PD-L1 Tumor Proportion Score 1-49

**Semantic type:** Laboratory or Test Result

**Definition:** A semi-quantitative finding indicating that 1-49 percent of the viable tumor cells in a sample are positive for PD-L1 expression by immunostaining.

**Synonyms:** - CD274 TPS 1-49 - PD-L1 TPS 1-49 - PD-L1 TPS 1-49% - PD-L1 Tumor Proportion Score 1 to 49 - PD-L1 Tumor Proportion Score 1-49 Percent - PDL1 TPS 1-49