For instance, the summary estimates of PD-L1 expression have been reported to be 34.3% in tumor cells and 51.4% in ICs in endometrial cancer [47], 18.7% in tumor cells and 51.2% in ICs in breast cancer [48], and 26% in tumor cells in small-cell lung cancer [15]. The gene discussed is CD274; the disease is small cell lung carcinoma.