PDCD1LG2 and Hodgkins lymphoma: Similarly, the mean concentration of PDCD1LG2 was 32.35 ± 22.40 ng/mL in the HH group and 20.14 ± 14.39 ng/mL in the HL group (p = 0.02), indicating that PDCD1LG2 was also expressed at significantly higher levels in the HH group.