PDCD1LG2 and glioblastoma: Eight prognosis-related cancers, namely, CESC, SKCM, GBM, LGG, GBMLGG, KIRC, PRAD, and UVM, are highly positively correlated with at least 36 of 46 immune checkpoints such as CD200 receptor 1, CD86, and programmed cell death 1 ligand 2 (PCD1LG2).