“…The P4HB (also known as PDIA1) and PDIA4, which were chosen from the six-gene signature, belong to the protein PDI protein family and have been proved to be related to ER stress activation in human cancers (Joo et al, 2007;Kranz et al, 2017;Winship et al, 2017;Liu et al, 2019;Wang et al, 2020), especially the PERK signaling pathway (Kranz et al, 2017(Kranz et al, , 2020. Serval recent researches has pointed out that P4HB and PDIA4 correlated with the malignant progression of glioma, but these conclusions have not been sufficiently verified by in vitro experiments (Zou et al, 2018;Li et al, 2021). Besides, the P4HB and PDIA4, which have significant prognostic value in gliomas, were also the important components of the ER stress-related signature.…”