Using the SK-UT-1 leiomyosarcoma cells as a human cell line control and NIH-3T3 cells as a murine cell line control, we show that ICR-SS-1 only expressed the human and not the murine version of PTGER2 (Figure 2B), confirming that this cell line is comprised of a pure population of human cells. Here, PTGER2 is linked to leiomyosarcoma.