We report a single-arm phase 2 trial of pembrolizumab in advanced malignant peripheral nerve sheath tumors at Oslo University Hospital. Long-lasting response in 1 of 8 patients was associated with high tumor density of PD-1+CD8+ T cells. Mixed response in another patient was associated with PD-L1 expression, and PD-L1 was mostly not co-expressed on CD68+ macrophages or CD8+ cells. The study was prematurely closed due to a slow accrual rate.
Sveen et al. (Fri,) studied this question.