Table 1 summarizes the staining scores of PKC-δ in oral squamous cell carcinoma tissues. Higher levels of PKC-δ expression were found in stage III–IV than stage I–II of oral squamous cell carcinoma (p < 0.02). In addition, cases with lymph node metastasis showed increased PKC-δ expression than lymph node metastasis-negative cases (p < 0.001). Moreover, the expression of PKC-δ was not associated with stage, age, location of tumor and sex (Table 2). The gene discussed is PRKCD; the disease is oral cavity squamous cell carcinoma.