduceerde kuren
 - Aantal patiënten met nieuwe PD tijdens de gereduceerde kuren
 - Pharmacokinetisch profiel van nivolumab
 - Kosten-effecitiviteit
 |  | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
| 4 weeks after the 3rd reduced dose of 240 mg |  
| 4 weken na de 3de gereduceerde nivolumab dosering. |  | 
| 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 | Yes | 
| 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 | 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.8.2.4 | Number of treatment arms in the trial | 1 | 
| 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 | 2 | 
| 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 | 2 | 
| E.8.9.1 | In the Member State concerned months | 4 | 
| E.8.9.1 | In the Member State concerned days | 0 |