CD274 and endometriosis: Correspondingly, patients from the stage I and II endometriosis group (1.98 ± 1.67%, median 1.17%, Min–Max 0.52–6.97%) and stage III and IV endometriosis group (2.06 ± 1.55%, median 1.79%, Min–Max 0.66–5.34%) had higher frequencies of CD8+/PD-L1+ T cells than healthy individuals (0.45 ± 0.11%, median 0.43%, Min–Max 0.31–0.67%) (Figure 2(e)).