PD-L1 Tumor Proportion Score Greater than or Equal to 50

**Semantic type:** Laboratory or Test Result

**Definition:** A semi-quantitative finding indicating that at least 50 percent of the viable tumor cells in a sample are positive for PD-L1 expression by immunostaining.

**Synonyms:** - CD274 TPS Greater than or Equal to 50 - PD-L1 TPS Greater than or Equal to 50 - PD-L1 Tumor Proportion Score Greater than or Equal to 50 Percent - PDL1 TPS Greater than or Equal to 50 - TPS score greater than or equal to 50%