In the first stage, 13 evaluable patients will be accrued per cohort. Evaluable is defined as: at least one administration of nivolumab and availability of paired biopsies for immunohistochemistry (for induction treatment cohorts pre-induction and pre-nivolumab biopsies).
If there are 1 or no responses observed in these 13 patients, the cohort will be stopped. Otherwise, 21 additional patients will be accrued for a total of 34.
