OTUB1 and ovarian cancer: However, our previous study found that OTUB1‐isoform2 was up‐regulated in gastric cancer and exerted oncogenic functions27, just like its isoform OTUB1.25 Therefore, it remains elusive whether OTUB1‐isoform2 is implicated in ovarian cancer, and if so, what kind of role it plays in the progression of ovarian cancer.