PDCD1LG2 and cancer: The optimal cutpoints for dichotomization between high and low PD-L2 expression were very similar for the cancer cells (immunofluorescence level = 8.33; 95% CI, 8.05 to 8.44) and stromal cells (immunofluorescence level = 8.16; 95% CI, 7.48 to 8.71).