The respective associations between HDAC-2 and HDAC-5 (nuclear or cytoplasmic) and OS in the entire cohort as well as in serous tumors or serous carcinomas were not significant (log-rank test, for the entire cohort; HDAC-2 p = 0.78, nuclear HDAC-5 p = 0.324, cytoplasmic HDAC-5 p = 0.96, for serous tumors; HDAC-2 p = 0.834, nuclear HDAC-5 p = 0.509, cytoplasmic HDAC-5 p = 0.969). Here, HDAC5 is linked to serous adenocarcinoma.