The average sPD-L1 level in GC patients was higher than that in NSCLC patients (693 ± 2668 and 125 ± 837 pg/mL, respectively), while the average bsPD-L1 level in NSCLC patients was higher than that in GC patients (2237 ± 7,960 and 216 ± 823 pg/mL, respectively). Here, SPDL1 is linked to gastric cancer.