OTUB1 and gastric cancer: Since OTUB1‐isoform2 exists as a ncRNA in somatic organs except in the lymphatic tissues (https://www.ncbi.nlm.nih.gov/nuccore/NR_003089.1)%5b2020, and our previous study has also confirmed its existence as a ncRNA in gastric cancer,27 we first determined the level of OTUB1‐isoform2 mRNA using RT‐qPCR with the specific primers.