FADD and head and neck squamous cell carcinoma: The results of our meta-analysis carried out on 13 studies/1923 patients demonstrate the relevance of immunohistochemical FADD overexpression as a marker of poor survival in HNSCC patients, referring to OS (HR = 1.52, 95% CI = 1.28–1.81, p < 0.001), DSS (HR = 2.52, 95% CI = 1.61–3.96, p < 0.001) and DFS (HR = 1.67, 95% CI = 1.29–2.15, p < 0.001).