CD274 and metastatic malignant neoplasm in the lymph nodes: Pt0022, a 50-year-old woman with metastatic microsatellite instability-high endometrial carcinoma with locoregional recurrence and lymph node metastasis, treated with a combination involving an anti-PD1/PDL1 agent as second-line regimen, had 36 nonsynonymous mutations present in her baseline plasma sample, with VAF between 1% and 9%.