A similar association was observed regarding tumor T-status, especially in the subset of serous carcinomas, where all T1 cases were positive for HDAC-4 compared with 23.6% of the T2/T3 cases (Chi-square test, p = 0.043), whereas the respective relationship was of marginal significance in tumors with serous histology (borderline and carcinomas, p = 0.078) and failed to attain statistical significance when the analysis was performed on the entire cohort (p = 0.353). Here, HDAC4 is linked to serous adenocarcinoma.