PDCD1 and sarcomatoid carcinoma: Partial responses (at least 30% regression in target tumor burden) were seen in three patients; one patient with LPS who was treated with single-agent nivolumab (unknown PD1 and PDL1 status), one with inflammatory myofibroblastic sarcoma who was treated with single-agent nivolumab (positive PD1, but negative PDL1 status), and one with sarcomatoid carcinoma who was treated with single-agent pembrolizumab (positive PD1 and PDL1 status) (Fig. 1).