Dose level	Dose of drug: anti-PD-1-antibody	Number enrolled	Number evaluable for toxicity
1a-1	1 mg/kg every 2 weeks	2	2
1a-2	3 mg/kg every 2 weeks	1	1
1a-3	200 mg every 3 weeks	0	0
1a-4	10 mg/kg every 2 weeks	0	0
1b	200 mg every 3 weeks	21	21